Packet switching

<h2 id="concept">Concept</h2>

A simple definition of packet switching is:

<blockquote>The <a href="/facts/Routing/Ml6MVCaC">routing</a> and transferring of data by means of addressed packets so that a <a href="/facts/Communication_channel/MtlxEShV">channel</a> is occupied during the <a href="/facts/Transmission_(telecommunications)/33zk8a0A">transmission</a> of the packet only, and upon completion of the transmission the channel is made available for the transfer of other <a href="/facts/Network_traffic/sdUtmrxM">traffic</a>.<a class="footnote-ref" id="fnref:1" href="#fn:1">1</a><a class="footnote-ref" id="fnref:2" href="#fn:2">2</a></blockquote>
Packet switching allows delivery of <a href="/facts/Variable_bit_rate/RrRLn4dl">variable bit rate</a> data streams, realized as sequences of short messages in fixed format, i.e. <a href="/facts/Network_packet/xCYf8SJu">packets</a>, over a <a href="/facts/Computer_network/3w5RM99p">computer network</a> which allocates transmission resources as needed using <a href="/facts/Statistical_multiplexing/rLGcaGHV">statistical multiplexing</a> or <a href="/facts/Dynamic_bandwidth_allocation/a9t97IU9">dynamic bandwidth allocation</a> techniques. As they traverse <a href="/facts/Networking_hardware/ck0rIkXA">networking hardware</a>, such as switches and <a href="/facts/Router_(computing)/Nh5cIyVf">routers</a>, packets are received, buffered, queued, and retransmitted (<a href="/facts/Store_and_forward/zwM8Amlv">stored and forwarded</a>), resulting in variable latency and <a href="/facts/Throughput/6zAUsXqw">throughput</a> depending on the link capacity and the traffic load on the network. Packets are normally forwarded by intermediate network nodes asynchronously using <a href="/facts/First-in%2c_first-out/RctvBNgE">first-in, first-out</a> buffering, but may be forwarded according to some scheduling discipline for <a href="/facts/Fair_queuing/hwv3AIud">fair queuing</a>, <a href="/facts/Traffic_shaping/VCF0Gb3b">traffic shaping</a>, or for differentiated or guaranteed <a href="/facts/Quality_of_service/joz9VkUm">quality of service</a>, such as <a href="/facts/Weighted_fair_queuing/DU2FCx3p">weighted fair queuing</a> or <a href="/facts/Leaky_bucket/71XC0C1Y">leaky bucket</a>. Packet-based communication may be implemented with or without intermediate forwarding nodes (switches and routers). In case of a shared physical medium (such as radio or <a href="/facts/10BASE5/vxgB15fH">10BASE5</a>), the packets may be delivered according to a <a href="/facts/Multiple_access/CdCGxpcu">multiple access</a> scheme.
Packet switching contrasts with another principal networking paradigm, <a href="/facts/Circuit_switching/fJ3vdmAB">circuit switching</a>, a method which pre-allocates dedicated network bandwidth specifically for each communication session, each having a constant bit rate and latency between nodes. In cases of billable services, such as <a href="/facts/Cellular_communication/H3EcqD9h">cellular communication</a> services, circuit switching is characterized by a fee per unit of connection time, even when no data is transferred, while packet switching may be characterized by a fee per unit of information transmitted, such as characters, packets, or messages.
A packet switch has four components: input ports, output ports, routing processor, and switching fabric.<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a>

<h2 id="history">History</h2>
Further information: <a href="/facts/History_of_the_Internet/frRuaPrU">History of the Internet</a> and <a href="/facts/Protocol_Wars/G255zc48">Protocol Wars</a>
See also: <a href="/facts/Datagram/TMHVctMz">Datagram § History</a>
<h3>Invention and development</h3>

The concept of switching small blocks of data was first explored independently by <a href="/facts/Paul_Baran/uVUe5PPB">Paul Baran</a> at the <a href="/facts/RAND_Corporation/zArfRxf9">RAND Corporation</a> during the early 1960s in the US and <a href="/facts/Donald_Davies/zHGN8LXl">Donald Davies</a> at the <a href="/facts/National_Physical_Laboratory_(United_Kingdom)/NM5HzE0b">National Physical Laboratory</a> (NPL) in the UK in 1965.<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a><a class="footnote-ref" id="fnref:5" href="#fn:5">5</a><a class="footnote-ref" id="fnref:6" href="#fn:6">6</a><a class="footnote-ref" id="fnref:7" href="#fn:7">7</a>
In the late 1950s, the <a href="/facts/US_Air_Force/7MxWBYlc">US Air Force</a> established a <a href="/facts/Wide_area_network/mAkW4gr3">wide area network</a> for the <a href="/facts/Semi-Automatic_Ground_Environment/qAPVULus">Semi-Automatic Ground Environment</a> (SAGE) radar defense system. Recognizing vulnerabilities in this network, the Air Force sought a system that might survive a <a href="/facts/Nuclear_attack/HLRLRh4F">nuclear attack</a> to enable a response, thus diminishing the attractiveness of the first strike advantage by enemies (see <a href="/facts/Mutual_assured_destruction/ImetP5jV">Mutual assured destruction</a>).<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a> In the early 1960s, Baran invented the concept of distributed adaptive message block switching in support of the Air Force initiative.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a><a class="footnote-ref" id="fnref:10" href="#fn:10">10</a> The concept was first presented to the Air Force in the summer of 1961 as briefing B-265,<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> later published as RAND report P-2626 in 1962,<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> and finally in report RM 3420 in 1964.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a> The reports describe a general architecture for a large-scale, distributed, survivable communications network. The proposal was composed of three key ideas: use of a <a href="/facts/Decentralized/5koMXAUs">decentralized</a> network with multiple paths between any two points; dividing user messages into message blocks; and delivery of these messages by <a href="/facts/Store_and_forward/zwM8Amlv">store and forward</a> switching.<a class="footnote-ref" id="fnref:14" href="#fn:14">14</a><a class="footnote-ref" id="fnref:15" href="#fn:15">15</a> Baran's network design was focused on <a href="/facts/Digital_communication/1yAhaANd">digital communication</a> of voice messages using switches that were low-cost electronics.<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a><a class="footnote-ref" id="fnref:17" href="#fn:17">17</a><a class="footnote-ref" id="fnref:18" href="#fn:18">18</a>
<a href="/facts/Christopher_Strachey/hx9ToYVY">Christopher Strachey</a>, who became <a href="/facts/University_of_Oxford/ExVVQL6V">Oxford University's</a> first Professor of Computation, filed a <a href="/facts/Patent_application/ACHxPn3A">patent application</a> in the United Kingdom for <a href="/facts/Time-sharing/LE5XT9Go">time-sharing</a> in February 1959.<a class="footnote-ref" id="fnref:19" href="#fn:19">19</a><a class="footnote-ref" id="fnref:20" href="#fn:20">20</a> In June that year, he gave a paper "Time Sharing in Large Fast Computers" at the <a href="/facts/International_Federation_for_Information_Processing/RgTMBVN9">UNESCO Information Processing Conference</a> in Paris where he passed the concept on to <a href="/facts/J._C._R._Licklider/QaL9FHPp">J. C. R. Licklider</a>.<a class="footnote-ref" id="fnref:21" href="#fn:21">21</a><a class="footnote-ref" id="fnref:22" href="#fn:22">22</a> Licklider (along with <a href="/facts/John_McCarthy_(computer_scientist)/ajKU4SdD">John McCarthy</a>) was instrumental in the development of time-sharing. After conversations with Licklider about time-sharing with remote computers in 1965,<a class="footnote-ref" id="fnref:23" href="#fn:23">23</a><a class="footnote-ref" id="fnref:24" href="#fn:24">24</a> Davies independently invented a similar <a href="/facts/Data_communication/1yAhaANd">data communication</a> concept,<a class="footnote-ref" id="fnref:25" href="#fn:25">25</a> using short messages in fixed format with high data transmission rates to achieve rapid communications.<a class="footnote-ref" id="fnref:26" href="#fn:26">26</a> He went on to develop a more advanced design for a hierarchical, high-speed <a href="/facts/Computer_network/3w5RM99p">computer network</a> including <a href="/facts/Router_(computing)/Nh5cIyVf">interface computers</a> and <a href="/facts/Communication_protocol/5uady7cB">communication protocols</a>.<a class="footnote-ref" id="fnref:27" href="#fn:27">27</a><a class="footnote-ref" id="fnref:28" href="#fn:28">28</a><a class="footnote-ref" id="fnref:29" href="#fn:29">29</a> He coined the term packet switching, and proposed building a commercial nationwide data network in the UK.<a class="footnote-ref" id="fnref:30" href="#fn:30">30</a><a class="footnote-ref" id="fnref:31" href="#fn:31">31</a> He gave a talk on the proposal in 1966, after which a person from the <a href="/facts/Ministry_of_Defence_(United_Kingdom)/9TG9a0ss">Ministry of Defence</a> (MoD) told him about Baran's work.<a class="footnote-ref" id="fnref:32" href="#fn:32">32</a> 
<a href="/facts/Roger_Scantlebury/SFtHHRKb">Roger Scantlebury</a>, a member of Davies' team, presented their work (and referenced that of Baran) at the October 1967 <a href="/facts/Symposium_on_Operating_Systems_Principles/VhguUHDg">Symposium on Operating Systems Principles</a> (SOSP).<a class="footnote-ref" id="fnref:33" href="#fn:33">33</a><a class="footnote-ref" id="fnref:34" href="#fn:34">34</a><a class="footnote-ref" id="fnref:35" href="#fn:35">35</a><a class="footnote-ref" id="fnref:36" href="#fn:36">36</a><a class="footnote-ref" id="fnref:37" href="#fn:37">37</a> At the conference, Scantlebury proposed packet switching for use in the <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a> and persuaded <a href="/facts/Lawrence_Roberts_(scientist)/WoY2CXUr">Larry Roberts</a> the economics were favorable to <a href="/facts/Message_switching/Jro8I31X">message switching</a>.<a class="footnote-ref" id="fnref:38" href="#fn:38">38</a><a class="footnote-ref" id="fnref:39" href="#fn:39">39</a><a class="footnote-ref" id="fnref:40" href="#fn:40">40</a><a class="footnote-ref" id="fnref:41" href="#fn:41">41</a><a class="footnote-ref" id="fnref:42" href="#fn:42">42</a><a class="footnote-ref" id="fnref:43" href="#fn:43">43</a> Davies had chosen some of the same parameters for his original network design as did Baran, such as a packet size of 1024 bits. To deal with packet permutations (due to dynamically updated route preferences) and <a href="/facts/Datagram/TMHVctMz">datagram</a> losses (unavoidable when fast sources send to a slow destinations), he assumed that "all users of the network will provide themselves with some kind of error control",<a class="footnote-ref" id="fnref:44" href="#fn:44">44</a> thus inventing what came to be known as the <a href="/facts/End-to-end_principle/6RkKmdUm">end-to-end principle</a>. Davies proposed that a local-area network should be built at the laboratory to serve the needs of NPL and prove the feasibility of packet switching. After a <a href="/facts/Pilot_experiment/MlAyYHnP">pilot experiment</a> in early 1969,<a class="footnote-ref" id="fnref:45" href="#fn:45">45</a><a class="footnote-ref" id="fnref:46" href="#fn:46">46</a><a class="footnote-ref" id="fnref:47" href="#fn:47">47</a><a class="footnote-ref" id="fnref:48" href="#fn:48">48</a> the <a href="/facts/NPL_Data_Communications_Network/JWc0pxUu">NPL Data Communications Network</a> began service in 1970.<a class="footnote-ref" id="fnref:49" href="#fn:49">49</a> Davies was invited to Japan to give a series of lectures on packet switching.<a class="footnote-ref" id="fnref:50" href="#fn:50">50</a> The NPL team carried out <a href="/facts/Simulation/Q4QJV1oI">simulation</a> work on datagrams and <a href="/facts/Network_congestion/9ohkRMso">congestion</a> in networks on a scale to provide data communication across the United Kingdom.<a class="footnote-ref" id="fnref:51" href="#fn:51">51</a><a class="footnote-ref" id="fnref:52" href="#fn:52">52</a><a class="footnote-ref" id="fnref:53" href="#fn:53">53</a><a class="footnote-ref" id="fnref:54" href="#fn:54">54</a><a class="footnote-ref" id="fnref:55" href="#fn:55">55</a>
<a href="/facts/Lawrence_Roberts_(scientist)/WoY2CXUr">Larry Roberts</a> made the key decisions in the <a href="/facts/Request_for_proposal/rneQaVvs">request for proposal</a> to build the <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a>.<a class="footnote-ref" id="fnref:56" href="#fn:56">56</a> Roberts met Baran in February 1967, but did not discuss networks.<a class="footnote-ref" id="fnref:57" href="#fn:57">57</a><a class="footnote-ref" id="fnref:58" href="#fn:58">58</a> He asked <a href="/facts/Frank_Westervelt/QbdWmftQ">Frank Westervelt</a> to explore the questions of message size and contents for the network, and to write a position paper on the intercomputer communication protocol including “conventions for character and block transmission, error checking and re transmission, and computer and user identification."<a class="footnote-ref" id="fnref:59" href="#fn:59">59</a> Roberts revised his initial design, which was to connect the <a href="/facts/Host_computer/HPNcFXHk">host computers</a> directly, to incorporate <a href="/facts/Wesley_A._Clark/CpwgrHKm">Wesley Clark's</a> idea to use <a href="/facts/Interface_Message_Processor/NNUx01pg">Interface Message Processors</a> (IMPs) to create a <a href="/facts/Message_switching/Jro8I31X">message switching</a> network, which he presented at SOSP.<a class="footnote-ref" id="fnref:60" href="#fn:60">60</a><a class="footnote-ref" id="fnref:61" href="#fn:61">61</a><a class="footnote-ref" id="fnref:62" href="#fn:62">62</a><a class="footnote-ref" id="fnref:63" href="#fn:63">63</a> Roberts was known for making decisions quickly.<a class="footnote-ref" id="fnref:64" href="#fn:64">64</a> Immediately after SOSP, he incorporated Davies' and Baran's concepts and designs for packet switching to enable the data communications on the network.<a class="footnote-ref" id="fnref:65" href="#fn:65">65</a><a class="footnote-ref" id="fnref:66" href="#fn:66">66</a><a class="footnote-ref" id="fnref:67" href="#fn:67">67</a><a class="footnote-ref" id="fnref:68" href="#fn:68">68</a>
A contemporary of Roberts' from <a href="/facts/MIT/Xk49vNA8">MIT</a>, <a href="/facts/Leonard_Kleinrock/oj6b357M">Leonard Kleinrock</a> had researched the application of <a href="/facts/Queueing_theory/8NDl56EM">queueing theory</a> in the field of <a href="/facts/Message_switching/Jro8I31X">message switching</a> for his doctoral dissertation in 1961–62 and published it as a book in 1964.<a class="footnote-ref" id="fnref:69" href="#fn:69">69</a> Davies, in his 1966 paper on packet switching,<a class="footnote-ref" id="fnref:70" href="#fn:70">70</a> applied Kleinorck's techniques to show that "there is an ample margin between the estimated performance of the [packet-switched] system and the stated requirement" in terms of a satisfactory <a href="/facts/Response_time_(telecommunications)/jYgNMK98">response time</a> for a human user.<a class="footnote-ref" id="fnref:71" href="#fn:71">71</a> This addressed a key question about the viability of computer networking.<a class="footnote-ref" id="fnref:72" href="#fn:72">72</a> Larry Roberts brought Kleinrock into the ARPANET project informally in early 1967.<a class="footnote-ref" id="fnref:73" href="#fn:73">73</a> Roberts and Taylor recognized the issue of response time was important, but did not apply Kleinrock's methods to assess this and based their design on a <a href="/facts/Store-and-forward/zwM8Amlv">store-and-forward</a> system that was not intended for <a href="/facts/Real-time_computing/p9HxgL4L">real-time computing</a>.<a class="footnote-ref" id="fnref:74" href="#fn:74">74</a> After SOSP, and after Roberts' direction to use packet switching,<a class="footnote-ref" id="fnref:75" href="#fn:75">75</a> Kleinrock sought input from Baran and proposed to retain Baran and RAND as advisors.<a class="footnote-ref" id="fnref:76" href="#fn:76">76</a><a class="footnote-ref" id="fnref:77" href="#fn:77">77</a><a class="footnote-ref" id="fnref:78" href="#fn:78">78</a> The ARPANET working group assigned Kleinrock responsibility to prepare a report on software for the IMP.<a class="footnote-ref" id="fnref:79" href="#fn:79">79</a> In 1968, Roberts awarded Kleinrock a contract to establish a Network Measurement Center (NMC) at <a href="/facts/UCLA/KwPz7AK1">UCLA</a> to measure and model the performance of packet switching in the ARPANET.<a class="footnote-ref" id="fnref:80" href="#fn:80">80</a> 
<a href="/facts/Bolt_Beranek_%2526_Newman/9kA7axL3">Bolt Beranek & Newman</a> (BBN) won the contract to build the network. Designed principally by <a href="/facts/Bob_Kahn/wooNfB4v">Bob Kahn</a>,<a class="footnote-ref" id="fnref:81" href="#fn:81">81</a><a class="footnote-ref" id="fnref:82" href="#fn:82">82</a> it was the first wide-area packet-switched network with distributed control.<a class="footnote-ref" id="fnref:83" href="#fn:83">83</a> The BBN "IMP Guys" independently developed significant aspects of the network's internal operation, including the routing algorithm, flow control, software design, and network control.<a class="footnote-ref" id="fnref:84" href="#fn:84">84</a><a class="footnote-ref" id="fnref:85" href="#fn:85">85</a> The UCLA NMC and the BBN team also investigated network congestion.<a class="footnote-ref" id="fnref:86" href="#fn:86">86</a><a class="footnote-ref" id="fnref:87" href="#fn:87">87</a> The Network Working Group, led by <a href="/facts/Steve_Crocker/Wf71Ah7k">Steve Crocker</a>, a graduate student of Kleinrock's at UCLA, developed the host-to-host protocol, the <a href="/facts/Network_Control_Program_(ARPANET)/tFDR3I41">Network Control Program</a>, which was approved by Barry Wessler for ARPA,<a class="footnote-ref" id="fnref:88" href="#fn:88">88</a> after he ordered certain more exotic elements to be dropped.<a class="footnote-ref" id="fnref:89" href="#fn:89">89</a> In 1970, Kleinrock extended his earlier <a href="/facts/Analytics/JWD5D9cM">analytic</a> work on message switching to packet switching in the ARPANET.<a class="footnote-ref" id="fnref:90" href="#fn:90">90</a> His work influenced the development of the ARPANET and packet-switched networks generally.<a class="footnote-ref" id="fnref:91" href="#fn:91">91</a><a class="footnote-ref" id="fnref:92" href="#fn:92">92</a><a class="footnote-ref" id="fnref:93" href="#fn:93">93</a> 
The ARPANET was demonstrated at the <a href="/facts/International_Conference_on_Computer_Communications/7NMW2eHh">International Conference on Computer Communication</a> (ICCC) in Washington in October 1972.<a class="footnote-ref" id="fnref:94" href="#fn:94">94</a><a class="footnote-ref" id="fnref:95" href="#fn:95">95</a> However, fundamental questions about the design of packet-switched networks remained.<a class="footnote-ref" id="fnref:96" href="#fn:96">96</a><a class="footnote-ref" id="fnref:97" href="#fn:97">97</a><a class="footnote-ref" id="fnref:98" href="#fn:98">98</a>
Roberts presented the idea of packet switching to communication industry professionals in the early 1970s. Before ARPANET was operating, they argued that the router buffers would quickly run out. After the ARPANET was operating, they argued packet switching would never be economic without the government subsidy. Baran had faced the same rejection and thus failed to convince the military into constructing a packet switching network in the 1960s.<a class="footnote-ref" id="fnref:99" href="#fn:99">99</a>
The <a href="/facts/CYCLADES/kJX66P6D">CYCLADES</a> network was designed by <a href="/facts/Louis_Pouzin/3xeGwxzy">Louis Pouzin</a> in the early 1970s to study <a href="/facts/Internetworking/sCyckA2T">internetworking</a>.<a class="footnote-ref" id="fnref:100" href="#fn:100">100</a><a class="footnote-ref" id="fnref:101" href="#fn:101">101</a><a class="footnote-ref" id="fnref:102" href="#fn:102">102</a> It was the first to implement the end-to-end principle of Davies, and make the host computers responsible for the reliable delivery of data on a packet-switched network, rather than this being a service of the network itself.<a class="footnote-ref" id="fnref:103" href="#fn:103">103</a> His team was thus first to tackle the highly-complex problem of providing user applications with a reliable <a href="/facts/Virtual_circuit/8HqpnTxl">virtual circuit</a> service while using a <a href="/facts/Best-effort_service/W0JBRbtH">best-effort service</a>, an early contribution to what will be the <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">Transmission Control Protocol</a> (TCP).<a class="footnote-ref" id="fnref:104" href="#fn:104">104</a>
<a href="/facts/Bob_Metcalfe/qevKUjPd">Bob Metcalfe</a> and others at <a href="/facts/Xerox_PARC/fh2Su0k9">Xerox PARC</a> outlined the idea of <a href="/facts/Ethernet/nMfhU8tU">Ethernet</a> and the <a href="/facts/PARC_Universal_Packet/ub0fExbh">PARC Universal Packet</a> (PUP) for internetworking.<a class="footnote-ref" id="fnref:105" href="#fn:105">105</a>
In May 1974, <a href="/facts/Vint_Cerf/lo7mnfHt">Vint Cerf</a> and <a href="/facts/Bob_Kahn/wooNfB4v">Bob Kahn</a> described the <a href="/facts/Transmission_Control_Program/Qq6VeEal">Transmission Control Program</a>, an internetworking <a href="/facts/Communication_protocol/5uady7cB">protocol</a> for sharing resources using packet-switching among the nodes.<a class="footnote-ref" id="fnref:106" href="#fn:106">106</a> The specifications of the TCP were then published in <a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc675">675</a> (Specification of Internet Transmission Control Program), written by Vint Cerf, <a href="/facts/Yogen_Dalal/0d1bt83h">Yogen Dalal</a> and Carl Sunshine in December 1974.<a class="footnote-ref" id="fnref:107" href="#fn:107">107</a> 
The <a href="/facts/X.25/yaGPqw2Y">X.25 protocol</a>, developed by <a href="/facts/R%25C3%25A9mi_Despr%25C3%25A9s/szTyWDxc">Rémi Després</a> and others, was built on the concept of <a href="/facts/Virtual_circuit/8HqpnTxl">virtual circuits</a>. In the mid-late 1970s and early 1980s, national and international <a href="/facts/Public_data_network/sMYs1t3f">public data networks</a> emerged using X.25 which was developed with participation from France, the UK, Japan, USA and Canada. It was complemented with <a href="/facts/X.75/8xsJKxro">X.75</a> to enable internetworking.<a class="footnote-ref" id="fnref:108" href="#fn:108">108</a> 
Packet switching was shown to be optimal in the <a href="/facts/Huffman_coding/dBgMBz48">Huffman coding</a> sense in 1978.<a class="footnote-ref" id="fnref:109" href="#fn:109">109</a><a class="footnote-ref" id="fnref:110" href="#fn:110">110</a> 
In the late 1970s, the monolithic Transmission Control Program was layered as the Transmission Control Protocol (TCP), atop the <a href="/facts/Internet_Protocol/Qq6VeEal">Internet Protocol</a> (IP). Many <a href="/facts/Internet_pioneers/0d1bt83h">Internet pioneers</a> developed this into the <a href="/facts/Internet_protocol_suite/KNkxtSpw">Internet protocol suite</a> and the associated Internet architecture and governance that emerged in the 1980s.<a class="footnote-ref" id="fnref:111" href="#fn:111">111</a><a class="footnote-ref" id="fnref:112" href="#fn:112">112</a><a class="footnote-ref" id="fnref:113" href="#fn:113">113</a><a class="footnote-ref" id="fnref:114" href="#fn:114">114</a><a class="footnote-ref" id="fnref:115" href="#fn:115">115</a><a class="footnote-ref" id="fnref:116" href="#fn:116">116</a>
For a period in the 1980s and early 1990s, the network engineering community was polarized over the implementation of competing protocol suites, commonly known as the <a href="/facts/Protocol_Wars/G255zc48">Protocol Wars</a>. It was unclear which of the Internet protocol suite and the <a href="/facts/OSI_model/oxN9Xhjz">OSI model</a> would result in the best and most robust computer networks.<a class="footnote-ref" id="fnref:117" href="#fn:117">117</a><a class="footnote-ref" id="fnref:118" href="#fn:118">118</a><a class="footnote-ref" id="fnref:119" href="#fn:119">119</a>
Leonard Kleinrock carried out theoretical work at UCLA during the 1970s analyzing throughput and delay in the ARPANET.<a class="footnote-ref" id="fnref:120" href="#fn:120">120</a><a class="footnote-ref" id="fnref:121" href="#fn:121">121</a><a class="footnote-ref" id="fnref:122" href="#fn:122">122</a> His theoretical work on <a href="/facts/Hierarchical_routing/b0mCqsXA">hierarchical routing</a> with student <a href="/facts/Farouk_Kamoun/NKs7uV9K">Farouk Kamoun</a> became critical to the operation of the Internet.<a class="footnote-ref" id="fnref:123" href="#fn:123">123</a><a class="footnote-ref" id="fnref:124" href="#fn:124">124</a> Kleinrock published hundreds of research papers,<a class="footnote-ref" id="fnref:125" href="#fn:125">125</a><a class="footnote-ref" id="fnref:126" href="#fn:126">126</a> which ultimately launched a new field of research on the theory and application of queuing theory to computer networks.<a class="footnote-ref" id="fnref:127" href="#fn:127">127</a><a class="footnote-ref" id="fnref:128" href="#fn:128">128</a>
Complementary <a href="/facts/Metal%25E2%2580%2593oxide%25E2%2580%2593semiconductor/eTDJT2Km">metal–oxide–semiconductor</a> (<a href="/facts/CMOS/NJIWYgBl">CMOS</a>) <a href="/facts/VLSI/l1Wgqr27">VLSI</a> (very-<a href="/facts/Large-scale_integration/fjn6vg7C">large-scale integration</a>) technology led to the development of high-speed <a href="/facts/Broadband/nEn3A95N">broadband</a> packet switching during the 1980s–1990s.<a class="footnote-ref" id="fnref:129" href="#fn:129">129</a><a class="footnote-ref" id="fnref:130" href="#fn:130">130</a><a class="footnote-ref" id="fnref:131" href="#fn:131">131</a>

<h3>The "paternity dispute"</h3>
Roberts claimed in later years that, by the time of the October 1967 SOSP, he already had the concept of packet switching in mind (although not yet named and not written down in his paper published at the conference, which a number of sources describe as "vague"), and that this originated with his old colleague, Kleinrock, who had written about such concepts in his Ph.D. research in 1961-2.<a class="footnote-ref" id="fnref:132" href="#fn:132">132</a><a class="footnote-ref" id="fnref:133" href="#fn:133">133</a><a class="footnote-ref" id="fnref:134" href="#fn:134">134</a><a class="footnote-ref" id="fnref:135" href="#fn:135">135</a><a class="footnote-ref" id="fnref:136" href="#fn:136">136</a> In 1997, along with seven other <a href="/facts/Internet_pioneers/0d1bt83h">Internet pioneers</a>, Roberts and Kleinrock co-wrote "Brief History of the Internet" published by the <a href="/facts/Internet_Society/scIaot5x">Internet Society</a>.<a class="footnote-ref" id="fnref:137" href="#fn:137">137</a> In it, Kleinrock is described as having "published the first paper on packet switching theory in July 1961 and the first book on the subject in 1964". Many sources about the history of the Internet began to reflect these claims as uncontroversial facts. This became the subject of what <a href="/facts/Katie_Hafner/1tfSAFEl">Katie Hafner</a> called a "paternity dispute" in The New York Times in 2001.<a class="footnote-ref" id="fnref:138" href="#fn:138">138</a>
The disagreement about Kleinrock's contribution to packet switching dates back to a version of the above claim made on Kleinrock's profile on the UCLA Computer Science department website sometime in the 1990s. Here, he was referred to as the "Inventor of the Internet Technology".<a class="footnote-ref" id="fnref:139" href="#fn:139">139</a> The webpage's depictions of Kleinrock's achievements provoked anger among some early Internet pioneers.<a class="footnote-ref" id="fnref:140" href="#fn:140">140</a> The dispute over <a href="/facts/Scientific_priority/3eTT84qX">priority</a> became a public issue after Donald Davies posthumously published a paper in 2001 in which he denied that Kleinrock's work was related to packet switching. Davies also described ARPANET project manager <a href="/facts/Lawrence_Roberts_(scientist)/WoY2CXUr">Larry Roberts</a> as supporting Kleinrock, referring to Roberts' writings online and Kleinrock's UCLA webpage profile as "very misleading".<a class="footnote-ref" id="fnref:141" href="#fn:141">141</a><a class="footnote-ref" id="fnref:142" href="#fn:142">142</a> <a href="/facts/Walter_Isaacson/hE0jeb5n">Walter Isaacson</a> wrote that Kleinrock's claims "led to an outcry among many of the other Internet pioneers, who publicly attacked Kleinrock and said that his brief mention of breaking messages into smaller pieces did not come close to being a proposal for packet switching".<a class="footnote-ref" id="fnref:143" href="#fn:143">143</a> 
Davies' paper reignited a previous dispute over who deserves credit for getting the ARPANET online between engineers at <a href="/facts/Bolt%2c_Beranek%2c_and_Newman/9kA7axL3">Bolt, Beranek, and Newman</a> (BBN) who had been involved in building and designing the ARPANET IMP on the one side, and ARPA-related researchers on the other.<a class="footnote-ref" id="fnref:144" href="#fn:144">144</a><a class="footnote-ref" id="fnref:145" href="#fn:145">145</a> This earlier dispute is exemplified by BBN's <a href="/facts/Will_Crowther/bDVMG9Pv">Will Crowther</a>, who in a 1990 oral history described Paul Baran's packet switching design (which he called <a href="/facts/Hot-potato_routing/t47xSyBk">hot-potato routing</a>), as "crazy" and non-sensical, despite the ARPA team having advocated for it.<a class="footnote-ref" id="fnref:146" href="#fn:146">146</a> The reignited debate caused other former BBN employees to make their concerns known, including Alex McKenzie, who followed Davies in disputing that Kleinrock's work was related to packet switching, stating "... there is nothing in the entire 1964 book that suggests, analyzes, or alludes to the idea of packetization".<a class="footnote-ref" id="fnref:147" href="#fn:147">147</a>
Former <a href="/facts/Information_Processing_Techniques_Office/cS046VN9">IPTO</a> director <a href="/facts/Robert_W._Taylor/9j2e6WkT">Bob Taylor</a> also joined the debate, stating that "authors who have interviewed dozens of Arpanet pioneers know very well that the Kleinrock-Roberts claims are not believed".<a class="footnote-ref" id="fnref:148" href="#fn:148">148</a> Walter Isaacson notes that "until the mid-1990s Kleinrock had credited [Baran and Davies] with coming up with the idea of packet switching".<a class="footnote-ref" id="fnref:149" href="#fn:149">149</a>
A subsequent version of Kleinrock's biography webpage was copyrighted in 2009 by Kleinrock.<a class="footnote-ref" id="fnref:150" href="#fn:150">150</a> He was called on to defend his position over subsequent decades.<a class="footnote-ref" id="fnref:151" href="#fn:151">151</a> In 2023, he acknowledged that his published work in the early 1960s was about message switching and claimed he was thinking about packet switching.<a class="footnote-ref" id="fnref:152" href="#fn:152">152</a> Primary sources and historians recognize Baran and Davies for independently inventing the concept of digital packet switching used in modern computer networking including the ARPANET and the Internet.<a class="footnote-ref" id="fnref:153" href="#fn:153">153</a><a class="footnote-ref" id="fnref:154" href="#fn:154">154</a><a class="footnote-ref" id="fnref:155" href="#fn:155">155</a><a class="footnote-ref" id="fnref:156" href="#fn:156">156</a><a class="footnote-ref" id="fnref:157" href="#fn:157">157</a>
Kleinrock has received many awards for his ground-breaking <a href="/facts/Applied_mathematical_research/qyqklXXm">applied mathematical research</a> on packet switching, carried out in the 1970s, which was an extension of his pioneering work in the early 1960s on the optimization of message delays in communication networks.<a class="footnote-ref" id="fnref:158" href="#fn:158">158</a><a class="footnote-ref" id="fnref:159" href="#fn:159">159</a> However, Kleinrock's claims that his work in the early 1960s originated the concept of packet switching and that his work was a source of the packet switching concepts used in the ARPANET have affected sources on the topic, which has created methodological challenges in the historiography of the Internet.<a class="footnote-ref" id="fnref:160" href="#fn:160">160</a><a class="footnote-ref" id="fnref:161" href="#fn:161">161</a><a class="footnote-ref" id="fnref:162" href="#fn:162">162</a><a class="footnote-ref" id="fnref:163" href="#fn:163">163</a> Historian Andrew L. Russell said "'Internet history' also suffers from a ... methodological, problem: it tends to be too close to its sources. Many Internet pioneers are alive, active, and eager to shape the histories that describe their accomplishments. Many museums and historians are equally eager to interview the pioneers and to publicize their stories".<a class="footnote-ref" id="fnref:164" href="#fn:164">164</a>

<h2 id="connectionless-and-connection-oriented-modes">Connectionless and connection-oriented modes</h2>
Packet switching may be classified into <a href="/facts/Connectionless/MfMys8t7">connectionless</a> packet switching, also known as <a href="/facts/Datagram/TMHVctMz">datagram</a> switching, and <a href="/facts/Connection-oriented/2yAhgueh">connection-oriented</a> packet switching, also known as <a href="/facts/Virtual_circuit/8HqpnTxl">virtual circuit</a> switching. Examples of connectionless systems are Ethernet, IP, and the <a href="/facts/User_Datagram_Protocol/dxLU0D6q">User Datagram Protocol</a> (UDP). Connection-oriented systems include X.25, <a href="/facts/Frame_Relay/bFdv0qIP">Frame Relay</a>, <a href="/facts/Multiprotocol_Label_Switching/k7cx1PWw">Multiprotocol Label Switching</a> (MPLS), and TCP.
In connectionless mode each packet is labeled with a destination address, source address, and port numbers. It may also be labeled with the sequence number of the packet. This information eliminates the need for a pre-established path to help the packet find its way to its destination, but means that more information is needed in the packet header, which is therefore larger. The packets are routed individually, sometimes taking different paths resulting in <a href="/facts/Out-of-order_delivery/ImewjL5P">out-of-order delivery</a>. At the destination, the original message may be reassembled in the correct order, based on the packet sequence numbers. Thus a <a href="/facts/Virtual_circuit/8HqpnTxl">virtual circuit</a> carrying a <a href="/facts/Byte_stream/Pf9oGYyY">byte stream</a> is provided to the application by a <a href="/facts/Transport_layer/UmIGUCeK">transport layer</a> protocol, although the network only provides a connectionless <a href="/facts/Network_layer/L2jAtJzQ">network layer</a> service.
Connection-oriented transmission requires a setup phase to establish the parameters of communication before any packet is transferred. The <a href="/facts/Signaling_(telecommunications)/6d4zgUj7">signaling</a> protocols used for setup allow the application to specify its requirements and discover link parameters. Acceptable values for service parameters may be negotiated. The packets transferred may include a connection identifier rather than address information and the packet header can be smaller, as it only needs to contain this code and any information, such as length, timestamp, or sequence number, which is different for different packets. In this case, address information is only transferred to each node during the connection setup phase, when the route to the destination is discovered and an entry is added to the switching table in each network node through which the connection passes. When a connection identifier is used, routing a packet requires the node to look up the connection identifier in a table.
Connection-oriented transport layer protocols such as TCP provide a connection-oriented service by using an underlying connectionless network. In this case, the end-to-end principle dictates that the end nodes, not the network itself, are responsible for the connection-oriented behavior.

<h2 id="packet-switching-in-networks">Packet switching in networks</h2>
In telecommunication networks, packet switching is used to optimize the usage of <a href="/facts/Channel_capacity/55wJYsS6">channel capacity</a> and increase <a href="/facts/Robustness_(computer_science)/jHr1dT3m">robustness</a>.<a class="footnote-ref" id="fnref:165" href="#fn:165">165</a> Compared to <a href="/facts/Circuit_switching/fJ3vdmAB">circuit switching</a>, packet switching is highly dynamic, allocating channel capacity based on usage instead of explicit reservations. This can reduce wasted capacity caused by underutilized reservations at the cost of removing bandwidth guarantees. In practice, <a href="/facts/TCP_congestion_control/gC9Fer09">congestion control</a> is generally used in IP networks to dynamically negotiate capacity between connections. Packet switching may also increase the robustness of networks in the face of failures. If a node fails, connections do not need to be interrupted, as packets may be routed around the failure.
Packet switching is used in the <a href="/facts/Internet/Xw1rVvJU">Internet</a> and most <a href="/facts/Local_area_network/edUDxJ6J">local area networks</a>. The Internet is implemented by the <a href="/facts/Internet_Protocol_Suite/KNkxtSpw">Internet Protocol Suite</a> using a variety of <a href="/facts/Link_layer/pHRpQ3k7">link layer</a> technologies. For example, Ethernet and Frame Relay are common. Newer <a href="/facts/Mobile_phone/H3EcqD9h">mobile phone</a> technologies (e.g., <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/LTE_(telecommunication)/72QhwXHT">LTE</a>) also use packet switching. Packet switching is associated with connectionless networking because, in these systems, no connection agreement needs to be established between communicating parties prior to exchanging data.
<a href="/facts/X.25/yaGPqw2Y">X.25</a>, the international <a href="/facts/CCITT/9nJwkPYx">CCITT</a> standard of 1976, is a notable use of packet switching in that it provides to users a service of <a href="/facts/Flow_control_(data)/qcdKcLon">flow-controlled</a> <a href="/facts/Virtual_circuit/8HqpnTxl">virtual circuits</a>. These virtual circuits reliably carry variable-length packets with data order preservation. <a href="/facts/DATAPAC/t1FxL7P4">DATAPAC</a> in Canada was the first public network to support X.25, followed by <a href="/facts/Transpac_(data_network)/gAKz2JqV">TRANSPAC</a> in France.<a class="footnote-ref" id="fnref:166" href="#fn:166">166</a>
<a href="/facts/Asynchronous_Transfer_Mode/SzA8ewFL">Asynchronous Transfer Mode</a> (ATM) is another virtual circuit technology. It differs from X.25 in that it uses small fixed-length packets (<a href="/facts/Cell_relay/bEbElAFL">cells</a>), and that the network imposes no <a href="/facts/Flow_control_(data)/qcdKcLon">flow control</a> to users.
Technologies such as MPLS and the <a href="/facts/Resource_Reservation_Protocol/LpJwLb55">Resource Reservation Protocol</a> (RSVP) create virtual circuits on top of datagram networks. MPLS and its predecessors, as well as ATM, have been called "fast packet" technologies. MPLS, indeed, has been called "ATM without cells".<a class="footnote-ref" id="fnref:167" href="#fn:167">167</a> Virtual circuits are especially useful in building robust failover mechanisms and allocating bandwidth for delay-sensitive applications.

<h2 id="packet-switched-networks">Packet-switched networks</h2>
Further information: <a href="/facts/History_of_the_Internet/frRuaPrU">History of the Internet</a>
Donald Davies' work in the late 1960s on data communications and computer network design became well known in the United States, Europe and Japan and was the "cornerstone" that inspired numerous packet switching networks in the decade following.<a class="footnote-ref" id="fnref:168" href="#fn:168">168</a><a class="footnote-ref" id="fnref:169" href="#fn:169">169</a><a class="footnote-ref" id="fnref:170" href="#fn:170">170</a><a class="footnote-ref" id="fnref:171" href="#fn:171">171</a><a class="footnote-ref" id="fnref:172" href="#fn:172">172</a><a class="footnote-ref" id="fnref:173" href="#fn:173">173</a><a class="footnote-ref" id="fnref:174" href="#fn:174">174</a><a class="footnote-ref" id="fnref:175" href="#fn:175">175</a> 
The history of packet-switched networks can be divided into three overlapping eras: early networks before the introduction of X.25; the X.25 era when many <a href="/facts/Postal%2c_telegraph_and_telephone_service/Ec1V8LhK">postal, telephone, and telegraph</a> (PTT) companies provided <a href="/facts/Public_data_network/sMYs1t3f">public data networks</a> with X.25 interfaces; and the <a href="/facts/Internet/Xw1rVvJU">Internet</a> era which initially <a href="/facts/Protocol_Wars/G255zc48">competed with</a> the <a href="/facts/OSI_model/oxN9Xhjz">OSI model</a>.<a class="footnote-ref" id="fnref:176" href="#fn:176">176</a><a class="footnote-ref" id="fnref:177" href="#fn:177">177</a><a class="footnote-ref" id="fnref:178" href="#fn:178">178</a>

<h3>Early networks</h3>
Research into packet switching at the <a href="/facts/National_Physical_Laboratory_(United_Kingdom)/NM5HzE0b">National Physical Laboratory</a> (NPL) began with a proposal for a wide-area network in 1965,<a class="footnote-ref" id="fnref:179" href="#fn:179">179</a> and a local-area network in 1966.<a class="footnote-ref" id="fnref:180" href="#fn:180">180</a> ARPANET funding was secured in 1966 by <a href="/facts/Robert_Taylor_(computer_scientist)/VyTkFyta">Bob Taylor</a>, and planning began in 1967 when he hired <a href="/facts/Lawrence_Roberts_(scientist)/WoY2CXUr">Larry Roberts</a>. The NPL network followed by the ARPANET became operational in 1969, the first two networks to use packet switching.<a class="footnote-ref" id="fnref:181" href="#fn:181">181</a><a class="footnote-ref" id="fnref:182" href="#fn:182">182</a> Larry Roberts said many of the packet switching networks built in the 1970s were similar "in nearly all respects" to Donald Davies' original 1965 design.<a class="footnote-ref" id="fnref:183" href="#fn:183">183</a> The ARPANET and Louis Pouzin's CYCLADES were the primary precursor networks of the modern <a href="/facts/Internet/Xw1rVvJU">Internet</a>.<a class="footnote-ref" id="fnref:184" href="#fn:184">184</a> CYCLADES, unlike ARPANET, was explicitly designed to research internetworking.<a class="footnote-ref" id="fnref:185" href="#fn:185">185</a>
Before the introduction of X.25 in 1976,<a class="footnote-ref" id="fnref:186" href="#fn:186">186</a> about twenty different network technologies had been developed. Two fundamental differences involved the division of functions and tasks between the hosts at the edge of the network and the network core. In the datagram system, operating according to the end-to-end principle, the hosts have the responsibility to ensure orderly delivery of packets. In the <a href="/facts/Virtual_call_capability/8HqpnTxl">virtual call</a> system, the network guarantees sequenced delivery of data to the host. This results in a simpler host interface but complicates the network. The X.25 protocol suite uses this network type.

<h4>AppleTalk</h4>
<a href="/facts/AppleTalk/6j3NRgTl">AppleTalk</a> is a proprietary suite of networking protocols developed by <a href="/facts/Apple_Inc./oTJYta3k">Apple</a> in 1985 for <a href="/facts/Apple_Macintosh/8GhnXTK0">Apple Macintosh</a> computers. It was the primary protocol used by Apple devices through the 1980s and 1990s. AppleTalk included features that allowed <a href="/facts/Local_area_network/edUDxJ6J">local area networks</a> to be established ad hoc without the requirement for a centralized router or server. The AppleTalk system automatically assigned addresses, updated the distributed namespace, and configured any required <a href="/facts/Internetworking/sCyckA2T">inter-network routing</a>. It was a <a href="/facts/Plug-n-play/LISny9tL">plug-n-play</a> system.<a class="footnote-ref" id="fnref:187" href="#fn:187">187</a><a class="footnote-ref" id="fnref:188" href="#fn:188">188</a>
AppleTalk implementations were also released for the <a href="/facts/IBM_PC/yhcJGMPL">IBM PC</a> and compatibles, and the <a href="/facts/Apple_IIGS/IXyL2fd4">Apple IIGS</a>. AppleTalk support was available in most networked printers, especially <a href="/facts/Laser_printer/fJ2GrUBj">laser printers</a>, some <a href="/facts/File_server/4SFrAdHY">file servers</a> and <a href="/facts/Router_(computing)/Nh5cIyVf">routers</a>.
The protocol was designed to be simple, autoconfiguring, and not require servers or other specialized services to work. These benefits also created drawbacks, as Appletalk tended not to use bandwidth efficiently. AppleTalk support was terminated in 2009.<a class="footnote-ref" id="fnref:189" href="#fn:189">189</a><a class="footnote-ref" id="fnref:190" href="#fn:190">190</a>

<h4>ARPANET</h4>
The <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a> was a progenitor network of the Internet and one of the first networks, along with ARPA's <a href="/facts/SATNET/QAA5Lmxm">SATNET</a>, to run the <a href="/facts/TCP%2fIP/KNkxtSpw">TCP/IP</a> suite using packet switching technologies.

<h4>BNRNET</h4>
BNRNET was a network which <a href="/facts/Bell-Northern_Research/U9jqR92v">Bell-Northern Research</a> developed for internal use. It initially had only one host but was designed to support many hosts. BNR later made major contributions to the CCITT X.25 project.<a class="footnote-ref" id="fnref:191" href="#fn:191">191</a>

<h4>Cambridge Ring</h4>
The <a href="/facts/Cambridge_Ring_(computer_network)/jXQELbb8">Cambridge Ring</a> was an experimental <a href="/facts/Ring_network/GDnXYWDv">ring network</a> developed at the <a href="/facts/Computer_Laboratory%2c_University_of_Cambridge/Dd9unFtw">Computer Laboratory, University of Cambridge</a>. It operated from 1974 until the 1980s.

<h4>CompuServe</h4>
<a href="/facts/CompuServe/Pjpdcf2a">CompuServe</a> developed its own packet switching network, implemented on DEC <a href="/facts/PDP-11/9HkGUzFn">PDP-11</a> minicomputers acting as network nodes that were installed throughout the US (and later, in other countries) and interconnected. Over time, the CompuServe network evolved into a complicated multi-tiered network incorporating ATM, Frame Relay, IP and X.25 technologies.

<h4>CYCLADES</h4>
The <a href="/facts/CYCLADES/kJX66P6D">CYCLADES</a> packet switching network was a French research network designed and directed by <a href="/facts/Louis_Pouzin/3xeGwxzy">Louis Pouzin</a>. First demonstrated in 1973, it was developed to explore alternatives to the early ARPANET design and to support network research generally. It was the first network to use the end-to-end principle and make the hosts responsible for reliable delivery of data, rather than the network itself. Concepts of this network influenced later ARPANET architecture.<a class="footnote-ref" id="fnref:192" href="#fn:192">192</a><a class="footnote-ref" id="fnref:193" href="#fn:193">193</a>

<h4>DECnet</h4>
<a href="/facts/DECnet/9wnFzPvn">DECnet</a> is a suite of network protocols created by <a href="/facts/Digital_Equipment_Corporation/ztxs6keA">Digital Equipment Corporation</a>, originally released in 1975 in order to connect two <a href="/facts/PDP-11/9HkGUzFn">PDP-11</a> <a href="/facts/Minicomputer/g8hvpQxe">minicomputers</a>.<a class="footnote-ref" id="fnref:194" href="#fn:194">194</a> It evolved into one of the first <a href="/facts/Peer-to-peer/wCCdPb0H">peer-to-peer</a> network architectures, thus transforming DEC into a networking powerhouse in the 1980s. Initially built with three <a href="/facts/Abstraction_layer/EV8c84SY">layers</a>, it later (1982) evolved into a seven-layer <a href="/facts/Open_Systems_Interconnection/oxN9Xhjz">OSI</a>-compliant networking protocol. The DECnet protocols were designed entirely by Digital Equipment Corporation. However, DECnet Phase II (and later) were <a href="/facts/Open_standard/RGvhGQVI">open standards</a> with published specifications, and several implementations were developed outside DEC, including one for <a href="/facts/Linux/9FvCKSTq">Linux</a>.

<h4>DDX-1</h4>
DDX-1 was an experimental network from Nippon PTT. It mixed circuit switching and packet switching. It was succeeded by DDX-2.<a class="footnote-ref" id="fnref:195" href="#fn:195">195</a>

<h4>EIN </h4>
The European Informatics Network (EIN), originally called COST 11, was a project beginning in 1971 to link networks in Britain, France, Italy, Switzerland and <a href="/facts/Euratom/tYFVyafy">Euratom</a>. Six other European countries also participated in the research on network protocols. Derek Barber directed the project, and <a href="/facts/Roger_Scantlebury/SFtHHRKb">Roger Scantlebury</a> led the UK technical contribution; both were from <a href="/facts/National_Physical_Laboratory_(United_Kingdom)/NM5HzE0b">NPL</a>.<a class="footnote-ref" id="fnref:196" href="#fn:196">196</a><a class="footnote-ref" id="fnref:197" href="#fn:197">197</a><a class="footnote-ref" id="fnref:198" href="#fn:198">198</a><a class="footnote-ref" id="fnref:199" href="#fn:199">199</a> The contract for its implementation was awarded to an Anglo French consortium led by the UK systems house <a href="/facts/Logica/8JnpJLtt">Logica</a> and Sesa and managed by <a href="/facts/Andrew_Karney/6wFbN3kH">Andrew Karney</a>. Work began in 1973 and it became operational in 1976 including nodes linking the <a href="/facts/NPL_network/JWc0pxUu">NPL network</a> and <a href="/facts/CYCLADES/kJX66P6D">CYCLADES</a>.<a class="footnote-ref" id="fnref:200" href="#fn:200">200</a> Barber proposed and implemented a mail protocol for EIN.<a class="footnote-ref" id="fnref:201" href="#fn:201">201</a> The transport protocol of the EIN helped to launch the <a href="/facts/International_Network_Working_Group/6Tstxz9Q">INWG</a> and X.25 protocols.<a class="footnote-ref" id="fnref:202" href="#fn:202">202</a><a class="footnote-ref" id="fnref:203" href="#fn:203">203</a><a class="footnote-ref" id="fnref:204" href="#fn:204">204</a> EIN was replaced by Euronet in 1979.<a class="footnote-ref" id="fnref:205" href="#fn:205">205</a>

<h4>EPSS</h4>
The Experimental Packet Switched Service (EPSS) was an experiment of the UK <a href="/facts/Post_Office_Telecommunications/vG5Vpt39">Post Office Telecommunications</a>. It was the first <a href="/facts/Public_data_network/sMYs1t3f">public data network</a> in the UK when it began operating in 1976.<a class="footnote-ref" id="fnref:206" href="#fn:206">206</a> <a href="/facts/Ferranti/UA1e5VBN">Ferranti</a> supplied the hardware and software. The handling of link control messages (acknowledgements and flow control) was different from that of most other networks.<a class="footnote-ref" id="fnref:207" href="#fn:207">207</a><a class="footnote-ref" id="fnref:208" href="#fn:208">208</a><a class="footnote-ref" id="fnref:209" href="#fn:209">209</a>

<h4>GEIS</h4>
As General Electric Information Services (GEIS), <a href="/facts/General_Electric/bBm5CzVY">General Electric</a> was a major international provider of information services. The company originally designed a telephone network to serve as its internal (albeit continent-wide) voice telephone network.
In 1965, at the instigation of Warner Sinback, a data network based on this voice-phone network was designed to connect GE's four computer sales and service centers (Schenectady, New York, Chicago, and Phoenix) to facilitate a computer time-sharing service.
After going international some years later, GEIS created a network data center near <a href="/facts/Cleveland/rQb7qveu">Cleveland</a>, Ohio. Very little has been published about the internal details of their network. The design was hierarchical with redundant communication links.<a class="footnote-ref" id="fnref:210" href="#fn:210">210</a><a class="footnote-ref" id="fnref:211" href="#fn:211">211</a>

<h4>IPSANET</h4>
<a href="/facts/IPSANET/u0ohnnpC">IPSANET</a> was a semi-private network constructed by <a href="/facts/I._P._Sharp_Associates/cxfVTQ9d">I. P. Sharp Associates</a> to serve their time-sharing customers. It became operational in May 1976.<a class="footnote-ref" id="fnref:212" href="#fn:212">212</a>

<h4>IPX/SPX</h4>
The <a href="/facts/IPX%2fSPX/LCEn03Af">Internetwork Packet Exchange</a> (IPX) and Sequenced Packet Exchange (SPX) are <a href="/facts/Novell/lABGMT7U">Novell</a> networking protocols from the 1980s derived from Xerox Network Systems' IDP and SPP protocols, respectively which date back to the 1970s. IPX/SPX was used primarily on networks using the <a href="/facts/NetWare/cfnyxMzs">Novell NetWare operating systems</a>.<a class="footnote-ref" id="fnref:213" href="#fn:213">213</a>

<h4>Merit Network</h4>
<a href="/facts/Merit_Network/1qL7oxsn">Merit Network</a>, an independent <a href="/facts/Nonprofit_organization/AmXu2c85">nonprofit organization</a> governed by Michigan's public universities,<a class="footnote-ref" id="fnref:214" href="#fn:214">214</a> was formed in 1966 as the Michigan Educational Research Information Triad to explore computer networking between three of Michigan's public universities as a means to help the state's educational and economic development.<a class="footnote-ref" id="fnref:215" href="#fn:215">215</a> With initial support from the <a href="/facts/State_of_Michigan/bCurmfT2">State of Michigan</a> and the <a href="/facts/National_Science_Foundation/FlDT8TbW">National Science Foundation</a> (NSF), the packet-switched network was first demonstrated in December 1971 when an interactive host-to-host connection was made between the <a href="/facts/IBM_mainframe/0kPkgADx">IBM mainframe</a> systems at the <a href="/facts/University_of_Michigan/6e1Ea5xh">University of Michigan</a> in <a href="/facts/Ann_Arbor/hs3CBRJy">Ann Arbor</a> and <a href="/facts/Wayne_State_University/DI8huwcr">Wayne State University</a> in <a href="/facts/Detroit/S84s4PGo">Detroit</a>.<a class="footnote-ref" id="fnref:216" href="#fn:216">216</a> In October 1972, connections to the <a href="/facts/Control_Data_Corporation/ChfGgfPM">CDC</a> mainframe at <a href="/facts/Michigan_State_University/faLD1NUz">Michigan State University</a> in <a href="/facts/East_Lansing/dyslFzXA">East Lansing</a> completed the triad. Over the next several years, in addition to host-to-host interactive connections, the network was enhanced to support terminal-to-host connections, host-to-host batch connections (remote job submission, remote printing, batch file transfer), interactive file transfer, gateways to the <a href="/facts/Tymnet/wFM59Gtb">Tymnet</a> and <a href="/facts/Telenet/VCgNaKux">Telenet</a> <a href="/facts/Public_data_network/sMYs1t3f">public data networks</a>, X.25 host attachments, gateways to X.25 data networks, Ethernet attached hosts, and eventually <a href="/facts/TCP%2fIP/KNkxtSpw">TCP/IP</a>; additionally, <a href="/facts/List_of_colleges_and_universities_in_Michigan/IedJbDoa">public universities in Michigan</a> joined the network.<a class="footnote-ref" id="fnref:217" href="#fn:217">217</a><a class="footnote-ref" id="fnref:218" href="#fn:218">218</a> All of this set the stage for Merit's role in the <a href="/facts/NSFNET/b95QF5hR">NSFNET</a> project starting in the mid-1980s.

<h4>NPL</h4>
<a href="/facts/Donald_Davies/zHGN8LXl">Donald Davies</a> of the <a href="/facts/National_Physical_Laboratory_(United_Kingdom)/NM5HzE0b">National Physical Laboratory (United Kingdom)</a> designed and proposed a national commercial data network based on packet switching in 1965.<a class="footnote-ref" id="fnref:219" href="#fn:219">219</a><a class="footnote-ref" id="fnref:220" href="#fn:220">220</a> The proposal was not taken up nationally but the following year, he designed a <a href="/facts/Local_network/edUDxJ6J">local network</a> using "interface computers", today known as <a href="/facts/Router_(computing)/Nh5cIyVf">routers</a>, to serve the needs of NPL and prove the feasibility of packet switching.<a class="footnote-ref" id="fnref:221" href="#fn:221">221</a>
By 1968 Davies had begun building the <a href="/facts/NPL_network/JWc0pxUu">NPL network</a> to meet the needs of the multidisciplinary laboratory and prove the technology under operational conditions.<a class="footnote-ref" id="fnref:222" href="#fn:222">222</a><a class="footnote-ref" id="fnref:223" href="#fn:223">223</a><a class="footnote-ref" id="fnref:224" href="#fn:224">224</a> In 1969, the NPL, followed by the ARPANET, were the first two networks to use packet switching.<a class="footnote-ref" id="fnref:225" href="#fn:225">225</a><a class="footnote-ref" id="fnref:226" href="#fn:226">226</a> By 1976, 12 computers and 75 terminal devices were attached,<a class="footnote-ref" id="fnref:227" href="#fn:227">227</a> and more were added until the network was replaced in 1986. NPL was the first to use high-speed links.<a class="footnote-ref" id="fnref:228" href="#fn:228">228</a><a class="footnote-ref" id="fnref:229" href="#fn:229">229</a><a class="footnote-ref" id="fnref:230" href="#fn:230">230</a>

<h4>Octopus</h4>
Octopus was a local network at <a href="/facts/Lawrence_Livermore_National_Laboratory/WuXIbIKz">Lawrence Livermore National Laboratory</a>. It connected sundry hosts at the lab to interactive terminals and various computer peripherals including a bulk storage system.<a class="footnote-ref" id="fnref:231" href="#fn:231">231</a><a class="footnote-ref" id="fnref:232" href="#fn:232">232</a><a class="footnote-ref" id="fnref:233" href="#fn:233">233</a>

<h4>Philips Research</h4>
<a href="/facts/Philips/Xp4uczGg">Philips</a> Research Laboratories in <a href="/facts/Redhill%2c_Surrey/VogQeoYs">Redhill, Surrey</a> developed a packet switching network for internal use. It was a datagram network with a single switching node.<a class="footnote-ref" id="fnref:234" href="#fn:234">234</a>

<h4>PUP</h4>
<a href="/facts/PARC_Universal_Packet/ub0fExbh">PARC Universal Packet</a> (PUP or Pup) was one of the two earliest <a href="/facts/Internetworking/sCyckA2T">internetworking</a> <a href="/facts/Protocol_suite/Btj9FtwJ">protocol suites</a>; it was created by researchers at <a href="/facts/Xerox_PARC/fh2Su0k9">Xerox PARC</a> in the mid-1970s. The entire suite provided <a href="/facts/Routing/Ml6MVCaC">routing</a> and packet delivery, as well as higher level functions such as a <a href="/facts/Reliable_byte_stream/YbSblvM5">reliable byte stream</a>, along with numerous applications. Further developments led to <a href="/facts/Xerox_Network_Systems/2pfVfFgY">Xerox Network Systems</a> (XNS).<a class="footnote-ref" id="fnref:235" href="#fn:235">235</a>

<h4>RCP</h4>
RCP was an experimental network created by the <a href="/facts/Postes%2c_T%25C3%25A9l%25C3%25A9graphes_et_T%25C3%25A9l%25C3%25A9phones_(France)/PAhxN2gS">French PTT</a>. It was used to gain experience with packet switching technology before the specification of the <a href="/facts/Transpac_(data_network)/gAKz2JqV">TRANSPAC</a> public network was frozen. RCP was a <a href="/facts/Virtual_circuit/8HqpnTxl">virtual-circuit</a> network in contrast to CYCLADES which was based on <a href="/facts/Datagram/TMHVctMz">datagrams</a>. RCP emphasised terminal-to-host and terminal-to-terminal connection; CYCLADES was concerned with host-to-host communication. RCP influenced the X.25 specification, which was deployed on TRANSPAC and other public data networks.<a class="footnote-ref" id="fnref:236" href="#fn:236">236</a><a class="footnote-ref" id="fnref:237" href="#fn:237">237</a><a class="footnote-ref" id="fnref:238" href="#fn:238">238</a>

<h4>RETD</h4>
Red Especial de Transmisión de Datos (RETD) was a network developed by <a href="/facts/Compa%25C3%25B1%25C3%25ADa_Telef%25C3%25B3nica_Nacional_de_Espa%25C3%25B1a/9oQKlCw8">Compañía Telefónica Nacional de España</a>. It became operational in 1972 and thus was the first public network.<a class="footnote-ref" id="fnref:239" href="#fn:239">239</a><a class="footnote-ref" id="fnref:240" href="#fn:240">240</a><a class="footnote-ref" id="fnref:241" href="#fn:241">241</a><a class="footnote-ref" id="fnref:242" href="#fn:242">242</a>

<h4>SCANNET</h4>
"The experimental packet-switched Nordic telecommunication network SCANNET was implemented in Nordic technical libraries in the 1970s, and it included first Nordic electronic journal Extemplo. Libraries were also among first ones in universities to accommodate microcomputers for public use in the early 1980s."<a class="footnote-ref" id="fnref:243" href="#fn:243">243</a>

<h4>SITA HLN</h4>
<a href="/facts/SITA_(IT_company)/GNNI98Nn">SITA</a> is a consortium of airlines. Its High Level Network (HLN) became operational in 1969. Although organised to act like a packet-switching network,<a class="footnote-ref" id="fnref:244" href="#fn:244">244</a> it still used <a href="/facts/Message_switching/Jro8I31X">message switching</a>.<a class="footnote-ref" id="fnref:245" href="#fn:245">245</a><a class="footnote-ref" id="fnref:246" href="#fn:246">246</a> As with many non-academic networks, very little has been published about it.

<h4>SRCnet/SERCnet</h4>
A number of computer facilities serving the <a href="/facts/Science_Research_Council/LkjUJeFS">Science Research Council</a> (SRC) community in the United Kingdom developed beginning in the early 1970s. Each had their own star network (<a href="/facts/University_of_London_Computer_Centre/nNRoKEEx">ULCC London</a>, UMRCC Manchester, <a href="/facts/Rutherford_Appleton_Laboratory/LuHVhXIE">Rutherford Appleton Laboratory</a>). There were also regional networks centred on Bristol (on which work was initiated in the late 1960s) followed in the mid-late 1970s by Edinburgh, the Midlands and Newcastle. These groups of institutions <a href="/facts/Shared_resource/tmLvfkwR">shared resources</a> to provide better computing facilities than could be afforded individually. The networks were each based on one manufacturer's standards and were mutually incompatible and overlapping.<a class="footnote-ref" id="fnref:247" href="#fn:247">247</a><a class="footnote-ref" id="fnref:248" href="#fn:248">248</a><a class="footnote-ref" id="fnref:249" href="#fn:249">249</a> In 1981, the SRC was renamed the <a href="/facts/Science_and_Engineering_Research_Council/LkjUJeFS">Science and Engineering Research Council</a> (SERC). In the early 1980s a standardisation and interconnection effort started, hosted on an expansion of the SERCnet research network and based on the <a href="/facts/Coloured_Book_protocols/oozh8pDh">Coloured Book protocols</a>, later evolving into <a href="/facts/JANET/9eJ6RKAC">JANET</a>.<a class="footnote-ref" id="fnref:250" href="#fn:250">250</a><a class="footnote-ref" id="fnref:251" href="#fn:251">251</a><a class="footnote-ref" id="fnref:252" href="#fn:252">252</a>

<h4>Systems Network Architecture</h4>
<a href="/facts/Systems_Network_Architecture/NlFaXaBC">Systems Network Architecture</a> (SNA) is <a href="/facts/IBM/QszA7nwd">IBM</a>'s proprietary networking architecture created in 1974. An IBM customer could acquire hardware and software from IBM and lease private lines from a common carrier to construct a private network.<a class="footnote-ref" id="fnref:253" href="#fn:253">253</a>

<h4>Telenet</h4>
<a href="/facts/Telenet/VCgNaKux">Telenet</a> was the first FCC-licensed <a href="/facts/Public_data_network/sMYs1t3f">public data network</a> in the United States. Telenet was incorporated in 1973 and started operations in 1975. It was founded by <a href="/facts/Bolt_Beranek_%2526_Newman/9kA7axL3">Bolt Beranek & Newman</a> with <a href="/facts/Lawrence_Roberts_(scientist)/WoY2CXUr">Larry Roberts</a> as CEO as a means of making packet switching technology public. Telenet initially used a proprietary <a href="/facts/Virtual_circuit/8HqpnTxl">Virtual circuit</a> host interface, but changed it to X.25 and the terminal interface to X.29 after their standardization in <a href="/facts/CCITT/9nJwkPYx">CCITT</a>.<a class="footnote-ref" id="fnref:254" href="#fn:254">254</a> It went public in 1979 and was then sold to GTE.<a class="footnote-ref" id="fnref:255" href="#fn:255">255</a><a class="footnote-ref" id="fnref:256" href="#fn:256">256</a>

<h4>Tymnet</h4>
<a href="/facts/Tymnet/wFM59Gtb">Tymnet</a> was an international data communications network headquartered in San Jose, CA. In 1969, it began install a network based on minicomputers to connect timesharing terminals to its central computers. The network used store-and-forward and voice-grade lines. Routing was not distributed, rather it was established by a central supervisor on a call-by-call basis.<a class="footnote-ref" id="fnref:257" href="#fn:257">257</a>

<h3>X.25 era</h3>
See also: <a href="/facts/Public_data_network/sMYs1t3f">Public data network</a>

There were two kinds of X.25 networks. Some such as <a href="/facts/DATAPAC/t1FxL7P4">DATAPAC</a> and <a href="/facts/Transpac_(data_network)/gAKz2JqV">TRANSPAC</a> were initially implemented with an X.25 external interface. Some older networks such as TELENET and TYMNET were modified to provide an X.25 host interface in addition to older host connection schemes. DATAPAC was developed by <a href="/facts/Bell-Northern_Research/U9jqR92v">Bell-Northern Research</a> which was a joint venture of <a href="/facts/Bell_Canada/k3hgDpJA">Bell Canada</a> (a common carrier) and <a href="/facts/Northern_Telecom/VYJnskS6">Northern Telecom</a> (a telecommunications equipment supplier). Northern Telecom sold several DATAPAC clones to foreign PTTs including the <a href="/facts/Deutsche_Bundespost/AyyuMutt">Deutsche Bundespost</a>. <a href="/facts/X.75/8xsJKxro">X.75</a> and <a href="/facts/X.121/06alBblr">X.121</a> allowed the interconnection of national X.25 networks.

<h4>AUSTPAC</h4>
<a href="/facts/AUSTPAC/bgnWRMkH">AUSTPAC</a> was an Australian public X.25 network operated by <a href="/facts/Telstra/tm3J2MTK">Telstra</a>. Established by Telstra's predecessor Telecom Australia in the early 1980s, AUSTPAC was Australia's first public packet-switched data network and supported applications such as on-line betting, financial applications—the <a href="/facts/Australian_Tax_Office/L3yQ04E2">Australian Tax Office</a> made use of AUSTPAC—and remote terminal access to academic institutions, who maintained their connections to AUSTPAC up until the mid-late 1990s in some cases. Access was via a dial-up terminal to a <a href="/facts/Packet_Assembler%2fDisassembler/QRYJcnBm">PAD</a>, or, by linking a permanent X.25 node to the network.<a class="footnote-ref" id="fnref:258" href="#fn:258">258</a>

<h4>ConnNet</h4>
<a href="/facts/ConnNet/T9SyFSGR">ConnNet</a> was a network operated by the <a href="/facts/Southern_New_England_Telephone_Company/TFbXnTax">Southern New England Telephone Company</a> serving the state of Connecticut.<a class="footnote-ref" id="fnref:259" href="#fn:259">259</a><a class="footnote-ref" id="fnref:260" href="#fn:260">260</a> Launched on March 11, 1985, it was the first local public packet-switched network in the United States.<a class="footnote-ref" id="fnref:261" href="#fn:261">261</a>

<h4>Datanet 1</h4>
Datanet 1 was the public switched data network operated by the Dutch PTT Telecom (now known as <a href="/facts/KPN/dJoBMWj8">KPN</a>). Strictly speaking Datanet 1 only referred to the network and the connected users via <a href="/facts/Leased_line/JzGppCIP">leased lines</a> (using the <a href="/facts/X.121/06alBblr">X.121</a> DNIC 2041), the name also referred to the public <a href="/facts/Packet_Assembler%2fDisassembler/QRYJcnBm">PAD</a> service Telepad (using the DNIC 2049). And because the main <a href="/facts/Videotex/psxycPcf">Videotex</a> service used the network and modified PAD devices as infrastructure the name Datanet 1 was used for these services as well.<a class="footnote-ref" id="fnref:262" href="#fn:262">262</a>

<h4>DATAPAC</h4>
<a href="/facts/DATAPAC/t1FxL7P4">DATAPAC</a> was the first operational X.25 network (1976).<a class="footnote-ref" id="fnref:263" href="#fn:263">263</a> It covered major Canadian cities and was eventually extended to smaller centers.

<h4>Datex-P</h4>
Deutsche Bundespost operated the Datex-P national network in Germany. The technology was acquired from Northern Telecom.<a class="footnote-ref" id="fnref:264" href="#fn:264">264</a>

<h4>Eirpac</h4>
<a href="/facts/Eirpac/J9tu1MkL">Eirpac</a> is the Irish public switched data network supporting X.25 and <a href="/facts/X.28/euFmeb9M">X.28</a>. It was launched in 1984, replacing Euronet. Eirpac is run by <a href="/facts/Eircom/CtMxlaJl">Eircom</a>.<a class="footnote-ref" id="fnref:265" href="#fn:265">265</a><a class="footnote-ref" id="fnref:266" href="#fn:266">266</a><a class="footnote-ref" id="fnref:267" href="#fn:267">267</a>

<h4>Euronet</h4>
Nine member states of the <a href="/facts/European_Economic_Community/tx2V9KAQ">European Economic Community</a> contracted with <a href="/facts/Logica/8JnpJLtt">Logica</a> and the French company SESA to set up a joint venture in 1975 to undertake the Euronet development, using X.25 protocols to form virtual circuits. It was to replace EIN and established a network in 1979 linking a number of European countries until 1984 when the network was handed over to national PTTs.<a class="footnote-ref" id="fnref:268" href="#fn:268">268</a><a class="footnote-ref" id="fnref:269" href="#fn:269">269</a>

<h4>HIPA-NET</h4>
<a href="/facts/Hitachi/KeK38e82">Hitachi</a> designed a private network system for sale as a turnkey package to multi-national organizations.[when?] In addition to providing X.25 packet switching, message switching software was also included. Messages were buffered at the nodes adjacent to the sending and receiving terminals. Switched virtual calls were not supported, but through the use of logical ports an originating terminal could have a menu of pre-defined destination terminals.<a class="footnote-ref" id="fnref:270" href="#fn:270">270</a>

<h4>Iberpac</h4>
<a href="/facts/Iberpac/SbDPvd80">Iberpac</a> is the Spanish public packet-switched network, providing X.25 services. It was based on RETD which was operational since 1972. Iberpac was run by <a href="/facts/Telefonica/9oQKlCw8">Telefonica</a>.<a class="footnote-ref" id="fnref:271" href="#fn:271">271</a>

<h4>IPSS</h4>
In 1978, X.25 provided the first international and commercial packet-switching network, the <a href="/facts/International_Packet_Switched_Service/AySBBjFP">International Packet Switched Service</a> (IPSS).

<h4>JANET</h4>
<a href="/facts/JANET/9eJ6RKAC">JANET</a> was the UK academic and research network, linking all universities, higher education establishments, and publicly funded research laboratories following its launch in 1984.<a class="footnote-ref" id="fnref:272" href="#fn:272">272</a> The X.25 network, which used the <a href="/facts/Coloured_Book_protocols/oozh8pDh">Coloured Book protocols</a>, was based mainly on <a href="/facts/GEC_4000_series/bwDmUUH6">GEC 4000 series</a> switches, and ran X.25 links at up to 8 Mbit/s in its final phase before being converted to an IP-based network in 1991. The JANET network grew out of the 1970s SRCnet, later called SERCnet.<a class="footnote-ref" id="fnref:273" href="#fn:273">273</a>

<h4>PSS</h4>
<a href="/facts/Packet_Switch_Stream/Kcjlc5wL">Packet Switch Stream</a> (PSS) was the <a href="/facts/Post_Office_Telecommunications/vG5Vpt39">Post Office Telecommunications</a> (later to become <a href="/facts/British_Telecom/RV9sGpcD">British Telecom</a>) national X.25 network with a <a href="/facts/Data_network_identification_code/06alBblr">DNIC</a> of 2342. British Telecom renamed PSS Global Network Service (GNS), but the PSS name has remained better known. PSS also included public dial-up PAD access, and various InterStream gateways to other services such as Telex.

<h4>REXPAC</h4>
REXPAC was the nationwide experimental packet switching data network in Brazil, developed by the research and development center of <a href="/facts/Telebr%25C3%25A1s/USazRVnA">Telebrás</a>, the state-owned public telecommunications provider.<a class="footnote-ref" id="fnref:274" href="#fn:274">274</a>

<h4>SITA Data Transport Network</h4>
<a href="/facts/SITA_(IT_company)/GNNI98Nn">SITA</a> is a consortium of airlines. Its Data Transport Network adopted X.25 in 1981, becoming the world's most extensive packet-switching network.<a class="footnote-ref" id="fnref:275" href="#fn:275">275</a><a class="footnote-ref" id="fnref:276" href="#fn:276">276</a><a class="footnote-ref" id="fnref:277" href="#fn:277">277</a> As with many non-academic networks, very little has been published about it.

<h4>TRANSPAC</h4>
<a href="/facts/Transpac_(data_network)/gAKz2JqV">TRANSPAC</a> was the national X.25 network in France.<a class="footnote-ref" id="fnref:278" href="#fn:278">278</a> It was developed locally at about the same time as DATAPAC in Canada. The development was done by the French PTT and influenced by its preceding expreimental networkRCP.<a class="footnote-ref" id="fnref:279" href="#fn:279">279</a> It began operation in 1978, and served commercial users and, after <a href="/facts/Minitel/bTmoGeyh">Minitel</a> began, consumers.<a class="footnote-ref" id="fnref:280" href="#fn:280">280</a>

<h4>Tymnet</h4>
<a href="/facts/Tymnet/wFM59Gtb">Tymnet</a> utilized virtual call packet switched technology including X.25, SNA/SDLC, BSC and ASCII interfaces to connect host computers (servers) at thousands of large companies, educational institutions, and government agencies. Users typically connected via dial-up connections or dedicated <a href="/facts/Asynchronous_serial/amrIkBQR">asynchronous serial</a> connections. The business consisted of a large public network that supported dial-up users and a private network business that allowed government agencies and large companies (mostly banks and airlines) to build their own dedicated networks. The private networks were often connected via gateways to the public network to reach locations not on the private network. Tymnet was also connected to dozens of other public networks in the U.S. and internationally via X.25/X.75 gateways.<a class="footnote-ref" id="fnref:281" href="#fn:281">281</a><a class="footnote-ref" id="fnref:282" href="#fn:282">282</a>

<h4>UNINETT</h4>
UNINETT was a wide-area Norwegian packet-switched network established through a joint effort between Norwegian universities, research institutions and the Norwegian Telecommunication administration. The original network was based on X.25; Internet protocols were adopted later.<a class="footnote-ref" id="fnref:283" href="#fn:283">283</a>

<h4>VENUS-P</h4>
VENUS-P was an international X.25 network that operated from April 1982 through March 2006. At its subscription peak in 1999, VENUS-P connected 207 networks in 87 countries.<a class="footnote-ref" id="fnref:284" href="#fn:284">284</a>

<h4>XNS</h4>
<a href="/facts/Xerox_Network_Systems/2pfVfFgY">Xerox Network Systems</a> (XNS) was a <a href="/facts/Protocol_suite/Btj9FtwJ">protocol suite</a> promulgated by <a href="/facts/Xerox/qyxVVqaa">Xerox</a>, which provided <a href="/facts/Routing/Ml6MVCaC">routing</a> and packet delivery, as well as higher level functions such as a <a href="/facts/Reliable_stream/YbSblvM5">reliable stream</a>, and <a href="/facts/Remote_procedure_call/uMMb9CQw">remote procedure calls</a>. It was developed from <a href="/facts/PARC_Universal_Packet/ub0fExbh">PARC Universal Packet</a> (PUP).<a class="footnote-ref" id="fnref:285" href="#fn:285">285</a><a class="footnote-ref" id="fnref:286" href="#fn:286">286</a>

<h3>Internet era</h3>

When <a href="/facts/Internet/Xw1rVvJU">Internet</a> connectivity was made available to anyone who could pay for an <a href="/facts/Internet_service_provider/dUacAxef">Internet service provider</a> subscription, the distinctions between national networks blurred. The user no longer saw network identifiers such as the DNIC. Some older technologies such as <a href="/facts/Circuit_switching/fJ3vdmAB">circuit switching</a> have resurfaced with new names such as <a href="/facts/Fast_packet_switching/V2TE4RgU">fast packet switching</a>. Researchers have created some experimental networks to complement the existing Internet.<a class="footnote-ref" id="fnref:287" href="#fn:287">287</a>

<h4>CSNET</h4>
The <a href="/facts/Computer_Science_Network/alJ5aBQq">Computer Science Network</a> (CSNET) was a computer network funded by the NSF that began operation in 1981. Its purpose was to extend networking benefits for <a href="/facts/Computer_science/lN3pEyPz">computer science</a> departments at academic and research institutions that could not be directly connected to <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a> due to funding or authorization limitations. It played a significant role in spreading awareness of, and access to, national networking and was a major milestone on the path to the development of the global <a href="/facts/Internet/Xw1rVvJU">Internet</a>.<a class="footnote-ref" id="fnref:288" href="#fn:288">288</a><a class="footnote-ref" id="fnref:289" href="#fn:289">289</a>

<h4>Internet2</h4>
<a href="/facts/Internet2/APYDGudp">Internet2</a> is a not-for-profit United States <a href="/facts/Computer_network/3w5RM99p">computer networking</a> <a href="/facts/Consortium/uMGVbLps">consortium</a> led by members from the research and education communities, industry, and government.<a class="footnote-ref" id="fnref:290" href="#fn:290">290</a> The Internet2 community, in partnership with <a href="/facts/Qwest/evrR7oDl">Qwest</a>, built the first Internet2 Network, called <a href="/facts/Abilene_Network/njAvcCxy">Abilene</a>, in 1998 and was a prime investor in the <a href="/facts/National_LambdaRail/CEYEVmcT">National LambdaRail</a> (NLR) project.<a class="footnote-ref" id="fnref:291" href="#fn:291">291</a> In 2006, Internet2 announced a partnership with <a href="/facts/Level_3_Communications/jT8epKBt">Level 3 Communications</a> to launch a brand new nationwide network, boosting its capacity from 10 to 100 Gbit/s.<a class="footnote-ref" id="fnref:292" href="#fn:292">292</a> In October, 2007, Internet2 officially retired Abilene and now refers to its new, higher capacity network as the Internet2 Network.

<h4>NSFNET</h4>

The <a href="/facts/National_Science_Foundation_Network/b95QF5hR">National Science Foundation Network</a> (NSFNET) was a program of coordinated, evolving projects sponsored by the NSF beginning in 1985 to promote advanced research and education networking in the United States.<a class="footnote-ref" id="fnref:293" href="#fn:293">293</a> NSFNET was also the name given to several nationwide backbone networks, operating at speeds of 56 kbit/s, 1.5 Mbit/s (T1), and 45 Mbit/s (T3), that were constructed to support NSF's networking initiatives from 1985 to 1995. Initially created to link researchers to the nation's NSF-funded supercomputing centers, through further public funding and private industry partnerships it developed into a major part of the <a href="/facts/Internet_backbone/osqxo7y2">Internet backbone</a>.

<h4>NSFNET regional networks</h4>
In addition to the five NSF supercomputer centers, NSFNET provided connectivity to eleven regional networks and through these networks to many smaller regional and campus networks in the United States. The NSFNET regional networks were:<a class="footnote-ref" id="fnref:294" href="#fn:294">294</a><a class="footnote-ref" id="fnref:295" href="#fn:295">295</a>

<ul><li>BARRNet, the Bay Area Regional Research Network in <a href="/facts/Palo_Alto%2c_California/KJpC7kd8">Palo Alto, California</a>;</li>
<li><a href="/facts/CERFnet/flCwTXJV">CERFnet</a>, California Education and Research Federation Network in <a href="/facts/San_Diego%2c_California/YFUP7gB9">San Diego, California</a>, serving California and Nevada;</li>
<li>CICNet, the <a href="/facts/Committee_on_Institutional_Cooperation/AcwIsNAY">Committee on Institutional Cooperation</a> Network via the Merit Network in <a href="/facts/Ann_Arbor%2c_Michigan/hs3CBRJy">Ann Arbor, Michigan</a> and later as part of the T3 upgrade via <a href="/facts/Argonne_National_Laboratory/EAoR1Rnm">Argonne National Laboratory</a> outside of <a href="/facts/Chicago/yPMokrXH">Chicago</a>, serving the <a href="/facts/Big_Ten/0IzwKheT">Big Ten</a> Universities and the <a href="/facts/University_of_Chicago/z6zRMUmV">University of Chicago</a> in Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin;</li>
<li><a href="/facts/Merit_Network/1qL7oxsn">Merit/MichNet</a> in <a href="/facts/Ann_Arbor%2c_Michigan/hs3CBRJy">Ann Arbor, Michigan</a> serving Michigan, formed in 1966,<a class="footnote-ref" id="fnref:296" href="#fn:296">296</a> still in operation as of 2023<a href="https://en.wikipedia.org/w/index.php?title=Packet_switching&action=edit">[update]</a>;<a class="footnote-ref" id="fnref:297" href="#fn:297">297</a></li>
<li><a href="/facts/MIDnet/MBSx2TcG">MIDnet</a> in <a href="/facts/Lincoln%2c_Nebraska/7PpHa1C4">Lincoln, Nebraska</a> serving Arkansas, Iowa, Kansas, Missouri, Nebraska, Oklahoma, and South Dakota;</li>
<li><a href="/facts/NEARNET/vcGYrJYW">NEARNET</a>, the New England Academic and Research Network in <a href="/facts/Cambridge%2c_Massachusetts/k9UMIJ7U">Cambridge, Massachusetts</a>, added as part of the upgrade to T3, serving Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont, established in late 1988, operated by <a href="/facts/BBN_Technologies/9kA7axL3">BBN</a> under contract to MIT, BBN assumed responsibility for NEARNET on 1 July 1993;<a class="footnote-ref" id="fnref:298" href="#fn:298">298</a></li>
<li>NorthWestNet in <a href="/facts/Seattle%2c_Washington/7lYIrCa6">Seattle, Washington</a>, serving Alaska, Idaho, Montana, North Dakota, Oregon, and Washington, founded in 1987;<a class="footnote-ref" id="fnref:299" href="#fn:299">299</a></li>
<li><a href="/facts/NYSERNet/SSxt8Nyo">NYSERNet</a>, New York State Education and Research Network in <a href="/facts/Ithaca%2c_New_York/mPyMCjEd">Ithaca, New York</a>;</li>
<li>JVNCNet, the John von Neumann National Supercomputer Center Network in <a href="/facts/Princeton%2c_New_Jersey/fceTzdde">Princeton, New Jersey</a>, serving Delaware and New Jersey;</li>
<li>SESQUINET, the Sesquicentennial Network in <a href="/facts/Houston%2c_Texas/1v8AwQUN">Houston, Texas</a>, founded during the 150th anniversary of the State of <a href="/facts/Texas/B987WHF0">Texas</a>;</li>
<li><a href="/facts/SURAnet/FMqGpm7q">SURAnet</a>, the Southeastern Universities Research Association network in <a href="/facts/College_Park%2c_Maryland/EwTcpufP">College Park, Maryland</a> and later as part of the T3 upgrade in <a href="/facts/Atlanta%2c_Georgia/8hPVGb78">Atlanta, Georgia</a> serving Alabama, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, and West Virginia, sold to <a href="/facts/BBN_Technologies/9kA7axL3">BBN</a> in 1994; and</li>
<li>Westnet in <a href="/facts/Salt_Lake_City%2c_Utah/vDHXskTN">Salt Lake City, Utah</a> and <a href="/facts/Boulder%2c_Colorado/nlzuFHN2">Boulder, Colorado</a>, serving Arizona, Colorado, New Mexico, Utah, and Wyoming.</li></ul>
<h4>National LambdaRail</h4>
The <a href="/facts/National_LambdaRail/CEYEVmcT">National LambdaRail</a> (NRL) was launched in September 2003. It is a 12,000-mile high-speed national computer network owned and operated by the US research and education community that runs over fiber-optic lines. It was the first transcontinental <a href="/facts/10_Gigabit_Ethernet/FvxUohpf">10 Gigabit Ethernet</a> network. It operates with an aggregate capacity of up to 1.6 Tbit/s and a 40 Gbit/s bitrate.<a class="footnote-ref" id="fnref:300" href="#fn:300">300</a><a class="footnote-ref" id="fnref:301" href="#fn:301">301</a> NLR ceased operations in March 2014.

<h4>TransPAC2, and TransPAC3</h4>
<a href="/facts/TransPAC2/eRMgQ5Kn">TransPAC2</a> is a high-speed international Internet service connecting research and education networks in the Asia-Pacific region to those in the US.<a class="footnote-ref" id="fnref:302" href="#fn:302">302</a> TransPAC3 is part of the NSF's International Research Network Connections (IRNC) program.<a class="footnote-ref" id="fnref:303" href="#fn:303">303</a>

<h4>Very high-speed Backbone Network Service (vBNS)</h4>
The <a href="/facts/Very_high-speed_Backbone_Network_Service/t2tXNNJF">Very high-speed Backbone Network Service</a> (vBNS) came on line in April 1995 as part of a NSF sponsored project to provide high-speed interconnection between NSF-sponsored <a href="/facts/Supercomputing/HT9NwGAN">supercomputing</a> centers and select access points in the United States.<a class="footnote-ref" id="fnref:304" href="#fn:304">304</a> The network was engineered and operated by <a href="/facts/MCI_Telecommunications/D3MTJGhM">MCI Telecommunications</a> under a cooperative agreement with the NSF. By 1998, the vBNS had grown to connect more than 100 universities and research and engineering institutions via 12 national points of presence with <a href="/facts/DS-3/hfmvrz2m">DS-3</a> (45 Mbit/s), <a href="/facts/OC-3c/GVABpoYY">OC-3c</a> (155 Mbit/s), and <a href="/facts/OC-12/GVABpoYY">OC-12</a> (622 Mbit/s) links on an all OC-12 backbone, a substantial engineering feat for that time. The vBNS installed one of the first ever production <a href="/facts/OC-48/GVABpoYY">OC-48</a> (2.5 Gbit/s) IP links in February 1999 and went on to upgrade the entire backbone to OC-48.<a class="footnote-ref" id="fnref:305" href="#fn:305">305</a>
In June 1999 MCI WorldCom introduced vBNS+ which allowed attachments to the vBNS network by organizations that were not approved by or receiving support from NSF.<a class="footnote-ref" id="fnref:306" href="#fn:306">306</a> After the expiration of the NSF agreement, the vBNS largely transitioned to providing service to the government. Most universities and research centers migrated to the Internet2 educational backbone. In January 2006, when <a href="/facts/MCI_Inc./sxFMcxef">MCI</a> and <a href="/facts/Verizon/8WkoRAUM">Verizon</a> merged,<a class="footnote-ref" id="fnref:307" href="#fn:307">307</a> vBNS+ became a service of <a href="/facts/Verizon_Business/KwR8aGo3">Verizon Business</a>.<a class="footnote-ref" id="fnref:308" href="#fn:308">308</a>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Multi-bearer_network/CV5S8of6">Multi-bearer network</a></li>
<li><a href="/facts/Optical_burst_switching/mQ2U7xLB">Optical burst switching</a></li>
<li><a href="/facts/Packet_radio/90L290N1">Packet radio</a></li>
<li><a href="/facts/Transmission_delay/kvtQ8glB">Transmission delay</a></li>
<li><a href="/facts/Virtual_private_network/HX1WUQ3E">Virtual private network</a></li></ul>

<h3>Bibliography</h3>
<ul><li>Abbate, Janet (2000). <a href="https://archive.org/details/inventinginterne00jane">Inventing the Internet</a>. MIT Press. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 9780262511155.</li>
<li>Gillies, James; Cailliau, Robert (2000). How the Web was born : the story of the World Wide Web. Oxford: Oxford University Press. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0-19-286207-3. <a href="/facts/OCLC_(identifier)/Yqad8waq">OCLC</a> <a href="https://search.worldcat.org/oclc/43377073">43377073</a>.</li>
<li>Hafner, Katie (1996). <a href="https://books.google.com/books?id=8TEjhArXaBsC&q=editions:jQP_fBq3Mr4C">Where Wizards Stay Up Late</a>. Simon and Schuster. pp. 52–67. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 9780684832678.</li>
<li>Norberg, Arthur; O'Neill, Judy E. (2000). Transforming Computer Technology: Information Processing for the Pentagon, 1962-1982. Johns Hopkins University. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0801863691.</li>
<li>Moschovitis, Christos J. P. (1999). <a href="https://archive.org/details/historyofinterne0000unse">History of the Internet: A Chronology, 1843 to the Present</a>. ABC-CLIO. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-57607-118-2.</li>
<li>Lawrence Roberts, <a href="https://web.archive.org/web/20160324033133/http://www.packet.cc/files/ev-packet-sw.html">The Evolution of Packet Switching</a> (Proceedings of the IEEE, November, 1978)</li></ul>
<h3>Primary sources</h3>
<ul><li>Paul Baran et al., <a href="http://www.rand.org/about/history/baran-list.html">On Distributed Communications, Volumes I-XI</a> <a href="https://web.archive.org/web/20110329223245/http://www.rand.org/about/history/baran-list.html">Archived</a> 2011-03-29 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a> (RAND Corporation Research Documents, August, 1964)</li>
<li>Paul Baran, <a href="http://www.rand.org/publications/RM/RM3420/">On Distributed Communications: I Introduction to Distributed Communications Network</a> (RAND Memorandum RM-3420-PR. August 1964)</li>
<li>Paul Baran, <a href="http://www.cs.ucla.edu/classes/cs217/Baran64.pdf">On Distributed Communications Networks</a>, (<a href="/facts/IEEE/UddC4pUW">IEEE</a> Transactions on Communications Systems, Vol. CS-12 No. 1, pp. 1–9, March 1964)</li>
<li>D. W. Davies, K. A. Bartlett, R. A. Scantlebury, and P. T. Wilkinson, A digital communications network for computers giving rapid response at remote terminals (ACM Symposium on Operating Systems Principles. October 1967)</li>
<li>R. A. Scantlebury, P. T. Wilkinson, and K. A. Bartlett, <a href="https://researchr.org/publication/ScantleburyWB68">The design of a message switching Centre for a digital communication network</a> (IFIP 1968)</li></ul>
<h2 id="further-reading">Further reading</h2>
<ul><li>Pelkey, James L.; Russell, Andrew L.; Robbins, Loring G. (2022). Circuits, Packets, and Protocols: Entrepreneurs and Computer Communications, 1968-1988. Morgan & Claypool. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4503-9729-2.</li>
<li>Russell, Andrew L. (2014). Open Standards and the Digital Age: History, Ideology, and Networks. Cambridge University Press. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-139-91661-5.</li></ul>
<h2 id="external-links">External links</h2>
<ul><li>Wilkinson, Peter (Summer 2020), <a href="https://www.computerconservationsociety.org/resurrection/res90.htm#c">"Packet Switching and the NPL Network"</a>, Computer Resurrection: The Journal of the Computer Conservation Society (90), <a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://search.worldcat.org/issn/0958-7403">0958-7403</a></li>
<li><a href="http://purl.umn.edu/107101">Oral history interview with Paul Baran</a>. <a href="/facts/Charles_Babbage_Institute/7CbplQuX">Charles Babbage Institute</a> University of Minnesota, Minneapolis. Baran describes his working environment at RAND, as well as his initial interest in survivable communications, and the evolution, writing and distribution of his eleven-volume work, "On Distributed Communications". Baran discusses his interaction with the group at ARPA who were responsible for the later development of the ARPANET.</li>
<li><a href="https://www.youtube.com/watch?v=L_ojeeTIqFM&index=29&list=PL59D1CD3E3C7C070F">NPL Data Communications Network</a> NPL video, 1970s</li>
<li><a href="http://www.livinginternet.com/i/iw_packet.htm">Packet Switching History and Design</a>, site reviewed by Baran, Roberts, and Kleinrock</li>
<li><a href="http://www.rand.org/about/history/baran.html">Paul Baran and the Origins of the Internet</a></li>
<li><a href="https://web.archive.org/web/20090801003519/http://www.rogerdmoore.ca/PS/">20+ articles on packet switching in the 1970s</a>, archived from <a href="http://www.rogerdmoore.ca/PS">the original</a> on 2009-08-01</li>
<li><a href="http://www.phrack.org/issues.html?issue=18&id=3#article">"An Introduction to Packet Switched Networks"</a>. <a href="/facts/Phrack/guwr8z5E">Phrack</a>. May 3, 1988. <a href="https://web.archive.org/web/20231204132134/http://phrack.org/issues/18/3.html">Archived</a> from the original on 2023-12-04.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">Weik, Martin (6 December 2012). Fiber Optics Standard Dictionary. Springer Science & Business Media. ISBN 978-1461560234. <a href="978-1461560234" target="_blank">978-1461560234</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">National Telecommunication Information Administration (1 April 1997). Telecommunications: Glossary of Telecommunications Terms. Vol. 1037, Part 3 of Federal Standard. Government Institutes. ISBN 1461732328. <a href="1461732328" target="_blank">1461732328</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">Forouzan, Behrouz A.; Fegan, Sophia Chung (2007). Data Communications and Networking. Huga Media. ISBN 978-0-07-296775-3. <a href="978-0-07-296775-3" target="_blank">978-0-07-296775-3</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">"The real story of how the Internet became so vulnerable". Washington Post. Archived from the original on 2015-05-30. Retrieved 2020-02-18. Historians credit seminal insights to Welsh scientist Donald W. Davies and American engineer Paul Baran <a href="https://web.archive.org/web/20150530231409/http://www.washingtonpost.com/sf/business/2015/05/30/net-of-insecurity-part-1/" target="_blank">https://web.archive.org/web/20150530231409/http://www.washingtonpost.com/sf/business/2015/05/30/net-of-insecurity-part-1/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">Pelkey, James L.; Russell, Andrew L.; Robbins, Loring G. (2022). Circuits, Packets, and Protocols: Entrepreneurs and Computer Communications, 1968-1988 (PDF). Morgan & Claypool. p. 4. ISBN 978-1-4503-9729-2. Paul Baran, an engineer celebrated as the co-inventor (along with Donald Davies) of the packet switching technology that is the foundation of digital networks <a href="978-1-4503-9729-2" target="_blank">978-1-4503-9729-2</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">"Inductee Details - Paul Baran". National Inventors Hall of Fame. Retrieved 6 September 2017; "Inductee Details - Donald Watts Davies". National Inventors Hall of Fame. Retrieved 6 September 2017. <a href="https://www.invent.org/inductees/paul-baran" target="_blank">https://www.invent.org/inductees/paul-baran</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Edmondson-Yurkanan, Chris (2007). "SIGCOMM's archaeological journey into networking's past". Communications of the ACM. 50 (5): 63–68. doi:10.1145/1230819.1230840. ISSN 0001-0782. The 1960 challenge was to build a network such that a significant subset of the network could survive a military attack. [Baran] told us he knew he could design a solution once he realized that, 'given redundant paths, the reliability of the net work could be greater than the reliability of the parts.' ... In his first draft dated Nov. 10, 1965, Davies forecast today's 'killer app' for his new communication service: 'The greatest traffic could only come if the public used this means for everyday purposes such as shopping... People sending enquiries and placing orders for goods of all kinds will make up a large section of the traffic... Business use of the telephone may be reduced by the growth of the kind of service we contemplate.' <a href="https://dl.acm.org/doi/10.1145/1230819.1230840" target="_blank">https://dl.acm.org/doi/10.1145/1230819.1230840</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">Stewart, Bill (2000-01-07). "Paul Baran Invents Packet Switching". Living Internet. Retrieved 2008-05-08. <a href="http://www.livinginternet.com/i/ii_rand.htm" target="_blank">http://www.livinginternet.com/i/ii_rand.htm</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">Baran, Paul (2002). "The beginnings of packet switching: some underlying concepts" (PDF). IEEE Communications Magazine. 40 (7): 42–48. doi:10.1109/MCOM.2002.1018006. ISSN 0163-6804. Archived (PDF) from the original on 2022-10-10. Essentially all the work was defined by 1961, and fleshed out and put into formal written form in 1962. The idea of hot potato routing dates from late 1960. <a href="http://web.cs.ucla.edu/~lixia/papers/Baran2002.pdf" target="_blank">http://web.cs.ucla.edu/~lixia/papers/Baran2002.pdf</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">Baran, Paul (May 27, 1960). "Reliable Digital Communications Using Unreliable Network Repeater Nodes" (PDF). The RAND Corporation: 1. Archived (PDF) from the original on 2022-10-10. Retrieved July 7, 2016. <a href="http://www.rand.org/content/dam/rand/pubs/papers/2008/P1995.pdf" target="_blank">http://www.rand.org/content/dam/rand/pubs/papers/2008/P1995.pdf</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">Stewart, Bill (2000-01-07). "Paul Baran Invents Packet Switching". Living Internet. Retrieved 2008-05-08. <a href="http://www.livinginternet.com/i/ii_rand.htm" target="_blank">http://www.livinginternet.com/i/ii_rand.htm</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">Baran, Paul (1962). "RAND Paper P-2626". <a href="http://www.rand.org/pubs/papers/P2626/" target="_blank">http://www.rand.org/pubs/papers/P2626/</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">Baran, Paul (January 1964). "On Distributed Communications". <a href="http://www.rand.org/pubs/research_memoranda/RM3420/index.html" target="_blank">http://www.rand.org/pubs/research_memoranda/RM3420/index.html</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">Baran, Paul (2002). "The beginnings of packet switching: some underlying concepts" (PDF). IEEE Communications Magazine. 40 (7): 42–48. doi:10.1109/MCOM.2002.1018006. ISSN 0163-6804. Archived (PDF) from the original on 2022-10-10. Essentially all the work was defined by 1961, and fleshed out and put into formal written form in 1962. The idea of hot potato routing dates from late 1960. <a href="http://web.cs.ucla.edu/~lixia/papers/Baran2002.pdf" target="_blank">http://web.cs.ucla.edu/~lixia/papers/Baran2002.pdf</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
<li id="fn:15">"Paul Baran and the Origins of the Internet". RAND Corporation. Retrieved 2020-02-15. <a href="https://www.rand.org/about/history/baran.html" target="_blank">https://www.rand.org/about/history/baran.html</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></li>
<li id="fn:16">Pelkey, James L. "6.1 The Communications Subnet: BBN 1969". Entrepreneurial Capitalism and Innovation: A History of Computer Communications 1968–1988. As Kahn recalls: ... Paul Baran's contributions ... I also think Paul was motivated almost entirely by voice considerations. If you look at what he wrote, he was talking about switches that were low-cost electronics. The idea of putting powerful computers in these locations hadn't quite occurred to him as being cost effective. So the idea of computer switches was missing. The whole notion of protocols didn't exist at that time. And the idea of computer-to-computer communications was really a secondary concern. <a href="https://historyofcomputercommunications.info/section/6.1/the-communications-subnet-bbn-1969/" target="_blank">https://historyofcomputercommunications.info/section/6.1/the-communications-subnet-bbn-1969/</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">Waldrop, M. Mitchell (2018). The Dream Machine. Stripe Press. p. 286. ISBN 978-1-953953-36-0. Baran had put more emphasis on digital voice communications than on computer communications. <a href="978-1-953953-36-0" target="_blank">978-1-953953-36-0</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
<li id="fn:18">Kleinrock, L. (1978). "Principles and lessons in packet communications". Proceedings of the IEEE. 66 (11): 1320–1329. doi:10.1109/PROC.1978.11143. ISSN 0018-9219. Paul Baran ... focused on the routing procedures and on the survivability of distributed communication systems in a hostile environment, but did not concentrate on the need for resource sharing in its form as we now understand it; indeed, the concept of a software switch was not present in his work. <a href="https://ieeexplore.ieee.org/document/1455412" target="_blank">https://ieeexplore.ieee.org/document/1455412</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></li>
<li id="fn:19">"Computer Pioneers - Christopher Strachey". history.computer.org. Retrieved 2020-01-23. <a href="https://history.computer.org/pioneers/strachey.html" target="_blank">https://history.computer.org/pioneers/strachey.html</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></li>
<li id="fn:20">"Computer - Time-sharing, Minicomputers, Multitasking". Britannica. Retrieved 2023-07-23. <a href="https://www.britannica.com/technology/computer/Time-sharing-and-minicomputers" target="_blank">https://www.britannica.com/technology/computer/Time-sharing-and-minicomputers</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></li>
<li id="fn:21">Corbató, F. J.; et al. (1963). The Compatible Time-Sharing System: A Programmer's Guide (PDF). MIT Press. ISBN 978-0-262-03008-3. {{cite book}}: ISBN / Date incompatibility (help). "the first paper on time-shared computers by C. Strachey at the June 1959 UNESCO Information Processing conference". <a href="978-0-262-03008-3" target="_blank">978-0-262-03008-3</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></li>
<li id="fn:22">Gillies & Cailliau 2000, p. 13 - Gillies, James; Cailliau, Robert (2000). How the Web was born : the story of the World Wide Web. Oxford: Oxford University Press. ISBN 0-19-286207-3. OCLC 43377073. <a href="https://search.worldcat.org/oclc/43377073" target="_blank">https://search.worldcat.org/oclc/43377073</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></li>
<li id="fn:23">Roberts, Dr. Lawrence G. (November 1978). "The Evolution of Packet Switching". Archived from the original on 24 March 2016. Retrieved 5 September 2017. <a href="https://web.archive.org/web/20160324033133/http://www.packet.cc/files/ev-packet-sw.html" target="_blank">https://web.archive.org/web/20160324033133/http://www.packet.cc/files/ev-packet-sw.html</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></li>
<li id="fn:24">Roberts, Dr. Lawrence G. (May 1995). "The ARPANET & Computer Networks". Archived from the original on 24 March 2016. Retrieved 13 April 2016. <a href="https://web.archive.org/web/20160324032800/http://www.packet.cc/files/arpanet-computernet.html" target="_blank">https://web.archive.org/web/20160324032800/http://www.packet.cc/files/arpanet-computernet.html</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></li>
<li id="fn:25">Roberts, Gareth Ffowc (2022). For the Recorde: A History of Welsh Mathematical Greats. University of Wales Press. ISBN 978-1-78683-917-6. Mathematicians had already developed methods of analysing traffic jams - 'queueing theory' ... - but it needed new a insight to solve the problem of how to avoid bottle-necks between computers. <a href="978-1-78683-917-6" target="_blank">978-1-78683-917-6</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></li>
<li id="fn:26">Pelkey, James L. (May 27, 1988). "Interview of Donald Davies" (PDF). <a href="http://archive.computerhistory.org/resources/access/text/2017/11/102738594-05-01-acc.pdf" target="_blank">http://archive.computerhistory.org/resources/access/text/2017/11/102738594-05-01-acc.pdf</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></li>
<li id="fn:27">Davies, D. W. (1966). "Proposal for a Digital Communication Network" (PDF). all users of the network will provide themselves with some kind of error control ... Computer developments in the distant future might result in one type of network being able to carry speech and digital messages efficiently. <a href="https://www.dcs.gla.ac.uk/~wpc/grcs/Davies05.pdf" target="_blank">https://www.dcs.gla.ac.uk/~wpc/grcs/Davies05.pdf</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></li>
<li id="fn:28">Scantlebury, R. A.; Bartlett, K. A. (April 1967), A Protocol for Use in the NPL Data Communications Network, Private papers <a href="#fnref:28" class="footnote-back-ref">↩</a></li>
<li id="fn:29">Davies, Donald; Bartlett, Keith; Scantlebury, Roger; Wilkinson, Peter (October 1967). A Digital Communication Network for Computers Giving Rapid Response at remote Terminals (PDF). ACM Symposium on Operating Systems Principles. Archived (PDF) from the original on 2022-10-10. Retrieved 2020-09-15. <a href="https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf" target="_blank">https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></li>
<li id="fn:30">Yates, David M. (1997). Turing's Legacy: A History of Computing at the National Physical Laboratory 1945-1995. National Museum of Science and Industry. p. 130. ISBN 978-0-901805-94-2. <a href="978-0-901805-94-2" target="_blank">978-0-901805-94-2</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></li>
<li id="fn:31">Davies, D. W. (17 March 1986), Oral History 189: D. W. Davies interviewed by Martin Campbell-Kelly at the National Physical Laboratory, Charles Babbage Institute University of Minnesota, Minneapolis, archived from the original on 29 July 2014, retrieved 21 July 2014 <a href="/wiki/Donald_Davies" target="_blank">/wiki/Donald_Davies</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></li>
<li id="fn:32">"UK National Physical Laboratories, Donald Davies". LivingInternet. Retrieved 2024-06-05. <a href="https://www.livinginternet.com/i/ii_npl.htm" target="_blank">https://www.livinginternet.com/i/ii_npl.htm</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></li>
<li id="fn:33">Davies, Donald; Bartlett, Keith; Scantlebury, Roger; Wilkinson, Peter (October 1967). A Digital Communication Network for Computers Giving Rapid Response at remote Terminals (PDF). ACM Symposium on Operating Systems Principles. Archived (PDF) from the original on 2022-10-10. Retrieved 2020-09-15. <a href="https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf" target="_blank">https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></li>
<li id="fn:34">Hafner, Katie; Lyon, Matthew (1996). Where wizards stay up late: the origins of the Internet. Internet Archive. Simon & Schuster. pp. 76–78. ISBN 978-0-684-81201-4. Roger Scantlebury ... from Donald Davies' team ... presented a detailed design study for a packet switched network. It was the first Roberts had heard of it. ... Roberts also learned from Scantlebury, for the first time, of the work that had been done by Paul Baran at RAND a few years earlier. <a href="978-0-684-81201-4" target="_blank">978-0-684-81201-4</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></li>
<li id="fn:35">Moschovitis 1999, p. 58-9 More significantly, Roger Scantlebury ... presents the design for a packet-switched network. This is the first Roberts and Taylor have heard of packet switching, a concept that appears to be a promising receipe for transmitting data through the ARPAnet. - Moschovitis, Christos J. P. (1999). History of the Internet: A Chronology, 1843 to the Present. ABC-CLIO. ISBN 978-1-57607-118-2. <a href="https://archive.org/details/historyofinterne0000unse" target="_blank">https://archive.org/details/historyofinterne0000unse</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></li>
<li id="fn:36">Hempstead, C.; Worthington, W., eds. (2005). Encyclopedia of 20th-Century Technology. Vol. 1, A–L. Routledge. p. 574. ISBN 9781135455514. It was a seminal meeting as the NPL proposal illustrated how the communications for such a resource-sharing computer network could be realized. <a href="9781135455514" target="_blank">9781135455514</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></li>
<li id="fn:37">"On packet switching". Net History. Retrieved 2024-01-08. [Scantlebury said] We referenced Baran's paper in our 1967 Gatlinburg ACM paper. You will find it in the References. Therefore I am sure that we introduced Baran's work to Larry (and hence the BBN guys). <a href="https://www.nethistory.info/Archives/packets.html" target="_blank">https://www.nethistory.info/Archives/packets.html</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></li>
<li id="fn:38">Naughton, John (2015). A Brief History of the Future: The origins of the Internet. Hachette. ISBN 978-1474602778. they lacked one vital ingredient. Since none of them had heard of Paul Baran they had no serious idea of how to make the system work. And it took an English outfit to tell them. ... Larry Roberts paper was the first public presentation of the ARPANET concept as conceived with the aid of Wesley Clark ... Looking at it now, Roberts paper seems extraordinarily, well, vague. <a href="978-1474602778" target="_blank">978-1474602778</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></li>
<li id="fn:39">Waldrop, M. Mitchell (2018). The Dream Machine. Stripe Press. pp. 285–6. ISBN 978-1-953953-36-0. Scantlebury and his companions from the NPL group were happy to sit up with Roberts all that night, sharing technical details and arguing over the finer points. <a href="978-1-953953-36-0" target="_blank">978-1-953953-36-0</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></li>
<li id="fn:40">Abbate, Jane (2000). Inventing the Internet. MIT Press. pp. 37–8, 58–9. ISBN 978-0262261333. The NPL group influenced a number of American computer scientists in favor of the new technique, and they adopted Davies's term "packet switching" to refer to this type of network. Roberts also adopted some specific aspects of the NPL design. <a href="978-0262261333" target="_blank">978-0262261333</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></li>
<li id="fn:41">"Oral-History:Donald Davies & Derek Barber". Retrieved 13 April 2016. the ARPA network is being implemented using existing telegraphic techniques simply because the type of network we describe does not exist. It appears that the ideas in the NPL paper at this moment are more advanced than any proposed in the USA <a href="http://ethw.org/Oral-History:Donald_Davies_%26_Derek_Barber" target="_blank">http://ethw.org/Oral-History:Donald_Davies_%26_Derek_Barber</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></li>
<li id="fn:42">Barber, Derek (Spring 1993). "The Origins of Packet Switching". The Bulletin of the Computer Conservation Society (5). ISSN 0958-7403. Retrieved 6 September 2017. Roger actually convinced Larry that what he was talking about was all wrong and that the way that NPL were proposing to do it was right. I've got some notes that say that first Larry was sceptical but several of the others there sided with Roger and eventually Larry was overwhelmed by the numbers. <a href="http://www.cs.man.ac.uk/CCS/res/res05.htm#f" target="_blank">http://www.cs.man.ac.uk/CCS/res/res05.htm#f</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></li>
<li id="fn:43">Needham, Roger M. (2002-12-01). "Donald Watts Davies, C.B.E. 7 June 1924 – 28 May 2000". Biographical Memoirs of Fellows of the Royal Society. 48: 87–96. doi:10.1098/rsbm.2002.0006. S2CID 72835589. Larry Roberts presented a paper on early ideas for what was to become ARPAnet. This was based on a store-and-forward method for entire messages, but as a result of that meeting the NPL work helped to convince Roberts that packet switching was the way forward. <a href="https://royalsocietypublishing.org/doi/10.1098/rsbm.2002.0006" target="_blank">https://royalsocietypublishing.org/doi/10.1098/rsbm.2002.0006</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></li>
<li id="fn:44">Davies, Donald; Bartlett, Keith; Scantlebury, Roger; Wilkinson, Peter (October 1967). A Digital Communication Network for Computers Giving Rapid Response at remote Terminals (PDF). ACM Symposium on Operating Systems Principles. Archived (PDF) from the original on 2022-10-10. Retrieved 2020-09-15. <a href="https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf" target="_blank">https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></li>
<li id="fn:45">Rayner, David; Barber, Derek; Scantlebury, Roger; Wilkinson, Peter (2001). NPL, Packet Switching and the Internet. Symposium of the Institution of Analysts & Programmers 2001. Archived from the original on 2003-08-07. Retrieved 2024-06-13. The system first went 'live' early in 1969 <a href="https://web.archive.org/web/20030807200346/http://www.topquark.co.uk/conf/IAP2001.html" target="_blank">https://web.archive.org/web/20030807200346/http://www.topquark.co.uk/conf/IAP2001.html</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></li>
<li id="fn:46">John S, Quarterman; Josiah C, Hoskins (1986). "Notable computer networks". Communications of the ACM. 29 (10): 932–971. doi:10.1145/6617.6618. S2CID 25341056. The first packet-switching network was implemented at the National Physical Laboratories in the United Kingdom. It was quickly followed by the ARPANET in 1969. <a href="https://doi.org/10.1145%2F6617.6618" target="_blank">https://doi.org/10.1145%2F6617.6618</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></li>
<li id="fn:47">Haughney Dare-Bryan, Christine (June 22, 2023). Computer Freaks (Podcast). Chapter Two: In the Air. Inc. Magazine. 35:55 minutes in. Leonard Kleinrock: Donald Davies ... did make a single node packet switch before ARPA did <a href="https://www.inc.com/computerfreaks" target="_blank">https://www.inc.com/computerfreaks</a> <a href="#fnref:47" class="footnote-back-ref">↩</a></li>
<li id="fn:48">C. Hempstead; W. Worthington (2005). Encyclopedia of 20th-Century Technology. Routledge. pp. 573–5. ISBN 9781135455514. <a href="9781135455514" target="_blank">9781135455514</a> <a href="#fnref:48" class="footnote-back-ref">↩</a></li>
<li id="fn:49">Campbell-Kelly, Martin (1987). "Data Communications at the National Physical Laboratory (1965-1975)". Annals of the History of Computing. 9 (3/4): 221–247. doi:10.1109/MAHC.1987.10023. S2CID 8172150. <a href="https://archive.org/details/DataCommunicationsAtTheNationalPhysicalLaboratory" target="_blank">https://archive.org/details/DataCommunicationsAtTheNationalPhysicalLaboratory</a> <a href="#fnref:49" class="footnote-back-ref">↩</a></li>
<li id="fn:50">Needham, R. M. (2002). "Donald Watts Davies, C.B.E. 7 June 1924 – 28 May 2000". Biographical Memoirs of Fellows of the Royal Society. 48: 87–96. doi:10.1098/rsbm.2002.0006. S2CID 72835589. The 1967 Gatlinburg paper was influential on the development of ARPAnet, which might otherwise have been built with less extensible technology. ... Davies was invited to Japan to lecture on packet switching. <a href="/wiki/Roger_Needham" target="_blank">/wiki/Roger_Needham</a> <a href="#fnref:50" class="footnote-back-ref">↩</a></li>
<li id="fn:51">C. Hempstead; W. Worthington (2005). Encyclopedia of 20th-Century Technology. Routledge. pp. 573–5. ISBN 9781135455514. <a href="9781135455514" target="_blank">9781135455514</a> <a href="#fnref:51" class="footnote-back-ref">↩</a></li>
<li id="fn:52">Clarke, Peter (1982). Packet and circuit-switched data networks (PDF) (PhD thesis). Department of Electrical Engineering, Imperial College of Science and Technology, University of London. "As well as the packet switched network actually built at NPL for communication between their local computing facilities, some simulation experiments have been performed on larger networks. A summary of this work is reported in [69]. The work was carried out to investigate networks of a size capable of providing data communications facilities to most of the U.K. ... Experiments were then carried out using a method of flow control devised by Davies [70] called 'isarithmic' flow control. ... The simulation work carried out at NPL has, in many respects, been more realistic than most of the ARPA network theoretical studies." <a href="https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf" target="_blank">https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf</a> <a href="#fnref:52" class="footnote-back-ref">↩</a></li>
<li id="fn:53">Pelkey, James. "6.3 CYCLADES Network and Louis Pouzin 1971-1972". Entrepreneurial Capitalism and Innovation: A History of Computer Communications 1968-1988. Archived from the original on 2021-06-17. Retrieved 2020-02-03. <a href="https://web.archive.org/web/20210617093154/https://www.historyofcomputercommunications.info/Book/6/6.3-CYCLADESNetworkLouisPouzin1-72.html" target="_blank">https://web.archive.org/web/20210617093154/https://www.historyofcomputercommunications.info/Book/6/6.3-CYCLADESNetworkLouisPouzin1-72.html</a> <a href="#fnref:53" class="footnote-back-ref">↩</a></li>
<li id="fn:54">Campbell-Kelly, Martin (Autumn 2008). "Pioneer Profiles: Donald Davies". Computer Resurrection (44). ISSN 0958-7403. <a href="http://www.computerconservationsociety.org/resurrection/res44.htm" target="_blank">http://www.computerconservationsociety.org/resurrection/res44.htm</a> <a href="#fnref:54" class="footnote-back-ref">↩</a></li>
<li id="fn:55">Wilkinson, Peter (2001). NPL Development of Packet Switching. Symposium of the Institution of Analysts & Programmers 2001. Archived from the original on 2003-08-07. Retrieved 2024-06-13. The feasibility studies continued with an attempt to apply queuing theory to study overall network performance. This proved to be intractable so we quickly turned to simulation. <a href="https://web.archive.org/web/20030807200346/http://www.topquark.co.uk/conf/IAP2001.html" target="_blank">https://web.archive.org/web/20030807200346/http://www.topquark.co.uk/conf/IAP2001.html</a> <a href="#fnref:55" class="footnote-back-ref">↩</a></li>
<li id="fn:56">Hafner, Katie (2018-12-30). "Lawrence Roberts, Who Helped Design Internet's Precursor, Dies at 81". The New York Times. ISSN 0362-4331. Retrieved 2020-02-20. He decided to use packet switching as the underlying technology of the Arpanet; it remains central to the function of the internet. And it was Dr. Roberts's decision to build a network that distributed control of the network across multiple computers. Distributed networking remains another foundation of today's internet. <a href="https://www.nytimes.com/2018/12/30/obituaries/lawrence-g-roberts-dies-at-81.html" target="_blank">https://www.nytimes.com/2018/12/30/obituaries/lawrence-g-roberts-dies-at-81.html</a> <a href="#fnref:56" class="footnote-back-ref">↩</a></li>
<li id="fn:57">Waldrop, M. Mitchell (2018). The Dream Machine. Stripe Press. pp. 285–6. ISBN 978-1-953953-36-0. Oops. Roberts knew Baran slightly and had in fact had lunch with him during a visit to RAND the previous February. But he certainly didn't remember any discussion of networks. How could he have missed something like that? <a href="978-1-953953-36-0" target="_blank">978-1-953953-36-0</a> <a href="#fnref:57" class="footnote-back-ref">↩</a></li>
<li id="fn:58">O'Neill, Judy (5 March 1990). "An Interview with PAUL BARAN" (PDF). p. 37. On Tuesday, 28 February 1967 I find a notation on my calendar for 12:00 noon Dr. L. Roberts. <a href="https://conservancy.umn.edu/bitstream/handle/11299/107101/oh182pb.pdf?sequence=1&isAllowed=y" target="_blank">https://conservancy.umn.edu/bitstream/handle/11299/107101/oh182pb.pdf?sequence=1&isAllowed=y</a> <a href="#fnref:58" class="footnote-back-ref">↩</a></li>
<li id="fn:59">Pelkey, James. "4.7 Planning the ARPANET: 1967-1968 in Chapter 4 - Networking: Vision and Packet Switching 1959 - 1968". The History of Computer Communications. Archived from the original on December 23, 2022. Retrieved May 9, 2023. <a href="https://web.archive.org/web/20221223230647/https://historyofcomputercommunications.info/section/4.7/planning-the-arpanet-1967-1968/" target="_blank">https://web.archive.org/web/20221223230647/https://historyofcomputercommunications.info/section/4.7/planning-the-arpanet-1967-1968/</a> <a href="#fnref:59" class="footnote-back-ref">↩</a></li>
<li id="fn:60">Press, Gil (January 2, 2015). "A Very Short History Of The Internet And The Web". Forbes. Archived from the original on January 9, 2015. Retrieved 2020-02-07. Roberts' proposal that all host computers would connect to one another directly ... was not endorsed ... Wesley Clark ... suggested to Roberts that the network be managed by identical small computers, each attached to a host computer. Accepting the idea, Roberts named the small computers dedicated to network administration 'Interface Message Processors' (IMPs), which later evolved into today's routers. <a href="https://www.forbes.com/sites/gilpress/2015/01/02/a-very-short-history-of-the-internet-and-the-web-2/" target="_blank">https://www.forbes.com/sites/gilpress/2015/01/02/a-very-short-history-of-the-internet-and-the-web-2/</a> <a href="#fnref:60" class="footnote-back-ref">↩</a></li>
<li id="fn:61">SRI Project 5890-1; Networking (Reports on Meetings), Stanford University, 1967, archived from the original on February 2, 2020, retrieved 2020-02-15, W. Clark's message switching proposal (appended to Taylor's letter of April 24, 1967 to Engelbart)were reviewed. <a href="https://web.archive.org/web/20200202062940/https://web.stanford.edu/dept/SUL/library/extra4/sloan/mousesite/EngelbartPapers/B1_F20_CompuMtg.html" target="_blank">https://web.archive.org/web/20200202062940/https://web.stanford.edu/dept/SUL/library/extra4/sloan/mousesite/EngelbartPapers/B1_F20_CompuMtg.html</a> <a href="#fnref:61" class="footnote-back-ref">↩</a></li>
<li id="fn:62">Roberts, Lawrence (1967). "Multiple computer networks and intercomputer communication" (PDF). Multiple Computer Networks and Intercomputer Communications. pp. 3.1 – 3.6. doi:10.1145/800001.811680. S2CID 17409102. Thus the set of IMP's, plus the telephone lines and data sets would constitute a message switching network <a href="https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/arpanet.pdf" target="_blank">https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/arpanet.pdf</a> <a href="#fnref:62" class="footnote-back-ref">↩</a></li>
<li id="fn:63">Tanenbaum, Andrew S.; Wetherall, David (2011). Computer networks (PDF) (5th ed.). Boston Amsterdam: Prentice Hall. p. 57. ISBN 978-0-13-212695-3. Roberts bought the idea and presented a some what vague paper about it at the ACM SIGOPS Symposium on Operating System Principles held in Gatlinburg, Tennessee in late 1967 <a href="978-0-13-212695-3" target="_blank">978-0-13-212695-3</a> <a href="#fnref:63" class="footnote-back-ref">↩</a></li>
<li id="fn:64">Waldrop, M. Mitchell (2018). The Dream Machine. Stripe Press. pp. 279, 284–5. ISBN 978-1-953953-36-0. Roberts was already becoming known as the fastest man in the Pentagon. ... And not for nothing was Larry Roberts known as the fastest man in the Pentagon. By the time they got to the airport, the decision had been made .... Once again, the fastest man in the Pentagon made his decision without hesitation <a href="978-1-953953-36-0" target="_blank">978-1-953953-36-0</a> <a href="#fnref:64" class="footnote-back-ref">↩</a></li>
<li id="fn:65">Abbate, Jane (2000). Inventing the Internet. MIT Press. pp. 37–8, 58–9. ISBN 978-0262261333. The NPL group influenced a number of American computer scientists in favor of the new technique, and they adopted Davies's term "packet switching" to refer to this type of network. Roberts also adopted some specific aspects of the NPL design. <a href="978-0262261333" target="_blank">978-0262261333</a> <a href="#fnref:65" class="footnote-back-ref">↩</a></li>
<li id="fn:66">"Shapiro: Computer Network Meeting of October 9–10, 1967". stanford.edu. Archived from the original on 27 June 2015. <a href="https://web.archive.org/web/20150627133802/https://web.stanford.edu/dept/SUL/library/extra4/sloan/mousesite/Archive/Post68/ARPANETMeeting1167.html" target="_blank">https://web.archive.org/web/20150627133802/https://web.stanford.edu/dept/SUL/library/extra4/sloan/mousesite/Archive/Post68/ARPANETMeeting1167.html</a> <a href="#fnref:66" class="footnote-back-ref">↩</a></li>
<li id="fn:67">"Computer Pioneers - Donald W. Davies". IEEE Computer Society. Retrieved 2020-02-20. In 1965, Davies pioneered new concepts for computer communications in a form to which he gave the name "packet switching." ... The design of the ARPA network (ArpaNet) was entirely changed to adopt this technique. <a href="https://history.computer.org/pioneers/davies.html" target="_blank">https://history.computer.org/pioneers/davies.html</a> <a href="#fnref:67" class="footnote-back-ref">↩</a></li>
<li id="fn:68">"Pioneer: Donald Davies", Internet Hall of Fame "America’s Advanced Research Project Agency (ARPA), and the ARPANET received his network design enthusiastically and the NPL local network became the first two computer networks in the world using the technique." <a href="http://www.internethalloffame.org/inductees/donald-davies" target="_blank">http://www.internethalloffame.org/inductees/donald-davies</a> <a href="#fnref:68" class="footnote-back-ref">↩</a></li>
<li id="fn:69">Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon and Schuster. p. 246. ISBN 9781476708690. <a href="9781476708690" target="_blank">9781476708690</a> <a href="#fnref:69" class="footnote-back-ref">↩</a></li>
<li id="fn:70">Davies, D. W. (1966). "Proposal for a Digital Communication Network" (PDF). all users of the network will provide themselves with some kind of error control ... Computer developments in the distant future might result in one type of network being able to carry speech and digital messages efficiently. <a href="https://www.dcs.gla.ac.uk/~wpc/grcs/Davies05.pdf" target="_blank">https://www.dcs.gla.ac.uk/~wpc/grcs/Davies05.pdf</a> <a href="#fnref:70" class="footnote-back-ref">↩</a></li>
<li id="fn:71">Davies, D. W. (1966). "Proposal for a Digital Communication Network" (PDF). p. 10, 16. <a href="https://www.dcs.gla.ac.uk/~wpc/grcs/Davies05.pdf" target="_blank">https://www.dcs.gla.ac.uk/~wpc/grcs/Davies05.pdf</a> <a href="#fnref:71" class="footnote-back-ref">↩</a></li>
<li id="fn:72">Heart, F.; McKenzie, A.; McQuillian, J.; Walden, D. (January 4, 1978). Arpanet Completion Report (PDF) (Technical report). Burlington, MA: Bolt, Beranek and Newman. pp. III-40-1 <a href="https://web.archive.org/web/20230527095942/https://walden-family.com/bbn/arpanet-completion-report.pdf" target="_blank">https://web.archive.org/web/20230527095942/https://walden-family.com/bbn/arpanet-completion-report.pdf</a> <a href="#fnref:72" class="footnote-back-ref">↩</a></li>
<li id="fn:73">"SRI Project 5890-1; Networking (Reports on Meetings). [1967]". web.stanford.edu. Archived from the original on 2011-08-10. Retrieved 2020-02-15. <a href="https://web.archive.org/web/20110810063347/http://sloan.stanford.edu/mousesite/EngelbartPapers/B1_F20_CompuMtg.html" target="_blank">https://web.archive.org/web/20110810063347/http://sloan.stanford.edu/mousesite/EngelbartPapers/B1_F20_CompuMtg.html</a> <a href="#fnref:73" class="footnote-back-ref">↩</a></li>
<li id="fn:74">Hafner & Lyon 1996 - Hafner, Katie; Lyon, Matthew (1996). Where wizards stay up late: the origins of the Internet. Internet Archive. Simon & Schuster. pp. 76–78. ISBN 978-0-684-81201-4. Roger Scantlebury ... from Donald Davies' team ... presented a detailed design study for a packet switched network. It was the first Roberts had heard of it. ... Roberts also learned from Scantlebury, for the first time, of the work that had been done by Paul Baran at RAND a few years earlier. <a href="http://archive.org/details/wherewizardsstay00haf_vgj" target="_blank">http://archive.org/details/wherewizardsstay00haf_vgj</a> <a href="#fnref:74" class="footnote-back-ref">↩</a></li>
<li id="fn:75">"Shapiro: Computer Network Meeting of October 9–10, 1967". stanford.edu. Archived from the original on 27 June 2015. <a href="https://web.archive.org/web/20150627133802/https://web.stanford.edu/dept/SUL/library/extra4/sloan/mousesite/Archive/Post68/ARPANETMeeting1167.html" target="_blank">https://web.archive.org/web/20150627133802/https://web.stanford.edu/dept/SUL/library/extra4/sloan/mousesite/Archive/Post68/ARPANETMeeting1167.html</a> <a href="#fnref:75" class="footnote-back-ref">↩</a></li>
<li id="fn:76">Abbate, Janet (2000). Inventing the Internet. Cambridge, MA: MIT Press. pp. 39, 57–58. ISBN 978-0-2625-1115-5. Baran proposed a "distributed adaptive message-block network" [in the early 1960s] ... Roberts recruited Baran to advise the ARPANET planning group on distributed communications and packet switching. ... Roberts awarded a contract to Leonard Kleinrock of UCLA to create theoretical models of the network and to analyze its actual performance. <a href="978-0-2625-1115-5" target="_blank">978-0-2625-1115-5</a> <a href="#fnref:76" class="footnote-back-ref">↩</a></li>
<li id="fn:77">Summary of ARPA ad hoc meeting, November 3, 1967, We propose that a working group of approximately four people devote some concentrated effort in the near future in defining the IMP precisely. This group would interact with the larger group from the earlier meetings from time to time. Tentatively we think that the core of this investigatory group would be Bhushan (MIT), Kleinrock (UCLA), Shapiro (SRI) and Westervelt (University of Michigan), along with a kibitzer's group, consisting of such people as Baran (Rand), Boehm (Rand), Culler (UCSB) and Roberts (ARPA). <a href="https://archive.org/details/SummaryOfArpaAdHocMeeting/page/n1/mode/2up" target="_blank">https://archive.org/details/SummaryOfArpaAdHocMeeting/page/n1/mode/2up</a> <a href="#fnref:77" class="footnote-back-ref">↩</a></li>
<li id="fn:78">Judy O'Neill (1990), Oral history interview with Paul Baran, Charles Babbage Institute, hdl:11299/107101, BARAN: On Tuesday, 31 October 1967 I see a notation 9:30 AM to 2:00 PM for ARPA's (Elmer) Shapiro, (Barry) Boehm, (Len) Kleinrock, ARPA Network. On Monday, 13 November 1967 I see the following: Larry Roberts to abt (about?) lunch (time?). Art Bushkin = 1:00 PM. Here. Larry Roberts IMP Committee. On Thursday, 16 November 1967 I see 7 PM Kleinrock, UCLA - IMP Meeting. <a href="https://conservancy.umn.edu/handle/11299/107101" target="_blank">https://conservancy.umn.edu/handle/11299/107101</a> <a href="#fnref:78" class="footnote-back-ref">↩</a></li>
<li id="fn:79">Meeting of the ARPA Computer Network Working Group at UCLA, November 16, 1967 <a href="https://archive.org/details/MeetingOfTheArpaComputerNetworkWorkingGroupAtUcla" target="_blank">https://archive.org/details/MeetingOfTheArpaComputerNetworkWorkingGroupAtUcla</a> <a href="#fnref:79" class="footnote-back-ref">↩</a></li>
<li id="fn:80">Abbate, Janet (2000). Inventing the Internet. Cambridge, MA: MIT Press. pp. 39, 57–58. ISBN 978-0-2625-1115-5. Baran proposed a "distributed adaptive message-block network" [in the early 1960s] ... Roberts recruited Baran to advise the ARPANET planning group on distributed communications and packet switching. ... Roberts awarded a contract to Leonard Kleinrock of UCLA to create theoretical models of the network and to analyze its actual performance. <a href="978-0-2625-1115-5" target="_blank">978-0-2625-1115-5</a> <a href="#fnref:80" class="footnote-back-ref">↩</a></li>
<li id="fn:81">Hafner & Lyon 1996, pp. 116, 149 - Hafner, Katie; Lyon, Matthew (1996). Where wizards stay up late: the origins of the Internet. Internet Archive. Simon & Schuster. pp. 76–78. ISBN 978-0-684-81201-4. Roger Scantlebury ... from Donald Davies' team ... presented a detailed design study for a packet switched network. It was the first Roberts had heard of it. ... Roberts also learned from Scantlebury, for the first time, of the work that had been done by Paul Baran at RAND a few years earlier. <a href="http://archive.org/details/wherewizardsstay00haf_vgj" target="_blank">http://archive.org/details/wherewizardsstay00haf_vgj</a> <a href="#fnref:81" class="footnote-back-ref">↩</a></li>
<li id="fn:82">Pelkey, James L. "6.1 The Communications Subnet: BBN 1969". Entrepreneurial Capitalism and Innovation: A History of Computer Communications 1968–1988. Kahn, the principal architect <a href="https://historyofcomputercommunications.info/section/6.1/the-communications-subnet-bbn-1969/" target="_blank">https://historyofcomputercommunications.info/section/6.1/the-communications-subnet-bbn-1969/</a> <a href="#fnref:82" class="footnote-back-ref">↩</a></li>
<li id="fn:83">Hafner, Katie (2018-12-30). "Lawrence Roberts, Who Helped Design Internet's Precursor, Dies at 81". The New York Times. ISSN 0362-4331. Retrieved 2020-02-20. He decided to use packet switching as the underlying technology of the Arpanet; it remains central to the function of the internet. And it was Dr. Roberts's decision to build a network that distributed control of the network across multiple computers. Distributed networking remains another foundation of today's internet. <a href="https://www.nytimes.com/2018/12/30/obituaries/lawrence-g-roberts-dies-at-81.html" target="_blank">https://www.nytimes.com/2018/12/30/obituaries/lawrence-g-roberts-dies-at-81.html</a> <a href="#fnref:83" class="footnote-back-ref">↩</a></li>
<li id="fn:84">Roberts, Lawrence G. (November 1978). "The Evolution of Packet Switching" (PDF). IEEE Invited Paper. Archived from the original (PDF) on 31 December 2018. Retrieved September 10, 2017. Significant aspects of the network's internal operation, such as routing, flow control, software design, and network control were developed by a BBN team consisting of Frank Heart, Robert Kahn, Severo Omstein, William Crowther, and David Walden <a href="https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf" target="_blank">https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf</a> <a href="#fnref:84" class="footnote-back-ref">↩</a></li>
<li id="fn:85">F.E. Froehlich, A. Kent (1990). The Froehlich/Kent Encyclopedia of Telecommunications: Volume 1 - Access Charges in the U.S.A. to Basics of Digital Communications. CRC Press. p. 344. ISBN 0824729005. Although there was considerable technical interchange between the NPL group and those who designed and implemented the ARPANET, the NPL Data Network effort appears to have had little fundamental impact on the design of ARPANET. Such major aspects of the NPL Data Network design as the standard network interface, the routing algorithm, and the software structure of the switching node were largely ignored by the ARPANET designers. There is no doubt, however, that in many less fundamental ways the NPL Data Network had and effect on the design and evolution of the ARPANET. <a href="0824729005" target="_blank">0824729005</a> <a href="#fnref:85" class="footnote-back-ref">↩</a></li>
<li id="fn:86">Hafner & Lyon 1996, pp. 116, 149 - Hafner, Katie; Lyon, Matthew (1996). Where wizards stay up late: the origins of the Internet. Internet Archive. Simon & Schuster. pp. 76–78. ISBN 978-0-684-81201-4. Roger Scantlebury ... from Donald Davies' team ... presented a detailed design study for a packet switched network. It was the first Roberts had heard of it. ... Roberts also learned from Scantlebury, for the first time, of the work that had been done by Paul Baran at RAND a few years earlier. <a href="http://archive.org/details/wherewizardsstay00haf_vgj" target="_blank">http://archive.org/details/wherewizardsstay00haf_vgj</a> <a href="#fnref:86" class="footnote-back-ref">↩</a></li>
<li id="fn:87">RFC 334 <a href="/wiki/RFC_(identifier)" target="_blank">/wiki/RFC_(identifier)</a> <a href="#fnref:87" class="footnote-back-ref">↩</a></li>
<li id="fn:88">RFC 53 <a href="/wiki/RFC_(identifier)" target="_blank">/wiki/RFC_(identifier)</a> <a href="#fnref:88" class="footnote-back-ref">↩</a></li>
<li id="fn:89">Heart, F.; McKenzie, A.; McQuillian, J.; Walden, D. (January 4, 1978). Arpanet Completion Report (PDF) (Technical report). Burlington, MA: Bolt, Beranek and Newman. p. III-63. <a href="https://web.archive.org/web/20230527095942/https://walden-family.com/bbn/arpanet-completion-report.pdf" target="_blank">https://web.archive.org/web/20230527095942/https://walden-family.com/bbn/arpanet-completion-report.pdf</a> <a href="#fnref:89" class="footnote-back-ref">↩</a></li>
<li id="fn:90">Clarke, Peter (1982). Packet and circuit-switched data networks (PDF) (PhD thesis). Department of Electrical Engineering, Imperial College of Science and Technology, University of London. "Many of the theoretical studies of the performance and design of the ARPA Network were developments of earlier work by Kleinrock ... Although these works concerned message switching networks, they were the basis for a lot of the ARPA network investigations ... The intention of the work of Kleinrock [in 1961] was to analyse the performance of store and forward networks ... Kleinrock [in 1970] extended the theoretical approaches of [his 1961 work] to the early ARPA network." <a href="https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf" target="_blank">https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf</a> <a href="#fnref:90" class="footnote-back-ref">↩</a></li>
<li id="fn:91">Abbate, Janet (1999). Inventing the Internet. Internet Archive. MIT Press. p. 230. ISBN 978-0-262-01172-3. On Kleinrock's influence, see Frank, Kahn, and Kleinrock 1972, p. 265; Tanenbaum 1989, p. 631. <a href="978-0-262-01172-3" target="_blank">978-0-262-01172-3</a> <a href="#fnref:91" class="footnote-back-ref">↩</a></li>
<li id="fn:92">Davies, Donald Watts (1979). Computer networks and their protocols. Internet Archive. Wiley. pp. See page refs highlighted at url. ISBN 978-0-471-99750-4. <a href="978-0-471-99750-4" target="_blank">978-0-471-99750-4</a> <a href="#fnref:92" class="footnote-back-ref">↩</a></li>
<li id="fn:93">Kleinrock, L. (1978). "Principles and lessons in packet communications". Proceedings of the IEEE. 66 (11): 1320–1329. doi:10.1109/PROC.1978.11143. ISSN 0018-9219. <a href="https://ieeexplore.ieee.org/document/1455412" target="_blank">https://ieeexplore.ieee.org/document/1455412</a> <a href="#fnref:93" class="footnote-back-ref">↩</a></li>
<li id="fn:94">Pelkey, James. "8.3 CYCLADES Network and Louis Pouzin 1971–1972". Entrepreneurial Capitalism and Innovation: A History of Computer Communications 1968–1988. <a href="https://historyofcomputercommunications.info/section/8.3/CYCLADES-Network-and-Louis-Pouzin-1971-1972/" target="_blank">https://historyofcomputercommunications.info/section/8.3/CYCLADES-Network-and-Louis-Pouzin-1971-1972/</a> <a href="#fnref:94" class="footnote-back-ref">↩</a></li>
<li id="fn:95">Hafner & Lyon 1996, p. 222 - Hafner, Katie; Lyon, Matthew (1996). Where wizards stay up late: the origins of the Internet. Internet Archive. Simon & Schuster. pp. 76–78. ISBN 978-0-684-81201-4. Roger Scantlebury ... from Donald Davies' team ... presented a detailed design study for a packet switched network. It was the first Roberts had heard of it. ... Roberts also learned from Scantlebury, for the first time, of the work that had been done by Paul Baran at RAND a few years earlier. <a href="http://archive.org/details/wherewizardsstay00haf_vgj" target="_blank">http://archive.org/details/wherewizardsstay00haf_vgj</a> <a href="#fnref:95" class="footnote-back-ref">↩</a></li>
<li id="fn:96">Pelkey, James. "8.4 Transmission Control Protocol (TCP) 1973-1976". Entrepreneurial Capitalism and Innovation: A History of Computer Communications 1968–1988. Arpanet had its deficiencies, however, for it was neither a true datagram network nor did it provide end-to-end error correction. <a href="https://historyofcomputercommunications.info/section/8.4/transmission-control-protocol-(tcp)-1973-1976/" target="_blank">https://historyofcomputercommunications.info/section/8.4/transmission-control-protocol-(tcp)-1973-1976/</a> <a href="#fnref:96" class="footnote-back-ref">↩</a></li>
<li id="fn:97">Pouzin, Louis (May 1975). "An integrated approach to network protocols". Proceedings of the May 19-22, 1975, national computer conference and exposition on - AFIPS '75. Association for Computing Machinery. pp. 701–707. doi:10.1145/1499949.1500100. ISBN 978-1-4503-7919-9. S2CID 1689917. <a href="978-1-4503-7919-9" target="_blank">978-1-4503-7919-9</a> <a href="#fnref:97" class="footnote-back-ref">↩</a></li>
<li id="fn:98">Roberts, Dr. Lawrence G. (November 1978). "The Evolution of Packet Switching" (PDF). IEEE Invited Paper. Archived from the original (PDF) on December 31, 2018. Retrieved September 10, 2017. <a href="https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf" target="_blank">https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf</a> <a href="#fnref:98" class="footnote-back-ref">↩</a></li>
<li id="fn:99">Roberts, L. (1988), "The arpanet and computer networks", A history of personal workstations, New York, NY, USA: Association for Computing Machinery, pp. 141–172, doi:10.1145/61975.66916, ISBN 978-0-201-11259-7, retrieved 2023-11-30 <a href="978-0-201-11259-7" target="_blank">978-0-201-11259-7</a> <a href="#fnref:99" class="footnote-back-ref">↩</a></li>
<li id="fn:100">Abbate, Janet (2000). Inventing the Internet. MIT Press. pp. 124–127. ISBN 978-0-262-51115-5. In fact, CYCLADES, unlike ARPANET, had been explicitly designed to facilitate internetworking; it could, for instance, handle varying formats and varying levels of service <a href="978-0-262-51115-5" target="_blank">978-0-262-51115-5</a> <a href="#fnref:100" class="footnote-back-ref">↩</a></li>
<li id="fn:101">Kim, Byung-Keun (2005). Internationalising the Internet the Co-evolution of Influence and Technology. Edward Elgar. pp. 51–55. ISBN 1845426754. In addition to the NPL Network and the ARPANET, CYCLADES, an academic and research experimental network, also played an important role in the development of computer networking technologies <a href="1845426754" target="_blank">1845426754</a> <a href="#fnref:101" class="footnote-back-ref">↩</a></li>
<li id="fn:102">"The internet's fifth man". The Economist. 2013-11-30. ISSN 0013-0613. Retrieved 2020-04-22. In the early 1970s Mr Pouzin created an innovative data network that linked locations in France, Italy and Britain. Its simplicity and efficiency pointed the way to a network that could connect not just dozens of machines, but millions of them. It captured the imagination of Dr Cerf and Dr Kahn, who included aspects of its design in the protocols that now power the internet. <a href="https://www.economist.com/news/technology-quarterly/21590765-louis-pouzin-helped-create-internet-now-he-campaigning-ensure-its" target="_blank">https://www.economist.com/news/technology-quarterly/21590765-louis-pouzin-helped-create-internet-now-he-campaigning-ensure-its</a> <a href="#fnref:102" class="footnote-back-ref">↩</a></li>
<li id="fn:103">Bennett, Richard (September 2009). "Designed for Change: End-to-End Arguments, Internet Innovation, and the Net Neutrality Debate" (PDF). Information Technology and Innovation Foundation. pp. 7, 9, 11. Retrieved 11 September 2017. Two significant packet networks preceded the TCP/IP Internet: ARPANET and CYCLADES. The designers of the Internet borrowed heavily from these systems, especially CYCLADES ... The first end-to-end research network was CYCLADES, designed by Louis Pouzin at IRIA in France with the support of BBN's Dave Walden and Alex McKenzie and deployed beginning in 1972. <a href="https://www.itif.org/files/2009-designed-for-change.pdf" target="_blank">https://www.itif.org/files/2009-designed-for-change.pdf</a> <a href="#fnref:103" class="footnote-back-ref">↩</a></li>
<li id="fn:104">Green, Lelia (2010). The internet: an introduction to new media. Berg new media series. Berg. p. 31. ISBN 978-1-84788-299-8. OCLC 504280762. The original ARPANET design had made data integrity part of the IMP's store-and-forward role, but Cyclades end-to-end protocol greatly simplified the packet switching operations of the network. ... The idea was to adopt several principles from Cyclades and invert the ARPANET model to minimise international differences. <a href="978-1-84788-299-8" target="_blank">978-1-84788-299-8</a> <a href="#fnref:104" class="footnote-back-ref">↩</a></li>
<li id="fn:105">Moschovitis 1999, p. 78-9 - Moschovitis, Christos J. P. (1999). History of the Internet: A Chronology, 1843 to the Present. ABC-CLIO. ISBN 978-1-57607-118-2. <a href="https://archive.org/details/historyofinterne0000unse" target="_blank">https://archive.org/details/historyofinterne0000unse</a> <a href="#fnref:105" class="footnote-back-ref">↩</a></li>
<li id="fn:106">Cerf, V.; Kahn, R. (1974). "A Protocol for Packet Network Intercommunication" (PDF). IEEE Transactions on Communications. 22 (5): 637–648. doi:10.1109/TCOM.1974.1092259. ISSN 1558-0857. Archived (PDF) from the original on 2022-10-10. The authors wish to thank a number of colleagues for helpful comments during early discussions of international network protocols, especially R. Metcalfe, R. Scantlebury, D. Walden, and H. Zimmerman; D. Davies and L. Pouzin who constructively commented on the fragmentation and accounting issues; and S. Crocker who commented on the creation and destruction of associations. <a href="https://www.cs.princeton.edu/courses/archive/fall06/cos561/papers/cerf74.pdf" target="_blank">https://www.cs.princeton.edu/courses/archive/fall06/cos561/papers/cerf74.pdf</a> <a href="#fnref:106" class="footnote-back-ref">↩</a></li>
<li id="fn:107">Cerf, Vinton; Dalal, Yogen; Sunshine, Carl (December 1974). Specification of Internet Transmission Control Protocol. IETF. doi:10.17487/RFC0675. RFC 675. <a href="https://datatracker.ietf.org/doc/html/rfc675" target="_blank">https://datatracker.ietf.org/doc/html/rfc675</a> <a href="#fnref:107" class="footnote-back-ref">↩</a></li>
<li id="fn:108">Postel, Jon (August 29, 1979). "Comparison of X.25 and TCP Version 4 as Cable-bus Network Protocols" (PDF). <a href="https://www.rfc-editor.org/ien/ien130.pdf" target="_blank">https://www.rfc-editor.org/ien/ien130.pdf</a> <a href="#fnref:108" class="footnote-back-ref">↩</a></li>
<li id="fn:109">Camrass, R.; Gallager, R. (1978). "Encoding message lengths for data transmission (Corresp.)". IEEE Transactions on Information Theory. 24 (4): 495–496. doi:10.1109/TIT.1978.1055910. ISSN 0018-9448. <a href="https://ieeexplore.ieee.org/document/1055910" target="_blank">https://ieeexplore.ieee.org/document/1055910</a> <a href="#fnref:109" class="footnote-back-ref">↩</a></li>
<li id="fn:110">"Reflections on an Internet pioneer: Roger Camrass". stories.clare.cam.ac.uk. Retrieved 2024-07-01. <a href="http://stories.clare.cam.ac.uk/reflections-of-an-internet-pioneer/" target="_blank">http://stories.clare.cam.ac.uk/reflections-of-an-internet-pioneer/</a> <a href="#fnref:110" class="footnote-back-ref">↩</a></li>
<li id="fn:111">Cerf, Vinton G.; Postel, Jon (August 18, 1977). "Specification of Internetwork Transmission Program: TCP Version 3" (PDF). p. iii, 75-87. <a href="https://www.rfc-editor.org/ien/ien21.pdf" target="_blank">https://www.rfc-editor.org/ien/ien21.pdf</a> <a href="#fnref:111" class="footnote-back-ref">↩</a></li>
<li id="fn:112">Postel, Jon (September 1978). "Specification of Internetwork Transmission Control Protocol: TCP Version 4" (PDF). pp. iii, 85–97. <a href="https://www.rfc-editor.org/ien/ien55.pdf" target="_blank">https://www.rfc-editor.org/ien/ien55.pdf</a> <a href="#fnref:112" class="footnote-back-ref">↩</a></li>
<li id="fn:113">Cerf, Vinton G. (1 April 1980). "Final Report of the Stanford University TCP Project". <a href="https://www.rfc-editor.org/ien/ien151.txt" target="_blank">https://www.rfc-editor.org/ien/ien151.txt</a> <a href="#fnref:113" class="footnote-back-ref">↩</a></li>
<li id="fn:114">Moschovitis 1999, p. 78-9 - Moschovitis, Christos J. P. (1999). History of the Internet: A Chronology, 1843 to the Present. ABC-CLIO. ISBN 978-1-57607-118-2. <a href="https://archive.org/details/historyofinterne0000unse" target="_blank">https://archive.org/details/historyofinterne0000unse</a> <a href="#fnref:114" class="footnote-back-ref">↩</a></li>
<li id="fn:115">"ISI Names Dr. Paul Mockapetris Visiting Scholar" Archived 2012-08-26 at the Wayback Machine, Information Sciences Institute, University of Southern California, 27 March 2003 <a href="https://www3.isi.edu/news/story/54" target="_blank">https://www3.isi.edu/news/story/54</a> <a href="#fnref:115" class="footnote-back-ref">↩</a></li>
<li id="fn:116">"Congestion avoidance and control", Van Jacobson, ACM SIGCOMM Computer Communication Review - Special twenty-fifth anniversary issue, Highlights from 25 years of the Computer Communication Review, Volume 25 Issue 1, Jan. 1995, pp.157-187 <a href="http://portal.acm.org/citation.cfm?doid=205447.205462" target="_blank">http://portal.acm.org/citation.cfm?doid=205447.205462</a> <a href="#fnref:116" class="footnote-back-ref">↩</a></li>
<li id="fn:117">Andrew L. Russell (30 July 2013). "OSI: The Internet That Wasn't". IEEE Spectrum. Vol. 50, no. 8. <a href="https://spectrum.ieee.org/osi-the-internet-that-wasnt" target="_blank">https://spectrum.ieee.org/osi-the-internet-that-wasnt</a> <a href="#fnref:117" class="footnote-back-ref">↩</a></li>
<li id="fn:118">Russell, Andrew L. "Rough Consensus and Running Code' and the Internet-OSI Standards War" (PDF). IEEE Annals of the History of Computing. Archived (PDF) from the original on 2019-11-17. <a href="https://www2.cs.duke.edu/courses/common/compsci092/papers/govern/consensus.pdf" target="_blank">https://www2.cs.duke.edu/courses/common/compsci092/papers/govern/consensus.pdf</a> <a href="#fnref:118" class="footnote-back-ref">↩</a></li>
<li id="fn:119">Davies, Howard; Bressan, Beatrice (2010). "The Protocol Wars". A History of International Research Networking: The People who Made it Happen. John Wiley & Sons. pp. 106–110. ISBN 978-3-527-32710-2. <a href="978-3-527-32710-2" target="_blank">978-3-527-32710-2</a> <a href="#fnref:119" class="footnote-back-ref">↩</a></li>
<li id="fn:120">Postel, J. (7 February 1979). "Internet Meeting Notes -- 25 & 26 January 1979" (PDF). p. 5. Retrieved 9 February 2022. Vint noted that UCLA's internet work is primarily theoretical research on throughput and delay analysis. This work is headed by L. Kleinrock. <a href="https://www.rfc-editor.org/ien/ien76.pdf" target="_blank">https://www.rfc-editor.org/ien/ien76.pdf</a> <a href="#fnref:120" class="footnote-back-ref">↩</a></li>
<li id="fn:121">Heart, F.; McKenzie, A.; McQuillian, J.; Walden, D. (January 4, 1978). Arpanet Completion Report (PDF) (Technical report). Burlington, MA: Bolt, Beranek and Newman. Archived from the original (PDF) on 2023-05-27. <a href="https://web.archive.org/web/20230527095942/https://walden-family.com/bbn/arpanet-completion-report.pdf" target="_blank">https://web.archive.org/web/20230527095942/https://walden-family.com/bbn/arpanet-completion-report.pdf</a> <a href="#fnref:121" class="footnote-back-ref">↩</a></li>
<li id="fn:122">Davies, Donald Watts (1979). Computer networks and their protocols. Internet Archive. Wiley. pp. See page refs highlighted at url. ISBN 978-0-471-99750-4. In mathematical modelling use is made of the theories of queueing processes and of flows in networks, describing the performance of the network in a set of equations. ... The analytic method has been used with success by Kleinrock and others, but only if important simplifying assumptions are made. ... It is heartening in Kleinrock's work to see the good correspondence achieved between the results of analytic methods and those of simulation. <a href="978-0-471-99750-4" target="_blank">978-0-471-99750-4</a> <a href="#fnref:122" class="footnote-back-ref">↩</a></li>
<li id="fn:123">Davies, Donald Watts (1979). Computer networks and their protocols. Internet Archive. Wiley. pp. 110–111. ISBN 978-0-471-99750-4. Hierarchical addressing systems for network routing have been proposed by Fultz and, in greater detail, by McQuillan. A recent very full analysis may be found in Kleinrock and Kamoun. <a href="978-0-471-99750-4" target="_blank">978-0-471-99750-4</a> <a href="#fnref:123" class="footnote-back-ref">↩</a></li>
<li id="fn:124">Feldmann, Anja; Cittadini, Luca; Mühlbauer, Wolfgang; Bush, Randy; Maennel, Olaf (2009). "HAIR: Hierarchical architecture for internet routing" (PDF). Proceedings of the 2009 workshop on Re-architecting the internet. ReArch '09. New York, NY, USA: Association for Computing Machinery. pp. 43–48. doi:10.1145/1658978.1658990. ISBN 978-1-60558-749-3. S2CID 2930578. The hierarchical approach is further motivated by theoretical results (e.g., [16]) which show that, by optimally placing separators, i.e., elements that connect levels in the hierarchy, tremendous gain can be achieved in terms of both routing table size and update message churn. ... [16] KLEINROCK, L., AND KAMOUN, F. Hierarchical routing for large networks: Performance evaluation and optimization. Computer Networks (1977). <a href="978-1-60558-749-3" target="_blank">978-1-60558-749-3</a> <a href="#fnref:124" class="footnote-back-ref">↩</a></li>
<li id="fn:125">"Leonard Kleinrock". Internet Hall of Fame. Retrieved 2023-03-13. <a href="https://www.internethalloffame.org/inductee/leonard-kleinrock/" target="_blank">https://www.internethalloffame.org/inductee/leonard-kleinrock/</a> <a href="#fnref:125" class="footnote-back-ref">↩</a></li>
<li id="fn:126">"Kleinrock (Leonard) papers". oac.cdlib.org. Retrieved 2023-04-04. <a href="https://oac.cdlib.org/findaid/ark:/13030/c8kd240b/entire_text/" target="_blank">https://oac.cdlib.org/findaid/ark:/13030/c8kd240b/entire_text/</a> <a href="#fnref:126" class="footnote-back-ref">↩</a></li>
<li id="fn:127">Clarke, Peter (1982). Packet and circuit-switched data networks (PDF) (PhD thesis). Department of Electrical Engineering, Imperial College of Science and Technology, University of London. "Many of the theoretical studies of the performance and design of the ARPA Network were developments of earlier work by Kleinrock ... Although these works concerned message switching networks, they were the basis for a lot of the ARPA network investigations ... The intention of the work of Kleinrock [in 1961] was to analyse the performance of store and forward networks ... Kleinrock [in 1970] extended the theoretical approaches of [his 1961 work] to the early ARPA network." <a href="https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf" target="_blank">https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf</a> <a href="#fnref:127" class="footnote-back-ref">↩</a></li>
<li id="fn:128">Abbate, Janet (1999). Inventing the Internet. Internet Archive. MIT Press. p. 81. ISBN 978-0-262-01172-3. <a href="978-0-262-01172-3" target="_blank">978-0-262-01172-3</a> <a href="#fnref:128" class="footnote-back-ref">↩</a></li>
<li id="fn:129">Hayward, G.; Gottlieb, A.; Jain, S.; Mahoney, D. (October 1987). "CMOS VLSI Applications in Broadband Circuit Switching". IEEE Journal on Selected Areas in Communications. 5 (8): 1231–1241. doi:10.1109/JSAC.1987.1146652. ISSN 1558-0008. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:129" class="footnote-back-ref">↩</a></li>
<li id="fn:130">Hui, J.; Arthurs, E. (October 1987). "A Broadband Packet Switch for Integrated Transport". IEEE Journal on Selected Areas in Communications. 5 (8): 1264–1273. doi:10.1109/JSAC.1987.1146650. ISSN 1558-0008. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:130" class="footnote-back-ref">↩</a></li>
<li id="fn:131">Gibson, Jerry D. (2018). The Communications Handbook. CRC Press. ISBN 9781420041163. <a href="9781420041163" target="_blank">9781420041163</a> <a href="#fnref:131" class="footnote-back-ref">↩</a></li>
<li id="fn:132">Roberts, Lawrence (1967). "Multiple computer networks and intercomputer communication" (PDF). Multiple Computer Networks and Intercomputer Communications. pp. 3.1 – 3.6. doi:10.1145/800001.811680. S2CID 17409102. Thus the set of IMP's, plus the telephone lines and data sets would constitute a message switching network <a href="https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/arpanet.pdf" target="_blank">https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/arpanet.pdf</a> <a href="#fnref:132" class="footnote-back-ref">↩</a></li>
<li id="fn:133">Naughton, John (2015). A Brief History of the Future: The origins of the Internet. Hachette. ISBN 978-1474602778. they lacked one vital ingredient. Since none of them had heard of Paul Baran they had no serious idea of how to make the system work. And it took an English outfit to tell them. ... Larry Roberts paper was the first public presentation of the ARPANET concept as conceived with the aid of Wesley Clark ... Looking at it now, Roberts paper seems extraordinarily, well, vague. <a href="978-1474602778" target="_blank">978-1474602778</a> <a href="#fnref:133" class="footnote-back-ref">↩</a></li>
<li id="fn:134">Tanenbaum, Andrew S.; Wetherall, David (2011). Computer networks (PDF) (5th ed.). Boston Amsterdam: Prentice Hall. p. 57. ISBN 978-0-13-212695-3. Roberts bought the idea and presented a some what vague paper about it at the ACM SIGOPS Symposium on Operating System Principles held in Gatlinburg, Tennessee in late 1967 <a href="978-0-13-212695-3" target="_blank">978-0-13-212695-3</a> <a href="#fnref:134" class="footnote-back-ref">↩</a></li>
<li id="fn:135">Kirstein, Peter T. (2009). "The early history of packet switching in the UK". IEEE Communications Magazine. 47 (2): 18–26. doi:10.1109/MCOM.2009.4785372. S2CID 34735326. It is more difficult to establish at this time, however, whether Larry intended to switch the fragments as independent packets in the ARPAnet before he heard of the NPL work; certainly he now claims that this was always his intention. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:135" class="footnote-back-ref">↩</a></li>
<li id="fn:136">technicshistory (2019-06-02). "ARPANET, Part 2: The Packet". Creatures of Thought. Retrieved 2024-06-21. The above description of how packet-switching came to be is the most widely-accepted one. However, there is an alternative version. Roberts claimed in later years that by the time of the Gatlinburg symposium, he already had the basic concepts of packet-switching well in mind, and that they originated with his old colleague Len Kleinrock, who had written about them as early as 1962, as part of his Ph.D. research on communication nets. It requires a great deal of squinting to extract anything resembling packet-switching from Kleinrock's work, however, and no other contemporary textual evidence that I have come across backs the Kleinrock/Roberts account. <a href="https://technicshistory.com/2019/06/02/arpanet-part-2-the-packet/" target="_blank">https://technicshistory.com/2019/06/02/arpanet-part-2-the-packet/</a> <a href="#fnref:136" class="footnote-back-ref">↩</a></li>
<li id="fn:137">Barry M. Leiner, Vinton G. Cerf, David D. Clark, Robert E. Kahn, Leonard Kleinrock, Daniel C. Lynch, Jon Postel, Larry G. Roberts, Stephen Wolff (1997), Brief History of the Internet, Internet Society{{citation}}: CS1 maint: multiple names: authors list (link) <a href="https://www.internetsociety.org/resources/doc/2017/brief-history-internet/" target="_blank">https://www.internetsociety.org/resources/doc/2017/brief-history-internet/</a> <a href="#fnref:137" class="footnote-back-ref">↩</a></li>
<li id="fn:138">Katie Hafner (November 8, 2001), "A Paternity Dispute Divides Net Pioneers", New York Times, The Internet is really the work of a thousand people," Mr. Baran said. "And of all the stories about what different people have done, all the pieces fit together. It's just this one little case that seems to be an aberration. <a href="https://www.nytimes.com/2001/11/08/technology/a-paternity-dispute-divides-net-pioneers.html?pagewanted=all" target="_blank">https://www.nytimes.com/2001/11/08/technology/a-paternity-dispute-divides-net-pioneers.html?pagewanted=all</a> <a href="#fnref:138" class="footnote-back-ref">↩</a></li>
<li id="fn:139">UCLA Computer Science Dept. "Leonard Kleinrock, Professor (archived)". UCLA Computer Science Dept. Archived from the original on Feb 27, 2004. Retrieved 28 December 2023. <a href="https://web.archive.org/web/20040227150208/http://www.lk.cs.ucla.edu:80/index.html" target="_blank">https://web.archive.org/web/20040227150208/http://www.lk.cs.ucla.edu:80/index.html</a> <a href="#fnref:139" class="footnote-back-ref">↩</a></li>
<li id="fn:140">Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon & Schuster. pp. 244–6. ISBN 9781476708690. <a href="9781476708690" target="_blank">9781476708690</a> <a href="#fnref:140" class="footnote-back-ref">↩</a></li>
<li id="fn:141">Donald W. Davies (2001), "An Historical Study of the Beginnings of Packet Switching", The Computer Journal, I can find no evidence that he understood the principles of packet switching. <a href="https://academic.oup.com/comjnl/article-abstract/44/3/152/415514" target="_blank">https://academic.oup.com/comjnl/article-abstract/44/3/152/415514</a> <a href="#fnref:141" class="footnote-back-ref">↩</a></li>
<li id="fn:142">Harris, Trevor, University of Wales (2009). Pasadeos, Yorgo (ed.). "Who is the Father of the Internet? The Case for Donald Davies". Variety in Mass Communication Research. ATINER: 123–134. ISBN 978-960-6672-46-0. Archived from the original on May 2, 2022. Leonard Kleinrock and Lawrence (Larry) Roberts, neither of whom were directly involved in the invention of packet switching ... Dr Willis H. Ware, Senior Computer Scientist and Research at the RAND Corporation, notes that Davies (and others) were troubled by what they regarded as in appropriate claims on the invention of packet switching{{cite journal}}: CS1 maint: multiple names: authors list (link) <a href="978-960-6672-46-0" target="_blank">978-960-6672-46-0</a> <a href="#fnref:142" class="footnote-back-ref">↩</a></li>
<li id="fn:143">Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon & Schuster. pp. 244–6. ISBN 9781476708690. <a href="9781476708690" target="_blank">9781476708690</a> <a href="#fnref:143" class="footnote-back-ref">↩</a></li>
<li id="fn:144">Roberts, Lawrence G. (November 1978). "The Evolution of Packet Switching" (PDF). IEEE Invited Paper. Archived from the original (PDF) on 31 December 2018. Retrieved September 10, 2017. Significant aspects of the network's internal operation, such as routing, flow control, software design, and network control were developed by a BBN team consisting of Frank Heart, Robert Kahn, Severo Omstein, William Crowther, and David Walden <a href="https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf" target="_blank">https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf</a> <a href="#fnref:144" class="footnote-back-ref">↩</a></li>
<li id="fn:145">F.E. Froehlich, A. Kent (1990). The Froehlich/Kent Encyclopedia of Telecommunications: Volume 1 - Access Charges in the U.S.A. to Basics of Digital Communications. CRC Press. p. 344. ISBN 0824729005. Although there was considerable technical interchange between the NPL group and those who designed and implemented the ARPANET, the NPL Data Network effort appears to have had little fundamental impact on the design of ARPANET. Such major aspects of the NPL Data Network design as the standard network interface, the routing algorithm, and the software structure of the switching node were largely ignored by the ARPANET designers. There is no doubt, however, that in many less fundamental ways the NPL Data Network had and effect on the design and evolution of the ARPANET. <a href="0824729005" target="_blank">0824729005</a> <a href="#fnref:145" class="footnote-back-ref">↩</a></li>
<li id="fn:146">Judy O'Neill (12 March 1990), Oral history interview with William Crowther, hdl:11299/107235, ...there were all sorts of crazy ideas about, and most of them didn't make any sense. There was this 'hot potato' routing which somebody was advocating, which was just crazy. <a href="https://conservancy.umn.edu/handle/11299/107235" target="_blank">https://conservancy.umn.edu/handle/11299/107235</a> <a href="#fnref:146" class="footnote-back-ref">↩</a></li>
<li id="fn:147">Alex McKenzie (2009), Comments on Dr. Leonard Kleinrock's claim to be "the Father of Modern Data Networking", retrieved April 23, 2015 <a href="http://alexmckenzie.weebly.com/comments-on-kleinrocks-claims.html" target="_blank">http://alexmckenzie.weebly.com/comments-on-kleinrocks-claims.html</a> <a href="#fnref:147" class="footnote-back-ref">↩</a></li>
<li id="fn:148">Robert Taylor (November 22, 2001), "Birthing the Internet: Letters From the Delivery Room; Disputing a Claim", New York Times <a href="/wiki/Robert_Taylor_(computer_scientist)" target="_blank">/wiki/Robert_Taylor_(computer_scientist)</a> <a href="#fnref:148" class="footnote-back-ref">↩</a></li>
<li id="fn:149">Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon & Schuster. pp. 244–6. ISBN 9781476708690. <a href="9781476708690" target="_blank">9781476708690</a> <a href="#fnref:149" class="footnote-back-ref">↩</a></li>
<li id="fn:150">Leonard Kleinrock, Leonard Kleinrock - UCLA Dept. of Computer Science, archived from the original on December 5, 2023, He developed the mathematical theory of data networks, the technology underpinning the Internet, while a graduate student at MIT in the period from 1960-1962. In that work, he also modeled the packetization of messages and solved for a key performance gain that packetization provides. <a href="https://web.archive.org/web/20231205193349/https://www.lk.cs.ucla.edu/index.html" target="_blank">https://web.archive.org/web/20231205193349/https://www.lk.cs.ucla.edu/index.html</a> <a href="#fnref:150" class="footnote-back-ref">↩</a></li>
<li id="fn:151">"Letters to the editor", IEEE Communications, February 2011, doi:10.1109/MCOM.2011.5706298 <a href="https://ieeexplore.ieee.org/document/5706298" target="_blank">https://ieeexplore.ieee.org/document/5706298</a> <a href="#fnref:151" class="footnote-back-ref">↩</a></li>
<li id="fn:152">Haughney Dare-Bryan, Christine (June 22, 2023). Computer Freaks (Podcast). Chapter Two: In the Air. Inc. Magazine. <a href="https://www.inc.com/computerfreaks" target="_blank">https://www.inc.com/computerfreaks</a> <a href="#fnref:152" class="footnote-back-ref">↩</a></li>
<li id="fn:153">"The real story of how the Internet became so vulnerable". Washington Post. Archived from the original on 2015-05-30. Retrieved 2020-02-18. Historians credit seminal insights to Welsh scientist Donald W. Davies and American engineer Paul Baran <a href="https://web.archive.org/web/20150530231409/http://www.washingtonpost.com/sf/business/2015/05/30/net-of-insecurity-part-1/" target="_blank">https://web.archive.org/web/20150530231409/http://www.washingtonpost.com/sf/business/2015/05/30/net-of-insecurity-part-1/</a> <a href="#fnref:153" class="footnote-back-ref">↩</a></li>
<li id="fn:154">Pelkey, James L.; Russell, Andrew L.; Robbins, Loring G. (2022). Circuits, Packets, and Protocols: Entrepreneurs and Computer Communications, 1968-1988 (PDF). Morgan & Claypool. p. 4. ISBN 978-1-4503-9729-2. Paul Baran, an engineer celebrated as the co-inventor (along with Donald Davies) of the packet switching technology that is the foundation of digital networks <a href="978-1-4503-9729-2" target="_blank">978-1-4503-9729-2</a> <a href="#fnref:154" class="footnote-back-ref">↩</a></li>
<li id="fn:155">Abbate, Jane (2000). Inventing the Internet. MIT Press. pp. 37–8, 58–9. ISBN 978-0262261333. The NPL group influenced a number of American computer scientists in favor of the new technique, and they adopted Davies's term "packet switching" to refer to this type of network. Roberts also adopted some specific aspects of the NPL design. <a href="978-0262261333" target="_blank">978-0262261333</a> <a href="#fnref:155" class="footnote-back-ref">↩</a></li>
<li id="fn:156">Norberg, Arthur L.; O'Neill, Judy E. (1996). Transforming computer technology: information processing for the Pentagon, 1962-1986. Johns Hopkins studies in the history of technology New series. Baltimore: Johns Hopkins Univ. Press. pp. 153–196. ISBN 978-0-8018-5152-0. Prominently cites Baran and Davies as sources of inspiration, and nowhere mentions Kleinrock's work. <a href="978-0-8018-5152-0" target="_blank">978-0-8018-5152-0</a> <a href="#fnref:156" class="footnote-back-ref">↩</a></li>
<li id="fn:157">A History of the ARPANET: The First Decade (PDF) (Report). Bolt, Beranek & Newman Inc. 1 April 1981. pp. 13, 53 of 183. Archived from the original on 1 December 2012. Aside from the technical problems of interconnecting computers with communications circuits, the notion of computer networks had been considered in a number of places from a theoretical point of view. Of particular note was work done by Paul Baran and others at the Rand Corporation in a study "On Distributed Communications" in the early 1960's. Also of note was work done by Donald Davies and others at the National Physical Laboratory in England in the mid-1960's. ... Another early major network development which affected development of the ARPANET was undertaken at the National Physical Laboratory in Middlesex, England, under the leadership of D. W. Davies. <a href="https://apps.dtic.mil/sti/pdfs/ADA115440.pdf" target="_blank">https://apps.dtic.mil/sti/pdfs/ADA115440.pdf</a> <a href="#fnref:157" class="footnote-back-ref">↩</a></li>
<li id="fn:158">Clarke, Peter (1982). Packet and circuit-switched data networks (PDF) (PhD thesis). Department of Electrical Engineering, Imperial College of Science and Technology, University of London. "Many of the theoretical studies of the performance and design of the ARPA Network were developments of earlier work by Kleinrock ... Although these works concerned message switching networks, they were the basis for a lot of the ARPA network investigations ... The intention of the work of Kleinrock [in 1961] was to analyse the performance of store and forward networks ... Kleinrock [in 1970] extended the theoretical approaches of [his 1961 work] to the early ARPA network." <a href="https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf" target="_blank">https://spiral.imperial.ac.uk/bitstream/10044/1/35864/2/Clarke-PN-1982-PhD-Thesis.pdf</a> <a href="#fnref:158" class="footnote-back-ref">↩</a></li>
<li id="fn:159">"Leonard Kleinrock". UCLA Samueli School Of Engineering. Retrieved 2024-01-20. <a href="https://samueli.ucla.edu/people/leonard-kleinrock/" target="_blank">https://samueli.ucla.edu/people/leonard-kleinrock/</a> <a href="#fnref:159" class="footnote-back-ref">↩</a></li>
<li id="fn:160">Katie Hafner (November 8, 2001), "A Paternity Dispute Divides Net Pioneers", New York Times, The Internet is really the work of a thousand people," Mr. Baran said. "And of all the stories about what different people have done, all the pieces fit together. It's just this one little case that seems to be an aberration. <a href="https://www.nytimes.com/2001/11/08/technology/a-paternity-dispute-divides-net-pioneers.html?pagewanted=all" target="_blank">https://www.nytimes.com/2001/11/08/technology/a-paternity-dispute-divides-net-pioneers.html?pagewanted=all</a> <a href="#fnref:160" class="footnote-back-ref">↩</a></li>
<li id="fn:161">Isaacson, Walter (2014). The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution. Simon & Schuster. pp. 244–6. ISBN 9781476708690. <a href="9781476708690" target="_blank">9781476708690</a> <a href="#fnref:161" class="footnote-back-ref">↩</a></li>
<li id="fn:162">Harris, Trevor, University of Wales (2009). Pasadeos, Yorgo (ed.). "Who is the Father of the Internet? The Case for Donald Davies". Variety in Mass Communication Research. ATINER: 123–134. ISBN 978-960-6672-46-0. Archived from the original on May 2, 2022. Leonard Kleinrock and Lawrence (Larry) Roberts, neither of whom were directly involved in the invention of packet switching ... Dr Willis H. Ware, Senior Computer Scientist and Research at the RAND Corporation, notes that Davies (and others) were troubled by what they regarded as in appropriate claims on the invention of packet switching{{cite journal}}: CS1 maint: multiple names: authors list (link) <a href="978-960-6672-46-0" target="_blank">978-960-6672-46-0</a> <a href="#fnref:162" class="footnote-back-ref">↩</a></li>
<li id="fn:163">"Letters to the editor", IEEE Communications, February 2011, doi:10.1109/MCOM.2011.5706298 <a href="https://ieeexplore.ieee.org/document/5706298" target="_blank">https://ieeexplore.ieee.org/document/5706298</a> <a href="#fnref:163" class="footnote-back-ref">↩</a></li>
<li id="fn:164">Russell, Andrew (2012). Histories of Networking vs. the History of the Internet (PDF). 2012 SIGCIS Workshop. p. 6. <a href="https://arussell.org/papers/russell-SIGCIS-2012.pdf" target="_blank">https://arussell.org/papers/russell-SIGCIS-2012.pdf</a> <a href="#fnref:164" class="footnote-back-ref">↩</a></li>
<li id="fn:165">Tanenbaum, Andrew S.; Wetherall, David (2011). Computer networks (PDF) (5th ed.). Boston Amsterdam: Prentice Hall. p. 57. ISBN 978-0-13-212695-3. Roberts bought the idea and presented a some what vague paper about it at the ACM SIGOPS Symposium on Operating System Principles held in Gatlinburg, Tennessee in late 1967 <a href="978-0-13-212695-3" target="_blank">978-0-13-212695-3</a> <a href="#fnref:165" class="footnote-back-ref">↩</a></li>
<li id="fn:166">X.25 Virtual Circuits - TRANSPAC in France - Pre-Internet Data Networking, doi:10.1109/MCOM.2010.5621965, S2CID 23639680 <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:166" class="footnote-back-ref">↩</a></li>
<li id="fn:167">Pildush, G. "Interview with the author (of an MPLS-based VPN article)". Archived from the original on 2007-09-29. <a href="https://web.archive.org/web/20070929150800/http://www.certificationzone.com/cisco/newsletter/SL/interview_08-12-03.html" target="_blank">https://web.archive.org/web/20070929150800/http://www.certificationzone.com/cisco/newsletter/SL/interview_08-12-03.html</a> <a href="#fnref:167" class="footnote-back-ref">↩</a></li>
<li id="fn:168">Yates, David M. (1997). Turing's Legacy: A History of Computing at the National Physical Laboratory 1945-1995. National Museum of Science and Industry. pp. 132–34. ISBN 978-0-901805-94-2. Davies's invention of packet switching and design of computer communication networks ... were a cornerstone of the development which led to the Internet <a href="978-0-901805-94-2" target="_blank">978-0-901805-94-2</a> <a href="#fnref:168" class="footnote-back-ref">↩</a></li>
<li id="fn:169">Feder, Barnaby J. (2000-06-04). "Donald W. Davies, 75, Dies; Helped Refine Data Networks". The New York Times. ISSN 0362-4331. Retrieved 2020-01-10. Donald W. Davies, who proposed a method for transmitting data that made the Internet possible <a href="https://www.nytimes.com/2000/06/04/business/donald-w-davies-75-dies-helped-refine-data-networks.html" target="_blank">https://www.nytimes.com/2000/06/04/business/donald-w-davies-75-dies-helped-refine-data-networks.html</a> <a href="#fnref:169" class="footnote-back-ref">↩</a></li>
<li id="fn:170">Berners-Lee, Tim (1999), Weaving the Web: The Past, Present and Future of the World Wide Web by its Inventor, London: Orion, p. 7, ISBN 0-75282-090-7 "The advances by Donald Davies, by Paul Baran, and by Vint Cerf, Bob Khan and colleagues had already happened in the 1970s but were only just becoming pervasive." <a href="0-75282-090-7" target="_blank">0-75282-090-7</a> <a href="#fnref:170" class="footnote-back-ref">↩</a></li>
<li id="fn:171">Harris, Trevor, University of Wales (2009). Pasadeos, Yorgo (ed.). "Who is the Father of the Internet? The Case for Donald Davies". Variety in Mass Communication Research. ATINER: 123–134. ISBN 978-960-6672-46-0. Archived from the original on May 2, 2022.{{cite journal}}: CS1 maint: multiple names: authors list (link) <a href="978-960-6672-46-0" target="_blank">978-960-6672-46-0</a> <a href="#fnref:171" class="footnote-back-ref">↩</a></li>
<li id="fn:172">Archives, L. A. Times (2000-06-03). "Donald W. Davies; Work Led to the Internet". Los Angeles Times. Retrieved 2024-01-21. <a href="https://www.latimes.com/archives/la-xpm-2000-jun-03-me-36923-story.html" target="_blank">https://www.latimes.com/archives/la-xpm-2000-jun-03-me-36923-story.html</a> <a href="#fnref:172" class="footnote-back-ref">↩</a></li>
<li id="fn:173">"Treorchy internet pioneer Donald Davies honoured". BBC News. 2013-07-25. Retrieved 2024-07-01. [Davies] is widely known in America which continued his computer work <a href="https://www.bbc.com/news/uk-wales-23446159" target="_blank">https://www.bbc.com/news/uk-wales-23446159</a> <a href="#fnref:173" class="footnote-back-ref">↩</a></li>
<li id="fn:174">Roberts, Lawrence G. (November 1978). "The Evolution of Packet Switching" (PDF). IEEE Invited Paper. Archived from the original (PDF) on 31 December 2018. Retrieved September 10, 2017. In nearly all respects, Davies' original proposal, developed in late 1965, was similar to the actual networks being built today. <a href="https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf" target="_blank">https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf</a> <a href="#fnref:174" class="footnote-back-ref">↩</a></li>
<li id="fn:175">Needham, R. M. (2002). "Donald Watts Davies, C.B.E. 7 June 1924 – 28 May 2000". Biographical Memoirs of Fellows of the Royal Society. 48: 87–96. doi:10.1098/rsbm.2002.0006. S2CID 72835589. The 1967 Gatlinburg paper was influential on the development of ARPAnet, which might otherwise have been built with less extensible technology. ... Davies was invited to Japan to lecture on packet switching. <a href="/wiki/Roger_Needham" target="_blank">/wiki/Roger_Needham</a> <a href="#fnref:175" class="footnote-back-ref">↩</a></li>
<li id="fn:176">Moore, Roger D. (August 2006). "This is a temporary index for a collection of papers about packet-switching in the 1970s". Archived from the original on 24 July 2017. Retrieved 5 September 2017. <a href="https://web.archive.org/web/20170724223235/http://rogerdmoore.ca/PS/" target="_blank">https://web.archive.org/web/20170724223235/http://rogerdmoore.ca/PS/</a> <a href="#fnref:176" class="footnote-back-ref">↩</a></li>
<li id="fn:177">Kirstein, Peter T. (1973). "A SURVEY OF PRESENT AMD PLANNED GENERAL PURPOSE EUROPEAN DATA AND COMPUTER NETWORKS". Archived from the original on 2 March 2017. Retrieved 5 September 2017. <a href="https://web.archive.org/web/20170302092943/http://rogerdmoore.ca/PS/Kirs1973/Ki.html" target="_blank">https://web.archive.org/web/20170302092943/http://rogerdmoore.ca/PS/Kirs1973/Ki.html</a> <a href="#fnref:177" class="footnote-back-ref">↩</a></li>
<li id="fn:178">National Research Council (U.S.). National Research Network Review Committee, Leonard Kleinrock; et al. (1988). Toward a National Research Network. National Academies. p. 40. ISBN 9780309581257. <a href="9780309581257" target="_blank">9780309581257</a> <a href="#fnref:178" class="footnote-back-ref">↩</a></li>
<li id="fn:179">Roberts, Dr. Lawrence G. (November 1978). "The Evolution of Packet Switching". Archived from the original on 24 March 2016. Retrieved 5 September 2017. <a href="https://web.archive.org/web/20160324033133/http://www.packet.cc/files/ev-packet-sw.html" target="_blank">https://web.archive.org/web/20160324033133/http://www.packet.cc/files/ev-packet-sw.html</a> <a href="#fnref:179" class="footnote-back-ref">↩</a></li>
<li id="fn:180">"A SURVEY OF THE CAPABILITIES OF 8 PACKET SWITCHING NETWORKS". 1975. Archived from the original on 26 April 2017. Retrieved 5 September 2017. Research in packet switching networks at the British National Physical Laboratory (NPL) predates ARPANET, having commenced in 1966. <a href="https://web.archive.org/web/20170426104253/http://rogerdmoore.ca/PS/Wood.html" target="_blank">https://web.archive.org/web/20170426104253/http://rogerdmoore.ca/PS/Wood.html</a> <a href="#fnref:180" class="footnote-back-ref">↩</a></li>
<li id="fn:181">John S, Quarterman; Josiah C, Hoskins (1986). "Notable computer networks". Communications of the ACM. 29 (10): 932–971. doi:10.1145/6617.6618. S2CID 25341056. The first packet-switching network was implemented at the National Physical Laboratories in the United Kingdom. It was quickly followed by the ARPANET in 1969. <a href="https://doi.org/10.1145%2F6617.6618" target="_blank">https://doi.org/10.1145%2F6617.6618</a> <a href="#fnref:181" class="footnote-back-ref">↩</a></li>
<li id="fn:182">Haughney Dare-Bryan, Christine (June 22, 2023). Computer Freaks (Podcast). Chapter Two: In the Air. Inc. Magazine. 35:55 minutes in. Leonard Kleinrock: Donald Davies ... did make a single node packet switch before ARPA did <a href="https://www.inc.com/computerfreaks" target="_blank">https://www.inc.com/computerfreaks</a> <a href="#fnref:182" class="footnote-back-ref">↩</a></li>
<li id="fn:183">Roberts, Lawrence G. (November 1978). "The Evolution of Packet Switching" (PDF). IEEE Invited Paper. Archived from the original (PDF) on 31 December 2018. Retrieved September 10, 2017. In nearly all respects, Davies' original proposal, developed in late 1965, was similar to the actual networks being built today. <a href="https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf" target="_blank">https://web.archive.org/web/20181231092936/http://www.ismlab.usf.edu/dcom/Ch10_Roberts_EvolutionPacketSwitching_IEEE_1978.pdf</a> <a href="#fnref:183" class="footnote-back-ref">↩</a></li>
<li id="fn:184">Bennett, Richard (September 2009). "Designed for Change: End-to-End Arguments, Internet Innovation, and the Net Neutrality Debate" (PDF). Information Technology and Innovation Foundation. pp. 7, 9, 11. Retrieved 11 September 2017. Two significant packet networks preceded the TCP/IP Internet: ARPANET and CYCLADES. The designers of the Internet borrowed heavily from these systems, especially CYCLADES ... The first end-to-end research network was CYCLADES, designed by Louis Pouzin at IRIA in France with the support of BBN's Dave Walden and Alex McKenzie and deployed beginning in 1972. <a href="https://www.itif.org/files/2009-designed-for-change.pdf" target="_blank">https://www.itif.org/files/2009-designed-for-change.pdf</a> <a href="#fnref:184" class="footnote-back-ref">↩</a></li>
<li id="fn:185">Abbate, Janet (2000). Inventing the Internet. MIT Press. pp. 124–127. ISBN 978-0-262-51115-5. In fact, CYCLADES, unlike ARPANET, had been explicitly designed to facilitate internetworking; it could, for instance, handle varying formats and varying levels of service <a href="978-0-262-51115-5" target="_blank">978-0-262-51115-5</a> <a href="#fnref:185" class="footnote-back-ref">↩</a></li>
<li id="fn:186">Taylor, Steve; Jim Metzler (2008). "Vint Cerf on why TCP/IP was so long in coming". Archived from the original on 2013-06-21. Retrieved 2013-08-30. <a href="https://web.archive.org/web/20130621100237/http://www.networkworld.com/newsletters/frame/2008/0128wan1.html" target="_blank">https://web.archive.org/web/20130621100237/http://www.networkworld.com/newsletters/frame/2008/0128wan1.html</a> <a href="#fnref:186" class="footnote-back-ref">↩</a></li>
<li id="fn:187">Oppenheimer, Alan (January 2004). "A History of Macintosh Networking". MacWorld Expo. Archived from the original on 2006-10-16. <a href="https://web.archive.org/web/20061016132614/http://www.opendoor.com/nethistory/MacWorld2004/index.html" target="_blank">https://web.archive.org/web/20061016132614/http://www.opendoor.com/nethistory/MacWorld2004/index.html</a> <a href="#fnref:187" class="footnote-back-ref">↩</a></li>
<li id="fn:188">Sidhu, Gursharan; Andrews, Richard; Oppenheiner, Alan (1989). Inside AppleTalk (2 ed.). Addison-Wesley. ISBN 0-201-55021-0. <a href="0-201-55021-0" target="_blank">0-201-55021-0</a> <a href="#fnref:188" class="footnote-back-ref">↩</a></li>
<li id="fn:189">Oppenheimer, Alan (January 2004). "A History of Macintosh Networking". MacWorld Expo. Archived from the original on 2006-10-16. <a href="https://web.archive.org/web/20061016132614/http://www.opendoor.com/nethistory/MacWorld2004/index.html" target="_blank">https://web.archive.org/web/20061016132614/http://www.opendoor.com/nethistory/MacWorld2004/index.html</a> <a href="#fnref:189" class="footnote-back-ref">↩</a></li>
<li id="fn:190">Titus, Tim. "42 Dead Networking Technologies and What Killed Them". www.pathsolutions.com. Retrieved 2023-09-23. <a href="https://www.pathsolutions.com/blog/42-dead-networking-technologies" target="_blank">https://www.pathsolutions.com/blog/42-dead-networking-technologies</a> <a href="#fnref:190" class="footnote-back-ref">↩</a></li>
<li id="fn:191">Martel, C. C.; J. M. Cunningham; M. S. Grushcow. "THE BNR NETWORK: A CANADIAN EXPERIENCE WITH PACKET SWITCHING TECHNOLOGY". IFIP Congress 1974. pp. 10–14. Archived from the original on 2013-10-20. Retrieved 2013-08-30. <a href="https://web.archive.org/web/20131020142453/http://rogerdmoore.ca/PS/BNR/BNRnet.html" target="_blank">https://web.archive.org/web/20131020142453/http://rogerdmoore.ca/PS/BNR/BNRnet.html</a> <a href="#fnref:191" class="footnote-back-ref">↩</a></li>
<li id="fn:192">"A Technical History of CYCLADES". Technical Histories of the Internet & other Network Protocols. Computer Science Department, University of Texas Austin. Archived from the original on 2013-09-01. <a href="https://web.archive.org/web/20130901092641/http://www.cs.utexas.edu/users/chris/think/Cyclades/index.shtml" target="_blank">https://web.archive.org/web/20130901092641/http://www.cs.utexas.edu/users/chris/think/Cyclades/index.shtml</a> <a href="#fnref:192" class="footnote-back-ref">↩</a></li>
<li id="fn:193">Zimmermann, Hubert (August 1977). "The Cyclades Experience-Results and Impacts". IFIP Congress 1977. Toronto: 465–469. <a href="https://dblp.org/rec/conf/ifip/Zimmermann77" target="_blank">https://dblp.org/rec/conf/ifip/Zimmermann77</a> <a href="#fnref:193" class="footnote-back-ref">↩</a></li>
<li id="fn:194">Digital Equipment Corporation, Nineteen Fifty-Seven to the Present (PDF), Digital Equipment Corporation, 1978, p. 53, archived from the original (PDF) on 2017-06-30 <a href="https://web.archive.org/web/20170630025909/http://archive.computerhistory.org/resources/text/dec/dec.digital_1957_to_the_present_(1978).1957-1978.102630349.pdf" target="_blank">https://web.archive.org/web/20170630025909/http://archive.computerhistory.org/resources/text/dec/dec.digital_1957_to_the_present_(1978).1957-1978.102630349.pdf</a> <a href="#fnref:194" class="footnote-back-ref">↩</a></li>
<li id="fn:195">Wood, David C. (1975). "A Survey of the Capabilities of 8 Packet Switching Networks". Proceedings of Symposium on Computer Networks. Archived from the original on 2020-08-06. Retrieved 2020-03-13. <a href="https://web.archive.org/web/20200806042839/http://rogerdmoore.ca/PS/Wood.html#DDX" target="_blank">https://web.archive.org/web/20200806042839/http://rogerdmoore.ca/PS/Wood.html#DDX</a> <a href="#fnref:195" class="footnote-back-ref">↩</a></li>
<li id="fn:196">Barber, D L. (1975). "Cost project 11". ACM SIGCOMM Computer Communication Review. 5 (3): 12–15. doi:10.1145/1015667.1015669. S2CID 28994436. <a href="https://doi.org/10.1145%2F1015667.1015669" target="_blank">https://doi.org/10.1145%2F1015667.1015669</a> <a href="#fnref:196" class="footnote-back-ref">↩</a></li>
<li id="fn:197">Scantlebury, Roger (1986). "X.25 - past, present and future". In Stokes, A. V. (ed.). Communications Standards: State of the Art Report. Pergamon. pp. 203–216. ISBN 978-1-4831-6093-1. <a href="978-1-4831-6093-1" target="_blank">978-1-4831-6093-1</a> <a href="#fnref:197" class="footnote-back-ref">↩</a></li>
<li id="fn:198">"EIN (European Informatics Network)". Computer History Museum. Retrieved 2020-02-05. <a href="https://www.computerhistory.org/revolution/networking/19/375/2062" target="_blank">https://www.computerhistory.org/revolution/networking/19/375/2062</a> <a href="#fnref:198" class="footnote-back-ref">↩</a></li>
<li id="fn:199">"European cooperation in the field of scientific and technical research (COST), 1971-". <a href="https://cordis.europa.eu/programme/id/IC-COST/fr" target="_blank">https://cordis.europa.eu/programme/id/IC-COST/fr</a> <a href="#fnref:199" class="footnote-back-ref">↩</a></li>
<li id="fn:200">Abbate, Janet (2000). Inventing the Internet. MIT Press. p. 125. ISBN 978-0-262-51115-5. <a href="978-0-262-51115-5" target="_blank">978-0-262-51115-5</a> <a href="#fnref:200" class="footnote-back-ref">↩</a></li>
<li id="fn:201">Barber, D. L. A. and Laws, J. (February 1979). “A basic mail scheme for EIN,” International Network Working Group (INWG), Note no. 192. <a href="#fnref:201" class="footnote-back-ref">↩</a></li>
<li id="fn:202">Davies, Donald Watts (1979). Computer networks and their protocols. John Wiley & Sons. pp. 464. ISBN 9780471997504. <a href="9780471997504" target="_blank">9780471997504</a> <a href="#fnref:202" class="footnote-back-ref">↩</a></li>
<li id="fn:203">Hardy, Daniel; Malleus, Guy (2002). Networks: Internet, Telephony, Multimedia: Convergences and Complementarities. Springer Science & Business Media. p. 505. ISBN 978-3-540-00559-9. <a href="978-3-540-00559-9" target="_blank">978-3-540-00559-9</a> <a href="#fnref:203" class="footnote-back-ref">↩</a></li>
<li id="fn:204">Derek Barber. "The Origins of Packet Switching". Computer Resurrection Issue 5. Retrieved 2024-06-05. I actually set up the first meeting between John Wedlake of the British Post Office and [Rémi Després] of the French PTT which led to X25. There was a problem about virtual calls in EIN, so I called this meeting and that actually did in the end lead to X25. <a href="http://www.cs.man.ac.uk/CCS/res/res05.htm#f" target="_blank">http://www.cs.man.ac.uk/CCS/res/res05.htm#f</a> <a href="#fnref:204" class="footnote-back-ref">↩</a></li>
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</ol>

Packet switching open-in-new

Packet switching