Analog display services interface

Analog display services interface (ADSI) is a <a href="/facts/Telephony/2GwTTepw">telephony</a> technology that is used in <a href="/facts/Plain_old_telephone_service/7uEc2wFY">plain old telephone service</a> (POTS) or computer-based <a href="/facts/Private_branch_exchange/eLWvlhzs">private branch exchange</a> (PBX) telephone service. It works in conjunction with a screen-based telephone ("screenphone") or other compatible <a href="/facts/Customer-premises_equipment/dVGqvkWL">customer-premises equipment</a> (CPE) to provide the user with <a href="/facts/Soft_key/BMYaDL6H">soft key</a> access to telephone company or internal PBX custom calling features. It is an <a href="/facts/Analog_signal/xDbb4uB5">analog</a> service because it uses analog <a href="/facts/Frequency-shift_keying/Bp1jJDPX">frequency-shift keying</a> (FSK) technology to interact with an <a href="/facts/LCD/8B6xGBEz">LCD</a> screen via short, low-baud rate, <a href="/facts/Downloads/qN7fWmyI">downloads</a> to refresh and re-program soft keys in real-time.
The technology introduced in the United States and rolled out to <a href="/facts/Regional_Bell_Operating_Companies/9azPk76z">Regional Bell Operating Companies</a> (RBOCs) from <a href="/facts/Bellcore/MBQAkk4J">Bellcore</a> in April 1995, (very soon after the introduction of CLASS-based services through <a href="/facts/Electronic_switching_system/rqHUmBML">electronic switching system</a> (ESS)), was marketed by the RBOCs who implemented it, as a way to streamline all available custom calling options through the use of a screen-based telephone; giving residential and small business telephone subscribers PBX-like functionality at home or in <a href="/facts/Small_office%2fhome_office/3aub8CPG">small office/home office</a> (SOHO) locations at a significantly lower cost. The service debuted before the onslaught of <a href="/facts/Personal_Communications_Service/ESLGz8aF">personal communications service</a> (PCS) and <a href="/facts/Voice_over_IP/5QGBbXYg">voice over Internet protocol</a> (VoIP)-based telephony technologies became available and was originally slated to also work in conjunction with other types of services such as enhanced directory assistance, telephone banking, movie theatre ticket sales, and other services that could interact with an <a href="/facts/LCD/8B6xGBEz">LCD</a>-screen.
Some of those services did become available later, though, not at the dramatic increase the US-based telephone companies had hoped. Canadian telephone companies such as <a href="/facts/Telus_Communications/h58eorGP">Telus</a> and <a href="/facts/Bell_Canada/k3hgDpJA">Bell Canada</a>, however, had much better luck implementing more ADSI-based services with other industries such as banking, and were still marketing the service actively as of 2005.
The service is marketed at telephone customers who subscribe to the majority of <a href="/facts/Custom_Local_Area_Signaling_Services/wAUYkusV">custom local area signaling services</a> (CLASS)-based services offered by their local telephone company (such as <a href="/facts/Caller_ID/hh9DqEEj">caller ID</a>, <a href="/facts/Call_Return/sxDLX8bx">call return</a>, etc.) by the customization of a telephone capable of providing one-touch access to these features. This greatly increases customer usability by alleviating the need to memorize dialing codes such as *69.
Additionally, a few RBOCs introduced new features such as <a href="/facts/Call_Waiting_Deluxe/u7KE4JTo">call waiting deluxe</a> and <a href="/facts/Message_Waiting_Indicator/fNm4tMRY">message waiting indicator</a> to work exclusively with ADSI telephones. The former being perhaps the most involved example of ADSI capabilities and the latter being an example of visual FSK; another new technology available through CLASS.
The RBOCs who offer this service also restructured their billing of these services into value-based "packages" to stimulate customer interest.

Analog display services interface open-in-new

Analog display services interface