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Automated main distribution frame
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<p>Automated main distribution frame (AMDF), (automated switching matrix, automated distribution frame, loop management system (LMS)), a technology to provide connectivity between subscriber (<a href="/facts/Local_loop/rSRfLPaq">local loop</a>, <a href="/facts/Outside_plant/p3Y70bUe">outside plant</a>) – and office equipment (<a href="/facts/Inside_plant/JHVwWuqo">inside plant</a>) lines in a <a href="/facts/Telephone_exchange/PaRpGm8I">telephone exchange</a> (central office, CO) <a href="/facts/Main_distribution_frame/pgpAGcwd">main distribution frame</a> (MDF). </p><p>At the beginning of the 21st century the connections (n-subscriber lines and m-office equipment lines) are established or removed manually using a twisted pair of copper wires (jumper). </p><p>An automated main distribution frame provides, after an initial installation of all relevant subscriber- and office equipment lines, remote controlled and locally performed connectivity by switching via the switching matrix of an AMDF. </p><p>Advantages of automated main distribution frame include reduced switching time, reduced errors in execution and documentation, no truck-roll for each subscriber connection to be established, and reduction of operational expenditures (OPEX). These advantages are typically only off-setting the initial investment in the AMDF equipment in places with relatively high labour cost and an "active" telephony market where subscribers have a choice of multiple service providers leading to many MDF changes. </p>