Automated main distribution frame

Automated Main Distribution Frame (AMDF), (automated switching matrix, automated distribution frame, Loop Management System (LMS)), a technology to provide connectivity between subscriber (local loop, outside plant) - and office equipment (inside plant) lines in a telephone exchange (central office, CO) main distribution frame (MDF).

As of today the connections (n-subscriber lines and m-office equipment lines) are established or removed manually using a drilled pair of copper wires (jumper).

An automated main distribution frame provides, after an initial installation of all relevant subscriber- and office equipment lines, remote controlled and localy performed connectivity by switching via the switching matrix of an AMDF.

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 being most relevant in small exchanges which are declining due to the use of Integrated Subscriber Loop Carrier and other advances, they are seldom seen as offsetting the initial cost.

External links: IEC [1]