 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).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).