A SYSTEM AND METHOD FOR OVERLAYING A DSL ACCESS MULTIPLEXER ONTO EXISTING_ACCESS SYSTEMS BY REUSING TEST BUSES

摘要

A digital subscriber line access multiplexer overlay onto a digital loop carrier system for transporting high speed digital data over an existing backplane which carrie r voice, data, and test signals, between voice line cards and a carrier line, the voice signals being time division multiplexed (TDM) into frames, the system comprising: a data bus interface for impressing the high speed data on a subset of existing backplane buses for transport along the backplane and for retrieving high speed digital data from the backplane buses; and a plurality of data line cards for connecting to the backplane and backplane subset conductors, the data line cards being adapted to couple the high seed data between the subscriber line and the backplane, whereby the high speed digital data can b e routed over the backplane subset to any of the digital data line cards without interferi ng with the voice signals routed to voice line cards.