What is SLC-96 and how does it relate to T1?
A4. SLC-96 (pronounced “slick 96”) is used in conjunction with T1 as a digital-loop carrier system, which provides service for up to 96 subscribers over three to five separate T1 lines. SLC-96 was the first widely deployed digital-loop carrier system. SLC-96 operation consists of two terminals: a central-office terminal (COT) and a remote terminal (RT). The COT multiplexes the analog phone lines from a class 5 switch into four T1 lines with an optional fifth T1 line used for protection switching. The RT is the termination point for the T1 lines and converts them into subscriber phone lines. SLC-96 revolutionized the telecommunication industry by introducing digital electronics into the local loop as a permanent replacement for cable. The frame format of SLC-96 closely resembles that of the super-frame (SF or D4) format, except that additional data-link information is transferred in the framing bits. This allows the deployment of advanced functions such as single-party, multiparty, coin
