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4. SLC 96

The SLC-96 system is a D4 (4th-generation channel bank) digital Subscriber Loop Carrier system that can carry up to 96 subscriber channels (when fully equipped) between a Central Office Terminal (COT) and a Remote Terminal (RT) using T1 digital lines. Typical economic applications are for expanding the service capability of existing cable plant or for new wire center deferral. In addition to Message Telephone Service (MTS), the system can provide coin services, voice-frequency special services, and digital data services. The SLC-96 system is based on the transmission and physical format of the D4 system used for interoffice trunks. The system employs μ255 pulse code modulation (PCM) for voice transmission and, as a result, will allow the direct interface of the RT with a digital central office. Its maintenance features include channel and drop testing from a local test desk; single-ended, active, T1 fault-locating; automatic T1 line protection; extensive local and remote alarm displays; and outputs that can be transmitted to a remote operations center such as the Switching Control Center (SCC). The channel and drop testing scheme requires a Pair Gain Test Controller (PGTC) to be installed in each wire center containing one or more SLC-96 systems. Various other features that will enhance the application of the SLC-96 system in the loop plant include extended range channel units, remote T1 line power feed, and a variety of RT enclosures.