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Abstract

A two-way broadband audio telephone communications system using 2B1Q line coding between a program amplifier located at a remote site and the central office. The program amplifier includes a codec to convert analog audio signals to digital data at a predetermined sampling rate, and a 2B1Q transceiver to convert the digital data into 2B1Q signals. The program amplifier communicates with a channel unit in the central office channel bank over a conventional two-wire link. This channel unit includes a 2B1Q transceiver that translates the 2B1Q signals received from the program amplifier into PCM format compatible with the T1 carrier system. In order to provide wide bandwidth, the channel unit is allocated at least two channels in each T1 frame. The central office channel bank can communicate with any other similarly equipped channel bank over the T1 carrier. For example, at the other end of the T1 carrier, a second central office channel bank includes channel unit with a 2B1Q transceiver that converts the T1 data from the corresponding channels in each frame into 2B1Q format. The second central office communicates these 2B1Q signals over a two-wire link with a second program amplifier having a 2B1Q transceiver and a codec for two-way conversion into analog audio signals.

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First Claim