The System 75 office communication system uses a unique communications and control architecture that provides great flexibility and a minimum of overhead for small configurations while growing smoothly to larger line sizes. A distributed communication network provides 64 kb/s connectivity for both voice and data. It consists of a pair of time division multiplexed buses and intelligent port circuits. Flexible conferencing and gain adjustment are supported as an integral part of the network. The control complex supports an operating‐system‐based software structure.

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