Digital communication system

Details Digital communication system Digital communication system

1981-03-16

1983-08-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 24, 370 62, 370100, 375106, H04J 308

Patent

active

043970303

ABSTRACT:
A digital subscriber terminal equipment is connected to the line circuit at a local exchange via a conventional subscriber line but permits simultaneous transmission of speech and data (e.g., viewdata). The terminal equipment and the line circuit each contain a central unit, a direction-separating unit, and a 10-bit data bus; the terminal equipment also includes a codec with a filter. The central units control the writing and reading of the digital signals into and out of the data bus and form on the subscriber line a main channel for data or speech, an additional channel for control, and an additional data channel.

REFERENCES:
patent: 3924077 (1975-12-01), Blakeslee
patent: 4171467 (1979-10-01), Evenchik
patent: 4205201 (1980-05-01), Kahn
patent: 4287588 (1981-09-01), Segner

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