Telephone exchange

Details Telephone exchange Telephone exchange

1987-06-08

1989-02-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 681, H04Q 1104

Patent

active

048092606

ABSTRACT:
An automatic telephone exchange, such as a PABX, includes a number of group control units (GCU1 to GCU4) each of which is a simplified version of the system of U.S. Pat. No. 4581733. These are connected via respective PCM highways to a central switch, which is an electronic time space switch, and a central controller. The central controller does the major part of the call setting and control, all calls being set up via the central switch.

REFERENCES:
patent: 4575839 (1986-03-01), Ogata et al.
patent: 4644528 (1987-02-01), Ahmad et al.
patent: 4654845 (1987-03-01), Mukerji
patent: 4656621 (1987-04-01), Cooperman et al.

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