Telephone exchange

Details Telephone exchange Telephone exchange

H - Electricity

04

Q

344/25

H04Q 11/04 (2006.01)

Patent

CA 1274301

D.M. Davidson - J.R. Bungard - R.A. Gatward 5-2-2 TELEPHONE EXCHANGE Abstract of the Disclosure 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. Patent 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.

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