Modular self-routing pcm switching exchange with virtual...

Details Modular self-routing pcm switching exchange with virtual... Modular self-routing pcm switching exchange with virtual...

H - Electricity

04

Q

344/25

H04Q 11/04 (2006.01)

Patent

CA 1206240

ABSTRACT A PCM switching network based on the use of switching units each equipped with a local controller using a microprocessor, ancillary circuits for diagnosis, ancillary circuits for ex- changing messages relating to network control between the local controllers and between local controllers and the distributed telephone control units, and ancillary circuits providing virtual channels for transmission of the messages in a direction opposite to that of speech. The switching units make it possible to provide self-routing modular PCM switching network structures for distributed control tele- phone exchanges.

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