Synchronous/asynchronous system having function of switching pat

Details Synchronous/asynchronous system having function of switching pat Synchronous/asynchronous system having function of switching pat

1994-07-29

1996-02-13

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

370 14, 371 206, H04J 314

Patent

active

054916968

ABSTRACT:
A composite asynchronous/synchronous system switches signal paths at the time of a fault and uses a route diversity function even when a fault occurs in the asynchronous mode signal. The composite system includes asynchronous system fault notifying circuit in each of the connection offices connecting the synchronous communication system and the asynchronous communication system. When an asynchronous system alarm indication signal AIS shows suspension of the asynchronous mode signal or a fault in the signal, the notifying circuit converts a fault detection signal to information recognizable in the synchronous mode and sends the information to an asynchronous system fault path switching circuit which is provided in the path termination office. The switching circuit detects the fault detection signal generated in the asynchronous mode, or receives the fault detection signal sent from the asynchronous system fault notifying circuit, and switches paths formed on ring-like transmission lines.

REFERENCES:
patent: 4506357 (1985-03-01), Nakayashiki et al.
patent: 4835763 (1989-05-01), Lau
patent: 5159595 (1992-10-01), Flanagan et al.
patent: 5265096 (1993-11-01), Parruck
patent: 5278824 (1994-01-01), Kremer
patent: 5282200 (1994-01-01), Dempsey et al.
patent: 5307343 (1994-04-01), Bostica et al.

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