Multiplex communications – Fault recovery – Bypass an inoperative channel
Patent
1995-12-14
1998-01-27
Safourek, Benedict V.
Multiplex communications
Fault recovery
Bypass an inoperative channel
370410, 371 682, H04L 122
Patent
active
057128472
ABSTRACT:
Switches connected via transmission lines, wherein one switch has a bidirectional mode, while the other switch has a unidirectional mode. To realize line switching when a failure occurs, the switches function to switch signals from a working transmission line to a protection transmission line. The switch having the bidirectional mode switches concurrently both first and second direction paths from a working transmission line to a protection transmission line. The switch having the unidirectional mode switches either one of the first and second direction paths from the working transmission line to the protection path. When the second switch switches to send signals via the first direction path of the protection transmission, the first switch notifies the second switch as if a fault occurred in the second direction path of the working transmission line.
REFERENCES:
patent: 4967406 (1990-10-01), Yagi et al.
patent: 5069521 (1991-12-01), Hardwick
patent: 5220563 (1993-06-01), Grenot et al.
patent: 5479396 (1995-12-01), Kusano
"Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria" (Incremental Proposed Requirements to TR-NWT-000253, Issure 2).
Fujitsu Limited
Safourek Benedict V.
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