Multiplex communications – Fault recovery – Bypass an inoperative station
Patent
1996-06-27
1998-05-05
Kizou, Hassan
Multiplex communications
Fault recovery
Bypass an inoperative station
370228, 340827, H04L 1224
Patent
active
057486115
ABSTRACT:
A system and method for restoration of a disrupted telecommunications path between a source node and a destination node via at least one tandem node. The operation of the present invention proceeds in five phases: notification, broadcast, path trace-out, confirmation and cleanup. In the notification phase, the path's source and destination nodes are notified of the disruption. In the broadcast phase, the network is flooded with PACK messages to locate restoration paths; selective rebroadcasting of the PACK messages limits the volume of restoration message traffic. In the path trace-out phase, bandwidth is conservatively reserved along the restoration paths indicated by the PACK messages. In the confirmation phase, restoration paths are built up step-wise along the traced-out paths, thereby restoring the disrupted path between the source and destination nodes. In the clean-up phase, all of the network resources that were allocated to restoration of the disrupted path, and that are no longer needed, are released.
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Allen John David
Chow Ching-Hua
Shah Jasvantrai C.
Kizou Hassan
MCI Corporation
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