Multiplex communications – Wide area network – Packet switching
Patent
1994-03-09
1996-02-27
Kizou, Hassan
Multiplex communications
Wide area network
Packet switching
370 54, 371 201, 340827, H04L 1224, G06F 1120
Patent
active
054954711
ABSTRACT:
A fast distributed network restoration system and method therefor for restoring disrupted traffic, due to a cut link, in a digital cross-connect system (DCS) network utilizes a two-prong approach whereby both disrupted ends of the cut link simultaneously send out restore messages. To this end, upon detection of a cut link, the end nodes are respectively designated as a Gray Origin node and a Black Origin node. The Gray Origin node begins to broadcast Gray restoration request messages while the Black Origin node begins to broadcast Black restoration request messages to their respective neighbor nodes. As soon as an intermediate node receives one of the restoration request messages, depending on the color attribute of the message, that intermediate node is identified as either a Gray or Black node. Once a network node has received both Gray and Black restoration request messages, a restoration path is identified and that node begins to connect the spare channels of the links over which the request messages arrived. A system for effecting the method of the present invention is also disclosed.
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Bicknell John D.
Chow Ching-Hua
McCaughey Stephen C.
Syed Sami A.
Kizou Hassan
MCI Communications Corporation
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