Disjoint shared protection
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United States of America Patent
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N/A
Issued Date -
Dec 19, 2002
app pub date -
Apr 8, 2002
filing date -
Apr 6, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and apparatus for providing signaling for disjoint shared protection in a data network are presented. In a preferred embodiment the method utilizes one or more of the same set of finite optical signals used for maintenance purposes in the network, which can be recognized without regard to bit rate or format. Nodes that share a failed link send an alarm signal that reaches the initiator and terminator node, whereupon the initiator node sends a signal that activates a protection lightpath. When the signal sent by the initiator node arrives at the terminator node, it sends back an acknowledge signal. If the acknowledge signal is not received within a certain time protection is voided. Contention for shared protection resources is resolved via a priority scheme.
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