Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2007-09-11
2007-09-11
Li, Shi K (Department: 2613)
Optical communications
Fault recovery
Bypass inoperative element
C398S005000
Reexamination Certificate
active
10199999
ABSTRACT:
A method for performing protection switching in an optical network does so in an optimal manner by performing the protection switching actions in the various nodes of a protection path in parallel rather than in sequence. To do so, a channel failure message is transmitted from an end node A in the optical network upon detecting a failure in a link in the optical network that includes the end node A. If a failure can be detected at both end nodes, the channel failure messages are transmitted from both end nodes the moment they detect failure without any further waiting. Upon receiving the first channel failure message regardless its originating end node, switching actions in intermediate nodes are initiated. The channel failure messages are forwarded from the intermediate nodes to their corresponding next nodes before completing switching actions in the intermediate nodes. When receiving channel failure response messages, these messages are forwarded to a next node from the intermediate node only after switching actions are complete in the intermediate node. A technique for merging messages in nodes is also disclosed.
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Bonenfant Paul
Iyer Ravichandran
Mang Xiaowen
Rodriguez-Moral Antonio
Sampangi Manjunath
Li Shi K
Mayer & Williams PC
Mayer, Esq. Stuart H.
Meriton Networks US Inc.
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