Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2007-09-25
2007-09-25
To, Doris H. (Department: 2616)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S404000, C370S406000
Reexamination Certificate
active
10191548
ABSTRACT:
A failure protection between interconnected adjacent Resilient Packet Rings (RPRs) in a multiple RPR network is provided. Two paths, a regular message path and a protection path, are provided between two adjacent RPRs. The regular path is used for routing inter-ring messages when no failure has occurred on the path. Messages are rerouted through the protection path when a failure occurs on the regular path. Each of these paths has two RPR interface nodes (one for each RPR) that are connected to an interconnection device (a layer2bridge or a layer-3router) through interconnection links. Procedures for detecting failures and generating notifications for message rerouting and fault reports are executed at the interconnection devices. The procedures use periodic keep alive messages for diagnosing network segment and interconnection device failures. The fault detection and message rerouting are accomplished in less than 50 ms.
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Bacque James Benson
Lee Byoung-Joon
Donnelly Victoria
Moore Ian N.
To Doris H.
Tropic Networks Inc.
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