Backwards-compatible failure restoration in bidirectional...

Details Backwards-compatible failure restoration in bidirectional... Backwards-compatible failure restoration in bidirectional...

H - Electricity

04

L

H04L 12/42 (2006.01) H04J 3/08 (2006.01) H04Q 11/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2278828

A restoration procedure for use in bidirectional multiplex section-switched ring transmission systems re-establishes a connection path by using a loopback connection at nodes bordering the failure and by then establishing a jumpered connection path, for each active tributary affected by the failure. The jumpered connection path at affected node eliminates any unnecessary loop formed in the re-established connection path caused by the loopback connection at the border nodes. There is stored in memory at each node (1) the provisioned connection path, (2) the jumpered path, and (3) a jumper flag is set indicating that a jumper connection exists. When the failure is cleared the (1) jumpered path is removed and its record erase from memory, (2) the provisioned connection path is restored, and (3) the jumper flag is reset. Advantageously, the this operation can be programmed into existing node controllers and is compatible with existing restoration procedures.

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