Multiplex communications – Fault recovery
Reexamination Certificate
2001-08-15
2010-06-15
Moe, Aung S (Department: 2474)
Multiplex communications
Fault recovery
C370S217000, C370S237000, C370S242000, C370S254000, C370S256000, C370S400000, C370S408000, C398S001000, C398S017000, C398S025000, C398S057000
Reexamination Certificate
active
07738359
ABSTRACT:
A system, device, and method for managing alternate site switching in an optical communication system recovers from failures/degradations that are uncorrected by the core optical communication network. When an uncorrected failure/degradation is detected, communications for a protected end-system are switched from a primary end-system to a backup end-system. The backup end-system may be selected a priori, for example, during connection establishment, in order to reduce switching time once a decision has been made to switch communications from the primary end-system to the backup end-system. Provisions are made for completing the alternate site switching within a specified amount of time. Load balancing may be used to further reduce switching time from the primary end-system to the backup end-system. This alternate site switching augments the various protection mechanisms provided by the core optical communication network in order to provide end-to-end protection for the optical communication path.
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Hardjono Thomas P.
Monga Indermohan S.
Schofield Bruce A.
Suryaputra Stephen
Anderson Gorecki & Manaras LLP
Grey Christopher P
Moe Aung S
Nortel Networks Limited
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