Line-level path protection in the optical layer

Details Line-level path protection in the optical layer Line-level path protection in the optical layer

2006-05-30

2006-05-30

Pham, Chi (Department: 2667)

Multiplex communications

Fault recovery

C370S221000, C370S242000, C370S408000

Reexamination Certificate

active

07054262

ABSTRACT:
Systems and methods provide very fast protection switching while leaving selected traffic unprotected. When a link fails, only certain pre-selected paths are rerouted at the point of failure. Other traffic is left unprotected or protected at another layer. Signaling of the failure and the rerouting is performed for the link as a whole rather than for the individual paths. Signaling occurs at a first layer of a digital transmission hierarchy while path rerouting switching occurs at a second hierarchical layer above the first layer. In certain implementations, K1/K2 bytes are used in signaling at the optical line layer (OC-n), while only protected High-Order paths (STS) and Low-Order paths (VT) are protected by the protection switch.

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ITU-T, G.841, Series G: Transmission Systems and Media, Digital Systems and Networks, Digital transmission systems—Digital networks—SDH network characteristics, Types and characteristics of SDH network protection architectures, Oct. 1998.

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