A Survivable Solution for SDH over WDM Networks

A Survivable Solution for SDH over WDM networks is proposed in this paper The key issues associated with lightpath-based 1+1 multiplex section protecion (MSP) and 2 optical channel multiplex section/shared protection ring (2OCH MS/SPRing) are discussed. According to the requirements of transfer rate and recover time of the traffic between different node pairs, lightpath-based 1+1 MSP and 2OCH MS/SPRing are chosen to provide efficient transporting and protection functions. With protected SDH over unprotected WDM optical layer, all the traffic can be protected efficiently.