Working with MSP Groups

Multiplex Section Protection (MSP) is a port level protection supported on the STM-N interfaces. The 1+1 protection scheme uses a complete duplication of services and implies that two identical lines are active at the same time (both working and protection lines are transmitting the same signal) allowing for a transparent switch from the working to the protection line. In other words, the traffic is permanently bridged on both the working and protection lines. The MSP groups can be configured either 1WAY or 2WAY. MSP protection switching is initiated in the event if a fault or alarm in the STM port in the node or by user initiated switching commands.

Protection switching is configured either in revertive or non-revertive mode.

• In revertive mode, traffic switches back to the work channel once the fault condition has cleared, after the Wait To Restore (WTR) period has elapsed.
• In non-revertive mode, traffic remains on the protect channel and does not automatically switch back to the work channel when the fault condition has cleared.

Maximum Number Of Connections

NOTE 1: The local and remote node must be provisioned with the same protection configuration.

NOTE 2: Configure the MSP group before creating the desired cross-connects on the working port.