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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 as 1WAY or 2WAY. MSP protection switching can be initiated in the event if a fault or alarm in the STM port in the node or by user initiated switching commands.