Patent ID: 8670306

Claim:
A method for service protection, applied to a 1:n switching technique, comprising: sending, by a source end, a service to a work transmission entity; performing, by the work transmission entity, performance monitoring through the service to detect Signal Degrade (SD) faults occurring at the work transmission entity, and receiving, by a sink end, the service from the work transmission entity; switching, by the source end, the service from the work transmission entity to both the work transmission entity and a protection transmission entity, when a Signal Degrade (SD) fault occurs at the work transmission entity, and selecting, by the sink end, to receive the service from the protection transmission entity; performing, by the protection transmission entity, the performance monitoring through the service to detect SD faults occurring at the protection transmission entity; and receiving, by the sink end, the service still from the protection transmission entity, when the SD faults occur at both the work transmission entity and the protection transmission entity.