Patent ID: 8755686

Claim:
A method for processing failures of a multi-span segment working channel in a ring optical transport network (OTN), comprising: extending a fifth node state, 1+1 switching state, in addition to four node states, an idle state, an A direction switching state, a B direction switching state and a pass-through state in a channel shared protection of the ring OTN; detecting alarm information in the ring OTN in real-time; and when generation of only one or more working Optical Data Unit k (ODUk) alarms without any other alarms in the ring OTN is detected, performing a switching process of a 1+1 protection protocol on services carried on a working channel on which an alarm is generated, wherein add and drop nodes of a span segment where each working ODUk alarm is situated are in the 1+1 switching state; when there is one working ODUk alarm exist in the ring OTN and one protection ODUk alarm is generated at the protection ODUk corresponding to the said one working ODUk, performing a switching process of a channel shared protection protocol, wherein the add and drop nodes of a span segment where the protection ODUk alarm is situated are in the A direction switching state or the B direction switching state, and the node by which the protection channel passes is in the pass-through state; when there is one working ODUk alarm exist in the ring OTN and an optical multiplexed segment (OMS) layer alarm is generated in the ring OTN, performing a switching process of a channel shared protection protocol, wherein the add and drop nodes of a span segment where the OMS layer alarm is situated are in the A direction switching state or the B direction switching state, and the node by which the protection channel passes is in the pass-through state.