Patent ID: 7936990

Claim:
A method for traffic protection in Optical Transport Network (OTN), of which nodes are connected through at least two fibers with opposite transmission directions to form a ring topology, comprising: setting a part of channels in one fiber as working channels of an Optical Multiplex Section (OMS) shared protection ring for carrying a group of signals separately, and setting a part of channels in the other fiber with a reverse transmission direction as protection channels, the number of which is equal to that of the working channels, to form one-to-one protection for the working channels; when a failure in an optical line of OTN is detected, determining a bridging node and a switching node in accordance with pre-designated protection strategy, bridging and switching the group of signals to be transmitted through the failed optical line between the working channels and the protection channels at the determined bridging node and switching node; implementing OTN quality detection at each node for the optical signals passing though the node itself, respectively, and deciding whether the quality of the optical signal accords with a Signal Degrade or a Signal Fail condition, if yes, determining that a defect occurs in the optical line passed through by the optical signal, otherwise, determining that the optical line passed through by the optical signal is normal; said Signal Degrade or Signal Fail condition is determined according to one or more indications of Signal Loss, Forward Defect Indication Payload, Forward Defect Indication Overhead, Payload Mismatch, Optical Power Low, Optical Power Difference Over, Accumulative Errors of OTU SM BIP of multiple working channels Over, and Accumulative Errors of OTU SM BIP of multiple working channels Degrade; and providing a setting interface and a query interface for optical power threshold and optical power difference threshold, where the optical power threshold and the optical power difference threshold are set and queried, respectively, through the setting interface and the query interface.