Effective Fault Management For Hierarchical Otn Multiplexing Using Tandem Connection Monitoring Coordinates

We propose and verify fault management method using tandem connection monitoring for OTN multiplexing hierarchy through experiments on fiber-cut event. Marking defects on TCM coordinates that consists of TCM levels and ODU trails, and identifying a root-cause of faults using two consequent actions of trail signal fail and server signal fail are newly presented as means to find fault-originators and root-causes. By effectively managing multiple faults all over the network and all over the hierarchical OTN layers, the fault management method could contribute toward the enhanced OAM for fast end-to-end service maintenance and fast restoration.