| 摘要 |
Proposed is a method of raising a loss of frame alarm in an optical transmission network at an optical network element. The method comprises the steps of detecting an out-of-frame (OOF) state, detecting a presence of the OOF state, by filtering the OOF state in time using at least one time window, detecting a loss of frame defect , in case the presence of the OOF state is detected, determining a defect correlation, by correlating the loss of frame defect with one or more further defects, and finally, in case of a presence of the defect correlation, instantaneously detecting a frame failure and raising a loss of frame alarm. |
