| 摘要 |
<p>A method for detecting degraded signal defects is disclosed in the present invention. The method includes: each node on the server layer that the packet transport network (PTN) trail passes detecting degraded signal defects; said each node respectively sending a detection result in the downstream; the last node judging, according to the detection results of the upstream nodes, whether a degraded signal defect occurs or not. With the method provided in the present invention for detecting the degraded signal defects, the sum of the degraded signal defects that occur in the passed regions of the server layer can simulate the signal degradation in the PTN. Therefore, even though there are no data messages carried in the PTN, the degraded signal defect detection can be performed as long as the data messages are carried by the server layer of the PTN, thus the state of the signal degradation is stable and the protection group does not need to switch repeatedly, which decreases the customer data packet loss caused by each switching.</p> |
