| 摘要 |
Proposed is a method of localizing the failure occurring along a transmission path. A data signal which comprises an overhead is transmitted along the transmission path. The transmission path comprises a path segment. A first network node is located at the beginning of the path segment. The first network node performs a tandem connection monitoring source function of a tandem connection. A second network node is located at the end of the path segment. The second network node monitors the transmission along the path segment, by performing a tandem connection monitoring sink function, which corresponds to the tandem connection monitoring source function of the first network node. In the case that the first network node detects a failure of the data signal, which occurs before the path segment, the first network node enters information indicating a data signal failure into the overhead field. In the case that the second network node detects a failure by the tandem connection monitory sink function, the second network node enters information indicating a tandem connection failure into the overhead field. A third network node is located after the path segment at the transmission path. In the case that the third network node detects a failure of the data signal, which occurs along the transmission path, the third network node uses the information that is contained in the overhead field for determining whether the detected failure occurred within the path segment or whether the failure occurred outside of the path segment.
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