Monitoring sections of PM and TCM overheads in OTN overheads

The SM, PM, and TCM overheads are generated at the source node and terminated at the sink node. The corresponding boards at the source and sink nodes monitor the signals and report the performance of the signals.
The SM overheads need to be terminated and then regenerated at all the nodes that have the 3R functions. That is, all the boards that support the OTN interface must process the SM overheads.
The PM overheads are terminated at the sink node of a channel.
The TCM overheads can be terminated at a selective sink node based on the actual situation. The TCM overheads have six levels and three allocation modes (cascaded, nested, or overlapped), which can be determined flexibly as required.

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