Delay measurement

Path delay refers to the time from the source to the sink, which is measured using overheads.
Delay measurement is used to measure the E2E bidirectional delay of ODUk signals. If ODUk SNCP protection is configured on the trail, the measurement result is the delay of the current working trail.
The measurement process automatically inserts PM-layer delay measurement overhead bytes to the OTU board at the source end. The intermediate NEs transparently transmit the overhead bytes and the sink end loops back the overhead bytes. After the measurement is complete, the related configurations are automatically restored.

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