Whether higher-order bit errors can be detected when VC-4 does not carry services

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Whether higher-order bit errors can be detected when VC-4 does not carry services:
Higher-order bit errors cannot be detected when VC-4 does not carry services. They can be detected when VC-4 carries services.

Other related questions:
Service bit errors
Question: What may cause service bit errors? Analysis: None Root cause: None Answer: 1. Unreasonable dispersion compensation (not enough or too much); 2. Too high or too low incident optical power; 3. Performance deterioration of the transmit laser on the OTU board at the transmit end; 4. Severely contaminated pigtail connectors; 5. Changes in fiber attenuation; 6. Performance deterioration of the receive laser on the OTU board at the receive end. Suggestion and conclusion: None

Period for bit error detection in Poisson mode
According to the OTN standards, the period of the Poisson mode does not need to be set separately. It is related to the configured BER threshold. The difference is 10 times between two adjacent orders of magnitude. For example, 1E-3 corresponds to 10 ms, while 1E-4 corresponds to 100 ms.

Bit error detection mechanism of a 2M tributary board
Bit error detection mechanism of a 2M tributary board: A 2M tributary board performs bit error detection for signals transmitting from a cross-connect board to the 2M tributary board, and does not perform bit error detection for 2 Mbit/s signals received from the PDH physical port on the 2M tributary board.

Relationship of SDH VC-4, VC-3, and VC-12
Relationship of SDH VC-4, VC-3, and VC-12: One VC-4 contains three VC-3s and 63 VC-12s.

Payload capacity of VC-4
Payload capacity of VC-4: The payload capacity of VC-4 is 140 Mbit/s.

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