Bytes in a frame structure used for the DCC channel in the optical regeneration section and bytes used for the DCC channel in the optical multiplexing section

Question:
What are the bytes in a frame structure used for the DCC channel in the optical regeneration section? What are the bytes used for the DCC channel in the optical multiplexing section (OMS) to transmit network management information of a WDM system?
Answer:
According to SDH principles, bytes D1-D3 are used for the regeneration section, and bytes D4-D12 are used for the OMS section. In actual product application, however, bytes D1-D3 are used for DCC communication but bytes D4-D12 are not used.

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