ESC channel when intra-board 1+1 protection is configured using the OTU board (LDGD)

Question:
For an LDGD board, only the status of the DCC channel on the first optical port is displayed when the DCC status is queried using command lines or queried on the NMS.
Analysis:
Although an OTU board that supports intra-board 1+1 protection has two optical ports on the WDM side, ECC information of only one optical port can be converted into electrical signals identified by the SCC board. This is because signals from the optical layer to the electrical layer are actually selectively received due to the intra-board 1+1 protection. This optical port may be optical port 1 or 2. The cm-get-newbdinfo command determines optical port 1 for output and does not distinguish the optical ports. Therefore, sometimes when the optical fiber is removed from optical port 1, DCC on optical port 1 is still normal according to a query result using the cm-get-newbdinfo command.
Root cause:
None
Answer:
Before querying the DCC status on an LDGD board, query the status of the intra-board 1+1 protection group and confirm the current working channel.
The DCC status of optical port 1 as displayed on NMS or displayed using command lines, is the DCC status of the current working channel actually.
Suggestion and conclusion:
If no intra-board 1+1 protection is configured, services on optical port 2 cannot be selectively received, and the ESC channel on optical port also fails.

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