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

1

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.

Other related questions:
Whether services on the protection channel of an intra-board 1+1 protection group can be manually switched to the working channel
Sure. Intra-board 1+1 protection is generally unidirectional and non-revertive. Therefore, services need to be manually switched back to the working channel when the working channel is normal.

Whether the intra-board 1+1 protection on the DCP board supports the revertive mode
No, it does not.

Whether LEM24 supports intra-board 1+1 protection
When working with the DCP or OCP board, the LEM24 board supports extended intra-board 1+1 protection.

Whether LEX4 supports intra-board 1+1 protection
When working with the DCP or OCP board, the LEX4 board supports extended intra-board 1+1 protection.

Method used to specify the working and protection trails of an intra-board 1+1 protection group on OLP boards
Select ports 1(RI1/TO1) and 2(RI2/TO2) of the OLP boards as the working and protection trails respectively.

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