Whether system control boards need to be involved to implement intra-board 1+1 protection on OLP boards

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Yes, the system control boards need to be involved.

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

OLP/DCP board alarms that can trigger intra-board 1+1 protection switching
OLP or DCP boards support the function of dual feeding and selective receiving. They can work with OTU or line boards that do not support this function to configure intra-board 1+1 protection. An R_LOS or POWER_DIFF_OVER alarm reported by an OLP or DCP board can trigger intra-board 1+1 protection switching.

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.

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.

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