Causes for the issue that OSN 6800 SFIU board does not support optical power detection but has an input optical power loss threshold

1. Unlike a common FIU board that reports a combined alarm MUT_LOS depending on alarms concurrently reported by OA and SC2 boards, an SFIU board carries single-fiber bidirectional OSC signals. Because an MUT_LOS alarm occurs at the OA in the receive direction, and the IN port of the OA and the SYS1/SYS2 port of the SFIU board are connected through a logical optical fiber, the NE reports an MUT_LOS alarm that is combined with alarms reported by the LINE1/LINE2 port on the SFIU board.
2. The input optical power loss threshold for the WDM port on the SFIU board can only be queried but cannot be set. This counter is reported from the system control board through a query of the OA counter. That is, the input optical power loss threshold for the SFIU board is the input optical power loss threshold for the OA board in the receive direction of the logical optical fiber.

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