Dealing with the issue when the OAU board has input optical power but does not emit light

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The possible cause is that the laser on the OAU board is not turned on. You are advised to check the laser status.

Other related questions:
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.

Reason why the RO port of the TN12OLP board does not output optical signals when the RI1 port has input optical signals, but outputs optical signals when the RI2 port has input optical signals
When no port configuration is configured on the TN12LOP board, the board receives optical signals through its RI2 port by default.

Whether the TOM board on the OSN 6800 supports 1.25G optical modules and whether the client-side laser on the local board emits light if no light is received on the client side of the peer board
The client side of a TOM board supports optical modules with rates ranging from 100 Mbit/s to 2.5 Gbit/s. When ALS is enabled for the client-side laser on the local TOM board, the client-side laser on the local board will not emit light if no light is received on the client side of the peer board. When ALS is disabled for the client-side laser on the local TOM board, the status of the client-side laser on the local board is not adversely affected by the client-side light receiving status of the peer board.

Input optical power range of the OLP board
TN11OLP01: �?5 dBm to +7 dBm (single-mode) TN11OLP02: �?5 dBm to 0 dBm (multi-mode) TN12OLP01: �?5 dBm to +7 dBm (single-mode) TN12OLP03: �?0 dBm to +23 dBm (single-mode) TN12OLP04: �?2 dBm to +23 dBm (single-mode)

Light emitting of the LINE1 port of the SFIU board on OSN 9600
The LINE1 port is the public channel for service light and monitoring light. The reverse light of the monitoring light also traverses this port. Therefore, the LINE 1 port emits light at the receive end.

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