Whether the corresponding fiber on the NMS turns red after a fiber cut occurs on WDM equipment

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If logical fiber connections are correct and a fiber cut occurs on WDM equipment, the corresponding fiber on the NMS will turn red.

Other related questions:
Reason why TN13FIU does not turn red on the NMS in case of a fiber cut
TN13FIU is a passive board and therefore cannot detect MUT_LOS signals. In case of a fiber cut, it does not turn red on the NMS.

Whether 100G WDM equipment can use the OTDR to detect fiber cuts
If the user has not logged in to the device, check whether the line OTDR breakpoint detection function is enabled for the 100G systems of the OSN 9600 and OSN 8800. The OSN 8800 is used as an example here. The OSN 8800 supports the fiber doctor (FD) since V100R009. This function requires the TN12ST2 and TN13FIU boards, and U2000 license, and MDS 6630. The U2000 license supports the control item of this function.

Whether the 100 G WDM equipment can use the OTDR to detect fiber cuts
The equipment supports the FD since V100R009. This function requires the TN12ST2 and TN13FIU boards, U2000 license, and MDS 6630.

Whether fibers of NG WDM NEs support automatic discovery
This function is unavailable on optical-layer boards.

Method used to determine whether optical fiber connections are correct between a router and a WDM board on the client-side of WDM equipment
Disable the ALS function for the client-side laser of the WDM board and enable the laser to forcibly emit light. If the optical port on the router receives optical signals, the optical fiber in the transmit direction is correctly connected. Stop the router from emitting light. If the WDM board reports an R_LOS alarm, the optical fiber in the receive direction is correctly connected.

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