Procedure

1. Cause 1: Line failure between WDM equipment and SDH equipment. The customer side of the docking veneer of the WDM equipment may report R_LOS and R_LOF alarms.
   1. Detect whether the type of the docking single-board optical module is the same and whether the distance to the customer side matches. Single-mode and multimode optical modules cannot be mixed.
   2. Check whether the single-board fibers at both ends match. Single-mode and multimode fibers cannot be mixed.

      
      

      Description:

      Multimode fibers are generally orange; single-mode fibers are generally yellow.

      
      

   3. Follow the fiber label to check if the fiber is plugged in incorrectly. If the fiber is incorrectly connected, it is possible that the device will not generate an R_LOS alarm, but will generate a large number of abnormal performance events, which will require the fiber to be reconnected correctly.
   4. Use an optical power meter to check the device's docking pigtail; if abnormal, replace the pigtail. If the pigtail is normal, check the fiber optic cable for faults.
2. Cause 2: The parameters on the customer side of the WDM product's docking single-board interface are incorrectly configured. The customer side of the WDM equipment's docking single-board interface may report an R_OOF alarm.
   1. The service types do not match.

      
      

      • When the WDM equipment is docked to a single board, query and set the service type accessed by the customer side of the single board to ensure that it is consistent with the SDH service type equipment.

      
      

   2. The docking port has a loopback.

      
      

      • Log in to the U2000 network manager, open the "Network Element Manager" interface, select the docking network element, and select the docking single board.
      • Select "Configuration > WDM Interface" in the "Function Tree" on the left.
      • Select "Basic Properties", click "Query", and check whether there is loopback on the customer side of the single board. If there is, double-click the "Loopback" parameter field, select "No Loopback" in the drop-down bar, and click "Apply".

      
      

3. Cause 3: Docking board failure.
   1. WDM equipment docking single board customer side optical port, use optical power meter to test the optical power; if abnormal, replace the single board.
   2. SDH equipment docking single board optical port, use optical power meter to test the optical power; if abnormal, replace the single board.