Procedures

1. Corresponding phenomenon 1: Failure of single board laser on/off operation.
   1. Reason 1: Version mismatch.
      1. Upgrade the single-board software to ensure that the single-board software and host software version match.
      2. Check whether the single-board laser on and off operation is back to normal, if the operation still fails, turn to other reasons.
2. Corresponding phenomenon 2: the optical power value of the light received is abnormal.
   1. Cause 1: Hardware failure.
      1. Check whether the optical fiber is malfunctioning.

         If ......	then ......
         If the optical fiber has failed	Replace the faulty fiber and check whether the optical power value of the light received is back to normal. If it returns to normal, troubleshooting is complete. If it does not return to normal, continue to the next step.
         If the optical fiber is not faulty	Continue to the next step.

      2. Check for faults in the pluggable optical module.

         If ......	then ......
         If the pluggable optical module has failed	Replace the faulty optical module and check whether the optical power value of the light received is back to normal. If it returns to normal, troubleshooting is complete. If it does not return to normal, continue to the next step.
         If the pluggable optical module is not faulty, replace the faulty optical module.	Continue to the next step.

      3. Check for faulty light attenuation.

         If ......	then ......
         If the light attenuation has failed	Replace the light attenuation and check if the optical power value of the light received is back to normal. If it returns to normal, troubleshooting is complete. If it does not return to normal, continue to the next step.
         If the light attenuation is not faulty, continue to the next step.	Continue to the next step.

      4. Check for veneer failure.

         If ......	then ......
         If the veneer is faulty	Hard reset or directly plug and unplug the faulty veneer to check whether the veneer is normally on, if not, select a spare board with exactly the same veneer parameters as the faulty veneer and replace the veneer. If it starts working normally, the troubleshooting is finished.
         If the veneer is not faulty	Turn to other reasons.

3. Corresponding Phenomenon 3: You cannot query the optical power information of the single board through the network management, nor can you query the parameter information of the optical module in the manufacturing information of the single board, and there are no related alarms and performance events reported.
   1. Cause 1: Optical module problems prevent the querying of performance.
      1. Replace the optical module and check whether the optical power information of the single board can be queried through the network management and whether the optical power value is within the normal range.

         If ......	then ......
         If you can query the optical power information of the single board through the network management, and the optical power value is within the normal range, the	Troubleshooting ends.
         If you still cannot query the optical power information of the single board through the network management, the	please contact Huawei engineers.

This chapter of related technical information and SDH equipment troubleshooting process by Shenzhen Optical Transmission Network Technology Co. Huawei SDH Optical Transmission Equipment,SDH Transmission Equipment Sales