Hello everyone!
Today, I’d like to share a case.
Problem Description
When troubleshooting a WDM issue that a high order alarm ocours on the fiber the OCh and the corresponding OTN levels
(OTU, ODUk and Client) should alarm too, showing that there is an alarm on the path, but this is not happening
Checking the picture above you can see that the fiber is alarmed
Now lets see the trail alarms,
As you can see, the OCh is alarmed but the related OTU2, ODU2 and Client show no alarms.
When a high order alarm is generated on a fiber like MUT_LOS or OTUk_LOF the corresondenting OTU,
ODU and Client of the OCh should be alarmed too.
MUT_LOS - This alarm indicates a loss of multiplexed signals. This alarm is generated
when the input multiplexed signals of the board are lost.
OTUk_LOF - The OTUk_LOF is an alarm indicating that the frame alignment signal (FAS) is abnormal.
This alarm occurs when the frame alignment processing is out of frame (OOF) in three consecutive milliseconds.
Problem Analysis
When analysing the problem it was check that the related OTN level were not alarming properly on the U2000 NMS.
Root Cause
Solution Description
After Checking the issue with R&D it was asked to check the value of a field bDisplayServerTrailAlarm
on the File Nml_otn on server configurations.
The parameters follow the rules
bDisplayServerTrailAlarm 0 - No alarm will be displayed on the related OTN Trails.
bDisplayServerTrailAlarm 1 - Alarm will be displayed on the related OTN Trails.
To check the value perform the following:
1 - On the Client instalation path open "... \U2000\client\tools\usercfgtool"
2 - Open the File " usercfgtool.bat"
3 - You will face a similar screen
Ps:By default the password of user " sa" is " Changeme_123"
4 - Look for the field bDisplayServerTrailAlarm and check if the values correspond to the actual desired parameters.
As you can see above the parameter of bDisplayServerTrailAlarm is 0 so we need to chenge it to 1 to enable the alarms to be
shown on U2000, after change its necessary to restart the process Nml_otn by System Monitor.
