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The NS2 Board on the OptiX OSN 6800 Fails to Report an RLOS Alarm due to Alarm Suppression

Publication Date:  2012-07-25 Views:  108 Downloads:  0
Issue Description
When an optical fiber at a certain office is broken, the OAU and D40 boards on the OptiX OSN 6800 report a MUT-LOS alarm, but the NS2 board at the receiving end fails to report an RLOS alarm. The performance query result indicates that the input optical power is -60 dBm and the product version is
Alarm Information
Handling Process

1. Query the alarm settings. The query result indicates that neither alarm suppression nor alarm reversion is enabled. After alarm initialization, the NS2 board still fails to report the RLOS alarm.

2. Run the optp:bid,0,2,6,2,11,0,0 command to check whether an RLOS alarm is generated on a board.

3. Suspect that the RLOS alarms on the above mentioned OTU boards are suppressed by a MUT-LOS alarm on the D40 board at the receiving end. Delete the logical optical fiber from the IN port on the NS2 board, and it is found that the RLOS alarm is reported. Then, create a logical optical fiber connecting to this port, and it is found that the RLOS alarm disappears.

4. It is confirmed that this alarm suppression mechanism is applied to the OptiX OSN 6800 of a version earlier than V1R4C04SPC510 and the OptiX OSN 6800 of version R4C01 or later versions.
Root Cause
The D40 board reports a MUT-LOS alarm, which suppresses the RLOS alarms on all the OTUs connected to the D40 board.