Symptom
The physical optical cable at an office is interrupted, but the logical fibers connected to the FIU board do not change to red on the NMS.
Cause analysis
After the optical cable is interrupted, the NMS changes the logical fibers connected to an FIU board to red if the FIU board reports a MUT_LOS alarm.
Both the TN11FIU and TN12FIU boards can detect optical power and report a MUT_LOS alarm if they receive no light. However, the TN13FIU board cannot detect optical power. The NMS changes the logical fibers connected to a TN13FIU board to red if it detects that an OTS_LOS alarm is reported.
Procedure
- Query the manufacturer information about the FIU board. The malfunctioning board is a TN13FIU board that cannot detect optical power.
- Query the NE software version. The NE software version is OptiX OSN 6800 V100R004C04SPC800 (5.51.05.35), for which the OTS_LOS alarm is supported.
- Query the NMS version. The NMS version is iManager U2000 V001R001SPC003, which changes logical fibers connected to a TN13FIU board to red in case of an OTS_LOS alarm.
- Verify the logical fiber connections on the NMS. The logical fibers between the FIU board and SC2 board are incorrectly connected. The problem is resolved after the fiber connections are modified.
Reference Information
In case of a fiber cut, the NMS changes the logical fiber connections to red based on the alarm that is reported on the board or NE.
The following table lists the color changes for the logical fiber connections for various FIU boards.
| Board Type | NE Software Version | Mapping NMS Version | Description |
|---|---|---|---|
| TN11FIU | Irrelevant to the NE software version | Mapping NMS version | The FIU board can detect optical power and report a MUT_LOS alarm if it is receiving no light. The NMS changes the logical fibers connected to the FIU board to red when it detects the MUT_LOS alarm. |
| TN12FIU | Mapping NMS version | ||
| TN13FIU | OptiX OSN 6800 V100R004C04SPC800 (5.51.05.35)/OptiX OSN 8800 V100R002C02SPC800 (5.51.05.35) or later | iManager U2000 V001R001SPC003/iManager T2000 V002R008SPC005 or later |
The FIU board cannot detect optical power and cannot report a MUT_LOS alarm. The NE software reports an OTS_LOS alarm after it detects that the OSC and OA boards connected to the FIU board report an R_LOS alarm and a MUT_LOS alarm respectively. The NMS changes the logical fibers connected to the FIU board to red when it detects the OTS_LOS alarm. NOTE:
The NE software can report an OTS_LOS alarm only when the logical fibers are correctly connected. |
