The TF alarm on the OTU at the upstream station results in the OTU_LOF alarm on the OTU
at the downstream station.
Product
OptiX BWS 1600G
Fault Type
TF
OTU_LOF
R_LOS
Service Interruption
Optical Transponder Unit
Symptom
In a network consisting of the OptiX BWS 1600G systems, the signal flow at stations is as follows:
A→B→C→D. A, C, and D are OTM stations and B is an OLA station. The LWFS board is
configured at stations A and D. The TMRS board is configured at station C.
An LWFS board at station A reports the TF alarm and the transmit optical power on the WDM
side decreases by 10 dB approximately. The corresponding TMRS board at station C reports the OTU_LOF alarm on the WDM side. The transmit optical power of the TMRS is -60 dBm.
The corresponding LWFS at station D reports the R_LOS alarm.
Cause Analysis
The LWFS board at station A reports a TF alarm and the transmit optical power deteriorates,
indicating that the transmit optical power of the LWFS board is abnormal. Accordingly, at station C,
the receive optical power of the TMRS board using the same wavelength as the LWFS board at
station A becomes abnormal. As a result, the receive optical power of the LWFS board at station D
where the wavelength is dropped is abnormal.
The preceding analysis shows that the LWFS board at station A is malfunctioning.
Procedure
Replace the LWFS board at station A. The alarms at stations C and D are cleared and therefore the
fault is removed.
Reference Information
None.
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