Product

OptiX BWS 1600G

Fault Type

Service Interruption
OTU_LOF
R_LOS

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 ***ysis

• The TMRS board at station C is faulty.
• The LWFS board at station A is faulty.

Procedure

Step 1 Replace the TMRS at station C. The problem persists and the transmit optical power of the
TMRS remains -60 dBm.
Step 2 Replace the LWFS at station A. Then, the problem is solved.

Let me know if anyone has faced similar issue while maintaining the network.

Thanks a lot for writing a thread to the case.

I had seen this issue long time ago, and was rectified.

Good share, particularly for optical transport engineers

Your valuable comments shall highly be appreciated in this regard.

I dont know much about this? Need more detail

have you ever experienced OTU_LOF alarm on the OTU?

have you ever experienced OTU_LOF alarm on the OTU?

Thanks for sharing