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Knowledge Base

RLOS Alarm Persistent on SLQ4 board when connected to other vendor E-BSC due to TEM_HA alarm

Publication Date:  2012-07-25  |   Views:  197  |   Downloads:  0  |   Author:  Ebad Munawwar  |   Document ID:  EKB0000370699


Issue Description

In a certain network the 4 SLQ4-3 port has to be connected with other vendors E-BSC port 0x0. The connectivity is of STM-4 level. Upon establishing the physical connectivity the cutomer reports that Rlos Alarm remains on 4SLQ4 board. Upon visiting the site it is found that the ambient temperature is too high.

Alarm Information

R_LOS and  TEM_HA alarms on 4slq4

Handling Process

1- Checked the other ports of SLQ4 for physical connectivity and found them to be normal so the GSCC IS reporting the correct alarm and the problem lies within the SLQ4.
2- Checked the alarm supression and found that TEM_HA alarm was supressed a month before.
3- checked the tube core temperature performance (OSPITMPCUR)and found it to be beyond threshold.
4- Unsupressed the alarm and found that it was still being reported.
5- adjusted the room temperature but the TEM_HA alarm remained.
6- Replaced the SPF module of 4-SLQ4-3 port and the equipment now functions normally.

Root Cause

The laser of the board's SFP module had already been damaged due to the TEM_HA alarm which had occued a month before and now upon establishing the physical connectivity the SCC board reported R_LOS on the 4SLQ4-3 port.


In case of any temperature alarm related to the laser, A precaustionary measure should be taken no close the lasers which are un operational.