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Knowledge Base

Normal Boards Are Mistakenly Considered as Being Faulty due to Optical Module Characteristics

Publication Date:  2012-07-25  |   Views:  161  |   Downloads:  0  |   Author:  SU1000776787  |   Document ID:  EKB0000375662

Contents

Issue Description

In a new OSN 6800 project, the TN1M1LOG01 board is tested on site. The test results show that the optical input power of certain client-side ports of the LOG board is about �12.5 dBm (the receiver sensitivity of the client-side ports is �17 dBm) and these ports keep reporting the R_LOS alarm (the alarm lasts for a period ranging from several seconds to ten minutes). Query the performance events by running corresponding command lines. The optical power of the faulty ports is found unstable, changing alternately between�12.5 dBm and �60 dBm. 

Alarm Information

R_LOS 

Handling Process

No handling is required. This problem does not occur when normal signals are accessed on the client side but occurs only when the accessed signals on the client side are not modulated. 

Root Cause

Apply a physical loopback for the 6F44 optical module on the client side and ensure the optical input power is within the allowable range of the optical module. When the optical input power is relatively high, no R_LOS alarm is reported. When the optical input power is relatively low, the R_LOS alarm is reported. When the optical input power is within an intermediate range, the R_LOS alarm is reported and then cleared alternately.
Triggering condition:
The accessed signals on the client side are not modulated.
Alarm handling:
Not required.
Module type:
SCP6F44-GL-BWE
Vendor:
Sumitomo Electric
BOM code: 00290458 
 

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