Normal Boards Are Mistakenly Considered Faulty due to Optical Module Characteristics

Normal boards are mistakenly considered faulty due to optical module characteristics.

Product

OptiX OSN 6800, OSN8800

Fault Type

Others

Symptom

The TN1M1LOG01 board in the OptiX OSN 6800 on a network is tested on site. The input optical power at certain client-side interfaces on the board is about -12.5 dBm (the client-side receiver sensitivity is -17 dBm) or sometimes -60 dBm. In addition, the board keeps reporting the R_LOS alarm for seconds to ten minutes at these faulty client-side interfaces.

Cause Analysis

The SCP6F44-GL-BWE optical module is used on the client side of the TN1M1LOG01 board.

A fiber is used to self-loop the receive and transmit optical interfaces on this optical module and limit the input optical power of the module to a value that does not exceed the threshold. When the input optical power is high, the board does not report the R_LOS alarm. When the input optical power is low, the board keeps reporting R_LOS alarms. When the input optical power is within the normal range, R_LOS alarms are reported intermittently.

Procedure

1. Ignore this problem. It does have any negative effect. The R_LOS alarm is not reported when normal signals are input to the client-side module on the TN1M1LOG01 board with the SCP6F44-GL-BWE optical module. The R_LOS alarm is reported only when unmodulated signals are input to the client-side module on the board.

Result

The problem is solved.

Reference Information

None.

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