OSN3500 Fiber Optic Transmission Equipment SLQ1A Optical Interface Board Realizes the reception and transmission of 4-channel STM-1 optical signals, completes the photoelectric conversion of STM-1 signals, the extraction and insertion processing of overhead bytes, and reports the alarms generated on the line. Support optical module information detection and query. The optical interface provides laser open and close settings and laser automatic shutdown function. Supports the use and monitoring of SFP pluggable optical modules, which facilitates the maintenance and upgrading of optical modules. Supports segment overhead processing of STM-1 signals. Supports the processing of channel overhead (transparent transmission and termination). Supports setting and querying of J0/J1/C2 bytes. Supports 1 to 4-way ECC communication. Supports inner loopback and outer loopback functions at the optical port level. Supports VC-4 channel inner loopback and outer loopback functions. Support soft reset and hard reset, soft reset does not affect the service. Support the query function of single board manufacturing information. Support FPGA online loading function. Support smooth upgrade of veneer software.

Problem Description

On a certain day, a bureau inquired about the optical power of the SLQ1A single board of the OSN3500 equipment and found that the value of the optical power received by all optical ports was displayed as 1837dBm, while the optical power received by the optical power measurement was about -18dBm. The single board model is: SSN1SLQ1-B2 single board, software version 7.54.

Processing

1, replace the normal laser still can not solve the problem, exclude the laser parameter table error.

2, after obtaining data to confirm that the laser parameter table is correct, the root cause of this problem is the SSN1SLQ1-B2 single board software read IC2 register error, resulting in "translation" over the laser value error, this failure does not affect the normal work of the single board, if you want to completely solve this problem need to upgrade the single board software to version 7.61 or above in order to solve the problem. If you want to solve this problem completely, you need to upgrade the single board software to version 7.61 or above to solve it.

Root cause

1, laser failure, read laser parameter table error caused.

2、Single board software read laser value error.

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