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ALS Function of the OptiX OSN 6800 Invalid Caused by Residual Optical Power

Publication Date:  2012-07-25 Views:  49 Downloads:  0
Issue Description
In country G, client A uses the OptiX OSN 6800 V100R003C02B01e. When the ALS function of the LSXL is tested, the client side of the LSXL at station A is connected to the meter, and the optical loopback is performed on the client side of the LSXL of station B. In this case, when you enable the ALS function of the boards at the two ends, the services are normal. If the fiber looped back at station B is disconnected, the meter connected to station A receives the R_LOS alarm. Connect the meter to the client side of station B, and perform the loopback on the client side of station A. Disconnect the fiber looped back at station A, and thus the meter connected to station B receives the R_LOF alarm and frequency deviation information. No R_LOS alarm is reported, and the laser is shut down. The ALS function is invalid. 
Alarm Information
R_LOF 
Handling Process
The ALS configurations on the board at the two ends are inconsistent. The board has no abnormal alarm and performance event, and the services are normal. If this problem recurs, if you use the optical power meter to test the optical power of the WDM side connected to the meter, the input power is �17 dB. After you consult the experts, it is determined that the optical power is caused by factors such as noise, which belongs to residual optical power. According to the current product specifications, it is determined that optical power is input, and thus the laser at the transmit end is not shut down. Replace the 5 dB fixed attenuator at the local end to a 7 dB fixed attenuator. In this case, the test is successful. 
Root Cause
The ALS functions of the boards at the two ends are different. The possible causes may be as follows:
1. The ALS configurations at the boards of the two ends are faulty.
2. The boards are faulty.
3. It is the implementation specification of the ALS of the product. 
 
Suggestions
During the test and deployment of the WDM product, you should pay attention to the residual optical power caused by factors such as noise. 

END