Description of the problem

In the Huawei OSN3500 equipment opening often encountered part of the optical board of the optical module due to the collection of optical power is too high leading to the optical module is burned, due to the lack of basic fault judgment of the first line, will be such a single board as a single board with unknown cause of failure in accordance with the to-be-analyzed pieces of the return of the company to request an analysis, which is a waste of the company's resources, and due to the cause of the problem is not known in the absence of a timely correction of first-line engineers. R_LOS or IN_PWR_HIGH alarm.

The Solution

For the faulty single board whose optical module is burned due to too high received optical power, the actual received optical power is permanently recorded at the moment when the optical module is burned. Therefore, when the optical module failure is suspected, you can query the received optical power of the single board without connecting the optical fiber, and if the queried received optical power of the single board is still high, it means that the optical module is burned by the high power.

For example, there is a SS62S1602-L16.1 single board, suspected of optical module failure, in the case of no fiber connection, single board reported R_LOS, query the single board of the received optical power, found that the received optical power is always -5dBm, indicating that the optical module is burned by the -5dBm of strong light.

Suggestion and Summary

(1) It is necessary to standardize the operation specification of the first-line engineers. For the long-distance optical board, the optical module is usually an APD tube, and the overload point is -9dBm, so the engineers need to pay attention to the value of the received optical power, so as to prevent the optical module from being burned;

(2) for faulty single board, you need to query the method of receiving optical power to determine whether it belongs to the optical module is burned, if it belongs to such a situation is the cause of the failure of the single board has been clear, direct repair can be, do not need to fill in the analysis to be analyzed for the analysis of the appointment.