Before the deployment of a batch of NE40E-X3 routers in a major project, the customer requires an optical attenuation test on the OPM board on the NE40E-X3 routers. During the test, it is found that the optical attenuation of the optical interface P4 exceeds the threshold sometimes.
Clean the dust on the optical interface where the optical attenuation test is abnormal.
1. During the optical attenuation test, the OPM board is not inserted into a service board. Therefore, the problem is not caused by the running of the router.
2. Test other optical interfaces using the optical attenuation test instrument. It indicates that the optical attenuation is within the normal range, which indicates that the problem is not caused by a fault on the device.
3. Clean the dust on the optical interface P4 where the optical attenuation test is abnormal and then perform the test again. It turns out that the optical attenuation recovers.
Keep interfaces of the device clean.