After the OSN580 is powered on at a site, the receive and transmit optical power cannot be queried on the NMS after the optical port is looped back.
1，configuration to start 15min and 24 hours performance monitor.
2,enable the optical port,get R-los alarm,but it's clear after a few second,still can't get receive and transmit optical power.
3,check the path cord and attenuator change new one.
4,disable optical laser auto shutdown.
5,Querying the Manufacture Information of a Laser confirm the laser was multi-mode.
6,confirm the patch cord module was single-mode.
7,change the patch cord to multi-mode.
the optical single and patch cord mismatch.
confirm the optical module model then select patch cord based on the optical module model.
During the construction or maintenance of the live network, pay attention to the use of the optical module and select the correct patch cord according to the optical signal.