A R_LOS is found on the LQM. The services, however, are observed as normal. Check the optical power.
In the practical applications and tests, when the RLOS alarm occurs, the RLOS alarm must be handled immediately even if the service is not affected in the short term.
The specification of the client-side SFP module is set according to the international standard and the module performance, with certain redundancy. Therefore, the R_LOS threshold is slightly smaller than the performance threshold. In addition, the module performance varies with the suppliers, and the R_LOS alarm threshold varies with the modules.