Reason why an OTU board still reports the R_LOS alarm when receiving optical signals normally

The possible cause is that alarm inversion is manually enabled.
During network deployment, some alarms may be reported but are meaningless. For example, a LOS alarm is reported even though no cable is connected to a board on which a service has been provisioned. After alarm inversion is enabled, such an alarm can be not reported to prevent disturbance on maintenance engineers. Alarm inversion needs to be disabled after commissioning is complete.

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