Which of the following reasons will not cause abnormal optical power?

The performance indicators of the OTN circuit board focus on the input optical power and bit error rate. Abnormal optical power may cause bit errors. If the input optical power is too high, you can add optical attenuation to the IN port.

In a WDM network, if both the bidirectional OA and OSC report an optical loss alarm, which is the most likely reason?

Which of the following is the overhead for bit error detection in the OTN frame structure?

When configuring 1+1 optical line protection, you can choose RI1/T01 or RI2/T02 as the working channel according to the actual situation.