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Huawei Certified Network Professional-Building Carrier OTN Transmission Network Questions 76–80 (page: 17)

When commissioning an OTU board, which of the following is the optimal receiving range of the input optical power?

All NEs in an NG WDM subnet on the U2000 are removed. The U2000 network management reports NE_COMMU_BREAK, NE_NOT_LOGIN, and GNE_CONNECT_FAIL alarms, and the service is not affected.
According to this fault phenomenon, which of the following are possible causes ()? (multiple choice)

The extensive use of EDFAs in wavelength division systems is the most important cause of signal-to- noise ratio degradation.

The signal-to-noise ratio of the post-wave test on the D40 board with the spectrum analyzer will be larger than the signal-to-noise ratio of the IN port test.

What are the possible reasons why optical line protection cannot be automatically recovered? (multiple choice)