Which of the following reasons does not cause optical power anomalies?

• A.The pigtail is too large
• B.Equipment temperature is too high
• C.Pigtail connection error
• D.Enable FEC function

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The maximum optical power of light-emitting OBU output is 20dBm, which is used in the C-band 80 system. How much dBm should the single-wave standard output optical power be?

• A.+7dBm
• B.+1dBm
• C.+4dBm
• D.-2dBm

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Since the CWDM system does not use an optical amplifier, the focus of the commissioning is whether the light collection of the OTU board is reasonable.

• A.FALSE
• B.TRUE

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The NS4 board features test includes: (Multiple choice)

• A.Side mode suppression ratio
• B.Center wavelength test
• C.Receive sensitivity
• D.-20dB spectral width test

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The following description of the PM_BIP8 related alarm, which is correct?

• A.The PM_BIP8_OVER alarm indicates the PM segment error amount of the ODU layer is over-limit alarm.
• B.The PM_BIP8_SD alarm indicates the PM segment signal degradation alarm in the ODU layer.
• C.The PM_BIP8_DEG alarm indicates the PM segment signal degradation alarm in the ODU layer.

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