When testing the overload point and sensitivity of the IN port of the OTU board, which of the following is unnecessary?

• A.Optical power meter
• B.Attenuator
• C.OTDR measuring instrument
• D.SDH Analyzer

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The lower the noise figure creep value of the amplifier, the less noise the amplifier introduces.

• A.False
• B.True

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Which of the following descriptions about equipment heat dissipation is correct? (Multiple choice)

• A.Daily check whether the board is hot and whether the air volume of the subrack vents is large
• B.Subrack temperature can be monitored on the network management
• C.There should be no debris in the cooling holes on the subrack, such as 2M cables, pigtails, etc.
• D.Clean the dust filter of the fan box regularly

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Which of the following options is the low-loss area of single-mode fiber? (Multiple choice)

• A.1200nm
• B.1550nm
• C.900nm
• D.1310nm

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In the WDM system, if the receivable TTI is inconsistent with the actual received TTI, what alarm will be reported?

• A.OTUK_LOF
• B.OTUk_TIM
• C.OTUK_TTI
• D.OTUK_LOS

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