Drift refers to the long-term phase change of the digital signal relative to the standard signal less than 10 Hz, and jitter refers to the short-term phase change of the digital signal relative to the standard signal greater than 10 Hz.

• A.TRUE
• B.FALSE

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Which of the following statements about the configuration, testing and maintenance of IPA functions are correct? ()

• A.The purpose of testing the IPA function is to verify that if any fiber is broken in the fiber path included in the IPA, the amplifier included in the IPA can be turned off. After the fiber is restored, the amplifier can be automatically turned on, and The power change is within 0.5dB.
• B.IPA function is only applicable to Raman amplifiers, not to ordinary amplifiers
• C.Select "Configuration/IPA Management" in the function tree of the NE Manager to configure the IPA start delay value
• D.After the IPA function is successfully activated, when the amplifier board detects LOS, the optical power of its output port becomes safe optical power
• E.When the fiber interruption is repaired and the IPA cannot be terminated, it may be because the IPA protection group is not configured with the "detection board", only the auxiliary detection board is configured, and the auxiliary detection board reports an alarm that triggers IPA

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What is the incorrect reason for the OA_LOW_GAIN alarm?

• A.The board that reported this alarm is faulty
• B.The gain setting of the optical amplifier board is too low
• C.The insertion loss between the TDC and RDC optical ports is too large (only for OAU boards)
• D.The input optical power of the board is too high

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Which of the following statements about the configuration, testing and maintenance of IP functions are correct? () (multiple choice)

• A.IPA function is only applicable to Raman amplifiers, not to ordinary amplifiers
• B.When the fiber interruption is repaired and the IPA cannot be terminated, it may be because the IPA protection group is not configured with a "detection board", only the auxiliary detection board is configured, and the auxiliary detection board reports an alarm that triggers IPA
• C.After the IPA function is successfully activated, when the amplifier board detects LOS, the optical power of its output port becomes safe optical power. Select "Configuration/IPA Management" in the function tree of the network element manager, and you can configure IPA to start Delay value
• D.The purpose of testing the IPA function is to verify that if any fiber is broken in the fiber path included in the IPA, the amplifier included in the IPA can be turned off. After the fiber is restored, the amplifier can be turned on automatically, and Power change within 0.5dB

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The OAU105 single board of the OTN system has a maximum output power of 23dBm, and the maximum output power of a single wavelength in the 40-wavelength system can be calculated to be 4dBm

• A.FALSE
• B.TRUE

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