The shortcomings of traditional OTDR meters in measuring optical fibers are: (Multiple choice)

• A.Business will be interrupted during measurement
• B.Need inbound measurement
• C.Cannot be used for routine maintenance testing
• D.Manual interpretation is required, which requires high operator requirements

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Which of the following description of 1+1 optical line protection is wrong?

• A.The switching method defaults to non-recovery
• B.The active and standby input light difference defaults to 5dB.
• C.The primary and secondary input lights initial difference defaults to 0.
• D.The switching mode defaults to double-ended switching

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Daily equipment maintenance items, excluding:

• A.Check the fan box and clean the air filter
• B.Check the cabinet and board indicators
• C.Check the room temperature, humidity and cleanliness
• D.Check device sound alarms

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Which of the following description of ODUk ring protection is wrong?

• A.The agreement must be completed after the protection configuration of each site on the ring network is completed.
• B.ODUk ring network protection is mainly applied to the ring network configuration of distributed services. It protects multiple distributed services between all sites by occupying two different ODUk channels.
• C.Ordinary ODUk ring network protection does not require setting a management node.
• D.Enhanced ODUk ring network protection, no need to set up management nodes. If the management node is set, there is no impact on protection.

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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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