The main application scenarios for board compatible replacement are (). (Multiple Choice)

• A.Replacement board
• B.Expanding the board
• C.Change the board ID
• D.Change the board IP

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Which of the following description of the single station commissioning is wrong?

• A.It is strictly forbidden to plug and unplug the power plug and PIU board.
• B.In case of power failure, the contact board can be used without anti-static wrist or anti-static gloves.
• C.If the input voltage of the equipment is not within the required range, suggestions for rectification should be proposed.
• D.Single station hardware check is complete, make sure all power switches are in the off position

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Which of the following description of the evolutionist in the mainstream SDN model in the industry is correct? (Multiple Choice)

• A.Try to preserve and reuse existing routing protocols and IP network technologies
• B.Device programmable, open northbound API interface
• C.Make full use of existing equipment and achieve fast
• D.Control flexibility is moderate and open is not complete

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Which of the following tools may Board replacement use? (Multiple choice)

• A.U2000
• B.Shielding bag
• C.Fiber extractor
• D.Anti-static gloves

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The wave division system complement to chromatic dispersion mainly adopts the DCM compensation method. The following statements about DCM dispersion compensation, which is wrong?

• A.Improper configuration of the DCM will result in degradation of the system signal-to-noise ratio.
• B.10G system with line fiber length less than 400km, G.652 DCI can be used to compensate G.655LEAF).
• C.Improper configuration of the DCM will result in degradation of the receiving end performance.
• D.The DCM module is more likely to cause nonlinearity than the line transmission fiber, so it is necessary to strictly control its fiber-optic power.

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