The board types that need to be upgraded when NG-SDH equipment is upgraded are: 1. Cross-connect board 2. Main control board 3. Service board. What is the correct upgrade sequence?

• A.321
• B.213
• C.312
• D.123

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The non-linear effect of the coherent signal is stronger than that of the 10G non-coherent, so the single-wave entering fiber optical power should be reduced. Therefore, during system commissioning, the OA gain can be reduced to reduce the single-wave output optical power of the OA to meet the fiber-in optical power requirements.

• A.TRUE
• B.FALSE

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What may be the reason why the RAU Raman board cannot gain normally? (multiple choice)

• A.Raman board failure
• B.Raman pump is not turned on
• C.The current value of the input optical power is -40dbm
• D.The return loss is too large

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After a maintenance person failed to start the CORBA interface, he listed several inspection steps.
1. View the log file "%IMAPROOT%/server\var\logs\Develop\nbi\Agent_CORBA\unbi_sys_yyyyMMdd_hhmmss_*.log";
2. Check whether the U2000 License file supports the U2000 CORBA interface function;
3. Check if the %IMAPROOT%/server/ns.ior file is deleted. Is his operation correct?

• A.FALSE
• B.TRUE

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According to the requirements, before OTN 6800/8800 equipment is upgraded, it is necessary to return the network element health check file to TAC analysis

• A.TRUE
• B.FALSE

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