Which of the following are performance related to SM segment errors

• A.OTUk_BBE
• B.OTUk_SM_FEES
• C.OTUk_SM_FEBBE
• D.OTUk_PM_BBE

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PTN equipment realizes the unified bearing of multiple services through PWE3. For users, the PTN equipment is equivalent to a Layer 2 switch at this time.

• A.TRUE
• B.FALSE

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Which of the following descriptions are correct for error alarms (multiple choice)

• A.OTUk_ES (OTUk_BEE ), ODUk_PM_ES (ODUk PM_BBE) are OTUk/ODUk errored seconds (background error block), the count is the error count of the OTUk/ODUk signal that is counted, non-zero means OTUk/ODUk signal The second in which a bit error occurred (the number of errored blocks).
• B.OTUk_SES and ODUk_PM_SES are OTUk/ODUk severely errored seconds, and the count is not zero, indicating that the OTUk/ODUk signal has generated a large bit error in seconds (1 second counting error bits more than 15% of the maximum transmission byte)
• C.FEC_BEF_COR_ER enables the FEC function to be effective, FEC error rate before error correction, indicating the error statistics of the received OTUk signal (including OTUk overhead), and the error rate before error is not zero, indicating the error rate introduced by the transport layer The bit error may have affected the OTUk signal.
• D.FEC_AFT_COR_ER enables the FEC function to be valid. The error rate after FEC error correction indicates the error statistics of the OTUk signal (including OTUk overhead) after FEC encoding and error correction. The error after correction is not zero, which means transmission The bit error introduced by the layer may have affected the OTUk signal.

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The security management of network management mainly includes object management, password management, access control management and decentralized domain management, etc. The security management of network elements includes network element access control, network element user management, and network element operation authority management.

• A.TRUE
• B.FALSE

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Which of the following statements about the ALC function and configuration principles of the OTN system is correct? () (multiple choice)

• A.The ALC function can automatically adjust the output optical power of the amplifier in which the line attenuation changes. Except for the first site, other sites must be equipped with power detection units
• B.If there are two cascaded OA boards in the node, the first node only configures the second OA board as the reference unit, and do not deploy the power detection unit
• C.The detection and reference unit of the first node cannot use the same optical port of the same board
• D.The "working mode" of the OA board and RAU1/RAU2 board must be configured as "gain lock", if it is configured in other modes and ALC is configured, the ALC will not be adjusted
• E.It is recommended that the number of network elements in the ALC link is less than 20, otherwise the ALC adjustment may time out and cause failure
• F.Each ALC link has a unique ID, and ALC nodes can belong to different DCN subnets

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