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.Ordinary ODUk ring network protection does not require setting a management node.
• C.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.
• 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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The main application scenarios for board compatible replacement are (). (Multiple Choice)

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

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When the board detects that the error rate of the regenerator section signal exceeds 10 by detecting the B1 byte, the B1_SD alarm is reported.

• A.FALSE
• B.TRUE

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For the relay type OTU, the alarms of all SM segments are terminated at the local station and are not transmitted downstream (except for OTUkLOF to insert ODUk_PI_AIS downstream). Other alarms continue to be transmitted to the downstream station and reported on the WDM side of the OTU (except for R_LOS to insert ODUK_PM_AIS to the downstream site).

• A.FALSE
• B.TRUE

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When configuring 1+1 optical line protection, you can select RI1/TI2/TO2 as the working channel according to the actual situation.

• A.TRUE
• B.FALSE

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