When the optical cable between the FIU and the FIU fails, the optical layer alarm reported by the downlink site is (). (Multiple Choice)

• A.OSC_LOS
• B.MUT_LOS
• C.R_LOS
• D.OSC_RDI

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

• A.Enhanced ODUk ring network protection, no need to set up management nodes. If the management node is set, there is no impact on protection.
• 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.The agreement must be completed after the protection configuration of each site on the ring network is completed.

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Which of the following is the data that needs to be collected and saved in the event of a failure? (Multiple Choice)

• A.Equipment alarms and performance events
• B.Running status data of the NE and the board
• C.Configuration data for network elements and boards
• D.Operation log of the network management

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When creating single station optical crossover, an error message "The direction of the cable is wrong selected" appears. The possible reason is?

• A.Lack of logic fiber between boards
• B."Create reverse crossover" is not selected during configuration
• C.Device physical fiber connection error
• D.The network element management time is not synchronized.

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Which of the following trails can be configured on the NMS.

• A.ODUk
• B.OCh
• C.OTS
• D.client

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