Which of the following statement is correct?

• A.The optical layer path and the electrical layer path are independent. It is not necessary to delete the electrical layer path when deleting the optical layer path.
• B.When the OCh path exists, you can directly create a client path. The NMS automatically creates an ODUk path.
• C.Deactivation will delete the configuration of the U2000, which has no impact on the device side services.
• D.The optical layer path must be deleted first when the electrical layer path is removed.

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Which of the following description of the principle of automatic protection switching of the standard SSM protocol is correct? (Multiple Choice)

• A.According to the clock source priority table, the network element first selects the clock with the highest quality level from the available clock sources as the synchronization source.
• B.The network element broadcasts the clock quality information of the synchronization source to the downlink site through the s1 byte. And reverse notice the uplink site by the S1 byte in the direction of the synchronization source that the clock quality from the local network element is "not available for synchronization".
• C.The network element broadcasts the clock quality information and the clock source ID of the synchronization source to the downlink site through the S1 byte, and reverse notices the uplink site that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.
• D.If there are multiple clock sources with the highest quality level, the network element selects the clock with the highest clock priority as the synchronization source.

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Before querying bit errors and optical power on the U2000, you need to perform the ( ) operation. Otherwise, the corresponding data cannot be queried.

• A.Synchronizing NE data
• B.Configuring data
• C.Enabling the NE Performance Monitoring Time
• D.Creating the logical fiber

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The following protection methods belonging to NG WDM optical layer protection are: (Multiple Choice)

• A.1+1 protection inside the board
• B.Optical line protection
• C.ODUk SNCP protection
• D.Customer side 1+1 protection

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The working mode provided by the line fiber quality monitoring function does not include _____.

• A.Automatic mode
• B.Near-end mode
• C.Intra-office mode
• D.Manual mode

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