When the working channel of the optical line protection fails, it cannot be automatically switched to the protection channel. What are the possible reasons? (Multiple choice)

• A.Artificially issued a lock command
• B.The protection channel is faulty
• C.Protection group parameter configuration is error
• D.Waiting for the recovery time to be set too long

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For a 10G OTU board, the receiving end optical module uses PIN module. Which of the following receiving powers is in the normal receiving range of the board?

• A.9dBm
• B.-19dBm
• C.-9dBm
• D.19dBm

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

• A.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.
• B.The network element broadcasts the clock quality information and the clock source ID of the synchronization source through the downstream station between the S1 bytes, and notifies the upstream station 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.
• C.The network element broadcasts the clock quality information of the synchronization source to the downstream site through the S1 byte, and notifies the upstream station 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.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 homologous source.

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The 40 Gbit/s and 100 Git/s coherent systems do not require dispersion compensation because the coherent board has a large dispersion tolerance. NG WDM does not support non-coherent networks and coherent networks for hybrid transmission.

• A.FALSE
• B.TRUE

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The OTN circuit board (such as ND2) of OSN 1800V can respond to the status of the indicator light on the panel to reflect the optical power of the local end too high or too low.

• A.TRUE
• B.FALSE

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