The transmission plane mainly performs functions such as optical signal transmission, multiplexing, configuration protection switching, and reconnection, and ensures the reliability of the transmitted optical signal. However, the exchange action of this layer is carried out under the influence of the management dry surface and the control plane.

• A.FALSE
• B.TRUE

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Which of the following functions is added to EX40 compared with X40?

• A.More multiplexed and demultiplexed wavelengths
• B.Fewer slots are occupied.
• C.Supports optical-layer cross-connections.
• D.Monitors the optical power of a single channel.

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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.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.
• 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.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.
• D.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.

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

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Which of the following are the components of general package format of PWE3? (Multiple Choice)

• A.Type
• B.CW (Control Word)
• C.Payload
• D.MPLS label

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