Which of the following statements about clock sources is wrong?

• A.Select the same SSM protocol for all NEs in the clock protection subnet
• B.If the standard SSM protocol is enabled, you need to set the clock source ID
• C.The internal clock source has the lowest priority due to low precision
• D.Usually the tributary clock is not used as the clock source of the device

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In a 1+1 OTS optical line protection scenario, when the network is normal, the input optical power of the RI1 port on the OLP board is 10 dBm and that of the RI2 port on the OLP board is 8 dBm. The initial input difference between the working and protection channels is set to the default value 0dB, and the input difference threshold of the working and protection channels is set to default value 5dB. Which of the following scenarios can trigger switching?

• A.The active optical cable is broken, and the loss of the standby optical cable increases by 5 dB.
• B.The loss of the active optical cable increases by 6 dB. and the loss of the standby optical cable remains unchanged.
• C.The loss of the active optical cable increases by 7 dB. and the loss of the standby optical cable increases by 2 dB.
• D.The loss of the active optical cable increases by 7 dB. and the loss of the standby optical cable remains unchanged.

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Which of the following descriptions about the Directioned scene is correct? (Multiple choice)

• A.If the current path needs to be adjusted, it is necessary to enter the station to adjust the fiber connection of the network.
• B.When the service needs to be adjusted, or when the working path fails and the protection path is used, the optical cross-connect can be manually configured to realize flexible scheduling of services.
• C.Directioned scenarios are applied to non-ASON networks
• D.The wavelength carrying local traffic can be transmitted in a fixed direction.

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Which of the following clock operating modes supports the ITU-TG781 standard? (Multiple choice)

• A.Tracking
• B.Keep
• C.Run free
• D.Master/slave

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Which of the following elements does a data communication network have in terms of equipment? (Multiple choice)

• A.Switching devices
• B.Core equipment
• C.Terminal equipment
• D.Transmission system

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