A.The modulation technology used in a 40G coherent system is ePDM-BPSK.

B.The modulation technology used in a 100G coherent system is ePDM-BPSK.

C.The modulation technology used in a 40G coherent system is ePDM-QPSK.

D.The modulation technology used in a 100G coherent system is ePDM-QPSK.

A.+4dBm

B.-2dBm

C.+1dBm

D.+7dBm

A.Control the incoming fiber power

B.Using large effective area fiber

C.Control the optical power of a single wavelength

D.Do not use G.653 fiber in DWDM systems

A.The path with the protected route is to be broken or switched. Ensure that the configuration is complete and standardized.

B.Try to use the path function to configure.

C.Guide users to learn business configuration specifications.

D.The service of the single-station configuration should perform path search on the network to ensure that the service configuration is complete and standardized.

A.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.

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.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.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.