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.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.

C.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".

D.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.

A.Create a client service path by using the path method. After the creation, the optical layer OCh path is automatically generated to reduce the secondary teaching of the path creation.

B.Select the "Activate" checkbox. After the path is successfully created, it will be delivered to the NE layer. Otherwise, the path configuration text will only be saved on the network management side.

C.The creation or search of a new path must be possible if its upper service layer path already exists.

D.If the route to be automatically calculated is different from the planned path, you can set the "constrained node" or "must pass through the node" to perform routing constraints.

A.R_LOS

B.MUT_LOS

C.OSC_LOS

D.OSC_RDI

A.First two-way, then one-way first

B.First single wave, followed by multiple waves

C.First locate external and then location transmission

D.First advanced, then low level

A.TRUE

B.FALSE