A.Downgrade to traditional business reconstruction and restoration

B.Download network element database recovery

C.Forced reactivation to restore

D.Optimize to other path recovery

A.Docking with PTN equipment

B.Realize physical layer synchronization

C.Docking with STM-N interface

D.Docking with ODUk interface

E.Interfacing with customer equipment

F.Realize IEEE 1588 V2 synchronization

A.Session initialization

B.Session announcement

C.Information query

D.Session maintenance

A.TRUE

B.FALSE

A.The source and sink optical amplifiers of the optical crossover at this site must be in the same network element

B.There is a local optical amplifier but no filter, the full-wave noise of the local optical amplifier affects the OSNR of the wavelength in the pass-through direction

C.If the local RMU is used to add waves and has an optical amplifier, the OSNR value of the wavelength in the pass-through direction detected by SOM will deviate from the actual value