A.When the input optical power cannot be increased by adjusting the adjustable attenuator, the adjustable attenuation at the input of the amplifier is removed.

B.Improve the sending optical power of the originator

C.Set the OAU gain so that its output reaches the nominal value

D.Adjust the dimmable fading before the terminating amplifier to increase the input optical power of the amplifier

A.Fiber extractor

B.U2000

C.Anti-static gloves

D.Shielding bag

A.First low speed, then high speed

B.First advanced, then low level

C.First external, then transfer

D.First network, then network element

A.Timing synchronization

B.Automatic synchronization

C.Manual synchronization

A.The downstream power detection unit (OA) detects that the line attenuation deviation exceeds the threshold and reports the alarm to its own SCC board.

B.The SCC board at the downstream site of the fault reports the alarm to the power detection unit (OA) of the first node through DCN communication, and reports the alarm to the SOM on the SC of the first node.

C.According to the user adjustment command, adjust the line attenuation of the OCh path to make the downstream light output reach the normal value.

D.After receiving the alarm, the SOM obtains the OCh path corresponding to the alarm and adds it to the management path to be optimized.