Huawei OptiX RTN 980 Quick Installation Manual page 10

Precautions for Handling IF Boards
CAUTION
Remove or insert an IF board only after powering off the ODU.
1
Power off the ODU.
Skip this step if a dual-channel IF
board is concerned.
CAUTION
Do not remove or insert an IF board when the ODU is powered on.
2
Disconnect the IF jumper.
7
3
Remove the IF board.
3
Insert the IF board.
Remove or insert the IF board.