Allied Telesis AT-SBx31CFC960 - Manual (Page 278)

Chapter 13: Replacing Modules
278
Note
Perform steps 5 to 7 to enable the new fan module if you disabled
the old module with the DISABLE FANMODULE command prior to
removing it.
5. Start a management session on the chassis. For instructions, refer to
“Starting a Local Management Session” on page 212.
6. At the command prompt, enter the ENABLE FANMODULE command
to enable the module.
7. Log off to end your management session.