Hello Jaime-
The GSS has a "shutdown" command at the enable prompt.
For the ACE 4710 - you can hold down the power button on the front, there is no cli command.
For the ACE10-mod-k9 and ACE20-mod-k9, you can issue "no power enable module X"
On a side note, there is a "shutdown" button on the front of the ACE modules that you can use a paperclip to access. However, functionality of this button is actually to reset the module, not power it off.
cat-1#sh module
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
1 6 Firewall Module WS-SVC-FWM-1 SAD084305R8
2 1 Application Control Engine Module ACE10-6500-K9 SAD094701MY
3 1 Application Control Engine Module ACE20-MOD-K9 SAD1141053B
5 2 Supervisor Engine 720 (Active) WS-SUP720-3BXL SAD081200ES
6 48 48-port 10/100 mb RJ45 WS-X6148-RJ45V SAL0651ADR6
9 3 AON Module WS-SVC-AON-1-K9 SAD08320722
cat-1(config)#no power enable module ?
<1-9> module slot number
cat-1(config)#no power enable module 3
%Power admin state updated
Regards,
Chris Higgins