Allied Telesis AT-RPS3000 - Manual (Page 74)

Chapter 2: Installing the AT-RPS3000 Chassis and Power Supply Modules
74
8. If the chassis has two power supply modules, repeat this procedure to
power on the second module.
Warning
This unit might have more than one power source. To reduce the
risk of electric shock, disconnect all power cords before servicing the
unit.  E30
This completes the installation procedure for the AT-RPS3000 Redundant
Power Supply.