Guidelines - Allied Telesis AlliedWare Plus Installation Manual

A PoE+switch with two AT-PWR1200 Power Supplies has these power
characteristics:
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Guidelines

Please review the following guidelines concerning power supplies:
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Refer to "Technical Specifications" on page 203 for the input voltage
ranges.
Full system power and redundant system power
Either 1440 watts of PoE power or 740 watts of active PoE power
and 740 watts of redundant PoE power.
The x930 Series Switches do not come with power supplies. Power
supplies must be ordered separately.
If you install two power supplies in the switch, they must both be
the same model. For example, you may install two AT-PWR800
Power Supplies or two AT-PWR1200 Power Supplies in a switch.
You may not install two different power supply models in the
switch.
The non-PoE AT-x930-28GTX, AT-x930-28GSTX,and AT-x930-
52GTX Switches require only one power supply for full operations.
Installing a second power supply adds power redundancy, which
protects against interruptions to network operations in the event a
power supply loses power or fails. Power redundancy is available
only when both AC or DC connectors on the switch are connected
to power sources.
The PoE AT-x930-28GPX and AT-x930-52GPX Switches also
require only one power supply for network operations, excluding
PoE+. The switches can continue to operate even if one power
supply fails or loses power. Adding a second power supply in the
PoE+ switches either increases the amount of power for powered
devices or adds PoE+ redundancy. For further information, refer to
"Power Budget" on page 34.
You may install AT-PWR800 and AT-PWR1200 Power Supplies in
non-PoE x930 Switches. The power supplies will provide system
power only.
The DC wires for the AT-PWR250-80 DC Power Supply should be
routed from a DC load center containing appropriate overcurrent
branch protection for each DC feed, as required by the cognizant
local electrical authority.
Warning
Power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord.  E3
x930 Series Installation Guide for Virtual Chassis Stacking
29