Table 7: Power Budgets Of The At-Pwr800 Power Supply - Allied Telesis AT-x930-28GTX Installation Manual

Chapter 1: Overview
36
Note
The AT-PWR250 and AT-PWR250-80 Power Supplies are intended
for the non-PoE AT-x930-28GTX and AT-x930-52GTX Switches.
They are not intended for the AT-x930-28GPX and AT-x930-52GPX
Switches because they do not provide power for PoE + devices. You
may install them in the PoE+ switches, but the switches will not
support PoE devices.
Another factor that determines the power budget of the switch is the
number of PoE power supplies in the device. The power budget of a PoE
switch that has only one PoE power supply is equal to the budget of the
power supply.
A PoE switch with two AT-PWR800 or AT-PWR1200 Power Supplies has
either double the power budget or redundant PoE power. This is controlled
by the power boost feature, which has a status of either enabled or
disabled. When the power boost feature is enabled, a PoE switch with two
power supplies actively uses the PoE power from both supplies to double
its available power budget. When the feature is disabled, the switch uses
the PoE power of only one of its power supplies and keeps the other in
reserve in case the primary power supply should fail or lose power.
As an example, assume that a PoE switch has one AT-PWR800 Power
Supply, which has a power budget of 480W for powered devices. Thus,
the switch would have a total power budget of 480W. Now assume the
switch has two AT-PWR800 Power Supplies. When the power boost mode
is enabled, the switch uses the PoE power from both supplies, for a total
power budget of 960W. When the power boost mode is disabled, the
switch has an active PoE power of 480W and a redundant budget of the
same amount. The switch activates the redundant power budget only if the
power supply providing the active power budget fails or loses power.
Table 7 lists the power budgets for the switch with one or two AT-PWR800
Power Supplies and the power boost mode.
Table 7. Power Budgets of the AT-PWR800 Power Supply
Number of
Power State of Power
Supplies in the
Switch
One NA
Two Enabled
Two Disabled
Power Budget
Boost of the Switch
480 watts
960 watts
480 watts
Redundant
Power
0 watts
0 watts
480 watts