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

Chapter 1: Overview
34
Note
The AT-PWR250 and AT-PWR250-80 Power Supplies are intended
for the non-PoE AT-x930-28GTX, AT-x930-28GSTX, 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. For example, a switch that has one AT-PWR1200 Power
Supply has a power budget of 740W for powered devices.
A PoE switch with two AT-PWR800 or AT-PWR1200 Power Supplies has
either redundant PoE power or nearly double the power budget. 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
increase 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-PWR1200 Power
Supply, which has a power budget of 740W for powered devices. Thus,
the switch would have a total power budget of 740W. Now assume the
switch has two AT-PWR1200 Power Supplies. When the power boost
mode is enabled, the switch uses the PoE power from both supplies, for a
total power budget of 1440W. When the power boost mode is disabled,
the switch has an active PoE power of 740W 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
380 watts
740 watts
380 watts
Redundant
Power
0 watts
0 watts
380 watts