HP Power over Ethernet (PoE/PoE+) Planning and Implementation Guide

12-7
Planning and Implementation for the HP 3800-PoE+ Switches
Planning the PoE+ Configuration
In this configuration there is no backup if the power supply fails. All switch
power and PoE power will be lost.
The table in this example configuration contains entries that show the PoE
power available for the HP 3800-24G-PoE+-2SFP+ or HP 3800-24G-PoE+-2XG
Switch when two power supplies are installed.
Figure 12-2. Example of the HP 3800-24G-PoE+-2SFP+ or HP 3800-24G-PoE+-2XG
Switch with two power supplies installed
Two power supplies can be installed in the HP 3800-24G-PoE+-2SFP+ or HP
3800-24G-PoE+-2XG Switch to add more PoE/PoE+ power or to provide
backup power should one of the power supplies fail.
For example, if there are two 1000 watt power supplies installed, wattage from
one of the power supplies can be used to supply PoE/PoE+ power to the ports
and the other power supply can be held in reserve. Should the first power
supply fail the reserve power supply can pick up the load and supply the
needed PoE/PoE+ power. Or, both power supplies can be used to supply a
maximum wattage of PoE/PoE+ power.
Source of
Power
Watts
Available
Number of Ports Powered
and Average watts/Port
Redundant Number of Ports
Powered and Average watts/
Port
One 1000
watt Power
Supply
127 W for
system use,
and 573 W for
PoE+ @ 110 V
19 @ average 30 W each for
a total of 570 W.
24 @ average 15.4 W each
24 @ average 7.5 W each
None
One 1000
watt Power
Supply
127 W for
system use,
873 W for
PoE+ @ 220 V
24 @ average 30 W each for
a total of 720 W.
24 @ average 15.4 W each
24 @ average 7.5 W each
None
All 24 ports can supply up to 30
watts of PoE+ power or 15.4 watts
of PoE power