PoE/PoE+ Planning and Implementation Guide 2011-09

12-3
Planning and Implementation for the E3800 Switches
Planning Your PoE or PoE+ Configuration
All these calculations assume worst-case device power and 100M cables and
are the most conservative estimate of what can be supported. Actual power
usage and number of devices supported will be different in each case.
HP E3800-24G-PoE+-2SFP+ or HP E3800-24G-PoE+-
2XG Switch Configurations
The table in this example configuration contains entries that show the PoE
power available for the E3800-24G-PoE+-2SFP+ or E3800-24G-PoE+-2XG
Switch when using only one power supply.
Figure 12-1. Example of the E3800-24G-PoE+-2SFP+ or E3800-24G-PoE+-2XG Switch
with one power supply installed
In this configuration there is no backup if the power supply fails. All switch
power and PoE power will be lost.
19 ports can supply up to 30 watts
of PoE+ power or 24 ports can
supply 15.4 watts of PoE power
Source of
Power
Watts
Available
# of Ports Powered and
Average watts/Port
Redundant # 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