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

12-11
Planning and Implementation for the HP 3800-PoE+ Switches
Planning the PoE+ Configuration
The table in this example configuration contains entries that show the PoE+
power available for the HP 3800-48G-PoE+-4SFP+ or HP 3800-48G-PoE+-4XG
Switch when two power supplies are installed.
Figure 12-4. Example of HP 3800-48G-PoE+-4SFP+ or HP 3800-48G-PoE+-4XG
Switch with two power supplies installed
The switch can supply full redundant power from the second power supply
should one of the power supplies fail, however PoE/PoE+ power will be
reduced until the failed power supply is replaced.
The lowest loaded bank of ports (1-24 or 25-48) has 22 watts reserved. That
power is available for use by the two highest priority ports in the bank, (in a
default configuration ports 1 and 2, or 25 and 26).
36 ports can supply up to 30 watts
of PoE+ power
Source of
Power
Watts Available Number of Ports Powered
and Average watts/Port
Redundant Number of
Ports Powered and
Average watts/Port
Two 1000
watt Power
Supplies
185 W for system
use, and 515 W+
700 W (for a max of
1080 W) @ 110 V
36 @ average 30 W each for a
total of 1080.
48 @ average 15.4 W each
48 @ average 7.5 W each
17 @ average 30 W each
for a total of 570 W
33 @ average 15.4 W each
48 @ average 7.5 W each
Two 1000
watt Power
Supplies
185 W for system
use, and 815 W+
1000 W (for a max of
1080 W) @ 220 V
36 @ average 30 W each for a
maximum of 1080 W
48 @ average 15.4 W each
48 @ average 7.5 W each
27 @ average 30 W each
for a total of 810 W
48 @ average 15.4 W each
48 @ average 7.5 W each