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

8-6
Planning and Implementation for the HP 2910-PoE+ al Switches
Planning the PoE Configuration
The table in this example configuration contains entries that show the PoE+
power available for the HP 2910al-24G-PoE+ Switch when connecting to an
external power supply.
Figure 8-2. Example of an HP 2910-24G-PoE+ al Switch connecting to an
HP 630 RPS/EPS
Note: The same considerations apply for the mini-GBIC ports as in the
previous example.
One HP 2910-24G-PoE al Switch can be supported by one HP 630 RPS/EPS.
This is a full redundant configuration. The switch can be supplied with power
should either of their internal power supplies fail. The HP 630 RPS/EPS can
supply system power to keep the switch powered on and PoE+ power to
supply the attached PoE+ devices with power.
1
The HP 630 RPS/EPS power supply is rated at 398 watts, however, 388 watts are supplied to
the switch due to line loss on the EPS cable.
HP 2910al 24 port
switch
HP 630 RPS/EPS
Source of
Power
Watts
Available
Number of Ports Powered
and Average watts/Port from
internal supply
Redundant Number of Ports
Powered and Average
watts/Port
Internal PoE+
Power Supply
382 12 @ average 30W each for a
total of 360 W
24 @ average 15.4 W each
24 @ average 7.5 W each
None
Internal plus
External PoE+
Power Supply
382 + 388
1
24 @ average 30.0 W each for
a total of 720
24 @ average 15.4 W each
24 @ average 7.5 W each
12 @ average 30.0 W each
for a total of 360 W
24 @ average 15.4 W each
24 @ average 7.5 W each
External PoE+
Power Supply
(failed Internal
PoE Power
Supply)
388
1
12 @ average 30W each for a
total of 360 W
24 @ average 15.4 W each
24 @ average 7.5 W each
None