PoE/PoE+ Planning and Implementation Guide 2011-09

7-4
Planning and Implementation for the E2620 PoE+ Switches
Planning Your PoE Configuration
One E2620-24-PoE+ switch can be supported by one 630 RPS/EPS. This is a
full redundant configuration. The switch can be supplied with power should
the internal power supply fails. The 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 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 E2620-48-PoE+ Configuration
PoE+ power requirements are figured differently for the E2620-48-PoE+
switch, see PoE+ Power on page 2-14. The table in this example configuration
contains entries that show the PoE+ power available for the E2620-48-PoE+
switch.
In the default configuration PoE+ power priority is determined by port
number, with the lowest numbered port (port 1) having the highest priority,
and the highest numbered port (port 48) having the lowest priority.
Note It is the ports configured with the highest priority of either bank (1-24 or
25-48) that will receive PoE+ power first. For example, if the highest priority
ports have been re-configured to be 23, 24 and 47, 48, then they will receive
PoE+ power before the lower priority ports.
Source of
Power
Watts
Available
# of Ports Powered and
Average watts/Port from
internal supply
Redundant # of Ports
Powered and Average
watts/Port
Internal PoE+
Power Supply
364 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
364 + 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