HP ProCurve 2520 Planning And Implementation Manual page 105

The table in this example configuration shows the PoE power available for
the HP ProCurve 3500-24-PoE switch when configured with an external power
supply.
3500- 24 port
switches
620 RPS/EPS
Figure 8-2. Example of two HP ProCurve 3500-24-PoE Switches connecting to an
The same considerations apply for the mini-GBIC ports as in the previous
example.
Two HP ProCurve 3500-24-PoE switches can be supported by one 620 RPS/
EPS. This is a full redundant configuration—both of the switches can be
supplied with power should either of their internal power supplies fail. The
620 RPS/EPS can supply system power to keep the switch powered on and
PoE power to supply the attached PoE devices with power.
Internal PoE
Power Supply
Internal plus
External PoE
Power Supply
External PoE
Power Supply
(failed Internal
PoE Power
Supply)
HP ProCurve 620 External and Redundant Power Supply (J8696A)
Source of Watts
Power Available
398
398 + 388
388
Planning and Implementation for the 3500 Switches
Planning Your PoE Configuration
# of Ports Powered and
Average watts/Port from
internal supply
24 @ average 15.4 W each for
a total of 369.6 W
24 @ 15.4 W each for a total
of 369.6 W
24 @ average 15.4 W each for
a total of 369.6 W
Redundant # of Ports
Powered and Average
watts/Port
None
24 @ average 15.4 W each
for a total of 369.6 W
None
8-3