HP ProCurve 2520 Planning And Implementation Manual page 75

Source of Watts
Power Available
Internal PoE 406
Power Supply
Internal plus 406 + 204
External PoE
1 - 24
Power Supply
External PoE 204
Power Supply
(Failed Internal
PoE Power
Supply)
■ When two switches are connected to the 600 RPS/EPS ports, the PoE
power available to each switch is a maximum of 204 W. If all of your PDs
consume on average less than 7.5 W each (allowing for any line loss) then
all 24 ports will receive redundant power should a switch's internal PoE
power supply fail.
Redundant power is available as long as the total power required remains
below 204 W.
Planning and Implementation for the 2600-PWR Switches
# of Ports Powered and
Average watts/Port Powered and Average watts/
24 @ average 15.4 W each None
24 @ average 15.4 W each 24 @ 7.5 W each
24 @ 7.5 W each
12 @ 15.4 W each
Planning the PoE Configuration
Redundant # of Ports
Port
12 @ 15.4 W each
None
4-5