HP ProCurve Planning And Implementation Manual page 17

Table 2-2. Power Usage
Class Usage
0 Default
1 Optional
2 Optional
3 Optional
As you can see in the table, any 802.3af compliant PD will never require more
than 12.95 watts. The switch provides a minimum of 15.4 watts at the port in
order to guarantee enough power to run a device, after accounting for line loss.
Minimum Power Levels Range of Maximum
at Output of PSE Power required by
the PD
15.4 Watts 0.44 to 12.95 Watts
4.0 Watts 0.44 to 3.84 Watts
7.0 Watts 3.84 to 6.49 Watts
15.4 Watts 6.49 to 12.95 Watts
Operating Rules
External Switch Power
2-7