2-7
Operating Rules
External Switch Power
Operating Rules
Table 2-2. Power Usage
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.
Class Usage Minimum Power Levels
at Output of PSE
Range of Maximum
Power required by
the PD
0 Default 15.4 Watts 0.44 to 12.95 Watts
1 Optional 4.0 Watts 0.44 to 3.84 Watts
2 Optional 7.0 Watts 3.84 to 6.49 Watts
3 Optional 15.4 Watts 6.49 to 12.95 Watts
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