Transition Networks SM8TAT2SA - Page 64

Five PD Classes are defined by the IEEE standards:
Class Usage
Classification
Current [mA]
Power Range [W]
Class
Description
0 Default 0–4 0.44–12.94
Classification
unimplemented
1
Optional
9–12
0.44–3.84
Very Low power
2
Optional
17–20
3.84–6.49
Low power
3
Optional
26–30
6.49–12.95
Mid power
4
Valid for 802.3at (Type 2) devices, not
allowed for 802.3af devices 36–44
36–44 12.95–25.50 High power