There are four classes of PoE: Class 1, 2, 3 and 0. Each PoE classification denotes a range of power that is available to the end device as well as the power that must be available on the port of the power sourcing equipment (PSE):
- Class 1 -- 4.5 watts at PoE port; 3.84 watts at device
- Class 2 -- 7.5 watts at PoE port; 6.49 watts at device
- Class 3 -- 15.4 watts at PoE port; 12.95 watts at device
- Class 0 -- 15.4 watts at PoE port; .44 to 12.95 watts at device
Power planning is where the rubber meets the road, and it brings up a challenge in our industry.