Your Axis P3255 uses a 30W PoE.. the data sheet says it uses 802.3at standard PoE, type 2, Class 4. The ubiquiti PoE unit doesn't seem to mention any 802.3 standard in it's data sheets. ( 802.3bt would be the closest, but it doesn't have an 80W standard)
In PoE the device and power supply...