If you look at the Ubiquiti PoE datasheet (https://dl.ubnt.com/datasheets/poe/PoE_Adapters_DS.pdf) you will see that around half of the midspan PoE injectors are proprietary. This is not unusual for SOHO and SME wireless products - you just need to make sure you purchase the correct one for your model of access point.
The Ubiquiti midspan PoE injectors are all mode B (the conductors are pins 4, 5, 7 and 8) but the models starting POE-24 have output voltages of 24 volts. The IEEE 802.13af, Std 802.3-2005 Clause 33 and 802.3at-2009 amendments define the power output as a nominal 48 volts (44 to 57 volts).


