The difference between 802.3af vs. 802.3at (PoE vs. PoE+, respectively) is the amount of power delivered. The 802.3af PoE standard delivers 15.4 Watts to endpoint devices, while the more recent 802.3at PoE standard delivers 25.5 Watts to endpoint devices.
Passive PoE usually refers to any device using PoE that is not 802.3af or 802.3at. Це включає в себе пристрої, як камери і радіо антени, які йдуть на 24V PoE.
What is 802.3at? 802.3at standard збільшив максимальну потужність до 25.5 watts. It is commonly referred to як PoE+ or PoE Plus.