With the 802.3bt standard, IEEE has standardized a PoE method, Power over Ethernet (PoE), which in terms of power is far above the classic methods according to IEEE 802.3af and 802.3at and supports supply powers of up to 90 W. This is also referred to as PoE++. It is therefore also referred to as PoE++.
In contrast to the other two methods mentioned, IEEE 802.3bt works with four pairs of a LAN cable: 4 Pair Power over Ethernet( 4PPoE). In theclassification of power levels, these are power classes 5, 6, 7 and 8, whereas 802.3at supports power classes 3 and 4 and 802.3af supports power classes 0, 1 and 2. Power sourcing equipment( PSE) supply powers range from 45 W, 60 W, 75 W, and 90 W, depending on the power class, while power at the powered devices( PD) range from 40 W to 72 W. The power difference between the power sourcing equipment and the powered equipment corresponds to the power dissipation in the power cabling. The supply voltages are 50 V and 52 V.