IEEE 802.3bt (Hi-PoE)
The IEEE ratified the 802.3bt standard in September 2018. It defines two standards of PoE: PoE++ (Type 3) and high powered PoE (or HI-PoE/Type 4). Type 3 provides up to 60W at each PoE port, with 51W available to the powered device (PD). The power reduction happens because of power loss during the transmission process. Type 4 supplies a maximum output of 100W (with 71W available to the PD).