802.3at-2009[6] PoE standard also known as
PoE+ or
PoE plus, provides up to 25.5 W of power for Type 2 devices.
[7] The 2009 standard prohibits a powered device from using all four pairs for power.
[8] Both of these standards have since been incorporated into the
IEEE 802.3-2012 publication.
[9]
The
IEEE 802.3bt-2018 standard further expands the power capabilities of 802.3at. It is also known as
PoE++ or
4PPoE. The standard introduces two additional power types: up to 51 W delivered power (Type 3) and up to 71.3 W delivered power (Type 4). Each pair of twisted pairs needs to handle a current of up to 600
mA (Type 3) or 960 mA (Type 4).
[10] Additionally, support for
2.5GBASE-T, 5GBASE-T and
10GBASE-T is included.
[11] This development opens the door to new applications and expands the use of applications such as high-performance
wireless access points and surveillance cameras.