largely depends on the environment and installation, whereas the first is solely influenced by the cable construction. In a standard unshielded cable, the PoE-related temperature rise increases by a factor of 5. In a shielded cable, this value drops to between 2.5 and 3, depending on the design. Pinouts References External links Buy the IEEE 802.3 standards ieee802.org: IEEE 802.3af Task Force ieee802.org: IEEE 802.3at Task Force ieee802.org: IEEE 802.3bt Task Force Ethernet Networking hardware Network appliances Electric power IEEE standards Power supplies