Abstract: A Power over Ethernet (PoE) system and method that can provide greater power efficiency and reduces greenhouse gas emissions is described. The PoE system includes power supply equipment, Ethernet cabling, and a powered device. When a load is not present at the end of the Ethernet cabling, an injector in the power supply equipment enters a sleep state, thus conserving power and increasing efficiency. When the injector is electrically connected to a load, such as the powered device, a circuit in the injector activates power to a digital control logic and subsequently provides power to a sensing conductor in the Ethernet cable, thereby enabling high efficiency power transfer.

Abstract: A Power over Ethernet (PoE) system and method that can provide greater power efficiency and reduces greenhouse gas emissions is described. The PoE system includes power supply equipment, Ethernet cabling, and a powered device. When a load is not present at the end of the Ethernet cabling, an injector in the power supply equipment enters a sleep state, thus conserving power and increasing efficiency. When the injector is electrically connected to a load, such as the powered device, a circuit in the injector activates power to a digital control logic and subsequently provides power to a sensing conductor in the Ethernet cable, thereby enabling high efficiency power transfer.