What is PoE? Power over Ethernet, or PoE, is the process of sending power & data over twisted pair Ethernet cabling to simplify power requirements. Ethernet cabling consists of 4 twisted pairs. In a FE (10/100mbps) network only two of the four pairs will transmit data, the remaining two are reserved for power. In GE (1Gbps) networks all four pairs transmit data, while two of these pairs transmit power and data simultaneously.