One advantage of PoE is that the power supply can be located anywhere within 100 meters of the application versus a separate power source that would need to be located within 6 feet. With PoE, the power supply can be located in a wiring closet or anywhere that is away from the application. So power and data are united with only one wire, versus two wiring solutions. This results in lower installation costs since PoE eliminates the need for running both data and power wires to each network device.