Power over Ethernet extends range to more devices: You stick your access points in the ceiling for best coverage and then spend a bundle putting electrical outlets up there, too. Instead, more companies and schools are turning to Power over Ethernet, which can deliver enough juice over standard Ethernet cables to run devices like Wi-Fi access points, video cameras, and intercoms.
The savings cited in the article for specific projects are quite staggering. Running Ethernet cable is typically cheaper than installing full-blown alternating current. In many states, Ethernet wiring must be done by professional electricians, however, because it qualifies as low-voltage wiring and runs though the walls.