This power injector allows an existing Ethernet infrastructure to be enhanced for use with PoE cameras. System overview The NPD-5004-POE four-port power injector can supply four individual PoE cameras with power. Functions The injector converts the AC input power to a +48 VDC power supply which is then provided to the cameras via the Ethernet cable. They support up to 10/100/1000 Mbps pass-through data rates. Each injector provides up to 15.4 W per port. The PoE midspan injector unit can be easily mounted on a shelf, wall or ceiling