PoE Injector is also called Power over Ethernet mid-span device. Single port PoE injector is PoE power supply module. There are 2 x RJ45 PoE ports one of which is the Ethernet In Port for the uplink of upper switches or other upper network devices, and another is PoE Out port used as the port for network data and power output. These single-port PoE injectors supply power with the spare line pair (4/5 (+), 7/8 (-) method or the data line pair 1/2(+), 3/6(-) method. These single-port PoE injectors provide a simple, economical, high-performance and intelligent way for Ethernet PoE power supply and data communication. They can supply power to HD webcam through Cat5 Ethernet cable.