What is a Power over Ethernet (PoE) injector?
A PoE injector connects the PoE-enabled network device to a non-PoE LAN switch port. More specifically, a PoE injector can be used to connect a wireless access point, IP phone, network camera, or any IEEE 802.3af/at-powered device (PD) to a network switch.

What is the difference between PoE Extender and PoE Injector?
This PoE injector uses the network cable to power the PoE equipment. The PoE splitter splits the power from the data and feeds it to a separate input. PoE extenders receive data and power from the PoE injector and PoE switch.