What is a PoE Injector?

This video talks about POE injectors. To understand POE injectors, we have to refresh our memory on POE. POE technology transmits power and data through a single Ethernet connection. There are too situations where we need a POE injector: (1) when the power budget is not enough, and (2) when we need a network upgrade. A POE injector is an easy plug-and-play device which injects power to the Ethernet and transmit POE signals.