The PoE power system consists of Power supply equipment and powered devices. The Power supply equipment (also named PSE) includes PoE switch, PoE injector and PoE NVR. All these devices can power and data to edge devices like IP camera, access point, VoIP phone. This video explains what is the difference between PoE switch and PoE injector. Generally speaking, The PoE switch not only can provide power but also the data exchanging between the IP devices. The PoE injector simply is a power supply unit which can add the power to Ethernet cable. If you have any questions, please don’t hesitate to post comment below. If you want to get more details about products in the video, please turn to: