This video is about if a PoE spitter is necessary in a PTZ camera setup with a PoE injector. A PoE system can transmit power and data through a single Ethernet, but also needs both ends to be PoE enabled. If a PoE system does not provide power at the start of transmission, we will need a PoE injector, if the device connected to the system is not PoE enabled, we would need a PoE splitter to split the power and data before they reach the device.