Power over Ethernet (PoE) Tutorial

Our connected devices usually have two connections: One for data and the other for power. If we use an Ethernet cable, we can combine data and power on the same cable. Very convenient. Do you know how this “Power over Ethernet” or PoE works and what we have to do to take advantage? Let’s have a closer look. Links: Wall injector: Long injector: Small injector: PoE hat large: