The Gigabit compatible TP-DCDC4856G-VHP is a special very high power DC to DC converter designed especially for Ubiquiti airFiber antenna systems and other systems which require high power passive POE such as Axis High Power POE PTZ security cameras. The unique POE inserter supplies 56VDC POE power on all 8 Ethernet wires. They have two isolated inputs for connecting 2 power sources, like a primary and backup power source. They have various protections for surge, short circuit and overload. The input and output are isolated.