The Gigabit compatible TP-DCDC-2456G-VHP and TP-DCDC4856G-VHP area special very high-power DC to DC converters / PoE inserters 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.