TP-DCDC-2456G-VHP is a special very high power DC to DC converter / PoE
inserter designed for use with Ubiquity airFiber and other devices that accept
poE power on all 4 Ethernet pairs.
The DCDC converter supplies 35W per poE channel. One PoE channel is using
pins 4,5,7,8 and the other PoE channel utilizes pins 1,2,3,6. By splitting the
power onto separate PoE channels, the device can achieve 70W total supplied
power to the end device.
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.