The TP-DCDC-4848-HP offered by Tycon Power is a low cost and high reliability solution for those requiring passive 56VDC Power over Ethernet voltage from a 48V battery system. They have an integrated PoE injector. They have two inputs for connecting 2 power sources, like a primary and backup power source.
They accept data-in to a shielded RJ45 Jack and provide data-out and PoE power on the shielded RJ45 output jack. They work by supplying power on the unused Ethernet pins 4,5(V+) and 7,8(V-). They have various protections for surge, short circuit and overload. The units have a power output of up to 35W. The input and output are isolated so the units can accept minus voltage on input and can be wired for positive voltage on the output for those systems which are negative voltage based.