The TP-DCDC-1224G-4P is a low cost and high efficiency solution for those requiring 24VDC 4 pair Passive Power over Ethernet from a 12VDC or 24VDC voltage source like a battery system or vehicle. They have an integrated 4 pair PoE injector to apply the power and data output to the CAT5/6 Ethernet cable. All 8 wires carry both data and PoE power. The output voltage is regulated and protected. They have a common (-) and two (+) inputs for connecting 2 power sources, such as a primary with a backup power source. Input and outputs are isolated so + or – ground is OK. They accept gigabit data-in to a shielded RJ45 Jack and provide gigabit data-out and 4 pairt PoE power on the shielded RJ45 output jack. They work by supplying power on Ethernet pins 1,2,4,5(V+) and 3,6,7,8(V-). They have various protections for surge, short circuit and overload. The units have power outputs up to 24W.