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18-36VDC Input, Dual 56V 802.3at Gigabit PoE Output, 70W The TP-DC-2448GDX2-HP is a unique high power PoE injector with Dual 802.3af/at compatible outputs. This means that two devices can be powered from a single PoE injector. The data path between the devices is handled by the injector so no PoE switch is required. This model runs on 24VDC as well as 110/220VAC grid power. The total combined output is up to 70W. They have two DC inputs for connecting 2 power sources, like a primary and backup power source. They have various protections for short circuit, overload and surges caused by ESD or lightning. The built-in surge protection protects sensitive connected devices from damage due to surges on data and PoE lines. All 8 wires are protected. The input voltage and output voltage are isolated to avoid any grounding or negative voltage issues.