Make sure this fitsby entering your model number. Use any CAT-5 cable to power a device remotely. Use existing power supplies, any voltage up to 48V. Determine the distance using our in line distance calculator This Power over Ethernet injector allows you to power devices remotely and eliminates the need for 110vac transformers at the far end. The 2.1mmx5.5mm DC jack and plug allow power to be sent on the CAT-5 and split out again at the remote end. Since standard Ethernet needs only 2 of the 4 pairs in a CAT-5 cable, 2 pairs are unused. Passive POE uses pins 4/5 for plus power, and 7/8 for ground.