Power Over Ethernet Passive PoE Injector Cable Set

Power Over Ethernet Passive PoE Injector Cable Set Use any CAT-5 cable to power a device remotely. Use existing power supplies, any voltage up to 48V. Determine the distance using an online distance calculator.

For DIY projects, you may want to consider using these cables instead. One cable (the injector half) has an Ethernet plug and port and a 2.1mm jack. When you plug in a power supply (say a 9VDC wall adapter), the injector merges the power adapter so that pins 4 and 5 connect to the power adapter ground and pins 7 and 8 have the positive 9VDC. The other cable (the extractor half) does the opposite, splitting off pins 4,5 and 7,8 and bringing them to a 2.1mm DC barrel plug. You can then use the DC plug to power your projects as if it was connected directly to the wall adapter.

These are NOT official/standard “Power Over Ethernet” cables, and you cannot use these to provide power to an Arduino or other products from an official PoE host device (which will supply 48VDC). They must be used as a pair!

Note that Ethernet cables, exceptionally long ones, will act like resistors as you get past 10-meter spans. Most Ethernet cables are 24AWG, 0.085 ohms per meter (0.026 ohms per foot), so if you want to draw, say, 500mA from your adapter, there will be a 1 Volt drop for every ~25 meter/ 80 foot.

1X Female RJ45 connector to 2.1mm x 5.5mm female jack

1X Female RJ45 connector to 2.1mm x 5.5mm power plug