August 22, 2011 AT 3:52 pm

NEW PRODUCT – Passive PoE Injector Cable Set

Poecableuse Lrg

NEW PRODUCT – Passive PoE Injector Cable Set. Simplify your Internet of Things with a passive PoE injector cable. These are quite handy for projects that have Ethernet connectivity and also need a power cable. Of course, you can get a long Ethernet cable but then you have to figure out how to plug it in, making a mess of wires. There is an official Power-over-Ethernet standard that allows devices and routers to activate a 48VDC power line on the unused Ethernet pins (4,5 and 7,8) but PoE is expensive, requiring a special router and then a step-down converter to handle the high 48V line.

Poecabletips Lrg

For DIY projects, you may want to consider using these cables instead. One cable (the injector half) has a 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 in 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.

Poecable Lrg

Note that Ethernet cables, especially 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 meters / 80 feet.

Because these cables use pins 4,5,7, and 8 to pass power you can’t use these in gigabit Ethernet situations (those pins would be used by the gigabit router), but your device and router should back down to 10/100 megabit in such cases.

In stock and shipping now!

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4 Comments

  1. That opens up so many ideas!

    How much current could you safely draw over say 10 metres of ethernet?
    Would there be any difference in the type of ethernet you use? (5e vs 6 for example)

  2. Depending on which PoE spec you look at (802.11at versus 802.11af), anywhere from 350mA to 600mA.

    I just want to say, there should be a gigantic disclaimer on this stating that this is NOT official “Power Over Ethernet” and you cannot power your arduino from an official PoE host device (which will supply 48VDC).

    On the other side, I think this is awesome and has some great potential for project, especially DIY CNC, which loves to use ethernet cables.

  3. Depending on which PoE spec you look at (802.11at versus 802.11af), anywhere from 350mA to 600mA.

    I just want to say, there should be a gigantic disclaimer on this stating that this is NOT official "Power Over Ethernet" and you cannot power your arduino from an official PoE host device (which will supply 48VDC).

    On the other side, I think this is awesome and has some great potential for project, especially DIY CNC, which loves to use ethernet cables.

  4. @h3llphyre – there’s a large bolded statement on the product page, please review it and see if that’s warny enough and if it’s not, feel free to make additional suggestions.

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