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Power Over Ethernet Router Conversion

Power Over Ethernet Router Conversion
The idea driving this project is to turn any standard, off-the-shelf router into a Power Over Ethernet (PoE)-capable (Wikipedia Description)[] unit without buying any adapters or additional hardware.

PoE is somthing fairly common in many business/office spaces. For example, many wireless access points in office buildings and universities use the technology so they don't have to run a power receptacle to wireless access points. For this instructable though, we're going to use PoE in a residential setting. Even the big router companies are starting to sell these adaptors to consumers like this Linksys WAPPOE12. But I think it costs way too much and is kinda bulky. If you're into the DIY bulky thing though/have a need for an external PoE injector, you could try this option.

Applications for this instructable are up to your imagination. You might be relocating your wireless router to the centre of a house for better reception even though the cable modem installer might have put the cable modem say in the basement/some other inconvenient spot. Another useful application might just be to make an all weather-sealed outdoor access point with the famous WRT54G router inside it.

In my case, I will be using a 5 year-old WIRED router that I had lying around. Have no fear though, the points where we will be soldering are identical on every router/switch that you can get today. I should note that we're using cat5 here. If all you have is cat6, you can still go ahead and use that. But I should note, if you're connecting to a gigabit ethernet device, this instructable won't work. Luckilly, cable modems don't work at GigE speeds and I doubt the WAN port on your router supports GigE.

To begin we'll need some basic things:
1. A router
2. A length of cat5 cable (length depending on your location...mine was 10 ft.)
3. RJ-45 connector ends (...ok 8P8C for you technical people)
4. RJ-45 cable booties
5. A wall wart (power supply brick)
6. Some heat shrink tubing (I just used some random scraps I had lying around)
7. Your trusty soldering iron and some solder
 
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Step 1Open it up!

Open it up!
First off let's unplug everything from the router. Not just power but the ethernet cables too that will otherwise get in the way of things.

Next, we'll open up the router. Be careful though before you, start prying off the plastic casing and it snaps. There's usually a screw hidden under the label with the serial number, etc... on the bottom of the unit. It's the indicator for the manufacturer to see if you've voided your warranty. Oh, and by the way, this instructable\ will definitely void your warranty. Something I take no responsability for.
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28 comments
Jun 16, 2011. 1:17 PMtoby12188 says:
If you do like you said and use your computer's PSU to power your router, be sure to tap a 5 volt source instead of a 12 volt source, routers don't work very well after you've let the magic smoke out!
Feb 16, 2008. 8:41 PMxtank5 says:
So this lets you power your router using your Ethernet cable AND it lets you surf the web. I'm sorry I couldn't understand quite well.
Feb 16, 2008. 8:43 PMxtank5 says:
LOL. I just read the Wikipedia description and I guess it does what I thought it does. I guess I should read before I write. LOL.
Jun 23, 2010. 12:25 PMRedgerr says:
smooth, no worries everythings good
Sep 21, 2009. 3:52 PMGrooby says:
Could you have 2 devices that need power like a hub and a switch and run them off the same wall adapter? The voltages will be the same.
Mar 23, 2009. 6:42 PMbwpatton1 says:
actually I have antenna internet through Internet America and the power is provided to the equiptment through this method, there is adapter that uses the other 4 unused wires to transmit 12volts to the equiptment on the roof thus getting rid of the need for 2 wires.
Nov 1, 2008. 9:22 PMYerboogieman says:
i thought it was power from your cable internet box
Sep 5, 2008. 10:22 AMMaddio says:
I'm really green when it comes to being technically literate and this is the first site I have discovered like this. I love the concept so please excuse me if I don't communicate what I need to know correctly. But, I wonder if you would be kind enough to tell me did I need a wireless router in the following situation: I'm setting up my 1st ever home network because I have a desktop which only has USB ports (older that has no ethernet port) and a newer computer that has wireless. Purchased a wireless router so that both computers would have an IP connection through my cable modem which has both an ethernet and USB port. Talked to tech support of the manufacturer of the wireless router and was told that I also need to get a ethernet adapter. Not that I'm cheap or completely ignorant (computer challenged wise) but is there an alternative or are they just trying to sell yet another product they manufacture? I really think if this site is what it appears to be to me, that you all sharing the knowledge you have or have gained by communicating your insites to better one's understanding of a topic, by doing so your sharing a valuable asset which is knowledge! Let me know what you think. Thanks.
Feb 26, 2008. 8:19 AMspsteevoe says:
Great Instructable! any thought on pros/cons of wiring it to a +12v rail from your rig's PSU? That is my ultimate goal, but haven't been able to troll up any answers just yet...
Jul 9, 2008. 5:16 AMDerin says:
cat5 is rated to 30V each connector
Jul 18, 2008. 12:49 PMDerin says:
I say,I did not use wikipedia but I used the "check one thats laying around" method,it said 30V on it
Feb 16, 2008. 11:37 PMwestfw says:
Um. Real "Power over Ethernet" is a lot more complicated than this: 1) It doesn't provide power unless the "powered device" asks for it, to avoid zapping devices that only expect data on those pins. 2) It allows power and data to share the same wires/pins. 3) voltage is typically 48V (a standard telco voltage.) So this instructable tells you how to wire up a router to provide SOME power on the unused wires of ethernet cables, which may have some valid uses, but it's NOT really "PoE", and it won't be compatible with commercial products that expect to get their power over PoE. (grr. It's a real shame that real PoE is some complex and expensive (and not very energy efficient, either, since your central switches suddenly have to have supplies sufficient provide power for ALL possible ports whether or not anything is even plugged in.) A while ago I was looking for a low-cost PoE solution for smaller projects (say, a 3 watts module), and I couldn't find ANYTHING. (there's a fair amount near the top of PoE at 12+W.))
Jul 9, 2008. 5:15 AMDerin says:
hmmm,ethernet only reqs 4 pins while CAT5 has 8
Jul 9, 2008. 2:02 PMwestfw says:
Note that Gigabit ethernet uses all 8 pins...
Jul 9, 2008. 10:49 PMDerin says:
oh,I am caught off guard NO 10/100 ETHERNET!! JUST GIGABIT! now im all screwed up(jk)
Sep 2, 2008. 9:18 AMDerin says:
i was not doing it anyway
May 30, 2008. 12:44 AMsunset1 says:
<a rel="nofollow" href="http://www.l-com.com/item.aspx?id=9503&cmp=ALSOS">http://www.l-com.com/item.aspx?id=9503&cmp=ALSOS</a><br/>I dont know what you are looking for but I may have some other links. <br/>Hyperlink tech is one other place. I have possiblyone more place to send you if you need it. <br/>They used to have a bunch of poe stuff at great prices. <br/>sunset1<br/>
Feb 17, 2008. 9:59 AMTruegod says:
I don't think he is trying to power PoE compatible devices, just power the router.
Feb 20, 2008. 3:45 AMrichms says:
This is really handy to centralize the power adaptors for all your wireless accesspoints in one place. My accesspoints are all linksys wrt54g's and they are happy with anything from 5v up to at least 14 (came with a 12v adaptor) - so voltage drop isnt an issue, and higer voltages are better since the current will be lower so less voltage drop. Using a 5v one as you have means that there isnt a great deal of voltage drop before the thing will stop working. Most stuff works at 3.3v internally and your already pretty close to the low end of its regulation with a 5v adaptor and not much cable.
Feb 16, 2008. 8:44 PMGorillazMiko says:
Great job. Pretty cool, and yes, xtank5, read before you right, haha! :P

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