Joined: 07 Jun 2006 Posts: 980 Location: Coal Creek Canyon, Colorado
Posted: Sun Aug 12, 2007 16:44 Post subject:
I had posted a slightly different technique a year or two back -- what we do is jumper the power to the lan port closest to the power since we do it for outdoor client routers.
we use injectors like the ones on the dd-wrt shop.
I like Treb's splitter made from an inline connector -- I should try that.
I make splitters out of keystone jacks, which is pretty easy too. _________________ linksys GSv2, Gv4, Gv2, GLv1, G-TM, Buffalo wbr2, whr, whr-hp, whr-g125, wli-tx4-g54hp, Moto wr850gp, Alix.3C2
Joined: 01 Sep 2006 Posts: 92 Location: Netherlands, The Hague
Posted: Sun Aug 12, 2007 17:28 Post subject:
dicksons wrote:
I like Treb's splitter made from an inline connector -- I should try that.
Thanks but I didn't invent that, don't know who did though. Making a splitter/injector from an inline connector isn't very hard to do. It is however not for the faint hearted, since the colours of the wires inside the connector aren't universally the same or follow a standard colour coding. You've got to figure out the right coloured wires to be used for PoE yourself.
Here's the inside of my splitter. _________________ WRT54GL v1.1 @ 216MHz
2x HGA7T
DD-WRT v24 RC-5 (11/22/07) std nokaid
Joined: 28 Jun 2007 Posts: 87 Location: Ontario, Canada
Posted: Mon Aug 27, 2007 5:19 Post subject:
Wow this is amazingly cool! I was looking for POE solutions on the net and the cheapest I could find that I could use for any Linksys router (I have a WRT54G v3) is $60 CAD. This looks like a much cheaper way to do it though. And I learnt everything I need to know to do it last year in high school Computer Engineering. Thanks for posting!
Joined: 16 Mar 2007 Posts: 83 Location: Taipei,Taiwan
Posted: Mon Aug 27, 2007 13:01 Post subject:
matt0401 wrote:
Wow this is amazingly cool! I was looking for POE solutions on the net and the cheapest I could find that I could use for any Linksys router (I have a WRT54G v3) is $60 CAD. This looks like a much cheaper way to do it though. And I learnt everything I need to know to do it last year in high school Computer Engineering. Thanks for posting!
Joined: 28 Jun 2007 Posts: 87 Location: Ontario, Canada
Posted: Mon Aug 27, 2007 16:01 Post subject:
Now since there is still plenty of voltage available in short cable lengths, does that mean it's still possible and safe to run two PoE lines over one cat5 wire? What I mean is only using one of the twisted pairs for each run. (One wire for first positive, one wire for first negative... etc.)
Joined: 28 Jun 2007 Posts: 87 Location: Ontario, Canada
Posted: Mon Aug 27, 2007 16:09 Post subject:
I never really make my own cables and so I always use store-bought which never goes above 100' here. Do you think 100' would be too long to run power for two GL's? According to the OP's chart... "100ft actual router voltage = 11.0v". So I guess I should be okay. And does anybody have any idea how much power a WHR-HP-G54 uses? I'm planning on using these as my DD-WRT router of choice in the future.
Last edited by matt0401 on Mon Aug 27, 2007 16:10; edited 1 time in total
Joined: 07 Jun 2006 Posts: 980 Location: Coal Creek Canyon, Colorado
Posted: Mon Aug 27, 2007 16:09 Post subject:
you can use one of the nifty POE calculators for an estimate, but rule of thumb, using one pair rather than two for power to a device just about cuts your range in half.
on a linksys this probably won't be a problem if your under 100', but it sure should be easy enough to test. _________________ linksys GSv2, Gv4, Gv2, GLv1, G-TM, Buffalo wbr2, whr, whr-hp, whr-g125, wli-tx4-g54hp, Moto wr850gp, Alix.3C2
I think it's worth mentioning that the Buffalo products do not behave the same way when soldering a POE solution onto the board.
I recommend a two-piece POE injector/termination kit for Buffalo units that recent posts have referenced.
But here's the rub--The voltage drop over even a modest run (~10 meters) causes my Buffalo units to hang at boot. You need a new power supply for this to work correctly. _________________ DD-WRT<--Have you contributed to DD-WRT yet?
Joined: 28 Jun 2007 Posts: 87 Location: Ontario, Canada
Posted: Mon Aug 27, 2007 16:40 Post subject:
wygamail wrote:
I recommend a two-piece POE injector/termination kit for Buffalo units that recent posts have referenced.
But here's the rub--The voltage drop over even a modest run (~10 meters) causes my Buffalo units to hang at boot. You need a new power supply for this to work correctly.
I was planning on just using an injector/extractor cable if I were to use a Buffalo.
What do you mean by new power supply? And is getting one too expensive? I may not even bother with this with Buffalo routers if its not going to be stable.
EDIT: I bet the issue is with the amplifiers on the HP-G54's. They probably need a lot of voltage to feed them.
Joined: 01 Sep 2006 Posts: 92 Location: Netherlands, The Hague
Posted: Mon Aug 27, 2007 19:53 Post subject:
matt0401 wrote:
Now since there is still plenty of voltage available in short cable lengths, does that mean it's still possible and safe to run two PoE lines over one cat5 wire? What I mean is only using one of the twisted pairs for each run. (One wire for first positive, one wire for first negative... etc.)
If both devices are to be powered with the same power adapter why don't you make a daisy chain setup? Daisy chains for powering mutiple guitar effect are relatively cheap and come with the right connectors molded onto the cable.
I made my PoE injector and splitter from such a daisy chain, an Ibanez DC-3 to be precise.
I undertook a similar project about a year ago and had a lot of fun with it. I spent a while measuring the voltages over different lengths of network cable. It was surprised at how small the drop was. I concluded that in almost any residential setup, you don't have to worry about voltage drop because the Linksys power supply is so good.