Simple POE How To

Discussion in 'Modding Forum' started by zardiw, May 16, 2007.

  1. zardiw

    zardiw LI Guru Member

    Get 2 of these little ethernet cases, and some connectors at HomeDepot/Lowes/RadioShack.

    You need a piece of scrap Cat5 cable.

    Since you'll probably be making your own's pretty easy, you'll have extra Cat5 cable available.

    Cut the power cord so you have about a 6 inch long piece that will connect into the router.

    Strip the power cord leads long enough so you can shove them into both the blue/blue white, or brown/brown white slots. They bare copper will make a U shape as you can barely see in the pictures.

    I used Blue and Red Sharpies to color the ends of the connectors.

    You only need to join the 2 connectors with the orange, orange white, green and green white wires. The blue/blue white and brown/brown white are for the power to travel down the ethernet cable that plugs into the red connectors.

    These pictures, combined with some other POE info you can find with Google, is all you need:



  2. ifican

    ifican Network Guru Member

    Very well done for those that were ever curious. I always recommend that anyone that wants to play with this to use the brown/brown white as they are the 2 end wires and the easiest to keep straight.
  3. zardiw

    zardiw LI Guru Member

    It's better if you use brown + brown-white for the positive, and blue + blue-white for the negative (Cisco protocol), since if you use 2 wires on each leg, you will have less resistance, especially if you run it a long way. Easy to remember: blue is cool, i.e.

    I'm measuring about 1.6 ohms on a 40 foot run, fwiw

    Also, if you only link the 2 connectors with the 4 wires that actually carry data, you avoid putting power into the router.......some of them have weird circuitry attached to the blue/brown pair inside, from what I hear

    And SOME routers already have the power leads running on the inside , so make sure your polarity is right.

    FYI, on Linksys transformers anyway, the + side is the one with the dotted line.................z
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