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DIY POE 8 port switch

Discussion in 'General Electronics Discussion' started by StealthRT, Aug 7, 2012.

  1. StealthRT

    StealthRT

    129
    2
    Sep 4, 2010
    Hey all i am trying to modify a Netgear GS108 8-Port gigabit switch with POE on 4 of the ports. Problem is that when i go to test to find out what pins 4/5 and 7/8 are in order to place the positive and negative terminals too, it shows continuity on every pin of echo of the 8!

    So in other words, no matter what pin i test for, it always shows continuity so i never know what pin is not being used!

    Here is a picture of the board:
    [​IMG]
    [​IMG]

    Any help would be greatly appreciated since i do not want to fry it :eek:)
     
    Last edited: Aug 7, 2012
  2. StealthRT

    StealthRT

    129
    2
    Sep 4, 2010
    Hum it would seem that gigabit switches use all 4 pairs of wires :/

    Oh well.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,689
    Jan 21, 2010
    Yep, sure do. Sorry, I didn't spot that when I read it at first.

    However, gigabit LAN is backward compatible with 100baseT, so you can connect a cable using only the 2 pairs used for that and use the other 2 pairs for POE.

    You will require an adapter at one end, and possibly at the other, and clearly your speeds will be limited to 100Mb/s
     
  4. StealthRT

    StealthRT

    129
    2
    Sep 4, 2010
    If i were to connect pins 4/5 (positive) and 7/8 (negative) to the first 6 ports (ports 1-6) i understand that they would be forced to use 10/100mbps instead of 10/100/1000mbps. That being said, would the other 2 ports (7 & 8) be forced to use 10/100mbps as well or would they operate at the normal 10/100/1000mbps?
     
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