Patch Panel wiring configuration problem.

Posted on 2007-10-03
Last Modified: 2013-11-09
I'm confused, please help. I look after computers at a site and have little experience with cabling.

To test the connecton I used a simple transmitter which sends a single down each wire, you can see which wire by the lights on the top. The receiver also has the lights so you know which wire is receiving the signals.

I was testing the connection between a patch panel and a wall jack. I connected a Cat5 patch cable to a transmitter and plugged it into the patch panel. Then connected another Cat5 patch cable to a remote receiver and plugged it into the corresponding wall jack at the other end of the building.

The transmitter  was transmitting sequentially 1 through 8. I expected to see the same at the remote end. However the number order being received was 2, 1, 6, 5, 4, 3, 8, 7. My assumption was it had been wired incorrectly and would not work. However I plugged a computer into the wall jack, connected a switch with a server on it to the patch panel and everything worked fine.

Am I missing something???
Question by:nathankaa
    LVL 2

    Expert Comment

    you are not missing anything as long as all the lights light up irrespective of the order in which they appear except that your cable tester says it means something. by the way what cable tester are you using ?
    LVL 8

    Expert Comment

    What speed you are connected with if you are using 100 mbps then only two pairs are used. Pair 1,2 & 3,6 are used to transmit & recieve the signal. If other pairs open its not going to affect the communication.


    LVL 9

    Accepted Solution

    The cable could actually be terminated in a crossover style.  this being said, it would show the exact results that you mentioned and the computer would still work since the switch will auto mdx to allow either a strait or crossover cable.  Your pairs are correct just in reverse.  I would say you have nothing to worry about, but if you pulled the wall plate off it would probably be wired in a 568-a and the panel is 568-b or vice versa.  But if it works i would leave it alone.
    LVL 4

    Expert Comment

    Yes definately a crossover connection
    LVL 2

    Expert Comment

    I would just re-terminate the cables.  Cause a lot less problems in the future.  To me it does not sound like a crossover cable but a mis-terminated cable or a problem with your tester.
    LVL 9

    Expert Comment

    Thanks, for future reference, a strait though cable is terminated orange/white, orange, green/white, blue, blue/white, green, brown/white, brown on both ends.  A crossover will be the above on one end and green/white, green, orange/white, blue, blue/white, orange, brown/white, brown on the other end.
    Thanks and HTH

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