Same Cat5 cable works on one laptop, but not another.

Discussion in 'Windows 10' started by donalgodon, Nov 25, 2016.

  1. donalgodon

    donalgodon MDL Member

    Jul 21, 2010
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    I have two laptops, same model, one my wife's and one mine, and I'm using a Gigabit Switch to extend my Cat5 length. One cable works fine in my wife's computer, but in mine, the cable won't give me network access.

    Any idea why?

    The port works fine with other cables in the past.
     
  2. T-S

    T-S MDL Guru

    Dec 14, 2012
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    Possible answers: the cable is crossed, one of the NICs has the auto commutation enabled te other no.

    Or just tolerances
     
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  3. donalgodon

    donalgodon MDL Member

    Jul 21, 2010
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    How can I check this?
     
  4. donalgodon

    donalgodon MDL Member

    Jul 21, 2010
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    It keeps polling/flashing but not connecting.
     
  5. Bezalel

    Bezalel MDL Member

    Apr 30, 2012
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    Is your computer limited to 100Mb? 100Mb uses two specific pairs for upload and download so if either pair is damaged it won't work. Gigabit can use any of the 4 pairs in either direction so as long as there are 2 undamaged pairs communication can occur (but at lower speeds).
     
  6. SpeedDream

    SpeedDream MDL Addicted

    Feb 20, 2012
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    failing network card?
     
  7. TrustMe

    TrustMe MDL Member

    May 2, 2013
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    I had the same problem with one of my laptops. If I plugged the cable directly into the laptop, I had no internet access. The only solution that worked for me was to place a RJ45 network coupling on the end of the cable and a network patch cable from the coupling to the laptop. After that the Internet worked.
     
  8. T-S

    T-S MDL Guru

    Dec 14, 2012
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    Just look at the plugs if the orange and green wires are in the same order your cable is straight, if they are swapped your cable is crossed.

    Just google for nice pictures
     
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  9. Hadron-Curious

    Hadron-Curious MDL Guru

    Jul 4, 2014
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    This thread should be moved to PC hardware section.
     
  10. pf100

    pf100 MDL Addicted

    Oct 22, 2010
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    I've gotten flaky cables to work sometimes by changing the ethernet settings to 10 mbps/half-duplex (as slow as it'll go). Your mileage may vary. Check your local laws. Contact your doctor immediately if you experience side effects or sudden death from slow ethernet speeds. Keep out of reach of children. This post has been formatted to fit your screen.
     
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