So, not sure if I’m making myself clear, but I recently just witnessed a female RJ45 jack need to be reterminated since it was only receiving PoE but not data. This is probably because the PoE pairs still function with connectors 1 to 8 reversed. We know this because our cable tester showed each conductor reversed with a reflector plugged in. As in, 1-8 should’ve mapped to 1-8 but instead mapped to 8-1. A coworker of mine pulled the head off and examined the pairs, but each color and stripe matched perfectly.

Not sure what happened here. I think it was probably human error since we encounter that sometimes when repairing work that cable contractors do. However, I could see myself making the same mistake since the pairs were all pushed in correctly.

  • slazer2au@lemmy.worldEnglish
    6·
    13 hours ago
    1. Because someone installed it wrong.

    I have done it many times. Brain on auto pilot mode up a radio tower terminating a dozen RJ45 and one is 8-1.

    1. Do you work in manufacturing? Because you may be messing with a rollover cable.
  • infinitevalence@discuss.onlineEnglish
    21·
    19 hours ago

    In the before times we would make something called a crossover cable to allow two network cards talk to each other without a switch or hub between them.

    • hodgepodgin@lemmy.zipOP
      6·
      19 hours ago

      my first thought, but it doesn’t really make sense since I’m not sure crossover is a completely reversed version of straight. Also this cable leads down to an actual patch panel.

      • Kristell@herbicide.fallcounty.omg.lol
        10·
        19 hours ago

        Yeah, a crossover cable is pins… 3 and 6 switched? iirc. I did not remember correctly, it’s 1/3 2/6, been a while. The greens and oranges swap places

        Either way, if the cable was reading completely reversed, assuming it wasn’t fixed by rewiring it, check the patch panel to make sure that’s wired right if you haven’t. One of the first mistakes I made in college was wiring a patch panel backwards xD

        Besides that the only thing I could assume is the direction one end got termed was just backwards. If someone’s in a rush I could see them just absentmindedly mounting the head backwards.