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Can't have those nice pairs after all πŸ˜” (lemmy.world)
submitted 1 year ago by to c/iiiiiiitttttttttttt@programming.dev
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[–] 15 points 1 year ago (4 children)

Yeah, why is this the case? I have to refer to a diagram whenever I punch down a jack. Always forget where the green goes.

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  • [–] 10 points 1 year ago* (1 child)

    I sing a little ditty in my head:

    Orange-stripe, orange, green-strip, blue,

    Blue stripe, green, brown-stripe, brown.

    If it's the "other" scheme? Fuck me, to the diagrams I go.

    EDIT: Realized you're talking about jacks. Aren't they all clearly labelled these days, with both schemes?

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  • [–] 6 points 1 year ago (1 child)

    Yeah, the good ones are labeled, but I have a bag of unknown origin that don't have it on the side. I should probably just get a new bag.

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  • [–] 5 points 1 year ago (2 children)

    Blue in the middle is pair 1. Orange around that is pair 2. Green on the left, brown to the right.

    CC-B-AA-B-DD.

    Pair A is for telephone back when Ethernet was wired to a punch down block. Pair B and C are for data. Swap b and c on one end for crossover.

    The fourth pair is basically useless.

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    • [–] 6 points 1 year ago (2 children)

    Tab down, orange white, orange, green white, blue, blue white, green, brown white, brown.

    But in all honestly as long as the cables match on either end it doesn't matter even in the slightest what color they actually are so I never understood why they used such weird pairing either.

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  • [–] 6 points 1 year ago (1 child)

    It matters for longer runs and higher speed. The twist provides noise cancellation effect

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  • [–] 9 points 1 year ago* (1 child)

    It matters that you do the pairs right. CC-B-AA-B-DD. It doesn’t matter which color is which, except to make it easier to get the ends to match.

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  • [–] 3 points 1 year ago (1 child)

    I thought that you mean the color doesn't matter just that they match on the termination point, not as a pair. So you can have C with brown and green for example

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  • [–] 3 points 1 year ago (1 child)

    That you cannot do. Or at least you’ll have a lot of connectivity problems if you do.

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    • [–] 5 points 1 year ago

    When Metcalfe created Ethernet it was Thick Coax. Ethernet over twisted pair was standardized by TIA. They didn't fuck with it. They created it. Before that it was vendor specific.

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    [–] 4 points 1 year ago

    I don't know where they found it, but the WISP who ran Ethernet from the antenna to the router in my mom's house used white jackets for every wire pair.

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