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Thread: Ethernet without RJ45 jack?

  1. #1
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    Ethernet without RJ45 jack?

    Would it be possible to connect a Teensy 4 to an Ethernet switch without the intermediate RJ45 jack + magnetics? I'm considering connecting a couple of them (each to its own switch port of course), and I would think that for 10..30 cm of cabling + magnetics on the switch side, perhaps the extra "stuff" could be avoided?

    Another way to ask is: could a Teensy 4 be wired up directly to a cable with an RJ45 plug on the end?

  2. #2
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    It wouldn't be ethernet compliant of course, but I suspect for short cable runs you could get away with it, until someone plugs the cable into a PoE sender that is.

  3. #3
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    Quote Originally Posted by MarkT View Post
    until someone plugs the cable into a PoE sender
    True, but that (and DC unbalance) could perhaps be solved with 0.1 F caps in series.
    There have been experiments with this approach, e.g. http://www.youritronics.com/magnetic-less-ethernet/.
    It would allow plugging a Teensy 4 into a spare Ethernet jack (plus power from USB).

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