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I recently checked my home network and noticed that one socket I had was accidentaly set up so it made a cross connection (with pins 3-1 and 2-6) being crossed.

I fixed my mistake but my network also worked fine before doing that. My Setup is basically

Router → Wall Socket (which was cross wired) → Switch -> PC

and before that

Router → Wall Socket → PC

Both configurations worked fine with the wall socket being wired regular or crossed. Now I'm curious why this wrong wiring did not cause any problems?

1 Answer 1

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Almost all modern network interfaces (both in devices and network equipment) automatically detect this condition and adapt. Crossover cables are all but obsolete.

This feature is called "Auto MDI-X".

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  • Thanks alot. I guess this is the same reason why switches don't use uplink ports anymore than? Man I got old :D Feb 25, 2021 at 11:30
  • We too got old. :) If not, we would not even understand your question most likely. ;)
    – LPChip
    Feb 25, 2021 at 13:55

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