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   LisPi (lispi314@udongein.xyz)'s status on Thursday, 20-Feb-2025 12:28:23 JST LisPi
   @agowa338 What do Ethernet switches do to mitigate the different-ground issue anyway?
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     Rich Felker (dalias@hachyderm.io)'s status on Thursday, 20-Feb-2025 12:28:20 JST Rich Felker

     in reply to

     @lispi314 It all has to be isolated. Transformers aren't DC-DC because Ethernet isn't DC. It's very high frequency, thereby AC.

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     LisPi (lispi314@udongein.xyz)'s status on Thursday, 20-Feb-2025 12:28:22 JST LisPi

     in reply to
     Some articles seem to suggest there's DC-DC transformers involved.
     
     This raises the question though: What about shielded ethernet with a ground wire?
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     Rich Felker (dalias@hachyderm.io)'s status on Thursday, 20-Feb-2025 12:43:08 JST Rich Felker

     in reply to

     @lispi314 No, ideal theoretical DC is eternally on and constant magnitude, but to behave DC like it at least has to have no short time scale variations.

     Any signal on computing scales is AC. It might have a DC bias but the signal part is AC.

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     LisPi (lispi314@udongein.xyz)'s status on Thursday, 20-Feb-2025 12:43:09 JST LisPi

     in reply to

     • Rich Felker
     @dalias Doesn't AC imply polarity changes and most Ethernet equipment has diodes preventing such reversed flow?
     
     Very choppy DC is still DC.