As far as I understand the max. cable length applies to the length between devices (e.g. switches, repeaters etc.). Here I found the following citation:

For 10BASE-T, Clause Medium Attachment Unit (MAU) explicitly states "Provides for operating over 0 m to at least 100 m of twisted pair without the use of a repeater."

I'm not too familiar with repeaters in detail, but according to this a switch should work as well. So the following connection:

switch -> 5m stranded to patch panel -> 90m solid-core to next patch panel -> 5m stranded to switch

will have a length of 100m in total, so it's still within the specs, right? And if the max. lenght only applies to devices this should work:

switch1       <--100mTotal-->       switch2       <--100mTotal-->       switch3

switch -5m-> patch-90m-> patch-5m -> switch -5m-> patch -90m-> patch-5m -> switch
  • Your lengths are incorrect for the horizontal (maximum 90 meters) and patch cables (5 meters on each end). – Ron Maupin Aug 21 '20 at 15:47
  • See the answer to the above linked question. – Ron Maupin Aug 21 '20 at 15:47
  • By the way, there are many different ethernet standards, and the maximum cable lengths vary by standard. See this answer about different lengths for the different standards. – Ron Maupin Aug 21 '20 at 15:49
  • @RonMaupin I think I need to rephrase the question altogether. But I'll have a look at the links first. Meanwhile, aren't 90m +5m on each interchangeable with 98m +1m at each end? – Albin Aug 21 '20 at 16:01
  • No, that is explained in the linked answers. – Ron Maupin Aug 21 '20 at 16:02

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