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I've been playing around with several Arduino ethernet modules based on the ENC28J60 and the W5500 chipset. All modules are advertised as 10/100M, but in reality only work when the port of a switch is configured to handle 10M explicitly.

At this point in time that isn't a problem, however I'll be switching to new switches in the near future that can no longer handle 10M, having 100M as the slowest possible port speed.

How can I still connect my Arduino modules to these new switches (specifically Extreme Networks 5720-48MW)? Are there ethernet modules available that can connect to the 5720-48MW switches? And if so, how do I differentiate these modules, since all modules are advertised as 10/100M?

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  • Have you actually determined that your new switches will cause problems? Commented Apr 5, 2023 at 10:33
  • @StarCat Yes, this is a well known issue, not only limited to these Arduino modules. 10M devices will not work with switches that have speeds of 2.5GBit of higher. Commented Apr 6, 2023 at 9:47
  • I see now that the ENC28J60 is regularly advertised as supporting 10/100Mbps speeds but according to its datasheet it only supports 10Base-T (10Mbps). The WS5500 should be able to support 10/100 however, if properly implemented. Commented Apr 6, 2023 at 10:11

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