WIZnet Developer Forum

[Chip] W5500 does not support auto-MDIX

W5500 does not support auto-MDIX feature.
Thus, user should use straight-through cables to connect to other switches or routers and crossover cables to connect to devices such as servers, workstations or another W5500.

However, user can use either type of cable to connect to other devices with auto-MDIX enabled, and the interface automatically corrects for any incorrect cabling. Must work with your switch though, but you may try changing cables and try another switch to see if there will be a difference.

irina