Always surprised …, to be honest I’ve never heard about Auto-MDIX. I thought that this is important to remember which cable to use: straight-through or crossover. So automatic medium-dependent interface crossover (Auto-MDIX) is a feature that allows the switch interface to detect the required cable connection type (straight-through or crossover) and automatically configure the connection appropriately. With Auto-MDIX enabled, you can use either a straight-through or crossover type cable to connect to the other device, and the interface automatically corrects for any incorrect cabling. It works on 2940, 2970 and 3750 Series Switches.