how does auto-mdix work

I have an auto-sensing (not auto-negotiation) card that thinks its connected to a 10 mbps switch port. The switch port is actually configured for a fixed speed of 100 mbps. When I disabled auto-mdix on the port the card suddenly started linking at 100 mbps.

I was told that the auto-mdix used FLPs. This I imagine was confusing my auto-sensing card (please don't tell me to get a newer card, for various reasons that is not an option).

My question is how does auto-mdix actually work?

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Noah Davids
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