Bonsoir Rich,
Sorry, I don't explain correctly.
Suppose I connect a MDI to a MDI-X through a crossover cable instead of a straight cable. We have an emitter face to an emitter, and a receiver face to a receiver. In this case, it's not a polarity issue, but a question of pair inversion.
It's the same thing if we connect a MDI to a MDI through a straight cable. I heard that some devices detect that and try to invert the pairs. Have you seen that?
Regards, Michelot