> > It would be interesting to see what the link partner sees. What does > > it think the I219-LM is advertising? Is it advertising 1000BaseT_Half? > > i219 parts come with LSI PHY. 1000BASE-T half-duplex is not supported. > 1000BASET half-duplex not advertised in IEEE 1000BASE-T Control Register 9.
That is the theory. But in practice? What does the link partner really see? I've come across systems which get advertisement wrong. However, in that case, i suspect it is the software above the PHY, not the PHY itself which was wrong. Andrew