|Originally posted by Michael Grant
HDMI cable equalization is a cooperative affair, I believe. Unless you have HDMI at both ends of the connection, you don't get the cable length benefit.
Sorry for the delay in responding. I was surprized by you comment, since I did not think pre-qualization would work well for DVI/HDMI, and I wanted to check into it so I could give an informed response.
It would take some fairly sophisticated design to warp the 1.65 GHz data-rate signal (max transition rate is of course half this) signals differentially to compensate for the lossy nature of the interconnect. I imagine it could be done of course, but don't imagine it is the most cost effective way to go.
After talking with Silicon Image - arguably the leader for HDMI - they confirm there is no cable pre-EQ in their transmitters, but that their HDMI receivers do have cable-equalization. So, at the least, HDMI inputs using Silicon Image chips will work with longer cables than DVI inputs.
So, my supposition about our DVI output driving an HDMI input getting the advantage of the better HDMI receiver and the longer cable length it supports appears to be correct.