SDI Mixer Pro

I was just looking through the brochure for the SDI mixer pro and came up with a couple of questions...

A) Will it handle HD-SDI or just standard SDI?
B) If only standard def, any suggestions for something for HD-SDI?

We're going to be bumping up our Axons to 4 and we use the Decklink HD Capture cards. This would really help if I could use it with HD-SDI between the units.

Thanks!!!