Amaya XT set up for 2 machines

I just bought 2 Amaya XT's. I have the software but can't figure out how they get plugged in. I know it sounds stupid????? But.... I see only 1 ethernet cord port in each of the machines. My old emc's had 2. Do they both get plugged into the computer or do they link from machine 1, to machine 2, to machine 3. Please help. I have just upgraded to these amayas and cant seem to figure it out. I figure I'd get a faster response here than calling Melco. :D