DVI and RGB Cable Lengths
Some customers may want to run long enough DVI cable lengths between the ISHD and a projector to place them in different rooms. According to some manufacturers, 15ft (about 5 meters) is the max. Read further about it here:
http://www.audioholics.com/techtips/audioprinciples/interconnects/DVIHDMIconnections.php
You can search google for a list of DVI Distribution amplifiers.
For RGB, a length of about 3 meters is recommended before you need a distribution amp.