DVI products allow digital signal's distribution and switching straight from the source to destinations.
Signals may be of the TMDS (Transition Minimized Differential Signaling) type and are shared also by the standard HDMI.
As a standard the DVI-I transmits on the usual DVI connector both digital and RGBHV signals and the DVI-D can transmit only digital ones.
DVIBOX-1 is a signal repeater suited for the standard DVI graphic interface.
DVIBOX-2 is a signal distributor/repeater suited for the standard DVI graphic interface.