Adder DDX-USR DVI, USB and audio digital over CATx User Station /KVM extender supports resolution up to 1920 x 1200 at 60Hz including 1080p. It can be used as a KVM extender when used with DDX-CAM-DP & DDX-CAM-DVI. However, when you introduce a DDX switch between them, suddenly you have the basis of an expandable switching matrix. Just add further DDX-CAM and DDX-USR modules for each new computer system and user. It uses a single CATx cable up to 50m. Data Sheet Manual