The recommended replacement is the Gefen EXT-DVIKVM-441DL.
The Gefen EXT-DVI-441DLS 4x1 DVI DL Switcher (Serial Control) allows you to easily switch between
four cross-platform dual link DVI computers using just one dual link DVI display,
USB 2.0 keyboard and mouse. Dual link DVI uses all 24 pins of the DVI connector
to achieve ultra high video resolutions up to 3840x2400. USB 2.0 is the next generation
of USB, capable of sending data significantly quicker than before. Video and control
signals are "switched" for each computer upon selection using either Discrete IR
Remote and either Discrete Contact Closure (RMT-4) or Serial RS-232, providing you with an easy and effective method of accessing two
computers from one workstation without the hassle of networking.
You simply connect your dual link DVI display and USB 2.0 keyboard/mouse to the
Switcher's outputs. Then you connect your computers' dual link DVI and USB ports
to the Switcher's inputs using the supplied cables. From there, you select the computer
you want using the IR remote that comes with the unit or with any RS-232 remote
control. It allows you to swtich seemlessly between Macintosh or PC keyboard/video/mouse
combinations.

Gefen EXT-DVI-441DLS Backside