Gefen 2x2 DVI DL Switcher



Recommended replacement: NTI SM-4X4-DVI-LCD
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The Gefen EXT-DVI-422DL is a 2x2 DVI Dual Link DVI Switcher which allows you to easily switch between two cross-platform extended desktop dual link DVI computers using just two dual link DVI displays, 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.  Video and control signals are "switched" for each computer upon selection using Discrete IR Remote and Discrete Contact Closure RMT-2x2 (sold separately), providing you with an easy and effective method of accessing two computers from one workstation without the hassle of networking.

Gefen DVI Dual Link Switch Backside
Gefen DVI Dual Link Switch Backside

How the Gefen DVI DL Switcher works:

Connect your dual link DVI displays 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. It allows you to switch seamlessly between Macintosh or PC keyboard/video/mouse combinations.

Note: Wired switching is also available via Parallel Discrete Contact Closure

Gefen EXT-DVI-422DL Features:

  • Switches easily between any four dual link DVI computers with USB 2.0
  • Maintains highest 3840 x 2400 resolution dual link video
  • Saves you money on hardware costs
  • Use either PC or Mac USB 2.0 keyboard/mouse
  • Discrete IR remote (included)
  • Contact closure remote control option, RMT-4 (sold separately)
  • Auto equalization for optimal picture quality
  • Supports resolutions up to 1080p, 2K, and 3840 x 2400
  • Supports DDWG standards for DVI monitors
  • Installs in minutes
  • Rackmountable

Gefen EXT-DVI-422DL Package Includes:

  • 2x2 DVI DL Switcher
  • RMT-2IR IR remote
  • (1) 5V Power Supply
  • (4) 6ft Dual Link DVI cables
  • (2) 6ft USB 2.0 Cables
  • User's Manual
  • Rack Ears

Gefen EXT-DVI-422DL Specifications:

Height 1.75 in. (4.45 cm.)
Width 17 in. (43 cm.)
Depth 4.375 in. (11.112 cm.)
Rack Space 1U
Shipping Weight 8 lbs. (4 kg.)
Supply 5V DC
Consumption 20 watts (max)
Input Signal  
Video 1.2 volts p-p
DDC 5 volts p-p (TTL)
DVI DVI-I 29 pin female (digital only)
Audio mini-phone stereo 3.5mm
USB 2.0 Input Type "B"
USB 2.0 Output Type "A"
Video Amplifier Bandwidth 2 x 1.65 Gbps
Dual Link Range 3840 x 2400
Question: Have there been any firmware updates released for EXT-DVI-422DL?
Answer: Thank you for your inquiry. According to our Gefen contact, there are no firmware updates available or planned for this unit.

Question: Audio is not coming to the output ?
Answer: Thank you for your inquiry. Unfortunately, due to the complex and varied nature of user environments, detailed product support is beyond the scope of this simple FAQ.

That being said a couple things to try would be to ensure that all cables are fully seated and receiving the need power. Also, ensure the audio cables and equipment work without the switcher by attaching the components directly to a device to see if they work. It may also be helpful to ensure the switcher and attached devices support the correct audio formats.

One potential source for troubleshooting / support help would be the manufacture's forum located here:

Question: How do i rebbot the unit, Because audio inputs and outsputs are not working?
Answer: Thank you for your inquiry. Unfortunately, we could not locate a reboot procedure in the manual:

Our best guess would be to power down, unhook the systems, let the unit rest for a few minutes, then follow the steps to reconnect the unit.