Product title


One liner

A high performance dual-head IP KVM matrix solution with support for 5K video and multigigabit Ethernet connectivity.

Part of the ADDERLink INFINITY 4000 Series.

Product description

The ADDERLink® INFINITY 4021 (ALIF4021) is the world’s first dual-head, 5K high performance IP KVM matrix over a single fiber.

Fully compatible with the existing ADDERLink INFINITY (ALIF) range, and supported by the ADDERLink INFINITY Manager (AIM), the ALIF4000 can be used as a point-to-point extender or easily integrated into a wider matrix system.

  • Dual-head 5K video, digital audio and Hi-Speed USB2.0 over a single link
  • Supports up to 10-bit per colour SDR and HDR10
  • Pixel-perfect image quality
  • Multi-channel digital audio via DisplayPort™
  • Adder's USB True Emulation for fast switching
  • Backwards compatible with all the existing ALIF range
  • Flexible and scalable
  • Full touch screen control with floating launch icon and on screen keyboard

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Product specifications part 1
Video resolutions
  • Supports resolutions up to 5120x2880 including UHD or DCI and refresh rates up to 240Hz

  • Up to 10-bit per colour SDR and HDR10


  • Analog Line in/out 2 channel 16bit 48KHz 1V RMS in/1V RMS out
  • 2x DisplayPort™ Audio in either 2,6 or 8 channels linear PCM


  • 4 port of USB2.0 with Adder's USB True Emulation to support keyboard mouse and touch
  • One port of transparent Hi-Speed USB2.0
  • USB device seen as: 7 or 13 port hub


  • 2x 10,5,2.5 and 1GbE when using SFP-CATX-MR SFP
  • 2x 10GbE (no 10/100/1000 support on ber) via SFP
  • 2x 1GbE (no 10/100 support) via CATX ports


Local Unit - Transmitter (TX)

  • Computer: 2x DisplayPort™, 2x USB type B, 2x 3.5mm audio jack sockets, 1x DB9 socket
  • Ethernet: 2x 8p8c (RJ45), 2x SFP+ cages  
  • Power: 3 pin Kycon socket

Remote Unit - Receiver (RX)

  • Desk: 2x DisplayPort™, 5x USB type A, 2x 3.5mm audio jack sockets, 1x 3.5mm SPDIF socket
  • Ethernet: 2x 8p8c (RJ45), 2x SFP+ cages  
  • Power: 3 pin Kycon socket



  • (L)210mm/8.3" x (W)215mm/8.5" x (D)40mm/1.6"


  • Aluminum and steel construction


  • External power: 12VDC, 5A
  • Typical power consumption: 20W

Operating temperature

  • Operating temperature: 0 to 40oC/32 to 104oF
  • Storage temperature: 0 to 40oC/32 to 104oF
  • Storage and operating relative humidity: 10-90% non-condensing
  • Altitude: <2000m

Packing Box

  • Dimensions: (L)285mm/11.2" x (W)245mm/9.6" x (D)145mm/5.7"
  • Weight 2.5kg/5.5lb

Cable type recommendations

  • ALIF4021T 159,000 hrs
  • ALIF4021R 165,000 hrs
  • Telcordia SR332 Issue 4 March 2016 Calculated @55oC

Cable length rules

  • See manual

Cable type recommendations

  • See manual


  • CE and FCC: See the compliance web page for the full list
Product features part 1

Dual-head 5K screens over a single link
The ADDERLink® INFINITY 4021 (ALIF4021) can deliver two 5K screens over a single link

10-bit per colour and HDR10
Allows greater color depth, supports both SDR10 and HDR10

Multigigabit Ethernet support
Multirate (1/2.5/5/10) GbE support enables premium video performance over standard CAT6 cable up to 100m

Support for 1GbE
Integrated 1GbE ports enable easy delivery of 4K to 5K video over ubiquitous 1Gb/s copper links using 100m of standard CAT5e or CAT6 cable 

Enhanced resiliency
Dual-multirate or 1GbE ports can be teamed together for enhanced resiliency or improved video capability

Support for 5K resolutions
5K video resolutions supported for high resolution and ultra-wide video applications (5120x1440 @60Hz or 5120x2880 @30Hz)

High frame rate support
Refresh rates up to 240Hz supported for HD video resolutions

High speed USB2.0
Supports transparent USB communication up to 480Mbps for those using mass storage devices, mouse and keyboard, graphics tablets, jog shuttles, joysticks and 3D explorers

Perfect digital audio
Using the same encoding system as the other products in the ADDERLink INFINITY (ALIF) range, the digital video is spatially lossless, with 1:1 pixel mapping, ensuring that the digital video you receive is the same as the one leaving your remote computer
Backwards compatibility
The ALIF4000 can integrate seamlessly into your existing ADDERLink INFINITY® setup, replacing or working in conjunction with your existing ALIF endpoints

Isochronous Communication
Plug and play support for USB devices and third-party tools, such as Blackmagic Design DaVinci Resolve Color Grading Panels

Audio capability
Multi-channel digital audio, via DisplayPort™, provides a high-quality immersive sound experience.

Onboard diagnostics tool
Diagnostics tool maximizes uptime and assists with technical support enquiries by allowing the customer to troubleshoot network issues directly from the unit.

Flexible and scalable
Each ALIF4021 unit can be configured as a simple extender or distributed KVM switch. Each receiver can see up to 16 sources or can be connected to the ADDERLink INFINITY Manager (AIM) to create a larger and more fully featured matrix.

Product codes
Product brochures
What's in the box

ALIF4021R-XX: ALIF4021 Receiver

  • 1x PSU cable
  • 1x IEC cable

ALIF4021T-XX: ALIF4021 Transmitter

  • 2x 2m/6.5ft DisplayPort cable
  • 1x 2m/6.5ft USB cable.
  • 2x 2m/6.5ft Audio cables.
  • 1x PSU and IEC lead
Ordering information

ALIF4021T-XX: ALIF4021 Transmitter 

ALIF4021R-XX: ALIF4021 Receiver

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3 Unique Identifiers
  • Ext Distance: Unlimited over IP/100m over CATx/10km over fiber
  • Number of Screens: Up to 2
  • Resolutions: Supports resolutions up to 5120x2880 (5K) including UHD or DCI