The Alfatron ALF-21E-SOFTCODEC is an HDMI 2.0 2×1 Auto Presentation Switcher with soft Codec and CEC. The ALF-21E-SOFTCODEC is designed to switch HDMI inputs or the USB-C input to one HDMI output. It supports video resolutions up to 4Kx2K@60Hz 4:4:4 8bit, 1080P, and 3D. Additionally, there is a smart built-in EDID setting that can be selected by the 4-pin DIP switch on the front panel. The switcher supports stereo and multichannel audio on the HDMI inputs. In addition to the audio embedded in the HDMI output stream, the audio is simultaneously de-embedded to a balanced analogue audio output.

It also supports device extension by providing one type-B USB port for host connection, and two type-A USB ports for HID devices such as a camera, microphone, keyboard etc. When in AUTO mode, the switcher will automatically switch to the first detected source device, when the active source is removed, the switcher will switch to the lowest numbered input. The switcher can be manually controlled by the front panel buttons and RS232 commands. It has CEC which allows the display device to be controlled.

  • 18G 2×1 switcher with HDMI and USB-C inputs
  • Supports automatic switching
  • Controllable via front panel buttons and RS232
  • Supports HDMI 2.0, 4Kx2K@60Hz 4:4:4, HDR 10, Dolby Vision, and HDCP 2.2
  • Provides charging on USB-C port up to 40W
  • Provides USB data (USB 3.0 / 2.0) and 4K video transmission on USB-C port
  • Balanced analogue audio for audio de-embedding
  • Peripheral units (e.g. microphone and camera) can be connected by type-A USB (USB 3.0 / 2.0) ports and automatically switched along with HDMI and USB-C input as USB DEVICES for corresponding HOST
  • Smart EDID management capable for various applications and customized setting
  • Front panel buttons trigger both CEC and RS232 commands for display control. (ON, OFF, MUTE, VOL+, VOL -)


Video Input 1 x HDMI, 1 x USB-C
Video Input Connector 1 x Type-A female HDMI, 1 x Type-C USB
HDMI Input Resolution Up to 4Kx2K@60Hz 4:4:4 8bit
USB-C Input Resolution Up to 4Kx2K@30Hz 4:4:4
Video Output 1 x HDMI
Video Output Connector 1 x Type-A female HDMI
HDMI Output Resolution Up to 4Kx2K@60Hz 4:4:4 8bit
HDMI Version 2.0
HDCP Version 2.2
USB Version 3.0
HDR 10 Supported
CEC Supported
HPD Supported
Audio Output 1 x AUDIO OUT (Stereo balanced L/R)
Audio Output Connector 1 x 5-pin terminal block
HDMI Audio Format LPCM 7.1 audio, Dolby Atmos®, Dolby® TrueHD, Dolby Digital® Plus, DTS: X™, and DTS-HD® Master Audio™ pass-through
Stereo balanced L/R audio Format PCM
Max Output Level 2.0Vrms ± 0.5dB. 2V = 16dB headroom above -10dBV (316mV) nominal consumer line level signal
THD+N <0.05% (-80dB), 20Hz ~ 20KHz bandwidth, 1KHz sine at 0dBFS level (or max level)
SNR >80dB, 20Hz ~ 20KHz bandwidth
Crosstalk Isolation >70dB, 10KHz sine at 0dBFS level (or max level before clipping)
L-R Level Deviation < 0.3dB, 1KHz sine at 0dBFS level (or max level before clipping)
Frequency Response Deviation <±0.5dB 20Hz ~ 20KHz
Output Load Capability 1KΩ and higher (supports 10x paralleled 10KΩ loads)
Stereo Channel Separation >70dB@1KHz
Control Part
Control 1 x EDID, 1 x FW, 1 x RS232, 1 x HOST, 1 x DEVICE
Control Connector 1 x 4-pin DIP switch, 1 x Micro-USB, 1 x 3-pin terminal block, 1 x Type-B USB 3.0, 1 x Type-A USB 3.0
HDMI 2.0 Cable Length 4K@60Hz 4:4:4 ≤ 5m, 4K@60Hz 4:2:0 ≤ 10m, 1080P ≤ 15m
Bandwidth 18Gbps
Operation Temperature -10℃ ~ +55℃
Storage Temperature -25℃ ~ +70℃
Relative Humility 10% ~ 90%
External Power Supply Input: AC 100 ~ 240V, 50/60Hz, Output: 24V DC 2.71A
Power Consumption 54W (Max)
Dimension (W*H*D) 168.0mm x 24.5mm x 95.0mm
Net Weight 245g


User Manual

Info Sheet