The ALF-21E-SOFTCODEC is a HDMI 2.0 2×1 Auto Presentation Switcher with CEC. The switcher is designed to switch HDMI inputs or USB-C input to a single HDMI output. The unit supports video resolutions up to 4Kx2K@60Hz 4:4:4 8bit, 1080P, and 3D. Additionally, there is a 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 analog audio output. The switcher 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, mouse etc. The switcher features multiple methods of control. When in the 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, also, it has CEC which allows the display device to be controlled.


Product Features:

  • 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, 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 analog 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 the corresponding HOST
  • Smart EDID management for various applications and customized settings
  • Front panel buttons trigger both CEC and RS232 commands for display control – ON, OFF, MUTE, VOL+, VOL -.


Video Input (1) HDMI, (1) USB-C
Video Input Connector (1) Type-A female HDMI, (1) 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) HDMI
Video Output Connector (1) 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) AUDIO OUT (Stereo balanced L/R)
Audio Output Connector (1) 5-pin terminal block
HDMI Audio Format LPCM 7.1 Audio, 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) EDID, (1) FW, (1) RS232, (1) HOST, (2) DEVICE
Control Connector (1) 4-pin DIP switch, (1) Micro-USB, (1) 3-pin terminal block, (1) Type-B USB 3.0, (2) 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



Technical Sheet

User Manual


1. Q – What is the ALF-21E-SOFTCODEC?

A – The ALF-21E-SOFTCODEC is a 2 x 1 Presentation Switcher

2. Q – How is the device controller

A – Via the front panel buttons and RS232. The device also allows control from the Host connection and HID devices via    the USB-A ports.

3. Q – Why are there different USB inputs on the ALF-21E-SOFTCODEC?

A – The USB B port is for Host connection (your PC) and the USB A are for peripheral devices such as a mouse, keyboard or camera.

4. Q – Will audio be de-embedded from the unit?

A – Yes, there is a balanced analog audio out on the unit.

5. Q – If the resolution on the display is not being output correctly, how do I resolve this?

A. Via the EDID DIP Switch, the manual will refer you to the resolution outputs for the EDID DIP Switch.