HDMI, HDBaseT, AT-UHD-CLSO-824, 4K/UHD, multi-format switcher, multi-format matrix switcher

4K/UHD 8×2 Multi-Format Matrix Switcher with Dual, HDBaseT and Mirrored HDMI Outputs

Model Number: AT-UHD-CLSO-824

  • 8×2 matrix switcher with HDBaseT and HDMI ports for each output
  • Three Ethernet-enabled HDBaseT inputs
  • Four HDMI inputs
  • One multi-function analog input on 15-pin HD connector
  • Two Ethernet-enabled, HDBaseT outputs
  • Audio output matrix mixer
  • Two, balanced, stereo audio outputs on 6-pin captive screw connectors
work_with_ams featured_solution2

4K/UHD 8×2 Matrix with HDBaseT and HDMI Outputs


4K/UHD 8x2 Matrix with HDBaseT and HDMI Outputs

The AT-UHD-CLSO-824 is a 4K/UHD 8×2 matrix switcher with dual, HDBaseT and mirrored HDMI outputs for 4K/UHD @ 60Hz signals. This matrix switcher has multi-format signal-handling, Ethernet-enabled 100-meter HDBaseT™ input/output extension, and advanced audio capabilities.

Presentation Matrix Switcher

The AT-UHD-CLSO-824 brings advanced multi-format matrix switching to the CLSO series of classroom and small office switchers. The mix of inputs supports remote sources at lecterns and conference room tables via HDBaseT transmission as well as local sources in the equipment rack. The matrix serves a wide array of room configurations with two HDBaseT video outputs, each featuring a mirrored HDMI port to provide an additional output for a local display or an Atlona Extender Kit.

100-meter HDBaseT Routing

The AT-UHD-CLSO-824 offers three Ethernet-enabled HDBaseT inputs designed to provide system design flexibility. To increase the number of system inputs, designers can choose the AT-HDVS-200-TX or AT-HDVS-200-TX-WP HDBaseT transmitter that offers HDMI and VGA inputs with Ethernet. The switcher is also compatible with the UHD-EX Series of HDBaseT extenders for HDMI signals with or without control signals. Two HDBaseT outputs on the switcher provide extended distance AV signal extension up to 328 feet (100 m). These outputs are Ethernet-enabled to also provide extension of control signals to displays. All HDBaseT inputs and outputs feature industry standard Power over Ethernet to remotely power extender endpoints.


Sophisticated matrixing capabilities within the switcher include a dedicated audio mix-matrix for signals routed to the switcher’s outputs. This gives integrators the ability to mix audio signals from either of the two selected video sources along with both mic/line input signals. Audio is de-embedded from the video signal for processing and mixing with the mic/line sources. The resulting audio mix is sent to the balanced line level analog outputs and re-embedded to the digital video outputs.

The CLSO for complex systems

The AT-UHD-CLSO-824 serves as the centerpiece of complex systems where audio and video signals must be dedicated to different zones. It also provides the flexibility to route identical or separate video signals to the two displays in larger rooms.

The AT-UHD-CLSO-824 is ideal for use in:

  • Dual-screen classrooms, conference rooms, or training environments
  • Divisible rooms with one screen per room
  • Single-screen teleconference systems where content is required at the codec

The following Atlona HDBaseT transmitters and receivers are recommended for use with the AT-UHD-CLSO-824.

HDBaseT Transmitters HDBaseT Receivers


4K/UHD Remote Powered HDMI Over 100M HDBaseT Transmitter with Ethernet, Control and PoE


4K/UHD HDMI Over 100M HDBaseT Receiver with Ethernet, Control and PoE


Three-Input Switcher for HDMI and VGA Sources with Ethernet-Enabled HDBaseT Output


Ethernet-Enabled HDBaseT Scaler with HDMI and Analog Audio Outputs


Two-Input Wall Plate Switcher for HDMI and VGA Sources with Ethernet-Enabled HDBaseT Output


A complete list of compatible transmitters and receivers is available in the Related Products tab.

Configured and Managed by AMS

The AT-UHD-CLSO-824 also supports the Atlona Management System (AMS), a powerful network software platform that integrates product configuration, management and updating. Specially designed for IP-controllable Atlona Products, the Atlona Management System reduces installation time and enables remote monitoring and support. To learn more please visit AT-SW-AMS.


8×2 matrix switcher with HDBaseT and HDMI ports for each output

  • Eight different sources may be switched to either of two outputs with mirrored HDBaseT/HDMI signals
  • Serves a wide array of room configurations

Three HDBaseT inputs

  • Works with Atlona AT-HDVS-150 or AT-HDVS-200 transmitters for placement at remote sources near lecterns, conference tables, and instructor’s desks
  • Simplifies integration of remote sources by eliminating power supplies when used with PoE-powered transmitters; single category cable carries AV signals, control and power

Four HDMI inputs

  • Digital inputs to support up to four HDMI sources or DisplayPort and DVI sources with appropriate adapters
  • Ideal for sources located at the equipment rack

One multi-function analog input on 15-pin HD connector

  • Accepts RGBHV and component signals using common adaptors and break out cables
  • Provides input options for legacy analog sources

Two Ethernet enabled, HDBaseT outputs

  • Extends control signals from third party control processors via HDBaseT along with 4K/UHD video, and audio through a single cable with 328 ft. (100 m) performance
  • Network connections simplify control system design; eliminates multiple cable runs between source, control system router and display

Audio output matrix mixer

  • Mixes de-embedded digital audio along with analog mic/line level inputs and routes to analog outputs or re-embed to video outputs
  • Eliminates the need for complex external audio routing systems

Two, balanced, stereo audio outputs on 6-pin captive screw connectors

  • Maintains proper audio gain structure between commercial line level devices; eliminates adaptors
  • Designed for use with analog commercial sound systems

Mirrored outputs on HDBaseT and HDMI

  • Each matrix output supports dual display applications for a local display and extended distance displays up to 328 feet (100 meters)
  • Eliminates cost associated with extra extension components; simplifies installation. HDMI output allows additional HDBaseT transmitter for dual, long distance applications

4K/UHD @ 60 Hz capability

  • Compatible with Ultra High Definition sources and displays  up to 4K @ 60 Hz with 4:2:0 color subsampling
  • Supports high resolution applications such as CAD, desktop publishing, and detailed financial reporting

Power over Ethernet for remote-powered HDBaseT receivers

  • Industry standard IEEE 802.3af PoE supplied by the switcher over HDBaseT
  • No local AC outlet required saves time and integration costs

TCP/IP, RS-232, and IR, control

  • Compatibility with third-party control systems provides flexible control options
  • Reduces integration time and costs

EDID management

  • Manages EDID communications between source and switcher; allows integrators to force sources to preferred resolution
  • Ensures desired audio formats and video resolutions are provided to the AV system; eliminates the need for EDID management device

HDCP Management

  • Allows non-protected material from PCs to pass to non-compliant displays and teleconference systems while protected content is not transmitted
  • HDCP compliance can be switched on/off from control systems for use with non-compliant displays, streaming devices, and codecs

Two, balanced line/mic input with 48V phantom power

  • Provides professional audio input for wired and wireless microphones
  • Saves installation costs by eliminating external audio mixer

Microphone ducking with advanced controls

  • Automatically reduces program audio levels when mic is used
  • Ensures optimized voice-over performance

Audio de-embedding

  • De-embeds PCM audio from HDMI inputs to audio out matrix
  • Provides audio signal routing to sound system

Adjustable Volume and EQ

  • Features independent gain control for each input, master audio level controls 5 band EQ adjustment
  • Optimizes audio signals eliminating the need for an external mixer

Front panel volume and mute controls

  • Volume Up and Volume Down through menu to adjust output level to sound system
  • Provides quick level adjustment for operators

Easy, GUI-based configuration using integrated web server

  • Offers menu-based configuration of network settings, RS-232 settings, input switching, EDID and HDCP management and audio
  • Allows fast configuration of internal product settings and troubleshooting from a tablet, smart phone or PC in the field

IP to RS-232 translation

  • Converts TCP/IP commands to RS-232 commands for output to external devices
  • Enables single IP connection to control processor to control both IP and RS-232 connected devices. Faster installation

Ten RS-232 ports

  • Multiple, bidirectional, RS-232 ports to control other devices in the system
  • Reduces cost associated with complex control processors

Ethernet, RS-232 and IR HDBaseT insertion

  • Adds control signals to the HDBaseT transmission including Ethernet, RS-232 and bi-directional IR
  • Simplifies display control from third-party control systems

Multi-channel audio compliant

  • Supports PCM, Dolby® Digital, Dolby Digital Plus™, Dolby TrueHD, Dolby Atmos®, DTS Digital Surround™, and DTS-HD Master Audio™ in pass through mode
  • Allows any two-channel audio stream to be used within a professional audio system

Rack mountable 1U, full-rack width enclosure

  • Installs easily in rack mounted systems with included 19” rack and wall mount brackets
  • Reduces installation time and cost

Included accessories

  • User guide, desktop power supply with, detachable power cable, IR hand held remote control, and rack mount bracket kit



Atlona’s NEW CLSO-824 Multi-Format Presentation Matrix Switcher

Video 4096×2160@24/25/30/50*/60Hz*, 3840×2160@24/25/30/50*/60Hz*, 2048x1080p,
1080p@23.98/24/25/29.97/30/50/59.94/60Hz, 1080i@50/59.94/60Hz, 720p@50/59.94/60Hz, 576p, 576i, 480p, 480i
VESA 2560×2048, 2560×1600, 2048×1536, 1920×1200, 1680×1050, 1600×1200, 1600×900, 1440×900, 1400×1050, 1366×768, 1360×768, 1280×1024, 1280×800 1280×768, 1152×768, 1024×768, 800×600, 640×480
Colorspace YUV, RGB
Chroma Subsampling 4:4:4, 4:2:2, 4:2:0
Color depth 8-bit, 10-bit, 12-bit
Analog Output PCM 2Ch (de-embedded)
HDMI IN/OUT PCM 2Ch, LPCM 5.1, LPCM 7.1, Dolby Digital, DTS 5.1, Dolby Digital+, Dolby TrueHD, DTS-HD Master Audio
Sample Rate 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
Bit Rate up to 24-bit
CAT5e/6 @ 4K up to 70 meters up to 230 feet
CAT5e/6 @ 1080p up to 100 meters up to 328 feet
CAT6a/7 @ 4K up to 100 meters up to 328 feet
HDMI IN/OUT @ 4K up to 5 meters up to 15 feet
HDMI IN/OUT @ 1080p up to 10 meters up to 30 feet
Bandwidth 10.2 Gbps
HDCP Switchable – Compliant/Non compliant
Operating 0°C to 50°C 32°F to 122°F
Storage -20°C to 60°C -4°F to 140°F
Humidity 20 to 90% non-condensing
Consumption 78.54W
Idle Consumption 3.52W
Supply Input: AC100~240 VAC 50/60Hz
Output: 48 VDC 3.125A
H x W x D 44 x 433.8 x 255 (mm) 1.73 x 17.08 x 10.04 (inch)
w/feet 55.15 x 433.8 x 255 (mm) 2.17 x 17.08 x 10.04 (inch)
Rack Unit 1U
Unit 3.49kg 7.69lbs
Power Supply CE, FCC, cULus, CCC, RCM
Unit CE, FCC

*4096×2160@50/60Hz & 3840×2160@50/60Hz supported @ chroma subsampling 4:2:0 8-bit only

AT-UHD-CLSO-824 Application


pdf-icon Datasheet
pdf-icon Manual V.6 (12/2016)
pdf-icon Tech Tips
pdf-icon Product Engineering Document

Diagrams, Drawings & CAD Files

cad-icon-(1) CAD Files

Declarations Of Conformity

pdf-icon Declarations Of Conformity

Related Products

The AT-UHD-CLSO-824 can be used with the Atlona UHD-EX Series HDBaseT transmitters and receivers.

AT-UHD-EX-100CE-TX-PD 4K/UHD Remote Powered HDMI Over 100M HDBaseT Transmitter with Ethernet, Control and PoE
AT-UHD-EX-100CE-TX 4K/UHD HDMI Over 100M HDBaseT Transmitter with Ethernet, Control and PoE
AT-UHD-EX-100CE-RX 4K/UHD HDMI Over 100M HDBaseT Receiver with Ethernet, Control and PoE
AT-UHD-EX-100CE-KIT 4K/UHD HDMI Over 100M HDBaseT TX/RX with Ethernet, Control and PoE
AT-UHD-EX-70C-TX 4K/UHD HDMI Over HDBaseT Transmitter with Control and PoE
AT-UHD-EX-70C-RX 4K/UHD HDMI Over HDBaseT Receiver with Control and PoE
AT-UHD-EX-70C-KIT 4K/UHD HDMI Over HDBaseT TX/RX with Control and PoE

The AT-UHD-CLSO-824 can be used with the Atlona HDVS Series HDBaseT switching transmitters and scaling receivers.

AT-HDVS-200-TX Three-Input Switcher for HDMI and VGA Sources with Ethernet-Enabled HDBaseT Output
AT-HDVS-200-TX-WP Two-Input Wall Plate Switcher for HDMI and VGA Sources with Ethernet-Enabled HDBaseT Output
AT-HDVS-200-RX Ethernet-Enabled HDBaseT Scaler with HDMI and Analog Audio Outputs

Similar Products

AT-UHD-CLSO-601 4K/UHD Six-Input Multi-Format Switcher with Mirrored HDMI and HDBaseT Outputs
AT-UHD-CLSO-612ED 4K/UHD Six-Input Multi-Format Switcher with Mirrored HDMI and HDBaseT Outputs
AT-UHD-CLSO-840 4K/UHD 8×4 HDBaseT and HDMI Matrix Switcher with PoE
AT-UHD-PRO3-44M 4K/UHD Dual-Distance 4×4 HDMI to HDBaseT Matrix Switcher with PoE
AT-UHD-PRO3-66M 4K/UHD Dual-Distance 6×6 HDMI to HDBaseT Matrix Switcher with PoE
AT-UHD-PRO3-88M 4K/UHD Dual-Distance 8×8 HDMI to HDBaseT Matrix Switcher with PoE
AT-UHD-PRO3-1616M 4K/UHD Dual-Distance 16×16 HDMI to HDBaseT Matrix Switcher with PoE

AT-UHD-CLSO-824 Firmware

Firmware Version 1.0.28
Revision D
File Size 1.02 MB
Date 12.01.16

Update includes:

  • Added the ability to switch between DHCP and static IP through the front panel
  • Added CLI debug command
  • Improved compatibility with AT-HDVS-200-TX
  • VGA audio no longer incorrectly mixes with input audio when Auto Follow Other Video (AFOV) is selected
  • See included release notes for more…

Note: Atlona strongly recommends firmware updates using the Atlona Management System (AMS) or the unit’s web GUI. Firmware can also be updated via USB from a PC with Windows 7, or a Mac running Windows 7 in Bootcamp.

AMS allows management and automation of firmware updates for multiple Atlona IP-controllable products in an AV installation. With AMS, you can push new firmware to several devices at once, and also schedule updates at a convenient date and time.

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