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Atlona AT-OME-ST31A

3:1*2 HDMI / USB-C Swticher
2 x HDMI, 1 x USB-C inputs; 1 x HDMI, 1 x HDBaseT outputs; PoC, 4K / UHD

£699 (£838.80 inc. VAT)
Availability: In stock

Atlona AT-OME-ST31A Description

The Atlona AT-OME-ST31A is a 3x1 switcher and HDBaseT transmitter designed for remote powering, with HDMI and USB-C inputs. The OME-ST31A features two-channel audio de-embedding to an analogue balanced audio output. Part of the Omega Series of integration products for modern AV communications and collaboration, the OME-ST31A features mirrored HDMI and HDBaseT outputs and is HDCP 2.2 compliant. The USB-C input is ideal for AV interfacing with newer Mac®, Chromebook, and Windows® PCs, as well as smartphones and tablets. Video signals up to 4K/60 4:2:0, plus embedded audio, control, and Ethernet can be transmitted over HDBaseT up to 330 feet (100 meters). All inputs and the local HDMI output support 4K HDR and 4K/60 4:4:4 at HDMI data rates up to 18 Gbps. Additionally, 4K downscaling to 1080p @ 60, 30, or 24 Hz is available for the HDMI output when connected to an HD sink. The OME-ST31A is designed for use with Omega Series receivers and switchers, select HDVS Series receivers such as the AT-HDVS-SC-RX scaler, the AT-UHD-EX-100CE-RX receiver, and other Atlona switchers with HDBaseT inputs.

All-in-One Switcher, Controller, and Extender

This switching transmitter can serve as an integral component of a fully automated AV system, with the convenience of automatic input selection and display control. It can be remotely powered by Atlona HDBaseT-equipped devices. With the optional AT-PS-245-D4 power supply, the OME-ST31A can charge laptops and mobile devices through the USB-C port. For additional integration convenience, the OME-ST31A features TCP/IP and RS-232 control, RS-232 insertion over HDBaseT, and remote management with Atlona Management System (AMS).

Automatic Display Control

The OME-ST31A provides control to a display through TCP/IP, RS-232, or CEC*, without the need for a separate control system. This simplifies system design and integration while reducing costs. With automatic display control, the OME-ST31A can trigger a display to power on automatically whenever a laptop or other device is connected. At the end of the presentation, when the presenter disconnects the laptop, the OME-ST31A forces the display to power off. Ease of presenter interaction with the system, and the savings incurred by automatic display shutdown provide a significant return on investment. The OME-ST31A display control capability can also be triggered by an external control system. * Consumer Electronics Control (CEC): Atlona does not guarantee the function of CEC with all televisions. We can confirm proper operation with many current Samsung, Panasonic, Sony, and LG TVs. Many manufacturers do not support the CEC “off” command when sent from a source and older TVs use proprietary commands. Atlona only supports those TVs that follow CEC command structure from HDMI 1.2a and support the “off” command when issued by a source. We encourage any dealer to get evaluation product from Atlona prior to designing a system around this control technology or be prepared to use other methods to control their displays if Atlona CEC is not compatible with the installed displays.

Reliable Auto-Switching

The OME-ST31A automatically selects an input source based on detection of the 5 volt hot plug detect (HPD) signal, as well as active video. This ensures reliable auto-switching operation for all video sources, including DVRs, DisplayPort / Mini DisplayPort adapters, and other devices that always maintain the HPD line at the 5 volt “high” state but may not be delivering active video.


Complete system integration - The OME-ST31A and a compatible HDBaseT receiver provide a compact, yet comprehensive and cost-effective integration solution. When installed below a meeting table, the available Pocket 3H (AT-PKT-3H) provides convenient tabletop AV cable access for easy BYOD connectivity.Larger system applications - The OME-ST31A is ideal for extending AV connectivity from a central equipment rack to a meeting table or lectern, where presenters can easily access the system.Auditoriums and lecture halls - This switcher can be used for presenting 4K video content through the projector, while also optimising for a 1080p confidence monitor.
  • 3×1 HDBaseT switcher with HDMI and USB-C inputs
    • USB-C and two HDMI inputs
    • Immediate compatibility with laptops and tablets with USB-C ports supporting AV*
    • No need to provide USB-C to HDMI adapters
  • Mirrored HDBaseT and HDMI outputs
    • Local and long-distance video outputs provide flexible options for AV system designs and applications
  • Video, audio, power, and data over category cable utilizing HDBaseT technology
    • Transmits up to 330 feet (100 meters) @ 1080p with CAT5e/6 or 4K/UHD using CAT6a/7 cable
    • Uses easy-to-integrate category cable for low-cost, reliable system installation
  • 4K/UHD capability @ 60 Hz with 4:4:4 chroma sampling on local ports (HDMI and USB-C), plus support for HDR formats
    • HDBaseT output supports 4K/UHD @ 60 Hz with 4:2:0 chroma subsampling
    • HDMI and USB-C inputs, and HDMI output are compatible with 4K HDR10 @ 60 Hz and Dolby Vision™ @ 60 Hz, as well as HLG (Hybrid Log-Gamma) for 60p HDR broadcast services
  • HDCP 2.2 compliant
    • Adheres to latest specification for High-bandwidth Digital Content Protection*
    • Allows protected content stream to pass between authenticated devices
    • * HDBaseT receiver or switcher must also be HDCP 2.2 compliant.
  • Selectable 4K to 1080p downscaling
    • Integrated video processing available on the HDMI output for down-converting 4K/UHD @ 60 Hz to 1080p
    • Downscaling can be bypassed to allow pass-through up to 4K/60 4:4:4 and 4K HDR
    • Ideal for applications with 1080p displays, video conferencing codecs, and other HD sink devices
  • Remote powering over HDBaseT or local powering
    • Industry standard IEEE 802.3af PoE is supplied by an Atlona receiver or switcher over HDBaseT
    • Allows convenient switcher installation at a table or other remote location, without the need for local AC power
    • Also can be locally powered by the optional AT-PS-245-D4 power supply – to charge a USB-C mobile device
  • Automatic display control
    • Automatically changes display power state based on active or standby mode of the switcher. Control signals to display are transmitted via IP, RS-232, or CEC.
    • Enables display and volume control. CEC enables control of consumer displays (as supported by the display manufacturer).
    • Includes an adjustable lamp cooldown mode to avoid prematurely powering up a projector after shutdown
    • Eliminates the need for a complex AV control system
  • Automatic input selection using hot plug detect and video detection technology
    • Selects active input when sources are connected or if there is a change in source power status
    • Enables simplified, automatic system operation without user intervention
  • Audio de-embedding
    • De-embeds two-channel source audio into an analog balanced audio output
  • Multi-channel audio compliant
    • Passes through multi-channel audio formats from the HDMI or USB-C inputs
    • Supports PCM, Dolby® Digital, Dolby Digital Plus™, Dolby TrueHD, Dolby Atmos®, DTS® Digital Surround™, DTS-HD Master Audio™, and DTS:X®
  • EDID management
    • Manages EDID communications with the source through a display’s EDID or internally stored EDID
    • Ensures desired audio formats and video resolutions are provided to the AV system
  • HDCP management
    • Automatically reports HDCP compliance status to the source based on the sink device
    • Allows non-protected material from PCs to pass to non-compliant displays, streaming devices, and teleconference systems; protected content is not transmitted
    • Displays a green splash screen as visual confirmation that protected content is being blocked from transmission to a non-compliant display
  • Integrated HDBaseT link status monitoring
    • Tests integrity of the HDBaseT cable link between the transmitter and the receiver
    • Web GUI provides real-time link status
    • Quick, easy verification or troubleshooting of RJ-45 termination or twisted pair cable quality
  • Intuitive GUI-based configuration using integrated web server
    • Offers menu-based configuration of device settings including network access, input switching, signal processing, display control, HDCP and EDID management, and more
    • Allows fast configuration of internal product settings and troubleshooting from a mobile device or PC in the field
  • TCP/IP and RS-232 control
    • Flexible control options for compatibility with the Atlona Velocity™ control system, as well as other third-party control systems
    • Reduces integration time and costs
  • Easy to configure and manage with AMS (Atlona Management System)
    • Centralized, network-based configuration and management of Atlona IP-controllable products and systems
    • Manage configuration and firmware updates for AV devices spanning a facility, building, enterprise, or residence
    • Available as a cost-effective server appliance, or a free software download
  • Field-updatable firmware
    • Device can be updated in the field via AMS or the web GUI
    • USB port also available for firmware updates
  • Front panel power and signal status LEDs
    • LED indicators provide power, HDBaseT link, and input selection status information
    • Provides local, convenient setup and troubleshooting when network access is not available
  • Low-profile, 1.02 inch (26 mm) high enclosure
    • Easy installation into confined spaces below tables and in furniture

Atlona AT-OME-ST31A Specifications


HDMI Specification HDMI 2.0(1); HDCP 1.4, 2.2
UHD/HD/SD 4096x2160 (DCI) @ 60(1)/30/25/24Hz
3840x2160 (UHD) @ 60(1)/30/25/24 Hz
1080p @ 60/59.9/50/30/29.97/25/24/23.98 Hz
1080i @ 60/59.94/50 Hz720p @ 60/59.94/50 Hz
720x576p @ 50 Hz, 720x576i @ 50 Hz, 640x480p @ 60/59.96 Hz, 640x480i @ 60 Hz
VESA 2560x1600 @ 60 Hz, 2048x1536 @ 60 Hz, 1920x1200 @ 60 Hz, 1680x1050 @ 60 Hz, 1600x1200 @ 60 Hz, 1440x900 @ 60 Hz, 1400x1050 @ 60 Hz, 1280x1024 @ 60 Hz, 1280x800 @ 60 Hz, 1366x768 @ 60 Hz, 1360x768 @ 60 Hz, 1152x864 @ 60 Hz, 1024x768 @ 60 Hz, 800x600 @ 60 Hz, 640x480 @ 60 Hz
Scaler (HDMI Output)(2) 4K @ 24 Hz In -> 1080p @ 24 Hz Out
4K @ 30 Hz In -> 1080p @ 30 Hz Out
4K @ 60 Hz, 4:2:0 In -> 1080p @ 60 Hz (YUV/RGB, 4:4:4) Out
Scaler Pass-Through (HDMI Output) 4K @ 60 Hz / 4K @ 60 Hz
USB-C Up to 4K/UHD @ 60Hz
Color Space YUV, RGB
Chroma Subsampling 4:4:4, 4:2:2, 4:2:0
Color Depth 8-bit, 10-bit, 12-bit
HDR HDR10, Hybrid-Log Gamma (HLG), and Dolby Vision @ 60Hz; HDMI and USB-C ports only


Pass-Through Formats PCMLPCM 5.1LPCM 7.1
Dolby DigitalDolby Digital Plus Dolby TrueHDDolby Atmos DTS Digital Surround DTS-HD Master Audio and DTS:X
Sample Rate 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
Bit Rate 24 Mbits/s max

Analog Audio

Format 2-channel stereo
Balanced Output +4 dBu, nominal gain; +20 dBu headroom
Frequency Response 20 Hz to 20 kHz, ±0.5 dB
THD+N < 0.004% @ 20 Hz to 20 kHz
SNR > 105 dB @ 1 kHz, zero clipping @ 0 dBFS, unweighted


Supported HTTP, Telnet
Addressing DHCP, static
Authentication IEEE 802.1x: PEAP/MSCHAPv2 or EAP-TLS


RS-232 Device control and configuration; supports baud rates from 2400 to 115200
IP Device control and configuration
CEC Device control and configuration


HDMI IN 2 x Type A, 19-pin female
HDMI OUT 1 x Type A, 19-pin female
USB-C 1 x USB Type-C v3.1, 24-pin female
HDBaseT OUT 1 x RJ45
LAN 1 x RJ45, 10/100/1000 Mbps
RS-232 1 x 3-pin captive screw (bidirectional)
AUDIO OUT 1 x 5-pin captive screw, balanced/unbalanced, 2-channel
DC 24V 1 x 4-pin, locking


USB-C Device Charging Capability 60 W @ 20 V / 3 A, 36 W @ 12 V / 3 A, and 15 W @ 5 V / 3 A

Controls and Indicators

INPUT, DISPLAY 2 x momentary, tact-type
IP MODE, RESET 2 x momentary, tact-type, recessed
PWR indicator 1 x LED, green
LINK indicator 1 x LED, yellow
INPUT indicators: 1,2,3 3 x LED, green

Resolution / Distance

HDMI 4K/UHD -> 5m
1080p -> 10m
HDBaseT CAT5e 4K/UHD -> 90m
1080p -> 100m
HDBaseT CAT6/6a/7 4K/UHD -> 100m
1080p -> 100m


Maximum TMDS Clock 600 MHz (300 MHz over HDBaseT)
HDBaseT 10 Gbps


Consumption 101.5 W (with USB charging)24.2 W (without USB charging)
External Power Supply (optional)AT-PS-245-D4 Input: 110 - 220 V AC, 50/60 Hz
Output 24 V DC, 3 A
Safety FCC, RCM, cULus, CE, RoHS


Operating Temperature +32 to +113° F, 0 to +45° C
Storage Temerature -4 to +140°F-20 to +60°C
Operating Humidity (RH) 20% to 95%, non-condensing


Dimensions (H x W x D) 1.02 in x 8.62 in x 5.98 in
26 mm x 219 mm x 152 mm
Weight 1.95 lbs
0.88 kg
Safety CE, FCC, RoHS
In The Box AT-OME-ST31A, Installation guide, surface mounting hardware, and 2 meter (6.5 foot) USB-C male-to-male cable (USB 3.1 Gen 1)
Notes (1)4K/UHD p60 4:4:4 supported on input/output HDMI and USB-C input ports, 4K/UHD p60 4:2:0 is supported on HDBaseT output.
(2)Scaler does not support frame rate conversion.

Atlona AT-OME-ST31A Usage Diagram

Atlona AT-OME-ST31A Usage Diagram

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