Atlona Omega 4K/UHD 3-Channel HDMI/USB-C Switcher and HDBaseT Transmitter - AT-OME-ST31A

Product Overview

The Atlona AT-OME-ST31A (SKU: AT-OME-ST31A) is a compact 3×1 HDBaseT switcher and transmitter designed for professional conference rooms, lecture halls, and collaboration spaces that require native USB-C and HDMI switching alongside long-distance AV extension. This Omega Series HDBaseT transmitter with USB-C input accepts one USB-C and two HDMI sources, delivers mirrored HDBaseT and HDMI outputs, and supports 4K/UHD video at up to 60 Hz with 4:4:4 chroma sampling on its local ports. AV integrators specifying a 4K USB-C HDMI HDBaseT switcher will benefit from its remote PoE powering capability, automatic display control, and audio de-embedding — all without requiring a separate control system.

Product Description

The Atlona AT-OME-ST31A is a 3×1 switcher and HDBaseT transmitter that forms the presenter-side half of a complete AV extension system. Part of the Omega Series, it features one USB-C input and two HDMI inputs, making it directly compatible with modern Mac, Chromebook, and Windows PCs without requiring USB-C to HDMI adapters. The local HDMI and USB-C ports support 4K/UHD at 60 Hz with 4:4:4 chroma sampling, HDR10, Dolby Vision, and HLG; the HDBaseT output supports 4K/UHD at 60 Hz with 4:2:0 chroma subsampling. Video, audio, Ethernet, and control signals are transmitted over a single category cable up to 330 feet (100 meters) using CAT6/6a/7, or up to 295 feet (90 meters) using CAT5e. The mirrored HDMI output includes selectable 4K-to-1080p downscaling, ideal for dual-display environments pairing a 4K projector with a 1080p confidence monitor. The unit is designed for remote powering via IEEE 802.3af PoE supplied by a compatible Atlona HDBaseT receiver or switcher, enabling installation under meeting tables or inside lecterns without a local power outlet. With the optional AT-PS-245-D4 power supply, the USB-C port can charge laptops and mobile devices up to 60 watts. Audio de-embedding routes two-channel PCM audio to a balanced analog output for direct connection to an amplifier. Automatic input selection uses hot plug detect and active video detection to switch sources hands-free, while automatic display control via IP, RS-232, or CEC eliminates the need for a separate control system. A built-in web server provides intuitive GUI-based configuration, EDID management, HDCP management, and HDBaseT link status monitoring. The AT-OME-ST31A is supported by Atlona Velocity Device Manager for centralized network-based device management.

Key Features

• 3×1 Switcher: One USB-C and Two HDMI Inputs — Native USB-C AV input supports modern laptops and tablets without adapters; two HDMI inputs cover standard presentation sources.
• 4K/UHD @ 60 Hz with 4:4:4 on Local Ports — HDMI and USB-C ports support 4K/60 4:4:4, HDR10, Dolby Vision, and HLG at up to 18 Gbps HDMI data rates.
• Mirrored HDBaseT and HDMI Outputs — Simultaneous local HDMI and long-distance HDBaseT outputs provide flexibility for diverse display configurations.
• Selectable 4K-to-1080p Downscaling on HDMI Output — Integrated scaler converts 4K/UHD sources to 1080p for 1080p confidence monitors, HD codecs, or other HD sink devices.
• Remote PoE Powering over HDBaseT — IEEE 802.3af PoE from a compatible receiver powers the transmitter over the HDBaseT cable, eliminating the need for local AC power.
• HDBaseT Extension up to 330 Feet (100 Meters) — Transmits 4K/UHD video, audio, Ethernet, and control up to 330 ft over CAT6/6a/7; 295 ft over CAT5e.
• Automatic Input Selection — Hot plug detect and active video detection enable reliable, hands-free source switching for all video sources including those that hold HPD high.
• Automatic Display Control — Powers displays on/off via IP, RS-232, or CEC based on source activity; includes projector lamp cooldown mode to prevent premature cycling.
• USB-C Device Charging (Optional) — With the AT-PS-245-D4 power supply, the USB-C port charges laptops and mobile devices at up to 60 W.
• Audio De-Embedding to Balanced Analog Output — De-embeds two-channel stereo audio from any input to a balanced 5-pin captive screw output for amplifier connection.
• HDCP 2.2 Compliant — Supports protected content from Ultra HD Blu-ray players, streaming devices, and other HDCP 2.2 sources and sinks.
• Integrated Web GUI and Velocity Device Manager — Browser-based configuration and TCP/IP / RS-232 control with support for Atlona Velocity and third-party control systems.

Typical Applications

• Conference room and boardroom AV systems with under-table switcher installation and remote display extension
• University lecture halls and classrooms requiring USB-C and HDMI laptop connectivity at a lectern
• Auditoriums and training rooms pairing a 4K projector with a 1080p confidence monitor using dual mirrored outputs
• Larger AV systems where the AT-OME-ST31A provides localized input switching at student pods or workstations
• Installations requiring automatic display on/off control without a separate control system
• Furniture-mounted or under-table AV installations where local AC power is not available

Technical Specifications

Frequently Asked Questions

Q: What receivers are compatible with the AT-OME-ST31A?

The AT-OME-ST31A is compatible with the AT-OME-RX11, AT-OME-RX21, and AT-OME-RX31 Omega Series receivers. It is also compatible with the AT-UHD-EX-100CE-RX-PSE and can drive Atlona HDBaseT-equipped matrix switchers such as the AT-OME-PS62. Refer to the Atlona compatibility table for a full listing.

Q: Does the USB-C port support USB data transfer?

No. The USB-C port on the AT-OME-ST31A supports AV signals via USB-C Alternate Mode and optional device charging. USB data transfer is not supported on this port.

Q: Can the AT-OME-ST31A charge a laptop through the USB-C port?

Yes, with the optional AT-PS-245-D4 power supply. When locally powered by this supply, the USB-C port can charge devices at up to 60 W (20 V / 3 A). When the unit is powered solely over HDBaseT, device charging through USB-C is not available.

Q: How is the AT-OME-ST31A powered when installed under a table?

The transmitter receives IEEE 802.3af PoE from a compatible Atlona HDBaseT receiver or switcher over the HDBaseT link. This eliminates the need for a local power outlet, simplifying under-table and furniture-integrated installations.

Q: Does the AT-OME-ST31A require a separate control system for display automation?

No. The built-in automatic display control feature powers displays on and off via IP, RS-232, or CEC in response to source connection and disconnection events. An external control system is not required, though the unit is fully compatible with Atlona Velocity and third-party control systems.

Q: What cable type is recommended for 4K extension at 330 feet?

CAT6, CAT6a, or CAT7 cable is recommended for 4K/UHD extension at the full 330-foot (100-meter) range. CAT5e cable is supported but limits 4K distance to 295 feet (90 meters), while supporting 1080p at the full 330-foot distance.

Q: Is the AT-OME-ST31A compatible with 4K HDR sources?

Yes. The local HDMI and USB-C inputs support HDR10, Dolby Vision, and HLG at 60 Hz. HDR is supported on the local HDMI output as well. The HDBaseT output does not pass HDR metadata.

Q: Can the AT-OME-ST31A be used as part of a larger AV matrix system?

Yes. The AT-OME-ST31A can provide localized 3-input switching at a student pod, workstation, or remote table location, feeding its HDBaseT output into an Atlona matrix switcher such as the AT-OME-PS62 for centralized signal routing.