StarTech.com HDMI over CAT6 Extender - 4K 60Hz - 330ft / 100m - IR Support - HDMI Balun (ST121HD20L)

Experience true 4K clarity and reliable performance across rooms with the StarTech.com HDMI over CAT6 Extender. Designed to deliver pristine 4K video at 60Hz over long distances, this HDMI balun kit makes it possible to place your display far from the source without compromising image quality or signal integrity. Ideal for home theaters, corporate boardrooms, classrooms, and retail environments, ST121HD20L streamlines installations while maintaining professional-grade video and audio performance.

• Extend HDMI signals up to 330 feet (100 meters) over a pair of CAT6/6a/7 cables without degradation in picture or sound, enabling flexible room layouts and cleaner wiring.
• Support for 4K at 60Hz with 4:4:4 chroma ensures ultra-sharp details, smooth motion, and accurate color reproduction for the latest 4K content and high-end presentations.
• IR pass-through allows you to control your source from the remote display location, maintaining seamless operation and eliminating the need to return to the source room.
• HDMI balun design with transmitter and receiver units provides a compact, plug-and-play solution that scales from small offices to large installations with minimal footprint.
• Plug-and-play installation with no software or drivers required—just connect, power, and enjoy, making it a practical upgrade for existing systems and quick deployments for new builds.

Technical Details of StarTech.com HDMI over CAT6 Extender

• Model: ST121HD20L
• Product type: HDMI over CAT6 extender with IR support
• Video bandwidth: Supports 4Kx2K at 60Hz (4:4:4), delivering crisp details and wide color range
• Distance: Up to 100 meters (330 feet) over CAT6/6a/7 cable
• Cable: Requires standard Ethernet CAT6 (or higher) twisted-pair cables for the link between transmitter and receiver
• HDMI connection: HDMI input on the transmitter, HDMI output on the receiver
• HDMI compatibility: Works with HDMI-enabled sources and displays; supports embedded audio channels as part of the HDMI signal
• IR support: Infrared pass-through enables remote control of the source from the display side
• Power: Separate power supplies for transmitter and receiver (typical
power adapters included) for reliable operation over long runs
• Construction: Compact balun-style housings designed for easy installation in racks, cabinets, or behind displays
• Operating environment: Indoor use; suitable for home theaters, classrooms, offices, and retail displays

How to install StarTech.com HDMI over CAT6 Extender

• Power down your source device and display before making connections to prevent any electrical issues during setup.
• Connect the HDMI output from your source (Blu-ray player, computer, media streamer, etc.) into the transmitter’s HDMI input.
• Run two lengths of CAT6 cable from the transmitter to the receiver. Use CAT6 or higher for best results, and avoid excessive cable runs that exceed the 100-meter specification.
• Connect the receiver’s HDMI output to your display’s HDMI input. If you’re routing audio externally, configure the display or receiver accordingly.
• Plug in the power adapters to both transmitter and receiver. Once powered, the extender negotiates the HDMI signal and should establish a stable link, typically indicated by LED status indicators.

Frequently asked questions

• Q: What is the maximum distance for the StarTech HDMI over CAT6 Extender ST121HD20L?
• A: The system supports up to 100 meters (330 feet) over CAT6 cables, making it suitable for multi-room installations and large rooms.
• Q: Does this extender support 4K at 60Hz?
• A: Yes. The extender is designed to deliver 4Kx2K at 60Hz with 4:4:4 chroma for high-detail video playback and accurate color representation.
• Q: Is IR control supported?
• A: Absolutely. IR pass-through allows you to control the source from the display location, simplifying remote operation and reducing the need for direct access to the source device.
• Q: Is any software required to use this extender?
• A: No software or drivers are required. The system is designed to be plug-and-play, providing immediate HDMI signal extension once powered and connected.
• Q: What type of cables should I use?
• A: Use CAT6 or higher (CAT6a or CAT7 recommended for best performance) for the extension link between the transmitter and receiver.
• Q: Can I extend beyond 100 meters?
• A: The official maximum distance is 100 meters. For longer installations, consider alternative solutions or a multi-switch approach with repeaters where appropriate.