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StarTech HDMI over Cat5 Video Extender with RS232 and IR Control
SKU# AB68947, Model# ST121UTPHD2

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SKU # AB68947 | Model # ST121UTPHD2

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StarTech HDMI over Cat5 Video Extender with RS232 and IR Control - Max: 100m Extension - Supports up to UltraHD (4K) Resolution

Manufacturer Warranty: 2 Years Limited Warranty
Manufacturer Contact Info:,

The HDBaseT extender kit, extends HDMI up to 330 feet (100 Meters) over a single CAT5e or CAT6 cable. The extender supports Ultra HD and Full HD resolutions (4K / 1080p) with support for 3D and the accompanying 7.1 digital audio. For added versatility the transmitter and receiver can be used to transmit IR and RS232 serial communication over the same cable. The versatility of this video extender makes it an ideal solution for digital signage applications.

What is HDBaseT?

HDBaseT is a standardized, zero latency, video distribution technology that’s revolutionizing HDMI distribution. HDBaseT uses an advanced method of modulation that enables you to distribute uncompressed HDMI audio and video along with additional signals such as 100BaseT Ethernet, IR, RS-232 serial and power over cable.

Extend More with HDBaseT

The extender offers HDBaseT technology with HDMI, IR, and RS232 control in a single CAT 5 extender kit, for complete end-to-end control. Offering greater versatility than traditional HDMI extenders or HDMI cabling alone HDBaseT is the clear choice for every integrator and system designer.  The IR extension enables you operate your display and an IR-enabled source device, such as a Blu-ray player or TV Set top box, from either end of your extension. While RS232 control let you to connect a serial I/O device at your display - an ideal solution for adding a serial touch screen interface to your remote display.

Astonishing Picture Quality from an Impressive Distance

With the A/V industry quickly adopting 4K as the new high-resolution video standard, long range video distribution can be a challenge with standard HDMI cables beginning signal degradation at 30 feet.

With support for 4K you’ll be amazed at how HDBaseT maintains your Ultra HD picture quality, four times the resolution of high-definition 1080p, even at 330 feet away from your video source. Plus, because the extender is still backward compatible with High-Definition 1080p displays and video sources, you can rest assured this extender will make your video source look great in any remote digital signage application.

Simplify Your Setup

This extender has been specially crafted for a smooth, tidy installation. HDBaseT technology allows for single cable installation, for seamless integration using existing CAT5e or CAT6 infrastructure, avoiding the hassle of running multiple cables, while reducing potential failure points. Mounting hardware is also built-in to both the extender and receiver for discrete, professional mounting. 

The ST121UTPHD2 is backed by a 2-year warranty and free lifetime technical support.

Local Unit ConnectorsDB-9 (9 pin, D-Sub) Female
HDMI (19 pin) Female
IrDA (Infrared, SIR/FIR)
RJ-45 Female
Remote Unit ConnectorsDB-9 (9 pin, D-Sub) Male
HDMI (19 pin) Female
IrDA (Infrared, SIR/FIR)
RJ-45 Female
Operating Temperature0°C to 70°C (32°F to 158°F)
Storage Temperature-20°C to 85°C (-4°F to 185°F)
CablingCat 5 UTP or better
Industry StandardsHigh Speed HDMI® and HDCP compliant
LED IndicatorsHDCP (Green)
Mode (Green)
Power (Green)
RJ45 Link (Green)
Packaging Information
Shipping (Package) Weight1500 g [52.9 oz]
Audio SpecificationsSupports Dolby® TrueHD, DTS-HD MA
IR InterfaceIR Interface: Bi-directional
38Khz / ±10° / 5M
Max Distance100 m / 330 ft
Maximum Data Transfer RateHDMI® - 3.4Gbps
RS232 - 115200bps baud
Maximum Digital Resolutions4K
Supported Resolutions3840x2160 (4K)
1920x1080 (1080p)
1280x720 (720p)
Wide Screen SupportedYes
Physical Characteristics
Enclosure TypeSteel
Product Height25 mm [1 in]
Product Length150 mm [5.9 in]
Product Weight305 g [10.8 oz]
Product Width80 mm [3.1 in]
Center Tip PolarityPositive
Input Current0.6
Input Voltage110V-240V AC
Output Current1.24A
Output Voltage12 DC
Plug TypeM
Power Consumption (In Watts)12
Power Source2 AC Adapters Included
OS CompatibilityOS Independent
Special Notes / Requirements
System and Cable Requirements1X Standard CAT5 cable
1X HDMI Cable for Remote Unit (Local Cable Included)
What's in the Box
Included in PackageHDMI Cable - 4 ft (1.2 Meters)
IR Receiver Cable
IR Transmitter Cable
Local HDMI® Extender Unit
Remote HDMI® Receiver Unit
Universal Power Adapter NA / UK / EU
User Manual

SKU # AB68947 | Model # ST121UTPHD2

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