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Item#: 9SIA25V3H50610

StarTech ST121UTPHD2 HDMI over Cat5 Video Extender with RS232 and IR Control

  • HDMI over Cat5 Interface

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The ST121UTPHD2 HDMI over Cat5 Extender Kit extends the audio and video signal output from an HDMI-equipped device by up to 330 feet (100 meters) over a single CAT5 cable, or up to 165 feet (50 meters) over a single CAT6 cable. The extender supports full high-definition video (1080p) and HD 3D, and also extends the accompanying digital audio signal. It offers bi-directional RS232 serial and Infrared (IR) interfaces, which enable you to control the HDMI audio-video source from either end of the connection for convenient, time-saving control of the media source.

The HDMI over CAT5 Extender Kit includes both the HDMI to CAT5 transmitter, and the needed Cat5 to HDMI receiver, for a cost-effective, ready-to-use digital signage solution.

To help ensure seamless performance without any unexpected or unnecessary interruptions, the HDMI Ethernet transmitter and receiver units are fully compliant with high-speed HDMI and HDCP standards, and each unit features lockable power connectors to prevent accidental disconnections.

  • newegg Control the HDMI Audio-Video Source from Either End of the Connection Integrated bi-directional RS232 and IR interfaces enable you to communicate with, monitor, and control your source audio-video device, from either end of the connection.
  • newegg Excellent Image and Sound Quality With support for full 1080p resolution and accompanying digital audio, the ST121UTPHD2 lets you display your content the way it's meant to be seen and heard.

Learn more about the STARTECH ST121UTPHD2




Extender & Repeater Type
Non Wall Plate Extender


100 m / 330 ft.
Resolution Support
1080p @ 60Hz, 48-bit
Supports Dolby TrueHD, DTS-HD MA


LED Indicator
1 - HDCP (Green)
1 - Mode (Green)
1 - Power (Green)
1 - RJ45 Link (Green)


System Requirements
1X Standard CAT5 cable
1X HDMI Cable for Remote Unit (Local Cable Included)


Power Supply
Center Tip Polarity: Positive
Input Current: 0.6
Input Voltage: 110 ~ 240 AC
Plug Type: M
Power Adapter Included: Two
Output Voltage: 12 DC
Output Current; 1.24A


Cabling: Cat 5 UTP or better
Audio: Yes
Industry Standards: High Speed HDMI and HDCP compliant
Daisy-Chain: No

Local Unit Connectors: 1 - IrDA (Infrared; SIR/FIR)
Remote Unit Connectors: 2 - IrDA (Infrared; SIR/FIR)
Local Unit Connectors
1 - DB-9 (9 pin; D-Sub) Female
1 - RJ-45 Female
2 - HDMI (19 pin) Female
Remote Unit Connectors
1 - DB-9 (9 pin; D-Sub) Male
1 - HDMI (19 pin) Female
1 - RJ-45 Female

Maximum Data Transfer Rate:
HDMI - 3.4Gbps
RS232 - 115200bps baud

IR Interface
38Khz / +/-10 degree / 5M

Color: Black
Enclosure Type: Steel


Use this HDBaseT extender to extend your HDMI video and audio over standard CAT5 cabling

Compatible with HDMI video sources and HDMI monitors, televisions and projectors

Support for RS232 Serial and Infrared control

HDBaseT Extender / HDMI Cat5 Extender / HDMI to Cat5

HDMI over Cat5 / HDMI Extender / HDMI over Ethernet

With HDBaseT extend HDMI, IR, and RS-232 through one CAT5e or CAT6 cable

Ideal for digital signage applications in financial educational medical and business sectors

Dimensions & Weight

1.00" x 3.10" x 5.90"
0.67 lb.

Package Contents

Package Content
1 - Local HDMI Extender Unit
1 - Remote HDMI Receiver Unit
1 - IR Receiver Cable
1 - IR Transmitter Cable
1 - HDMI Cable - 4 ft. (1.2m)
2 - Universal Power Adapter NA / UK / EU
1 - User Manual
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

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Home > 
Components > 
Professional Video Devices > 
Pro A/V Extender & Repeater > 
Item#: 9SIA25V3H50610
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