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Two small steel-and-plastic boxes, one transmitter and one receiver, each with HDMI, RJ-45, serial and 3.5 mm ports

STARTECH

STARTECH ST121HDBTL 4K HDBaseT Extender 100m

SKU CH-T9HQ-G5A2S MPN ST121HDBTL

Extends HDMI, IR, RS-232 and power up to 100 m over a single Cat5e or Cat6 cable with 4K at 30 Hz support

  • HousingSteel and Plastic
  • Distance330 ft.
  • Resolution Support3840x2160 (4K) 2560x1600 1920x1200 1920x1080 (1080p) 1280x72
  • Audio7.1 Surround Sound
  • HDMILocal Unit: 1 - HDMI (19-pin) Female Input Remote Unit: 1 -
  • Serial InterfaceLocal Unit: 1 - DB 9-pin Serial Male Remote Unit: 1 - DB 9-p
  • Extend 4K HDMI up to 100 m over a single CAT5e cable
  • HDBaseT certified for reliable video and control extension
  • 1 surround sound and IR pass-through for full AV integration
  • RS-232 serial link enables remote device management
  • Mounting brackets and universal power adapter included for pro installs

HDBaseT Extender Kit

The StarTech.com ST121HDBTL extends HDMI, IR and RS-232 signals over a single CAT5e or CAT6 cable. It includes a transmitter, a receiver, a universal power adapter and mounting hardware for professional installation. The kit supports 7.1 surround sound and analogue audio via 3.5 mm jacks on both units. Status LEDs on each unit provide link confirmation at a glance.

Single-Cable Distance Limits

Video travels up to 35 metres at 4096 x 2160 (4K) 30 Hz or 70 metres at 1920 x 1080 (1080p) 60 Hz over CAT5e UTP or better. The HDBaseT certified link carries power, video, IR and serial control together without extra cabling. Maximum reach is 100 metres for lower resolutions. Performance drops if cable quality or length exceeds the stated thresholds.

4K and 1080p Headroom

The extender comfortably handles 4K at 30 Hz within 35 metres and 1080p at 60 Hz within 70 metres. Beyond those distances the 4K signal is not supported and 1080p may degrade. It does not serve applications needing 4K at 60 Hz or runs longer than 100 metres. Buyers requiring higher 4K frame rates or fibre-length runs should consider alternative technologies.

Highlights

  • Extend 4K HDMI up to 100 m over a single CAT5e cable
  • HDBaseT certified for reliable video and control extension
  • 1 surround sound and IR pass-through for full AV integration
  • RS-232 serial link enables remote device management
  • Mounting brackets and universal power adapter included for pro installs

Specifications

BrandStarTech.com
ModelST121HDBTL
HousingSteel and Plastic
Distance330 ft.
Resolution Support3840x2160 (4K)
2560x1600
1920x1200
1920x1080 (1080p)
1280x720 (720p)
Audio7.1 Surround Sound
HDMILocal Unit: 1 - HDMI (19-pin) Female Input
Remote Unit: 1 - HDMI (19-pin) Female Output
Serial InterfaceLocal Unit: 1 - DB 9-pin Serial Male
Remote Unit: 1 - DB 9-pin Serial Female
Network InterfaceLocal Unit: 1 - RJ-45 Female Output
Remote Unit: 1 - RJ-45 Female
Analog AduioLocal Unit: 1 - 3.5mm Mini Jack (3-Position) Female
Remote Unit: 1 - 3.5mm Mini Jack (3-Position) Female
LED Indicator1 - status LED (transmitter)
1 - status LED (receiver)
Power Consumption18W
Power SupplyCenter Tip Polarity: Positive
Input Current: 0.6A
Input Voltage: 100 ~ 240 AC
Output Current: 1.5A
Output Voltage: 12 DC
Plug Type: M
SpecificationHardware
Audio: Yes
Cabling: Cat 5e UTP or better
Output Signal: HDMI
Ports: 1
Performance
Maximum Cable Length: 100m
Maximum Digital Resolutions: 4096 x 2160 (4K) @ 30 Hz (35 meters), 1920 x 1080 (1080p) @ 60 Hz (70 meters)
Wide Screen Supported: Yes
Special Notes / Requirements
Note: If you want to add more displays, you can daisy chain this product with the HDBaseT repeater ST121HDBTRP.
Environmental
Humidity: 0% - 80%
Operating Temperature: 0 to 40 celsius degrees
Storage Temperature: -10 to 60 celsius degrees
Physical Characteristics
Color: Black
FeatureGet hassle-free video and control extension with HDMI, IR, RS-232 and power extended over a single CAT5e or CAT6 cable
Ensure a reliable video extension with an HDBaseT certified extender kit
Maintain astonishing picture quality at up to 115 ft. (35m) away, with support for Ultra HD 4K over non-proprietary CAT5e or CAT6 cabling
Also supports HD video resolutions such as 1920x1200 or 1080p at distances up to 230 ft. (70m)
Includes mounting hardware for professional installations
Dimensions1.10" x 2.60" x 3.60"
Weight16.00 oz.
Package Content1 - HDBaseT transmitter
1 - HDBaseT receiver
1 - universal power adapter (NA, EU, UK, ANZ)
1 - IR receiver
1 - IR blaster
1 - CAT5 cable
2 - mounting brackets
8 - foot pads
Shipping weight1.36 kg
Package size281 × 194 × 70 mm

Questions about this item

Which distance and resolution combination fits my install — 4K at 35 m or 1080p at 70 m?

The extender delivers 4096 x 2160 at 30 Hz up to 35 metres, or 1920 x 1080 at 60 Hz up to 70 metres over Cat5e or better cable.

What does the 330 ft headline distance actually provide in my rack?

At the full 100 m (330 ft) reach the unit supports 1080p 60 Hz; 4K 30 Hz is guaranteed to 35 m, so plan cable runs accordingly.

How does the HDBaseT link limit bandwidth and control signals in practice?

A single Cat5e or Cat6 cable carries HDMI video, 7.1 audio, IR and RS-232 serial up to the distances above; the HDBaseT certification ensures interoperability with other certified gear.

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