StarTech.com ST121HD20L

4K 60Hz HDMI over CAT6 extender up to 100m with IR and RS-232

A transmitter/receiver HDMI extender kit for sending 4K 60Hz video up to 100m over CAT6, with 1080p support up to approximately 140m, IR control, RS-232 accessories and HDCP 2.2.

4K 60Hz to 100m1080p to 140mIR + RS-2322-year warranty

StarTech ST121HD20L 4K HDMI over CAT6 extender

Key capabilities

4K 60Hz over CAT6

Extends 3840×2160 60Hz HDMI video up to 100m using standard CAT6 UTP cabling.

Longer 1080p reach

Current StarTech documentation lists 1080p and lower resolutions up to approximately 140m.

IR and RS-232 support

Includes an IR kit plus 3.5mm-to-DB9 RS-232 adapters for remote-control and serial workflows.

HDCP 1.4 / 2.2 and HDMI audio

Supports HDCP 1.4/2.2 and common HDMI audio formats including Dolby TrueHD, Dolby Digital and DTS-HD.

What to know before buying

This is a point-to-point HDMI-over-CAT6 extender, not an Ethernet/IP streaming system. Use direct suitable CAT6 UTP cabling between transmitter and receiver and stay within the distance/resolution limits.

Australian version and manufacturer warranty

This item is the Australian version supplied by DeviceDeal and is covered by the official StarTech.com 2-year manufacturer warranty in Australia.

Please retain your DeviceDeal tax invoice as proof of purchase. Warranty coverage and claims are subject to StarTech.com warranty terms, eligibility requirements and product assessment.

Frequently asked questions

What maximum resolution does ST121HD20L support?

3840×2160 4K at 60Hz.

How far can it extend 4K 60Hz?

Up to 100m / approximately 328ft.

How far can it extend 1080p?

Current StarTech documentation lists up to approximately 140m.

What cabling is required?

CAT6 UTP.

Does it support IR remote control?

Yes. An IR kit is included.

Does it support RS-232?

Yes. Two 3.5mm-to-DB9 RS-232 adapters are included.

What HDCP versions are supported?

HDCP 1.4 and 2.2 are supported.

What warranty applies in Australia?

The Australian version supplied by DeviceDeal is covered by the official StarTech.com 2-year manufacturer warranty in Australia, subject to StarTech.com terms and product assessment.

(ST121HD20L)

Features and highlights

4K 60Hz over CAT6

Extends 3840×2160 60Hz HDMI video up to 100m using standard CAT6 UTP cabling.

Longer 1080p reach

Current StarTech documentation lists 1080p and lower resolutions up to approximately 140m.

IR and RS-232 support

Includes an IR kit plus 3.5mm-to-DB9 RS-232 adapters for remote-control and serial workflows.

HDCP 1.4 / 2.2 and HDMI audio

Supports HDCP 1.4/2.2 and common HDMI audio formats including Dolby TrueHD, Dolby Digital and DTS-HD.

4K 60Hz to 100m
1080p to 140m
IR + RS-232
2-year warranty

Warranty confidence: Official StarTech.com 2-year manufacturer warranty in Australia, subject to StarTech.com terms and assessment.

Specifications

Verified specifications for StarTech ST121HD20L.

General

Warranty	2 Years
AV Input	HDMI
AV Output	HDMI
Cabling	CAT6 UTP
Audio	Yes; 7.1 surround and common HDMI formats supported
Chipset	Norelsys NS5730 / NS5731

Performance

Maximum Distance	100m [328ft] at 4K 60Hz
1080p Distance	Up to approximately 140m
Supported Resolution	3840×2160 (4K) 60Hz; 2560×1600 60Hz; 1920×1200 60Hz; 1920×1080 60Hz; 1280×720 60Hz
HDCP	1.4 / 2.2
3D	Supported

Connectivity

Transmitter/Receiver	HDMI, RJ45 and 3.5mm TRS connections
IR	IR extension kit included
RS-232	2 × 3.5mm-to-DB9 adapters included

Power

Power Source	2 AC adapters included
Input	110240V AC
Output	5V DC / 3A
Center Tip	Positive
Plug Type	M

Environment

Operating Temperature	-5°C to 40°C
Storage Temperature	-15°C to 55°C
Humidity	095% RH non-condensing

In the Box

Included	HDMI transmitter; HDMI receiver; CAT6 cable; IR kit; 2 universal power adapters (NA/JP, EU, UK, ANZ); 2 × 3.5mm-to-DB9 RS-232 adapters; 4 mounting brackets; quick-start guide

SKU	ST121HD20L
Barcode #	65030882637
Brand	STARTECH
Shipping Weight	1.4500kg
Shipping Width	0.009m
Shipping Height	0.025m
Shipping Length	0.020m

2-year official manufacturer warranty

StarTech.com warranty in Australia

This item is the Australian version supplied by DeviceDeal and is covered by the official StarTech.com 2-year manufacturer warranty in Australia.

Please retain your DeviceDeal tax invoice as proof of purchase.

Warranty coverage and claims are subject to StarTech.com warranty terms, eligibility requirements and product assessment. This wording does not promise automatic replacement or guaranteed claim approval.