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Black transmitter and receiver boxes with HDMI, RJ45 and 3.5mm ports, plus IR kit and power adapters

STARTECH

STARTECH ST121HD20L HDMI over CAT6 extender 4K 60Hz 330ft 100m IR support

SKU CH-1M5M-1AV96 MPN ST121HD20L

Extends 4K 60 Hz HDMI up to 330 ft over CAT6 with IR, RS-232 and 7.1 audio, includes transmitter, receiver, cable, IR kit, power adapters and mounting brackets

  • Maximum extend distance330 ft (101 m)
  • First connector1 x HDMI (19 pin) Female 1 x RJ-45 Female 1 × 3.5 mm Mini-Ja
  • Second connector1 x HDMI (19 pin) Female 1 x RJ-45 Female 1 × 3.5 mm Mini-Ja
  • Product typeHDMI over Ethernet
  • Product colorBlack
  • DetailsAudio: Yes AV Input: HDMI AV Output: HDMI Cabling: Cat 6 UTP
  • Extends 4K 60Hz HDMI up to 330ft over CAT6 cabling
  • Delivers 7.1 surround sound with Dolby TrueHD and DTS-HD support
  • Reaches 1080p at 460ft for longer-distance installations
  • Includes IR kit and RS-232 adapters for remote control integration
  • Ships with transmitter, receiver, CAT6 cable, power adapters and mounting brackets

HDMI over CAT6 extender for 4K 60Hz signals

The ST121HD20L transmits 3840x2160 at 60 Hz up to 100 metres over Cat 6 UTP cabling. It includes transmitter and receiver units plus an IR kit for remote source control. Two universal power adapters and mounting brackets are supplied for quick installation.

330-foot 4K 60Hz reach over Cat 6

UltraHD 4K at 60 Hz is maintained to the full 330 feet distance; 1080p extends further to 460 feet. The Norelsys NS 5730 and NS 5731 chipset handles HDCP 2.2 and 7.1 surround audio pass-through without compression.

Passive cooling with external 5 V 3 A adapters

Each unit draws power from its own 110-240 V AC adapter delivering 5 V DC at 3 A. No fans are fitted so operation is silent. The compact 4.37 by 1.02 by 3 inch enclosures run cool under continuous use.

How it compares

Measured against everything we stock in Signal Extenders & Boosters, at today’s prices. Recalculated every night.

Price $354.99
Pricier than about 80% of the 77 comparable items (median $108.99).

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Specifications

Product
Brand nameStarTech.com
Model nameST121HD20L
Product typeHDMI over Ethernet
Product colorBlack
Ports & slots
First connector1 x HDMI (19 pin) Female
1 x RJ-45 Female
1 × 3.5 mm Mini-Jack (3 Position) Female Input
1 × 3.5 mm Mini-Jack (3 Position) Female Output
1 × 3.5 mm Mini-Jack (3 Position) Female
Second connector1 x HDMI (19 pin) Female
1 x RJ-45 Female
1 × 3.5 mm Mini-Jack (3 Position) Female Input
1 × 3.5 mm Mini-Jack (3 Position) Female Output
1 × 3.5 mm Mini-Jack (3 Position) Female
Size & build
Product dimensions4.37 in × 1.02 in × 3 in
Product weight0.6 lb (0.27 kg)
Shipping weight1.45 kg
Package size249 × 196 × 97 mm
In the box
In the box1 x HDMI Transmitter
1 x HDMI Receiver
1 x CAT6 Cable
1 x IR Kit
2 x Universal Power Adapters (NA/JP, EU, UK, ANZ)
2 × 3.5 mm to DB-9 RS-232 Adapters
4 x Mounting Brackets
1 x Quick-Start Guide
More details
Maximum extend distance330 ft (101 m)

Questions about this item

Will 4K at 60 Hz arrive cleanly at the full 330 ft distance?

Yes, the extender is rated for 3840x2160 at 60 Hz up to 330 ft over Cat 6 UTP; 1080p can reach 460 ft.

What cabling standard does the RJ-45 link require and what bandwidth does it carry?

It uses Cat 6 UTP cabling and transports 4K 60 Hz HDMI with HDCP 2.2 and 7.1 surround audio.

How do I mount the transmitter and receiver units in a rack or on a wall?

Four mounting brackets are included; each unit measures 4.37" x 1.02" x 3" and weighs 0.60 lbs.

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