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A pair of compact metal boxes with LC fiber ports HDMI and 3.5mm jacks

STARTECH

STARTECH ST121HD20FXA2 4K 60Hz HDMI Fiber Extender Kit 1km/300m LC 7.1ch 3.5mm RS232 IR

SKU CH-PR65-P7TFR MPN ST121HD20FXA2

Extends 4K 60Hz HDMI with 7.1ch audio up to 3300ft over single-mode or 1000ft over multimode LC fiber, includes 3.5mm audio extraction, RS-232 and IR pass-through

  • Extend 4K 60Hz video up to 3300ft over Single Mode fiber
  • Extend 4K 60Hz video up to 1000ft over Multimode fiber
  • Transmit 7.1ch audio with HDR10 and HDCP 2.2 support
  • Extract audio to 3.5mm output while keeping HDMI audio active
  • Install without IP setup, drivers or network equipment

Pro A/V Extender Kit

The StarTech ST121HD20FXA2 extends a 4K 60Hz HDMI signal with 7.1ch audio up to 1000m over single-mode fiber or 300m over multimode fiber. It uses a single-strand LC/UPC connection and supports HDR10, HDCP 2.2 and 4:4:4 chroma subsampling. The kit includes both transmitter and receiver units for a complete point-to-point link.

Sustained Signal Integrity

The single-strand optical fiber carries full-bandwidth video while remaining immune to electromagnetic interference. No IP configuration, drivers or network equipment are required, so the link stays stable without software overhead. Metal housings with integrated mounting brackets provide a secure physical installation for continuous operation.

Audio Extraction Upgrade

The receiver adds a 3.5mm output that extracts source audio for separate playback while simultaneously passing audio through the HDMI output. RS232 and IR extension ports carry control signals alongside the video stream. This kit replaces direct HDMI runs or copper extenders when distances exceed standard cable limits or EMI immunity is required.

Highlights

  • Extend 4K 60Hz video up to 3300ft over Single Mode fiber
  • Extend 4K 60Hz video up to 1000ft over Multimode fiber
  • Transmit 7.1ch audio with HDR10 and HDCP 2.2 support
  • Extract audio to 3.5mm output while keeping HDMI audio active
  • Install without IP setup, drivers or network equipment

Specifications

No published specifications for this item yet.

Questions about this item

Does the receiver unit generate noticeable heat or fan noise when running continuously?

The kit uses passive metal housings with no fans, so it operates silently and stays cool during all-day use.

What fiber patch cable and connectors do I need to have on hand before installing this extender?

You need a single-strand LC/UPC fiber patch cable — either Single Mode for up to 3300 ft or Multimode for up to 1000 ft.

Can I keep my older 1080p display and AV receiver while using this 4K 60Hz extender kit?

Yes, the transmitter and receiver are HDCP 2.2 compliant and will down-negotiate to 1080p, so legacy sinks work without changes.

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