# AV transmitter & receiver StarTech ST121HD20FXA2 4K HDMI over Fiber Extender Kit 4K 60Hz 3300ft

**URL:** https://aio.lv/en/product--startech-st121hd20fxa2--10973315
**Data updated:** 2025-12-30 15:00 (EET)
**Category:** Audio & Video Extenders
**Manufacturer:** StarTech
**Manufacturer code:** ST121HD20FXA2
**EAN:** 0065030897303
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 646.99 €
**Prices and availability valid until:** 2026-07-09 23:59
**Price without VAT (21%):** 534.70 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-st121hd20fxa2--10973315

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 10.07.2026 | free |
| Pickup points | 15.07.2026 | 1.99 EUR |
| Courier delivery to door | 15.07.2026 | 4.99 EUR |

## Summary description

The StarTech ST121HD20FXA2 is an AV transmitter and receiver kit that supports 4K resolution at 60Hz over fiber optic cables. It can transmit signals up to 3300ft for single mode and 1000ft for multimode. The kit includes features like HDR, HDCP support, and additional audio/RS232/IR extension capabilities, making it ideal for professional AV setups.

## Long description

The StarTech ST121HD20FXA2 is an AV transmitter and receiver kit that extends an HDMI audio and video signal over single-strand optical fiber. It supports Ultra HD 4K (4096 x 2160) at 60Hz with up to 7.1 channel audio and transmits up to 3300 ft (1000 m) over single-mode fiber or up to 1000 ft (300 m) over multimode fiber. The kit includes a transmitter and receiver, local HDMI output, IR and RS232 extension, EDID copy functionality, LED status indicators, and ESD protection.
Advantages
The fiber-based connection provides full-bandwidth video with immunity to electromagnetic interference, enabling reliable signal distribution in challenging environments. The kit supports audio extraction via a 3.5 mm output while simultaneously passing audio over HDMI, offers plug-and-play point-to-point installation without IP configuration or drivers, and includes mounting brackets and a durable steel housing for secure installation. Built-in IR and RS232 extension and EDID copy simplify integration with projectors and AV equipment.
Suitable for
Professional AV installations in auditoriums and conference rooms
Digital signage and long-run HDMI distribution
Lecture halls and education facilities with centralized AV control
Environments with high electromagnetic interference or long cable runs
Key specifications
Model: StarTech ST121HD20FXA2
Type: AV transmitter & receiver kit
Maximum resolution: 4096 x 2160 at 60Hz
Audio: up to 7.1 channel; 3.5 mm audio extraction on receiver
Fiber type: single-mode and multimode (single-strand LC)
Maximum distance: up to 1000 m (single-mode) / up to 300 m (multimode)
HDMI inputs/outputs: 1 HDMI input; local HDMI output on receiver
Additional interfaces: IR extension, RS232 (serial)
Housing: black steel with mounting brackets
ESD protection: 8 kV air / 6 kV contact
Warranty: 2 years with 24/5 technical support
How to use
Install the transmitter near the HDMI source and the receiver near the display. Connect the transmitter HDMI input to the source device and use a single-strand LC fiber cable between transmitter and receiver. Attach the local HDMI output on the receiver to a display if required. If audio extraction is needed, connect speakers or an amplifier to the receiver’s 3.5 mm output. Use the IR or RS232 ports to extend remote control or serial control signals to the remote equipment. Power both units and verify LED indicators to confirm link and power status.
Usage recommendations
For best results use certified single-mode fiber for long runs (up to 1000 m) or multimode fiber for shorter distances (up to 300 m), ensure connectors are clean to avoid signal loss, and verify EDID settings when connecting displays with unique resolutions or HDR requirements.

## Specifications

### Technical details

| Feature | Value |
|---|---|
| Sustainability compliance | Yes |
| Sustainability certificates | CE, RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| HDMI in | 1 |
| Number of HDMI outputs | 2 |
| Serial interface type | RS-232 |
| Serial ports quantity | 2 |
| USB connector type | Micro-USB B |
| DC-in jack | Yes |
| HDMI version | 2.1 |
| Remote (IR) input | 2 |
| Remote (IR) output | 2 |
| Line outputs (RCA) | 1 |
| USB ports quantity | 2 |
| Line-in | Yes |
| Connectivity technology | Wired |
| Fiber ports quantity | 2 |
| Fiber optic connector | LC |

### Power

| Feature | Value |
|---|---|
| Input current | 0.35 |
| Output current | 1 A |
| Operating voltage | 5 V |
| AC input voltage | 100 - 240 |
| Power plug type | Type M |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.28 kg |
| Height | 18 mm |
| Width | 68 mm |
| Depth | 134 mm |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 20 - 90 |
| Storage temperature (T-T) | -20 - 60 |
| Operating temperature (T-T) | 0 - 40 |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 1000 g |
| Package depth | 300 mm |
| Package height | 60 mm |
| Package width | 200 mm |

### Packaging content

| Feature | Value |
|---|---|
| AC adapter included | Yes |
| Quick start guide | Yes |
| IR blaster included | Yes |
| IR receiver included | Yes |

### Features

| Feature | Value |
|---|---|
| Type | AV transmitter & receiver |
| Maximum resolution | 4096 x 2160 |
| Maximum transfer distance | 1000 m |
| Product colour | Black |
| Audio output channels | 7.1 |
| Bandwidth | 18 Gbit/s |
| HDCP | Yes |
| Maximum refresh rate | 60 Hz |
| Electrostatic Discharge (ESD) protection | 8 kV |
| Baud rate | 115.2 Kbit/s |
| Chipset | SiFotonics SD1503/SD1513 |
| LED indicators | Power, Activity |
| Fiber mode structure | Single-mode, Multi-mode |
| HDCP version | 2.2 |
| Infrared (IR) frequency range | 20 - 60 |
| Extended display identification data (EDID) | Yes |
| High Dynamic Range (HDR) supported | Yes |
| Electrostatic Discharge (ESD) protection | Yes |
| High Dynamic Range (HDR) technology | High Dynamic Range 10 (HDR10) |

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 402 mm |
| Master (outer) case width | 325 mm |
| Master (outer) case length | 530 mm |
| Products per master (outer) case | 20 pc(s) |

## FAQ

### How much does the AV transmitter & receiver StarTech ST121HD20FXA2 cost, and is it available for purchase?

The price is 646.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 10.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All StarTech products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized StarTech service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: hdmi in, number of hdmi outputs, weight, type, maximum resolution, maximum transfer distance, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for AV transmitter & receiver StarTech ST121HD20FXA2?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/10973315/61394716_large.webp