What Is the UHD-FOUC10-K?
The OREI UHD-FOUC10-K is a 4K USB-C video extender kit that carries USB-C video and audio over a single fiber optic cable across very long distances, up to 10 km over single-mode fiber or up to 300 m over OM4 multi-mode fiber.
It is useful for setups where a USB-C source, such as a laptop or computer, needs to drive a display located far beyond the reach of a standard USB-C cable. Instead of being limited to a few feet, the UHD-FOUC10-K uses a Transmitter and a Receiver connected by one fiber optic cable to carry the signal across a building, campus, or facility, with strong resistance to interference.
The kit includes two units that work as a pair:
- Transmitter (TX): connects to the USB-C source device through its USB-C IN port
- Receiver (RX): connects to the display through its USB-C OUT port
The UHD-FOUC10-K supports video resolutions up to 4K2K at 50/60Hz RGB 4:4:4, with up to 32.4Gbps total bandwidth (HBR3). It is USB-C DisplayPort Alt Mode and HDCP 2.3/2.2/1.x compliant, passes through HDR10, HDR10+, Dolby Vision, and HLG, and supports a full range of audio formats including LPCM 7.1, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, and DTS:X. It also supports all standard VESA resolutions.
IMPORTANT — The UHD-FOUC10-K Is a Transmitter and Receiver Kit
The UHD-FOUC10-K is sold and used as a matched pair. The Transmitter and the Receiver are connected to each other using a single LC fiber optic cable with SFP+ modules.
This is especially useful when:
- A USB-C source and its display are in different locations
- A standard USB-C cable cannot reach between the source and the display
- You need reliable video over very long distances, beyond what copper cabling can do
- You want a clean, single-cable run across a building, campus, or facility
Both the Transmitter and the Receiver must be powered using the included power adapters for the kit to work.
IMPORTANT — USB-C Video Requires DP Alt Mode on the Source
The UHD-FOUC10-K carries USB-C video using DisplayPort Alt Mode.
For video to work, the connected USB-C source must support DP Alt Mode. When connecting your source, use a proper USB-C cable, and do not use a DisplayPort-to-HDMI converter in the signal path, as this prevents the extender from working correctly.
IMPORTANT — Cable Distance Depends on Fiber Type
The maximum distance between the Transmitter and the Receiver depends on the type of fiber optic cable you use.
- Up to 10 km (about 6.2 miles) over single-mode fiber
- Up to 300 m (about 1,000 feet) over OM4 multi-mode fiber
Single-mode fiber is required for the full 10 km distance. Multi-mode OM4 fiber can be used, but the maximum distance drops to 300 m.
Ports and Panel Layout
The UHD-FOUC10-K kit has two units. The Transmitter connects to the USB-C source, and the Receiver connects to the display.
Transmitter
| Port / LED | Location | Function |
| IN | Transmitter | USB-C input. Connect a USB-C source device such as a laptop, computer, or streaming device |
| LINK indicator | Transmitter | Green LED that lights up when there is a proper fiber connection between the Transmitter and the Receiver |
| SERVICE | Transmitter | USB-C port used for firmware updates |
| SFP+ OUT | Transmitter | Connect a fiber optic cable using an SFP+ module. The other end connects to the Receiver |
| POWER indicator | Transmitter | Green LED that lights up when the Transmitter is powered on |
| DC 5V | Transmitter | Connect the included power adapter |
Receiver
| Port / LED | Location | Function |
| OUT | Receiver | USB-C output. Connect a display device such as a TV or monitor |
| LINK indicator | Receiver | Green LED that lights up when there is a proper fiber connection between the Transmitter and the Receiver |
| SERVICE | Receiver | USB-C port used for firmware updates |
| SFP+ IN | Receiver | Connect a fiber optic cable using an SFP+ module. The other end connects to the Transmitter |
| POWER indicator | Receiver | Green LED that lights up when the Receiver is powered on |
| DC 5V | Receiver | Connect the included power adapter |
Step-by-Step Setup
- Insert an SFP+ module into the fiber port on both the Transmitter and the Receiver.
- Run a single LC fiber optic cable from the SFP+ OUT port on the Transmitter to the SFP+ IN port on the Receiver.
- Connect your USB-C source device, such as a laptop, to the IN port on the Transmitter using a USB-C cable.
- Connect your display, such as a TV or monitor, to the OUT port on the Receiver.
- Connect the included power adapters to the DC 5V ports on both the Transmitter and the Receiver, then plug them into power outlets.
- Confirm that the green POWER indicators are on at both units, and that the green LINK indicators are lit, which means the fiber connection is established.
- Turn on the source and the display. Video and audio should pass through automatically.
Note: The LINK LED lights up only when there is a proper fiber connection between the two units. If it does not light up at both ends, check the fiber cable and the SFP+ modules.
Cable Requirement — Important
The UHD-FOUC10-K uses an LC fiber optic cable with SFP+ modules between the Transmitter and the Receiver.
- Use single-mode fiber for runs up to 10 km
- Use OM4 multi-mode fiber for runs up to 300 m
Make sure the SFP+ modules are properly inserted into both units before connecting the cable, and use a quality USB-C cable on the source side.
Understanding Plug-and-Play USB-C Video Extension
The UHD-FOUC10-K extends a USB-C video signal over fiber so that a display located far from the source behaves as if it were directly connected. Once the Transmitter is connected to a DP Alt Mode source and the Receiver is connected to a display, the source outputs to the remote display automatically.
Because the connection runs over fiber, the signal is highly resistant to electromagnetic interference, which makes the UHD-FOUC10-K well suited to long runs and electrically noisy environments. The extender supports resolutions up to 4K at 60Hz with HDR pass-through.
What Sources Is the UHD-FOUC10-K Compatible With?
The UHD-FOUC10-K works with USB-C source devices that support DisplayPort Alt Mode video output.
It can be used with:
- Laptops and computers with a USB-C video output
- Streaming devices and media players with USB-C video
- Other USB-C sources that support DP Alt Mode
The extender is HDCP 2.3, 2.2, and 1.x compliant and passes through HDR10, HDR10+, Dolby Vision, and HLG. A DisplayPort-to-HDMI converter should not be used in the signal path.
What Displays Is the UHD-FOUC10-K Compatible With?
The UHD-FOUC10-K outputs to displays through a USB-C connection at the Receiver.
It can be used with:
- TVs with a USB-C video input
- Monitors with a USB-C video input
- Displays supporting 4K at 60Hz with HDR
For full resolution, the display should support 4K2K at 50/60Hz RGB 4:4:4. All standard VESA resolutions are supported as well.
Frequently Asked Questions
Q: What is the OREI UHD-FOUC10-K used for?
A: The UHD-FOUC10-K is used to extend USB-C video and audio over a single fiber optic cable across long distances, up to 10 km over single-mode fiber or up to 300 m over OM4 multi-mode fiber, using a matched Transmitter and Receiver.
Q: How far can the UHD-FOUC10-K extend a signal?
A: It can extend video up to 10 km over single-mode fiber, or up to 300 m over OM4 multi-mode fiber.
Q: Can I use multi-mode fiber instead of single-mode?
A: Yes. OM4 multi-mode fiber can be used, but the maximum transmission distance drops to about 300 m (1,000 feet). Single-mode fiber is required for the full 10 km distance.
Q: What resolution does the UHD-FOUC10-K support?
A: It supports resolutions up to 4K2K at 50/60Hz RGB 4:4:4, with up to 32.4Gbps total bandwidth, plus all standard VESA resolutions.
Q: Does the UHD-FOUC10-K work with any USB-C device?
A: No. The USB-C source must support DisplayPort Alt Mode video output for the extender to carry video.
Q: Do I need to power both the Transmitter and the Receiver?
A: Yes. Both units require power from the included adapters connected to their DC 5V ports for the kit to work.
Q: What HDR formats are supported?
A: It passes through HDR10, HDR10+, Dolby Vision, and HLG, and supports audio formats including LPCM 7.1, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, and DTS:X.
Q: Why is there no video output or why is the display flickering?
A: Try lowering the resolution from the source, change the USB-C cable or the fiber optic cable, confirm the LINK LED is lit on both ends, and make sure you are not using a DisplayPort-to-HDMI converter in the signal path.
Q: What kind of cable do I need between the Transmitter and Receiver?
A: Use an LC fiber optic cable with SFP+ modules. Use single-mode fiber for distances up to 10 km, or OM4 multi-mode fiber for distances up to 300 m.
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