UHD-EX120C-K Overview and Use Cases

What Is the UHD-EX120C-K?

The OREI UHD-EX120C-K is a USB-C to HDMI extender kit that sends video from a USB-C laptop or PC to an HDMI display over a single CAT 6 / CAT 6a / CAT 7 cable.

The kit includes a USB-C Transmitter and HDMI Receiver. The USB-C source connects to the Transmitter, the HDMI display connects to the Receiver, and a CAT cable connects the Transmitter to the Receiver.

The UHD-EX120C-K supports HDMI 2.0 and HDCP 2.2 / 1.4, with a video bandwidth of 18Gbps. It supports video resolutions up to 4K@120Hz, 4K@60Hz up to 60m / 196ft, 2560x1440@120/144Hz up to 30m / 98ft, and 4K@100/120Hz up to 25m / 82ft. It also supports HDR10, HDMI 3D, EDID passthrough, auto downscaling, PCM / DTS / Dolby audio formats, and plug-and-play setup. Only the Receiver requires external power through the included Micro USB cable.

The UHD-EX120C-K is useful for presentations, digital signage, classrooms, conference rooms, offices, meeting rooms, gaming setups, and professional AV installations where a USB-C computer needs to be connected to a remote HDMI display.

IMPORTANT — USB-C Source Must Support Video Output

The UHD-EX120C-K uses USB-C input on the Transmitter.

The USB-C port on the laptop or PC must support video output.

Not every USB-C port supports video. Some USB-C ports are only for charging or data transfer.

If there is no video, confirm that the computer’s USB-C port supports DisplayPort Alt Mode or USB-C video output.

IMPORTANT — UHD-EX120C-K Supports 4K@120Hz

The UHD-EX120C-K supports video resolutions up to 4K@120Hz.

It also supports 4K@60Hz, 2560x1440@120/144Hz, and 1080p@120Hz.

To use 4K@120Hz, the laptop or PC, USB-C output, CAT cable, Receiver, HDMI cable, and display must all support the required resolution and refresh rate.

IMPORTANT — Transmission Distance Depends on Resolution

The UHD-EX120C-K supports different transmission distances depending on the resolution.

For best performance, use high-quality CAT 6 or better cable.

IMPORTANT — Use a Direct CAT Cable Connection

The UHD-EX120C-K requires a direct CAT 6 / CAT 7 cable connection between the Transmitter and Receiver.

Do not connect the extender through:

1. Network switch
2. Router
3. Internet network
4. LAN switch
5. Ethernet wall network system 
    
   This product is not an AV-over-IP extender. The CAT cable is used as a direct signal extension cable between the Transmitter and Receiver.

IMPORTANT — Use EIA-568B Direct Interconnection Wiring

The manual states that this extender requires a direct interconnection CAT 6 / 7 cable following the EIA-568B standard.

If a cross-interconnection CAT 6 / 7 cable such as EIA-568A is used, the extender may go into protection mode and will not display the media source.

For best results, use straight-through wiring such as T568B to T568B.

IMPORTANT — Only the Receiver Requires Power

The UHD-EX120C-K does not require external power on both ends.

The Transmitter is powered by the USB-C source device.

The Receiver requires DC 5V / 500mA power through the included Micro USB cable.

If the Receiver does not power on or display video, confirm the Micro USB power cable is connected to the Receiver.

IMPORTANT — No HDMI Loop Out

The UHD-EX120C-K does not include HDMI loop out.

It has:

1. USB-C input on the Transmitter
2. HDMI output on the Receiver 
    
   If a local display is needed near the computer, use the computer’s additional display output or a separate USB-C docking / display solution.

IMPORTANT — No IR or RS-232 Control

The UHD-EX120C-K manual does not list IR IN, IR OUT, RS-232, or control pass-through ports.

This model is designed for USB-C video extension to an HDMI display.

If IR or RS-232 control extension is required, use a different extender model that includes those control ports.

IMPORTANT — EDID Passthrough and Auto Downscaling Are Supported

The UHD-EX120C-K supports EDID passthrough and auto downscaling.

EDID passthrough helps the USB-C source detect the connected HDMI display’s supported resolution.

Auto downscaling can help with display compatibility when the source and display support different resolutions.

If there is no video or the wrong resolution appears, check the computer display settings, display capability, HDMI cable, CAT cable, and Receiver power.

Ports and Panel Layout

Step-by-Step Setup

1. Connect the USB-C Transmitter to the USB-C port of your laptop or PC. 
   Important: The USB-C port must support video output.
2. Connect the HDMI display to the HDMI output on the Receiver. 
   Examples include a TV, monitor, projector, or commercial display.
3. Connect the Transmitter RJ45 output to the Receiver RJ45 input using CAT 6 / CAT 6a / CAT 7 cable.
4. Make sure the CAT cable uses direct straight-through wiring, preferably EIA-568B / T568B.
5. Connect the included Micro USB cable to the Receiver for power.
6. Power on the laptop or PC and HDMI display.
7. Select the correct HDMI input on the display.
8. Open the computer display settings and choose duplicate, extend, or second-screen-only mode if needed.
9. Test video and audio.

CAT Cable Requirement — Critical

For best performance, use high-quality CAT 6 / CAT 6a / CAT 7 cable.

Poor-quality, damaged, or incorrectly terminated CAT cable may cause:

1. No video
2. Flickering
3. Black screen
4. Signal dropouts
5. 4K@120Hz not working
6. 1440p@144Hz not working
7. HDR10 not working
8. Audio dropouts
9. Protection mode 
    
   Do not connect the CAT cable through a network switch or router.

HDMI Cable Requirement — Critical

Use a high-quality HDMI cable from the Receiver to the display.

Poor HDMI cables may cause:

1. No picture
2. Flickering
3. Black screen
4. 4K@120Hz not working
5. 4K@60Hz not working
6. HDR10 not working
7. Audio dropouts
8. HDCP handshake issues 
    
   For troubleshooting, test the display directly with another HDMI source and try a shorter HDMI cable.

Understanding the Transmitter

The Transmitter is installed near the laptop or PC.

It has:

1. USB-C input cable for the source device
2. RJ45 output to connect to the Receiver 
    
   The Transmitter is powered by the USB-C source device and does not need a separate power adapter. 
    
   Important: The USB-C port must support video output.

Understanding the Receiver

The Receiver is installed near the HDMI display.

It has:

1. RJ45 input from the Transmitter
2. HDMI output to the display
3. DC 5V power input through Micro USB 
    
   The Receiver must be powered using the included Micro USB cable.

Understanding USB-C Video Output

USB-C is a connector type, but not every USB-C port supports video.

The UHD-EX120C-K requires a USB-C port that can output video.

Compatible source devices may include:

1. Laptops with USB-C video output
2. PCs with USB-C video output
3. USB-C ports that support DisplayPort Alt Mode
4. USB-C ports designed for external monitor output 
    
   If the laptop charges through USB-C but does not show video, the port may not support video output.

Understanding EDID Passthrough

EDID tells the source device what resolution and audio format the connected display supports.

The UHD-EX120C-K supports EDID passthrough, allowing the laptop or PC to detect the HDMI display through the extender.

This helps with:

1. Resolution detection
2. Refresh rate detection
3. HDMI handshake
4. Display compatibility 
    
   If the correct resolution does not appear, reconnect the extender after the display is powered on, or restart the computer.

Understanding Auto Downscaling

Auto downscaling helps improve compatibility when the source sends a resolution that the connected display may not support.

For example, if the source is capable of 4K but the display only supports a lower resolution, auto downscaling can help send a compatible signal.

Downscaling does not upgrade a lower-resolution source to a higher resolution. It only helps reduce the signal to a compatible format when needed.

Supported Video and Audio

The UHD-EX120C-K supports video formats including:

Supported features:

Supported audio formats:

The connected source and display/audio device must also support the selected video and audio format.

What Source Devices Is the UHD-EX120C-K Compatible With?

The OREI UHD-EX120C-K is compatible with USB-C source devices that support video output, such as:

1. Laptops with USB-C video output
2. PCs with USB-C video output
3. USB-C devices with DisplayPort Alt Mode
4. Work laptops used for presentations
5. Compatible gaming laptops
6. Compatible desktop PCs with USB-C video output 
    
   The USB-C source must support external display output.

What Displays Is the UHD-EX120C-K Compatible With?

The UHD-EX120C-K can connect to HDMI displays such as:

1. 4K TVs
2. 4K@120Hz displays
3. Gaming monitors
4. 1080p TVs
5. Monitors
6. Projectors
7. Commercial displays
8. Conference room displays
9. Classroom displays
10. Digital signage displays 
     
    For 4K@120Hz, the display must support 4K@120Hz input. 
     
    For 2560x1440@144Hz, the display must support 1440p at 144Hz.

Frequently Asked Questions

Q: What is the OREI UHD-EX120C-K used for? 
A: The UHD-EX120C-K is used to extend video from a USB-C laptop or PC to an HDMI display over CAT 6 / CAT 6a / CAT 7 cable. It supports up to 4K@120Hz and is useful for presentations, digital signage, classrooms, offices, and AV setups.

Q: Does the UHD-EX120C-K support 4K@120Hz? 
A: Yes. It supports 4K@100/120Hz up to 25m / 82ft over CAT 6 / CAT 6a / CAT 7 cable.

Q: Does the UHD-EX120C-K support 4K@60Hz? 
A: Yes. It supports 4K@60Hz up to 60m / 196ft over CAT 6 / CAT 6a / CAT 7 cable.

Q: Does it support 1440p at high refresh rate? 
A: Yes. It supports 2560x1440@120/144Hz up to 30m / 98ft.

Q: Does the UHD-EX120C-K support 8K? 
A: No. The manual lists support up to 4K@120Hz.

Q: What HDMI version does it support? 
A: It supports HDMI 2.0.

Q: What HDCP version does it support? 
A: It supports HDCP 2.2 and HDCP 1.4.

Q: What video bandwidth does it support? 
A: It supports 18Gbps video bandwidth.

Q: Does it support HDR? 
A: Yes. HDR10 is supported.

Q: Does it support HDMI 3D? 
A: Yes. HDMI 3D is supported.

Q: Does it support EDID passthrough? 
A: Yes. EDID passthrough is supported.

Q: Does it support auto downscaling? 
A: Yes. Auto downscaling is supported.

Q: How far can it extend video? 
A: It supports up to 60m / 196ft for 4K@60Hz, up to 30m / 98ft for 2560x1440@120/144Hz, and up to 25m / 82ft for 4K@100/120Hz.

Q: What CAT cable should I use? 
A: Use high-quality CAT 6, CAT 6a, or CAT 7 cable.

Q: Can I connect it through a network switch or router? 
A: No. This extender requires a direct CAT cable connection between the Transmitter and Receiver.

Q: What wiring standard should the CAT cable use? 
A: The manual states that the extender requires direct interconnection CAT 6 / 7 cable following the EIA-568B standard.

Q: What happens if I use cross-interconnection wiring? 
A: The manual says the extender may go into protection mode and will not display the media source.

Q: Does the Transmitter need power? 
A: No external power is required for the Transmitter. It is powered by the USB-C source device.

Q: Does the Receiver need power? 
A: Yes. The Receiver requires DC 5V / 500mA power through the included Micro USB cable.

Q: Does it support Power over Cable? 
A: The manual does not list PoC. The Receiver is powered separately through Micro USB, while the Transmitter is powered by the USB-C source.

Q: Does the Transmitter have HDMI loop out? 
A: No. This model does not include HDMI loop out.

Q: Does it support IR control? 
A: No. The manual does not list IR control ports.

Q: Does it support RS-232? 
A: No. The manual does not list RS-232 control.

Q: What audio formats are supported? 
A: The manual lists PCM, DTS, and Dolby audio formats.

Q: Why am I not getting video from my laptop? 
A: Confirm that the laptop’s USB-C port supports video output. Some USB-C ports only support charging or data transfer.

Q: What should I do if there is no video? 
A: Check that the Receiver is powered through Micro USB, confirm the CAT cable is directly connected and correctly wired, make sure the USB-C port supports video output, and test with a shorter CAT cable.

Q: What should I do if 4K@120Hz does not work? 
A: Keep the CAT cable within 25m / 82ft, use high-quality CAT 6 / CAT 6a / CAT 7 cable, confirm the laptop or PC supports 4K@120Hz output over USB-C, and confirm the display supports 4K@120Hz.

Q: What should I do if 4K@60Hz does not work? 
A: Keep the CAT cable within 60m / 196ft, use high-quality CAT cable, confirm the source and display support 4K@60Hz, and check the computer display settings.

Q: Does the UHD-EX120C-K need external power? 
A: Yes, but only on the Receiver side. Connect the included Micro USB cable to power the Receiver.