What Is the UHD-EXB400UR-K?
The OREI UHD-EXB400UR-K is an 18Gbps HDMI over HDBaseT extender kit with USB 2.0, bi-directional IR, EDID management, and PoC. It extends HDMI video, IR control, and USB KVM signals over a single CAT6 cable.
The kit includes a Transmitter and Receiver. The HDMI source connects to HDMI IN on the Transmitter, the remote display connects to HDMI OUT on the Receiver, and a CAT6 cable connects the Transmitter HDBT OUT to the Receiver HDBT IN.
The UHD-EXB400UR-K supports HDMI 2.0b and HDCP 2.2, with a video bandwidth of 18Gbps. It supports video resolutions up to 4K@60Hz 4:4:4, HDR, HDR10, HDR10+, Dolby Vision, HLG, USB 2.0 transmission, bi-directional IR pass-through, EDID management, and bi-directional PoC. It extends 4K@60Hz up to 394ft / 120m and 1080p@60Hz up to 492ft / 150m over a single CAT6 cable.
The UHD-EXB400UR-K is useful for conference rooms, classrooms, control rooms, projector setups, USB camera setups, remote workstation control, commercial AV installations, and any setup where HDMI video and USB control need to be extended over one CAT cable.
IMPORTANT — UHD-EXB400UR-K Supports 4K@60Hz 4:4:4
The UHD-EXB400UR-K supports video resolutions up to 4K@60Hz 4:4:4.
Supported video features include:
| Feature | Support |
| 4K@60Hz 4:4:4 | Supported |
| 18Gbps bandwidth | Supported |
| HDMI 2.0b | Supported |
| HDCP 2.2 | Supported |
| HDR | Supported |
| HDR10 | Supported |
| HDR10+ | Supported |
| Dolby Vision | Supported |
| HLG | Supported |
To get 4K@60Hz 4:4:4, the HDMI source, display, HDMI cables, CAT6 cable, and source output settings must all support the required signal.
IMPORTANT — Maximum Distance Depends on Resolution
The UHD-EXB400UR-K supports different extension distances depending on resolution.
| Resolution | Maximum Distance |
| 4K@60Hz 4:4:4 | Up to 394ft / 120m |
| 1080p@60Hz | Up to 492ft / 150m |
For best performance, use high-quality CAT6 cable.
Poor cable quality, bad terminations, couplers, patch panels, or long HDMI cables may reduce distance or cause unstable video.
IMPORTANT — Use a Direct CAT6 Cable Connection
The UHD-EXB400UR-K should be connected directly from the Transmitter HDBT OUT to the Receiver HDBT IN.
Do not connect the HDBT cable through:
- Network switch
- Router
- Internet network
- LAN switch
- Standard Ethernet port
- Home or office data network
This is an HDBaseT extender, not an AV-over-IP extender.
The CAT6 cable is used as a direct HDBaseT signal path between the Transmitter and Receiver.
IMPORTANT — USB 2.0 KVM Is Supported
The UHD-EXB400UR-K supports USB 2.0 transmission.
Typical USB KVM setup:
| Location | Connection |
| Source side | Computer HDMI to Transmitter HDMI IN |
| Source side | Computer USB to Transmitter PC USB-B port |
| Display side | Keyboard, mouse, USB camera, or USB device to Receiver USB 2.0 ports |
| Display side | Receiver HDMI OUT to TV, monitor, or projector |
This allows USB devices at the Receiver side to communicate with the computer connected near the Transmitter.
The Receiver has two USB 2.0 ports. The manual notes that the maximum output current of a single USB 2.0 port is 500mA.
IMPORTANT — Bi-Directional PoC Is Supported
The UHD-EXB400UR-K supports bi-directional PoC.
Only one side needs the included DC 24V/1A locking power supply.
| Power Setup | Support |
| Power Transmitter only | Supported |
| Power Receiver only | Supported |
| Power both units | Not required |
| PoC direction | Bi-directional |
If one unit does not power on, check the power adapter, CAT6 cable, and HDBT connection.
IMPORTANT — Bi-Directional IR Is Supported
The UHD-EXB400UR-K supports bi-directional IR pass-through.
This means IR control can work in both directions:
| Direction | Use Case |
| Receiver side to Transmitter side | Control the HDMI source from the remote display location |
| Transmitter side to Receiver side | Control the remote display from the source location |
Typical source-control setup:
- Connect IR Receiver cable to IR IN on the Receiver
- Connect IR Blaster cable to IR OUT on the Transmitter
- Place the IR Receiver near the remote display
- Place the IR Blaster near the source device IR window
Typical display-control setup:
- Connect IR Receiver cable to IR IN on the Transmitter
- Connect IR Blaster cable to IR OUT on the Receiver
- Place the IR Receiver near the source-side control location
- Place the IR Blaster near the display IR window
The supported IR frequency is 20kHz to 60kHz.
IMPORTANT — EDID Management Is Included
The Transmitter includes an EDID DIP switch.
| EDID Mode | Function |
| COPY | Copies the EDID from the Receiver HDMI OUT display |
| STD | Uses default 1080p 2CH EDID |
The manual notes that COPY is the default setting.
Use EDID management if there is no video, incorrect resolution, or audio compatibility issue.
IMPORTANT — HDMI Audio Format Support
The UHD-EXB400UR-K supports HDMI audio formats including:
- LPCM 7.1CH
- Dolby TrueHD
- DTS-HD Master Audio
The connected source, display, AVR, or audio system must also support the selected audio format.
If audio does not work, test with PCM / Stereo output from the HDMI source.
Ports and Panel Layout
| Port / Switch / Indicator | Unit | Function |
| PWR LED | Transmitter | Red LED is on when Transmitter is powered |
| EDID DIP Switch | Transmitter | COPY or STD EDID mode |
| SERVICE | Transmitter | Firmware update port |
| DC 24V | Transmitter | Connect DC 24V/1A power adapter if powering from Transmitter side |
| HDBT OUT | Transmitter | Connect CAT6 cable to Receiver HDBT IN |
| Link Signal Indicator / Green | Transmitter | Shows HDBT connection status |
| Data Signal Indicator / Yellow | Transmitter | Shows HDMI / HDCP signal status |
| HDMI IN | Transmitter | Connect HDMI source device |
| IR IN | Transmitter | Connect IR Receiver cable |
| IR OUT | Transmitter | Connect IR Blaster cable |
| PC / USB-B | Transmitter | Connect to PC for USB KVM transmission |
| Power LED | Receiver | Power LED is on when Receiver is powered |
| SERVICE | Receiver | Firmware update port |
| DC 24V | Receiver | Connect DC 24V/1A power adapter if powering from Receiver side |
| HDBT IN | Receiver | Connect CAT6 cable from Transmitter HDBT OUT |
| Link Signal Indicator / Green | Receiver | Shows HDBT connection status |
| Data Signal Indicator / Yellow | Receiver | Shows HDMI / HDCP signal status |
| HDMI OUT | Receiver | Connect HDMI display |
| IR IN | Receiver | Connect IR Receiver cable |
| IR OUT | Receiver | Connect IR Blaster cable |
| USB 2.0 Ports | Receiver | Connect USB 2.0 devices |
Step-by-Step Setup
- Connect the HDMI source device to HDMI IN on the Transmitter.
Examples include a desktop PC, laptop, Blu-ray player, media player, cable box, DVR, NVR, or HDMI matrix output. - Connect HDBT OUT on the Transmitter to HDBT IN on the Receiver using CAT6 cable.
- Connect HDMI OUT on the Receiver to the remote display.
- Connect the included DC 24V/1A locking power supply to either the Transmitter or Receiver.
- If using USB KVM, connect the computer to the Transmitter PC USB-B port.
- Connect USB devices such as keyboard, mouse, or USB camera to the Receiver USB 2.0 ports.
- If using IR control, connect the IR Receiver and IR Blaster cables based on the direction of control needed.
- Set EDID to COPY or STD depending on the setup.
- Power on the HDMI source, display, Transmitter, Receiver, and USB devices.
- Check the power, link, and data signal indicators.
- Test video, audio, USB control, and IR control.
CAT Cable Requirement — Critical
Use high-quality CAT6 cable.
| Resolution | Cable Type | Maximum Distance |
| 4K@60Hz 4:4:4 | CAT6 | Up to 394ft / 120m |
| 1080p@60Hz | CAT6 | Up to 492ft / 150m |
Poor CAT6 cable may cause:
- No picture
- Flickering
- Black screen
- Poor link signal indicator status
- HDBaseT link failure
- Audio dropouts
- USB KVM issues
- IR control issues
- 4K@60Hz not working
Use a direct CAT6 cable run whenever possible.
HDMI Cable Requirement — Critical
Use HDMI cables rated for 18Gbps when using 4K@60Hz 4:4:4.
Poor HDMI cables may cause:
- No signal
- Flickering
- Black screen
- HDR issues
- Audio dropouts
- HDCP handshake issues
- Wrong resolution
For troubleshooting, test the HDMI source directly with the display before using the extender.
Power Requirement — Critical
The UHD-EXB400UR-K uses one DC 24V/1A locking power supply.
| Unit | Power Requirement |
| Transmitter | DC 24V/1A, or powered by PoC |
| Receiver | DC 24V/1A, or powered by PoC |
Only one side needs to be powered because PoC sends power to the other unit through the CAT6 cable.
Understanding the Transmitter
The Transmitter is installed near the HDMI source or computer.
It has:
- HDMI IN
- HDBT OUT
- PC USB-B port
- IR IN and IR OUT
- EDID DIP switch
- SERVICE firmware port
- DC 24V power input
- Power LED
- Link Signal Indicator
- Data Signal Indicator
The Transmitter sends HDMI, USB, IR, and power through the CAT6 cable to the Receiver.
Understanding the Receiver
The Receiver is installed near the remote display.
It has:
- HDBT IN
- HDMI OUT
- Two USB 2.0 ports
- IR IN and IR OUT
- SERVICE firmware port
- DC 24V power input
- Power LED
- Link Signal Indicator
- Data Signal Indicator
The Receiver outputs HDMI to the display and provides USB ports for remote USB devices.
Understanding USB KVM
USB KVM allows the user to control a source computer from the Receiver side.
Common USB devices include:
- Keyboard
- Mouse
- USB camera
- USB control device
- Basic USB 2.0 peripheral
The USB device connects to the Receiver, while the PC connects to the Transmitter through the USB-B port.
Understanding Bi-Directional IR
Bi-directional IR lets remote control signals travel both ways through the extender.
Use the IR Receiver cable where the remote control will be pointed.
Use the IR Blaster cable near the device being controlled.
The manual lists IR working distance as:
| IR Receiver Angle | Working Distance |
| ±45° | 0–5m |
| ±90° | 0–8m |
Do not swap IR Receiver and IR Blaster cables because their pin definitions are different.
Understanding Signal Indicators
| Indicator | Status | Meaning |
| Link Signal Green | Illuminating | Transmitter and Receiver are in good connection status |
| Link Signal Green | Flashing | Transmitter and Receiver are in poor connection status |
| Link Signal Green | Dark | Transmitter and Receiver are not connected |
| Data Signal Yellow | Illuminating | HDMI signal with HDCP |
| Data Signal Yellow | Flashing | HDMI signal without HDCP |
| Data Signal Yellow | Dark | No HDMI signal |
Use these indicators to troubleshoot CAT cable, HDBaseT link, HDCP, and HDMI input issues.
Supported Video and Audio
The UHD-EXB400UR-K supports video formats including:
| Supported Video |
| Up to 4K@60Hz 4:4:4 |
| RGB 4:4:4 |
| YCbCr 4:4:4 |
| YCbCr 4:2:2 |
| YCbCr 4:2:0 |
| 8-bit at 4K60 |
| 8-bit / 10-bit / 12-bit at 1080p |
| 8-bit / 10-bit / 12-bit at 4K24/30 |
| HDR |
| HDR10 |
| HDR10+ |
| Dolby Vision |
| HLG |
Supported audio formats include:
| Supported HDMI Audio |
| LPCM 7.1CH |
| Dolby TrueHD |
| DTS-HD Master Audio |
Supported Technical Specifications
| Specification | Support |
| HDMI Version | HDMI 2.0b |
| HDCP Version | HDCP 2.2 |
| USB Compliance | USB 2.0 |
| Video Bandwidth | 18Gbps |
| Maximum Resolution | 4K@60Hz 4:4:4 |
| HDR | HDR, HDR10, HDR10+, Dolby Vision, HLG |
| 4K@60Hz Distance | Up to 394ft / 120m |
| 1080p@60Hz Distance | Up to 492ft / 150m |
| CAT Cable | CAT6 |
| USB KVM | Supported |
| USB Ports on Receiver | 2 x USB 2.0 |
| USB Output Current | Up to 500mA per USB port |
| IR | Bi-directional IR |
| IR Frequency | 20kHz–60kHz |
| EDID | COPY / STD |
| PoC | Bi-directional PoC |
| Power Supply | DC 24V/1A locking power supply |
| Power Consumption | 13.2W max |
| Housing | Metal enclosure |
| Color | Black |
| Dimensions | 140mm x 65mm x 18mm |
| Weight | Transmitter 245g; Receiver 249g |
| Operating Temperature | 0°C to 40°C / 32°F to 104°F |
| Storage Temperature | -20°C to 60°C / -4°F to 140°F |
| Relative Humidity | 20–90% RH, non-condensing |
What Source Devices Is the UHD-EXB400UR-K Compatible With?
The UHD-EXB400UR-K is compatible with HDMI source devices such as:
- Desktop PCs
- Laptops with HDMI output
- Blu-ray players
- Cable boxes
- Satellite receivers
- Streaming devices
- Media players
- DVRs
- NVRs
- HDMI matrix outputs
- HDMI switch outputs
For USB KVM, the computer must also connect to the Transmitter PC USB-B port.
What Displays Is the UHD-EXB400UR-K Compatible With?
The UHD-EXB400UR-K can connect to HDMI displays such as:
- 4K TVs
- 1080p TVs
- Projectors
- Monitors
- Commercial displays
- Conference room displays
- Classroom displays
- Control room displays
- Remote workstation displays
For 4K@60Hz, the display must support 4K@60Hz input.
What USB Devices Is the UHD-EXB400UR-K Compatible With?
The Receiver USB 2.0 ports can connect to USB devices such as:
- Keyboard
- Mouse
- USB camera
- USB control devices
- Basic USB 2.0 peripherals
For best reliability, avoid USB devices that require more than 500mA from a single USB port.
Frequently Asked Questions
Q: What is the OREI UHD-EXB400UR-K used for?
A: The UHD-EXB400UR-K is used to extend 4K@60Hz HDMI video, HDMI audio, USB 2.0 KVM, IR, and power over a single CAT6 cable using HDBaseT technology.
Q: Does the UHD-EXB400UR-K support 4K@60Hz?
A: Yes. It supports up to 4K@60Hz 4:4:4.
Q: Does it support 8K?
A: No. It supports up to 4K@60Hz.
Q: Does it support 4K@120Hz?
A: No. It does not support 4K@120Hz.
Q: What HDMI version does it support?
A: It supports HDMI 2.0b.
Q: What HDCP version does it support?
A: It supports HDCP 2.2.
Q: What video bandwidth does it support?
A: It supports 18Gbps video bandwidth.
Q: How far can it extend 4K@60Hz?
A: It extends 4K@60Hz 4:4:4 up to 394ft / 120m over CAT6 cable.
Q: How far can it extend 1080p@60Hz?
A: It extends 1080p@60Hz up to 492ft / 150m over CAT6 cable.
Q: What CAT cable should I use?
A: Use high-quality CAT6 cable.
Q: Can I connect it through a network switch?
A: No. The HDBT OUT and HDBT IN ports should be connected directly with CAT6 cable.
Q: Is this AV over IP?
A: No. This is an HDBaseT extender, not an AV-over-IP extender.
Q: Does it support USB KVM?
A: Yes. It supports USB 2.0 transmission.
Q: Where do I connect the computer for USB KVM?
A: Connect the computer to the Transmitter PC USB-B port.
Q: Where do I connect the keyboard and mouse?
A: Connect the keyboard and mouse to the Receiver USB 2.0 ports.
Q: Can I connect a USB camera?
A: Yes. The application example shows a USB camera connected at the Receiver side.
Q: What is the maximum USB current?
A: The manual lists a maximum output current of 500mA per USB 2.0 port.
Q: Does it support PoC?
A: Yes. It supports bi-directional PoC.
Q: Do both units need separate power adapters?
A: No. Only one unit needs the included DC 24V/1A locking power supply. The other unit is powered through the CAT6 cable.
Q: Can the power adapter connect to either Transmitter or Receiver?
A: Yes. The power adapter can be connected to either unit.
Q: Does it support IR control?
A: Yes. It supports bi-directional IR pass-through.
Q: Which IR cable goes where for source control?
A: Connect the IR Receiver to Receiver IR IN and the IR Blaster to Transmitter IR OUT.
Q: Which IR cable goes where for display control?
A: Connect the IR Receiver to Transmitter IR IN and the IR Blaster to Receiver IR OUT.
Q: Does it support EDID management?
A: Yes. The Transmitter has a COPY / STD EDID DIP switch.
Q: What does EDID COPY do?
A: COPY copies the EDID from the display connected to Receiver HDMI OUT.
Q: What does EDID STD do?
A: STD uses the default 1080p 2CH EDID.
Q: Does it support HDR?
A: Yes. It supports HDR, HDR10, HDR10+, Dolby Vision, and HLG.
Q: What audio formats are supported?
A: It supports LPCM 7.1CH, Dolby TrueHD, and DTS-HD Master Audio.
Q: What should I do if there is no video?
A: Check power, HDMI source output, HDMI cables, CAT6 cable, HDBT connection, EDID setting, and the Link Signal and Data Signal indicators.
Q: What should I do if the Link Signal indicator is flashing?
A: The connection between Transmitter and Receiver is poor. Check CAT6 cable quality, terminations, cable length, and direct connection.
Q: What should I do if the Link Signal indicator is dark?
A: The Transmitter and Receiver are not connected. Check the CAT6 cable and confirm HDBT OUT is connected to HDBT IN.
Q: What should I do if the Data Signal indicator is dark?
A: No HDMI signal is detected. Check the HDMI source, HDMI cable, and source output setting.
Q: What should I do if 4K@60Hz does not work?
A: Use HDMI cables rated for 18Gbps, use high-quality CAT6 cable within 394ft / 120m, confirm the source and display support 4K@60Hz, and test with 1080p first.
Q: What should I do if USB KVM does not work?
A: Confirm the computer is connected to the Transmitter PC USB-B port, the USB devices are connected to the Receiver USB 2.0 ports, and the CAT link is active.
Q: What should I do if a USB device does not power on?
A: Check whether the USB device requires more than 500mA. Use a lower-power USB device or a powered USB hub if needed.
Q: What should I do if IR control does not work?
A: Confirm the IR Receiver and IR Blaster are connected in the correct direction and that the IR Blaster is placed near the controlled device’s IR sensor.
Q: Does the UHD-EXB400UR-K need external power?
A: Yes. Connect the included DC 24V/1A locking power supply to either the Transmitter or Receiver.
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