UHD-EXB400R-K Overview and Use Cases

What Is the UHD-EXB400R-K?

The OREI UHD-EXB400R-K is an 18Gbps HDMI over HDBaseT Extender with Bi-directional IR designed to extend HDMI video, audio, RS-232, IR, and CEC signals over a single CAT cable.

It supports video resolutions up to 4K@60Hz 4:4:4, 18Gbps bandwidth, HDCP 2.2 / HDCP 1.4, HDR, HDR10+, Dolby Vision, HLG, HDMI 3D formats, and PC resolutions up to 1920 x 1200.

The system includes a Transmitter and Receiver. The Transmitter connects to the HDMI source and sends the signal through one CAT5e/6 cable to the Receiver. The Receiver connects to the remote HDMI display and outputs the HDMI signal.

The Transmitter includes one HDMI loop output for a local display. The Receiver includes a 3.5mm analog audio output for de-embedded stereo audio. The extender also supports bi-directional IR, RS-232 pass-through, CEC pass-through, and PoC power, allowing either the Transmitter or Receiver to be powered by the included 24V/1A adapter.

The UHD-EXB400R-K is useful for home theater systems, conference rooms, classrooms, houses of worship, control rooms, commercial AV installations, digital signage, projector installations, AV racks, and long HDMI runs where a single CAT cable is preferred.

IMPORTANT — UHD-EXB400R-K Is an HDMI over HDBaseT Extender

The UHD-EXB400R-K extends HDMI using one CAT5e/6 cable.

This product is not an HDMI switch, splitter, or matrix.

It is designed to extend one HDMI source to one remote HDMI display over HDBaseT.

IMPORTANT — Transmission Distance Depends on Resolution

The maximum CAT cable distance depends on the signal resolution.

Use good-quality CAT5e or CAT6 cable.

Poor cable quality, bad terminations, loose RJ45 connectors, or damaged cable runs can reduce distance and cause unstable signal.

IMPORTANT — Supports 4K@60Hz 4:4:4

The UHD-EXB400R-K supports high-bandwidth HDMI video.

To get 4K@60Hz 4:4:4, the HDMI source, display, HDMI cables, CAT cable, and EDID / display capability must all support the required signal.

IMPORTANT — HDR, HDR10+, Dolby Vision, and HLG Are Supported

The UHD-EXB400R-K supports HDR video formats.

For HDR to work, the HDMI source, display, HDMI cables, and CAT cable connection must all support the selected HDR format.

IMPORTANT — HDMI Loop Output Is Supported on the Transmitter

The Transmitter includes one HDMI loop output.

The Transmitter HDMI OUT loop port lets you connect a local display near the HDMI source while also extending the same signal to the remote Receiver.

This is useful for AV racks, control rooms, source monitoring, and installations where both local and remote displays are needed.

IMPORTANT — Receiver Supports Analog Audio De-Embedding

The Receiver includes a 3.5mm AUDIO OUT port.

Use the Receiver AUDIO OUT port when audio needs to be sent to powered speakers, an amplifier, or another stereo audio device near the display.

For best compatibility with the 3.5mm analog output, set the HDMI source audio to PCM 2.0 or Stereo.

IMPORTANT — HDMI Audio Formats Supported

The UHD-EXB400R-K supports multiple HDMI audio formats.

The HDMI output can pass supported HDMI audio formats.

The Receiver L/R analog audio output supports PCM 2.0 only.

IMPORTANT — PoC Power Is Supported

The UHD-EXB400R-K supports PoC, also called Power over Cable.

The manual notes that either the Transmitter or Receiver can be powered by the 24V/1A power adapter, and the other unit does not need a separate power supply.

For troubleshooting, connect the included 24V/1A power adapter to one side and confirm both units power on.

IMPORTANT — Bi-Directional IR Control Is Supported

The UHD-EXB400R-K supports two-way IR pass-through.

The package includes:

Use the IR Receiver cable where the remote control will be used.

Use the IR Blaster cable near the device that needs to receive the IR command.

IMPORTANT — IR Range and Angle

The manual’s IR system diagram notes that the IR remote sends signal at a distance of approximately 0–5m / 0–8m with an angle of ±45° in the vertical direction.

If IR control is unreliable, reduce the distance, improve the angle, and confirm the IR Blaster is placed directly near the device IR window.

IMPORTANT — RS-232 Pass-Through Is Supported

The UHD-EXB400R-K supports RS-232 command pass-through between the Transmitter and Receiver.

RS-232 commands can pass through from Transmitter to Receiver or from Receiver to Transmitter.

This is useful for projectors, displays, control processors, HDMI matrix systems, or other RS-232-controlled devices.

IMPORTANT — CEC Pass-Through Is Supported

The UHD-EXB400R-K supports CEC pass-through.

CEC behavior depends on the connected HDMI source, display, and their HDMI-CEC settings.

If devices turn on/off unexpectedly or switch inputs by themselves, check the CEC settings on the source and display.

IMPORTANT — Recommended HDMI Cable Lengths

The manual recommends using Premium High Speed HDMI cables.

For best reliability, use short, high-quality HDMI cables, especially for 4K60.

Ports and Panel Layout

Transmitter Panel

Receiver Panel

Understanding the LED Indicators

Use these indicators first when troubleshooting power, CAT cable connection, HDMI signal, or HDCP behavior.

Step-by-Step Setup

1. Place the Transmitter near the HDMI source device.
2. Place the Receiver near the HDMI display device.
3. Connect the HDMI source to the HDMI IN port on the Transmitter.

Examples include a Blu-ray player, DVD player, streaming device, game console, PC, laptop, cable box, satellite receiver, media player, HDMI matrix output, or AV receiver output.

1. If local monitoring is needed, connect the Transmitter HDMI OUT loop port to a local TV, monitor, projector, or display.
2. Connect the Receiver HDMI OUT port to the remote TV, monitor, projector, or display.
3. Connect a CAT5e or CAT6 cable between the Transmitter HDBT OUT port and Receiver HDBT IN port.
4. If using audio de-embedding, connect the Receiver AUDIO OUT port to an amplifier, powered speaker, or audio system using a 3.5mm stereo cable.
5. If using IR control, connect the IR Receiver and IR Blaster cables based on the control direction.
6. If using RS-232 pass-through, connect the RS-232 Phoenix connectors to the required control devices.
7. Connect the included 24V/1A locking power adapter to either the Transmitter or Receiver.
8. Power on the HDMI source and display.
9. Confirm the Power LED is on.
10. Confirm the Connection Signal Indicator is illuminating.
11. Confirm the Data Signal Indicator shows HDMI signal status.
12. Test video, audio, HDMI loop output, analog audio output, IR control, RS-232 pass-through, and CEC behavior.

CAT Cable Requirement — Critical

Use a good-quality CAT5e or CAT6 cable.

Poor CAT cable quality may cause:

• No picture
• Flickering
• Black screen
• Connection indicator flashing
• Connection indicator dark
• Data indicator dark
• Audio dropouts
• IR failure
• RS-232 pass-through failure
• HDCP handshake issues

For best performance, use a direct point-to-point CAT cable connection.

Avoid network switches, routers, patch panels, couplers, or damaged terminations during troubleshooting.

HDMI Cable Requirement — Critical

Use Premium High Speed HDMI cables.

Poor HDMI cables may cause:

• No picture
• Flickering
• Black screen
• Wrong resolution
• 4K60 failure
• HDR not working
• HDCP handshake issues
• Audio dropouts
• Data Signal Indicator not lighting correctly

For troubleshooting, test the HDMI source directly with the display before using the extender.

Audio Requirement — Critical

The Receiver AUDIO OUT supports PCM 2.0 analog audio.

If there is no audio from AUDIO OUT:

• Set the HDMI source audio to PCM 2.0 or Stereo.
• Check the 3.5mm audio cable.
• Confirm the amplifier or speaker is powered on and set to the correct input.
• Confirm the HDMI source is sending audio.
• Confirm the extender has an active HDMI signal.
• Test audio through the HDMI display first.

Dolby, DTS, and other multichannel formats may pass through HDMI, but the analog AUDIO OUT is listed as PCM 2.0.

IR Requirement — Critical

Use the correct IR cable placement.

If IR control does not work:

• Confirm IR IN and IR OUT are not reversed.
• Confirm the IR Blaster is aimed at the device IR window.
• Confirm the remote control battery is working.
• Confirm the remote is within the supported distance and angle.
• Test the IR control at short distance first.
• Confirm the CAT cable connection is stable.

RS-232 Requirement — Critical

RS-232 pass-through requires correct wiring.

If RS-232 control does not work:

• Check TX / RX / ground wiring.
• Confirm the Phoenix connector is seated correctly.
• Confirm the control device and controlled device use compatible settings.
• Test with a known working RS-232 command.
• Confirm the Connection Signal Indicator is illuminating.

Power Requirement — Critical

The UHD-EXB400R-K uses a 24V/1A locking power adapter and supports PoC.

If the units do not power on:

• Confirm the 24V/1A locking power adapter is connected to either the Transmitter or Receiver.
• Check that the power connector is fully seated and locked.
• Check the outlet.
• Confirm the Power LED is red.
• Try powering the opposite unit.
• Check the CAT cable connection if using PoC.

Surge protection is recommended.

Firmware Update Port

Both the Transmitter and Receiver include a SERVICE port.

Use the SERVICE port only when instructed by OREI support or when a confirmed firmware update is provided.

Understanding the Application Example

The application example shows the Transmitter connected to a Blu-ray/DVD source through HDMI IN. The Transmitter HDMI OUT loop port connects to a local HDTV. A CAT5e/CAT6 cable connects the Transmitter to the Receiver.

On the Receiver side, HDMI OUT connects to a remote HDTV, and AUDIO OUT connects to speakers. IR Receiver and IR Blaster cables are shown for two-way control, allowing the TV remote or Blu-ray remote to send IR commands across the extender.

This shows the main use case: one HDMI source can be extended to a remote display while still providing local HDMI loop output, receiver-side stereo audio output, bi-directional IR control, RS-232 pass-through, CEC pass-through, and PoC power.

Supported Technical Specifications

Package Contents

What HDMI Source Devices Is the UHD-EXB400R-K Compatible With?

The UHD-EXB400R-K can connect to HDMI source devices such as:

• Blu-ray players
• DVD players
• Streaming devices
• Media players
• PCs
• Laptops
• Game consoles
• Cable boxes
• Satellite receivers
• HDMI matrix outputs
• HDMI switch outputs
• AV receiver HDMI outputs
• Cameras with HDMI output

The source must output a supported HDMI signal up to 4K@60Hz 4:4:4.

What Displays Is the UHD-EXB400R-K Compatible With?

The UHD-EXB400R-K can connect to HDMI display devices such as:

• 4K TVs
• UHD TVs
• HDMI monitors
• HDMI projectors
• AV receivers with HDMI input
• Commercial displays
• Classroom displays
• Conference room displays
• Control room displays
• Digital signage displays

The connected display must support the selected HDMI resolution, audio format, and HDCP requirements.

Frequently Asked Questions

Q: What is the UHD-EXB400R-K used for?
A: It is used to extend HDMI video and audio over one CAT5e/6 cable using HDBaseT.

Q: Is the UHD-EXB400R-K an HDMI over HDBaseT extender?
A: Yes. It is an 18Gbps HDMI over HDBaseT Extender with Bi-directional IR.

Q: How far can it extend HDMI?
A: It can extend 4K2K up to 394ft / 120m and 1080p up to 492ft / 150m.

Q: What cable should I use between the Transmitter and Receiver?
A: Use a good-quality CAT5e or CAT6 cable.

Q: Does it support 4K@60Hz?
A: Yes. It supports up to 4K2K@50/60Hz 4:4:4.

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

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

Q: Does it support HDR?
A: Yes. HDR, HDR10+, Dolby Vision, and HLG are supported.

Q: Does it support 3D?
A: Yes. All HDMI 3D TV formats are supported.

Q: Does it support PC resolutions?
A: Yes. PC resolutions up to 1920 x 1200 are supported.

Q: Does the Transmitter have HDMI loop output?
A: Yes. The Transmitter has one HDMI loop output for a local display.

Q: What is the HDMI loop output used for?
A: It allows a local display near the source to show the same HDMI signal while the signal is also extended to the Receiver.

Q: Does the Receiver have audio extraction?
A: Yes. The Receiver has a 3.5mm stereo AUDIO OUT port.

Q: What audio format does AUDIO OUT support?
A: The L/R audio output supports PCM 2.0.

Q: Does HDMI pass Dolby or DTS audio?
A: Yes. HDMI supports LPCM, Dolby Digital, Dolby TrueHD, Dolby Digital Plus, DTS-ES, DTS HD Master, DTS HD-HRA, and DTS:X.

Q: Why is there no sound from the 3.5mm AUDIO OUT port?
A: Set the HDMI source audio output to PCM 2.0 or Stereo, then check the 3.5mm cable and connected audio device.

Q: Does it support PoC?
A: Yes. It supports Power over Cable.

Q: Do both units need power adapters?
A: No. Because PoC is supported, either the Transmitter or Receiver can be powered by the 24V/1A adapter, and the other unit can receive power over the CAT cable.

Q: What power adapter does it use?
A: It uses a DC 24V/1A locking power adapter.

Q: Does it support IR control?
A: Yes. It supports bi-directional IR control.

Q: What IR frequency is supported?
A: The package lists a 20–60kHz IR Receiver cable.

Q: Does it support RS-232 pass-through?
A: Yes. RS-232 pass-through is supported in both directions.

Q: Does it support CEC?
A: Yes. CEC pass-through is supported.

Q: What does the Connection Signal Indicator mean?
A: Illuminating means good connection, flashing means poor connection, and dark means the Transmitter and Receiver are not connected.

Q: What does the Data Signal Indicator mean?
A: Illuminating means HDMI signal with HDCP, flashing means HDMI signal without HDCP, and dark means no HDMI signal.

Q: What should I do if there is no picture?
A: Check power, HDMI cables, CAT cable, source resolution, display input, and the connection/data LEDs. Try a lower resolution and test the HDMI source directly with the display.

Q: What should I do if the Connection Signal Indicator is flashing?
A: The Transmitter and Receiver are in poor connection status. Check the CAT cable, RJ45 terminations, cable length, and avoid couplers or damaged cables.

Q: What should I do if the Connection Signal Indicator is dark?
A: The units are not connected. Check the CAT cable connection between HDBT OUT and HDBT IN and confirm both units have power.

Q: What should I do if the Data Signal Indicator is dark?
A: No HDMI signal is detected. Check the HDMI source, HDMI cable, source power, and HDMI IN connection.

Q: What should I do if the Data Signal Indicator is flashing?
A: The HDMI signal is detected without HDCP. This may be normal for non-HDCP sources. If protected content fails, check HDCP compatibility.

Q: What should I do if 4K60 does not work?
A: Use Premium High Speed HDMI cables, check CAT cable quality, confirm both display and source support 4K60, and verify the cable distance is within the 4K limit.

Q: What HDMI cable length is recommended for 4K60?
A: Up to 16ft / 5m for HDMI IN / OUT.

Q: What HDMI cable length is recommended for 1080p60?
A: Up to 50ft / 15m for HDMI IN / OUT.

Q: What should I do if IR does not work?
A: Confirm the IR Receiver and IR Blaster are connected to the correct IR IN / IR OUT ports, aim the IR Blaster at the device IR window, and test at short distance.

Q: What should I do if RS-232 does not work?
A: Check TX / RX / ground wiring, Phoenix connector seating, control device settings, and CAT cable connection status.

Q: Does the unit have a firmware update port?
A: Yes. Both the Transmitter and Receiver have SERVICE ports for firmware updates.

Q: What is included in the package?
A: The package includes the Transmitter, Receiver, IR Blaster cable, IR Receiver cable, four mounting ears, two Phoenix connectors, one 24V/1A locking power adapter, and one user manual.

Q: Does the UHD-EXB400R-K need external power?
A: Yes. Connect the included 24V/1A locking power adapter to either the Transmitter or Receiver. The other unit can receive power through PoC.