UHD88-EXB400R-K Overview and Use Cases

What Is the UHD88-EXB400R-K?

The OREI UHD88-EXB400R-K is an 18Gbps 8x8 HDBaseT Matrix extender system. It connects up to eight HDMI source devices to eight output zones, with each output available through both a local HDMI output and a mirrored HDBaseT output for long-distance display connection.

The kit includes one UHD88-EXB400R-K Matrix and eight HDBaseT Receivers. HDMI sources connect to HDMI INPUT 1–8 on the Matrix, local displays connect to HDMI OUTPUT 1–8, and remote displays connect through the included HDBaseT Receivers using CAT5e / CAT6 / CAT7 cable.

The UHD88-EXB400R-K supports HDMI 2.0b and HDCP 2.2 / 1.x, with a video bandwidth of 18Gbps. It supports video resolutions up to 4K@60Hz 4:4:4, HDR10, HDR10+, Dolby Vision, HLG, 4K to 1080p downscaling on each output, HDMI and HDBaseT mirrored outputs, IR matrix function, bi-directional IR, RS-232, LAN, Web GUI control, EDID management, CEC control, audio de-embedding through coaxial and balanced analog audio outputs, and 24V PoC on all HDBaseT ports. It extends 4K video up to 120m / 394ft and 1080p video up to 150m / 492ft over a single CAT5e / CAT6 / CAT7 cable.

The UHD88-EXB400R-K is useful for sports bars, restaurants, churches, conference rooms, classrooms, hotels, retail displays, control rooms, multi-room AV systems, and commercial installations where eight HDMI sources need to be routed to multiple local and remote displays.

IMPORTANT — UHD88-EXB400R-K Is an 8x8 HDBaseT Matrix

The UHD88-EXB400R-K routes eight HDMI sources to eight output zones.

This product routes HDMI sources. It does not create extended desktop screens from one computer unless the computer itself outputs multiple independent HDMI signals.

IMPORTANT — Each HDMI Output Is Mirrored to an HDBaseT Output

Each output zone includes:

• One local HDMI output on the Matrix
• One mirrored HDBaseT output to a Receiver

This means HDMI OUTPUT 1 and HDBT OUTPUT 1 show the same selected source. HDMI OUTPUT 2 and HDBT OUTPUT 2 show the same selected source, and so on.

The HDMI and HDBaseT output in the same zone cannot show different sources because they are mirrored.

IMPORTANT — Supports 4K@60Hz 4:4:4

The UHD88-EXB400R-K supports video resolutions up to 4K@60Hz 4:4:4.

Supported video features include:

To get 4K@60Hz 4:4:4, the HDMI sources, displays, HDMI cables, CAT cable, EDID settings, and scaler settings must all support the required signal.

IMPORTANT — Maximum Distance Depends on Resolution

The UHD88-EXB400R-K supports long-distance HDBaseT extension over CAT5e / CAT6 / CAT7 cable.

For best performance, use high-quality CAT6 / CAT6a / CAT7 cable with proper termination.

Poor cable quality, damaged connectors, couplers, patch panels, or poor terminations may reduce distance or cause signal instability.

IMPORTANT — Use Direct CAT Cable Connections

Each HDBaseT Receiver should be connected directly to the matching HDBaseT output on the Matrix.

Do not connect the HDBaseT outputs through:

• Network switch
• Router
• Internet network
• LAN switch
• Standard Ethernet port
• Home or office data network

This product is an HDBaseT Matrix extender system, not an AV-over-IP system.

IMPORTANT — 4K to 1080p Downscaling Is Supported

Each HDMI output supports independent 4K to 1080p downscaling.

Scaler modes include:

This is useful when the system has mixed 4K and 1080p displays.

Example:

IMPORTANT — 24V PoC Powers the HDBaseT Receivers

The UHD88-EXB400R-K supports 24V PoC on all HDBaseT ports.

This means the Matrix can power the HDBaseT Receivers through the CAT cable.

The Matrix uses AC 100–240V 50/60Hz power input.

If a Receiver does not power on, check the Matrix power, CAT cable, HDBaseT output connection, and Receiver power LED.

IMPORTANT — Audio De-Embedding Is Supported

The UHD88-EXB400R-K supports audio de-embedding through coaxial and balanced analog audio outputs.

The Matrix has eight groups of coaxial and balanced analog audio mirrored output ports.

AUDIO OUT 1–8 follows the video output of OUTPUT 1–8.

If analog audio does not work, set the HDMI source audio output to PCM / Stereo.

IMPORTANT — HDMI Audio Pass-Through Supports up to 7.1CH

The UHD88-EXB400R-K supports HDMI audio pass-through up to 7.1CH.

Supported HDMI audio formats include:

• LPCM 2.0 / 2.1 / 5.1 / 6.1 / 7.1
• Dolby Digital
• Dolby TrueHD
• Dolby Digital Plus
• DTS-ES
• DTS-HD Master
• DTS-HD HRA
• DTS:X

The connected HDMI source, display, AVR, soundbar, or audio system must also support the selected audio format.

IMPORTANT — IR Matrix Function Is Supported

The UHD88-EXB400R-K supports IR matrix control.

IR behavior depends on the direction:

At the Matrix side, IR IN 1 sends to IR OUT on HDBaseT Receiver 1, IR IN 3 sends to IR OUT on HDBaseT Receiver 3, and IR IN ALL sends to all Receiver IR OUT ports.

At the Receiver side, IR follows the selected video source. For example, if Receiver 1 is showing HDMI INPUT 2, then IR from Receiver 1 sends to IR OUT 2 on the Matrix. If Receiver 5 is showing HDMI INPUT 4, then IR from Receiver 5 sends to IR OUT 4 on the Matrix.

IMPORTANT — Bi-Directional IR Is Supported

The HDBaseT Receivers include both IR IN and IR OUT.

This allows:

Typical source-control setup:

• Connect IR Receiver cable to IR IN on the HDBaseT Receiver.
• Place the IR Receiver near the remote display.
• Connect IR Blaster cable to the matching IR OUT port on the Matrix.
• Place the IR Blaster near the HDMI source device’s IR window.

Typical display-control setup:

• Connect IR Receiver cable to the matching IR IN port on the Matrix.
• Connect IR Blaster cable to IR OUT on the HDBaseT Receiver.
• Place the IR Blaster near the remote display’s IR window.

IMPORTANT — RS-232 Pass-Through Is Supported

Each HDBaseT Receiver includes RS-232.

RS-232 can be used to transmit commands between the Matrix and the HDBaseT Receiver.

Common RS-232 uses include:

• Display control
• Projector control
• Control processor integration
• Automation systems
• Matrix command control
• Remote device command pass-through

Default serial settings:

The RS-232 command list also includes HDBT UART settings for baud rate, data length, parity, and data transmission.

IMPORTANT — Multiple Control Methods Are Supported

The UHD88-EXB400R-K can be controlled in several ways.

This makes the Matrix suitable for both simple installations and professional AV control systems.

IMPORTANT — Web GUI Control Is Supported

The UHD88-EXB400R-K supports browser-based Web GUI control.

The manual lists the default IP address as:

Default login credentials:

The Web GUI can be used for:

• Input/output switching
• Preset saving and recall
• Input naming
• Output naming
• EDID management
• Scaler mode settings
• Stream on/off
• CEC control
• Network settings
• Password changes
• Panel lock
• Beep on/off
• LCD settings
• Serial baud rate
• Firmware update
• Factory reset
• Reboot

IMPORTANT — Front Panel OLED Screen Is Included

The front panel includes an OLED screen.

The OLED screen can display:

• Matrix switching status
• Input / output port
• EDID
• Baud rate
• IP address

The front panel also includes MENU, ENTER, UP, DOWN, POWER, LOCK, input buttons, and output buttons.

IMPORTANT — Front Panel Switching Is Supported

To route a source to an output from the front panel:

1. Press the output button 1–8 first.
2. Press the input button 1–8.
3. The selected input source will be routed to that output.

Example:

The LOCK button can lock the front panel buttons except the power button.

IMPORTANT — EDID Management Is Included

The UHD88-EXB400R-K includes 21 factory-defined EDID settings, 2 user-defined EDID modes, and 16 copy EDID modes.

EDID can be set through:

• Front panel buttons
• RS-232 command
• Web GUI

EDID options include:

Use EDID management when there is no video, wrong resolution, audio compatibility issue, HDR issue, Dolby Vision issue, or mixed display capability.

IMPORTANT — CEC Control Is Supported

The UHD88-EXB400R-K supports CEC control through Web GUI and RS-232.

CEC functions include:

• Input source power on/off
• Input source menu control
• Play / pause / stop
• Previous / next
• Fast forward / rewind
• Volume up / down / mute
• HDMI output display power on/off
• HDBT output display power on/off
• Active source control

CEC behavior depends on the connected HDMI source, display, HDMI cable, and device settings.

If CEC does not work reliably, use IR or RS-232 control where available.

IMPORTANT — Premium High Speed HDMI Cables Are Recommended

The manual recommends Premium High Speed HDMI cables.

Poor HDMI cables may cause:

• No video
• Flickering
• Black screen
• HDR issues
• Dolby Vision issues
• HDCP handshake issues
• No signal on HDMI outputs
• No signal on HDBaseT outputs

Ports and Panel Layout

Step-by-Step Setup

1. Connect HDMI source devices to HDMI INPUT 1–8 on the Matrix.
   Examples include Blu-ray players, cable boxes, streaming devices, PCs, laptops, game consoles, DVRs, NVRs, or TV boxes.
2. Connect local displays to HDMI OUTPUT 1–8 if local HDMI outputs are needed.
3. Connect HDBT OUTPUT 1 on the Matrix to HDBT IN on Receiver 1 using CAT5e / CAT6 / CAT7 cable.
4. Repeat for HDBT OUTPUT 2 through HDBT OUTPUT 8.
5. Connect each Receiver HDMI OUT to its remote display.
6. Connect the AC 100–240V power cable to the Matrix.
7. Turn on the Matrix using the rear power switch.
8. If using audio de-embedding, connect the Matrix coaxial or balanced analog AUDIO OUT ports to an amplifier, audio processor, or speaker system.
9. If using Receiver-side audio output, connect Receiver AUDIO OUT to a speaker or audio device.
10. If using source IR control from the display side, connect IR Receivers to Receiver IR IN ports and IR Blasters to Matrix IR OUT ports.
11. If using display IR control from the Matrix side, connect IR Receivers to Matrix IR IN ports and IR Blasters to Receiver IR OUT ports.
12. If using RS-232 control, connect the Matrix RS-232 port to the control system or PC.
13. If using RS-232 pass-through, connect the Receiver RS-232 port to the remote device.
14. If using Web GUI / LAN control, connect the TCP/IP port to the network or control PC.
15. Power on sources, displays, audio devices, and control devices.
16. Use the front panel, IR remote, RS-232, LAN, or Web GUI to route inputs to outputs.
17. Set EDID and scaler settings if needed.
18. Test each HDMI output, HDBaseT output, audio output, IR control path, RS-232, CEC, and Web GUI control.

CAT Cable Requirement — Critical

Use high-quality CAT5e / CAT6 / CAT7 cable.

Poor CAT cable may cause:

• No video
• Flickering
• Black screen
• Receiver not powering on
• Poor connection signal indicator
• HDBaseT link failure
• Audio dropouts
• IR control issues
• RS-232 issues
• 4K@60Hz not working
• Signal loss at longer distances

Use direct CAT cable runs whenever possible.

HDMI Cable Requirement — Critical

Use Premium High Speed HDMI cables, especially for 4K@60Hz.

Poor HDMI cables may cause:

• No picture
• Flickering
• Black screen
• HDR issues
• Dolby Vision issues
• Audio dropouts
• HDCP handshake issues
• No signal on HDMI outputs
• No signal on HDBaseT outputs

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

Power Requirement — Critical

The UHD88-EXB400R-K Matrix uses AC 100–240V 50/60Hz power.

If a Receiver does not power on, check Matrix power, CAT cable, HDBaseT output connection, and Receiver power LED.

Understanding the Matrix

The Matrix is installed near the HDMI sources and AV equipment.

It has:

• Eight HDMI inputs
• Eight HDMI local outputs
• Eight mirrored HDBaseT outputs
• Eight coaxial audio outputs
• Eight balanced analog audio outputs
• IR IN and IR OUT ports including ALL ports
• TCP/IP control port
• RS-232 control port
• OLED display
• Front panel input/output buttons
• MENU / ENTER / UP / DOWN controls
• LOCK button
• AC power input

The Matrix routes any of the eight HDMI inputs to any of the eight output zones.

Understanding the HDBaseT Receiver

Each HDBaseT Receiver is installed near a remote display.

Each Receiver has:

• HDBT IN from the Matrix
• HDMI OUT to the display
• AUDIO OUT
• IR IN
• IR OUT
• RS-232
• SERVICE firmware update port
• Optional DC 24V input
• Power, connection, and data signal indicators

The Receiver receives HDMI over HDBaseT and outputs it to the connected display.

Understanding Matrix Routing

The UHD88-EXB400R-K can send any HDMI input to any output.

Examples:

This is useful when different rooms, screens, or display areas need different HDMI sources.

Understanding Mirrored HDMI and HDBaseT Outputs

Each output zone has one HDMI output and one HDBaseT output.

They mirror each other.

Example:

The HDMI and HDBaseT outputs in the same zone cannot show different sources.

Understanding 4K to 1080p Downscaling

Downscaling lets a 4K source work with a 1080p display on a selected output.

Use this when:

• A 4K source is connected
• Some displays are 4K
• Some displays are 1080p
• A 1080p display shows no signal from a 4K source

Set that output’s scaler mode to 4K to 1080p or Auto.

Understanding Audio De-Embedding

Audio de-embedding lets the Matrix output audio separately from the HDMI signal.

AUDIO OUT 1 follows OUTPUT 1, AUDIO OUT 2 follows OUTPUT 2, and so on.

Understanding IR Matrix Control

IR matrix control allows source or display control signals to travel through the Matrix system.

At the Matrix side, IR transmission is one-to-one.

At the Receiver side, IR follows the selected HDMI video route.

This is important in an 8x8 system because each output zone may be watching a different source.

Understanding Web GUI Control

The Web GUI lets installers control the Matrix from a browser.

Main Web GUI pages include:

Understanding Presets

The Matrix supports saved presets through the Web GUI and RS-232 commands.

Presets allow a full switching layout to be saved and recalled later.

Example:

Understanding EDID Management

EDID tells HDMI sources what video and audio format to output.

Use EDID when:

• There is no video
• Displays show the wrong resolution
• Audio does not work
• 4K@60Hz does not display correctly
• Dolby / DTS audio does not pass correctly
• Mixed display capabilities are connected
• HDR or Dolby Vision is not working correctly

The UHD88-EXB400R-K supports EDID presets, user-defined EDID, and copy EDID from HDMI or HDBT outputs.

Understanding RS-232 Control

RS-232 control allows professional AV systems or a PC to control the Matrix.

RS-232 can control:

• Power
• Reboot
• Factory reset
• Input/output routing
• Presets
• HDMI output stream
• HDBT output stream
• HDMI scaler mode
• HDBT scaler mode
• EDID
• CEC
• Network settings
• LCD settings
• Panel lock
• Beep
• Baud rate
• HDBT UART settings

Default baud rate is 115200.

Understanding Signal Indicators

Use these indicators to troubleshoot CAT cable, HDBaseT connection, HDMI signal, and HDCP status.

Supported Video and Audio

The UHD88-EXB400R-K supports video formats including:

Supported audio formats include:

Supported Technical Specifications

What Source Devices Is the UHD88-EXB400R-K Compatible With?

The UHD88-EXB400R-K is compatible with HDMI source devices such as:

• Blu-ray players
• DVD players
• Cable boxes
• Satellite receivers
• Streaming devices
• Media players
• Desktop PCs
• Laptops with HDMI output
• Game consoles
• DVRs
• NVRs
• TV boxes
• HDMI switch outputs
• HDMI matrix outputs

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

What Displays Is the UHD88-EXB400R-K Compatible With?

The UHD88-EXB400R-K can connect to HDMI displays such as:

• 4K TVs
• 1080p TVs
• Projectors
• Monitors
• Commercial displays
• Digital signage screens
• Classroom displays
• Conference room displays
• Church displays
• Restaurant TVs
• Bar displays
• Retail displays
• Local displays near the Matrix
• Remote displays through HDBaseT Receivers

For 4K@60Hz, the display must support 4K@60Hz input.

What Audio Devices Is the UHD88-EXB400R-K Compatible With?

The audio outputs can connect to:

• Amplifiers
• AV receivers
• Powered speakers
• Audio processors
• Distributed audio systems
• Conference room audio systems
• Restaurant audio systems
• Commercial audio systems

Use coaxial output for digital audio and balanced analog output for PCM stereo audio.

Frequently Asked Questions

Q: What is the OREI UHD88-EXB400R-K used for?
A: The UHD88-EXB400R-K is used to route eight HDMI sources to eight output zones, with each zone available locally through HDMI and remotely through a mirrored HDBaseT Receiver.

Q: Is the UHD88-EXB400R-K a matrix or splitter?
A: It is an 8x8 HDMI Matrix. It can route different sources to different outputs, unlike a simple splitter.

Q: How many HDMI inputs does it have?
A: It has eight HDMI inputs.

Q: How many HDMI outputs does it have?
A: It has eight HDMI outputs.

Q: How many HDBaseT outputs does it have?
A: It has eight mirrored HDBaseT outputs.

Q: How many Receivers are included?
A: Eight HDBaseT Receivers are included.

Q: What does mirrored HDBaseT output mean?
A: Each HDBaseT output mirrors the matching HDMI output. For example, HDMI OUTPUT 1 and HDBT OUTPUT 1 show the same selected source.

Q: Can HDMI OUTPUT 1 and HDBT OUTPUT 1 show different sources?
A: No. They are mirrored and show the same selected source.

Q: Can different outputs show different sources?
A: Yes. Each output zone can be assigned a different HDMI input.

Q: Can one source show on all outputs?
A: Yes. One HDMI input can be routed to all outputs.

Q: Does the UHD88-EXB400R-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 and HDCP 1.x.

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

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

Q: How far can the HDBaseT outputs extend HDMI?
A: The HDBaseT outputs extend 4K video up to 120m / 394ft and 1080p video up to 150m / 492ft.

Q: What CAT cable should I use?
A: Use high-quality CAT5e / CAT6 / CAT7 cable.

Q: Can I connect the HDBaseT outputs through a network switch?
A: No. The HDBaseT outputs should connect directly to the included HDBaseT Receivers.

Q: Is this AV over IP?
A: No. This is an HDBaseT Matrix extender system, not an AV-over-IP system.

Q: Does it support PoC?
A: Yes. It supports 24V PoC on all HDBaseT ports.

Q: Do the HDBaseT Receivers need separate power adapters?
A: Normally no. The Receivers can be powered by the Matrix through CAT cable.

Q: What power does the Matrix use?
A: The Matrix uses AC 100–240V 50/60Hz power.

Q: Does it support 4K to 1080p downscaling?
A: Yes. Each output supports independent 4K to 1080p downscaling.

Q: Why is downscaling useful?
A: It helps when a 4K source is connected but one or more displays only support 1080p.

Q: Does it support audio extraction?
A: Yes. It supports audio de-embedding through coaxial and balanced analog audio outputs.

Q: Does each output have separate audio output?
A: Yes. AUDIO OUT 1–8 follows OUTPUT 1–8.

Q: What audio formats are supported from coaxial output?
A: Coaxial audio supports PCM 2.0, Dolby Digital / Plus, and DTS 2.0 / 5.1.

Q: What audio format is supported from balanced analog audio?
A: Balanced analog audio supports PCM 2.0CH.

Q: Does the Receiver have audio output?
A: Yes. Each Receiver includes AUDIO OUT for analog audio extracted from the HDMI signal.

Q: What HDMI audio formats are supported?
A: HDMI audio supports LPCM up to 7.1, Dolby Digital, Dolby TrueHD, Dolby Digital Plus, DTS-ES, DTS-HD Master, DTS-HD HRA, and DTS:X.

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

Q: What does IR matrix mean?
A: It means IR can follow the selected HDMI video source from the Receiver side back to the matching Matrix IR OUT port.

Q: Does IR from the Matrix side follow video routing?
A: No. Matrix-side IR is one-to-one and does not follow video switching.

Q: Does IR from the Receiver side follow video routing?
A: Yes. Receiver-side IR follows the selected HDMI input route.

Q: Does it support RS-232 control?
A: Yes. It supports RS-232 command control.

Q: Does it support RS-232 pass-through to Receivers?
A: Yes. The Receivers include RS-232 ports, and the command list includes HDBT UART settings.

Q: What is the default RS-232 baud rate?
A: The default baud rate is 115200.

Q: Does it support Web GUI control?
A: Yes. It supports browser-based Web GUI control through the TCP/IP port.

Q: What is the default Web GUI IP address?
A: The manual lists the default IP address as 192.168.1.100.

Q: What are the default Web GUI passwords?
A: The default User password is “user” and the default Admin password is “admin.”

Q: Can I check the IP address from the front panel?
A: Yes. Press MENU three times on the OLED screen interface to check the current IP address.

Q: Does it support EDID management?
A: Yes. It supports EDID through front panel buttons, RS-232, and Web GUI.

Q: How many EDID modes are included?
A: It includes 21 factory EDID settings, 2 user-defined EDID modes, and 16 copy EDID modes.

Q: Can it copy EDID from HDMI outputs?
A: Yes. It can copy EDID from HDMI OUTPUT 1–8.

Q: Can it copy EDID from HDBaseT outputs?
A: Yes. It can copy EDID from HDBT OUTPUT 1–8.

Q: Does it support CEC?
A: Yes. CEC control is supported.

Q: Can I save presets?
A: Yes. Presets can be saved and recalled through the Web GUI or RS-232 commands.

Q: How many presets are supported?
A: The RS-232 command list supports presets 1 through 8.

Q: Can I lock the front panel buttons?
A: Yes. The LOCK button can lock front panel buttons except the power button.

Q: What should I do if there is no video on one output?
A: Check the selected input source, HDMI cable, CAT cable, Receiver power, display input, stream setting, EDID, scaler mode, and whether the source is active.

Q: What should I do if all outputs have no video?
A: Check Matrix power, HDMI source output, HDMI input cable, input selection, EDID setting, and whether the Matrix is in standby.

Q: What should I do if a 1080p display does not show a 4K source?
A: Set that output’s scaler mode to 4K to 1080p or Auto.

Q: What should I do if a Receiver has no signal?
A: Check the CAT cable, Receiver power LED, connection signal indicator, data signal indicator, HDMI cable, and display input.

Q: What should I do if the connection signal indicator is flashing?
A: The Matrix and Receiver are in poor connection status. Check CAT cable quality, terminations, cable length, and direct connection.

Q: What should I do if the data signal indicator is dark?
A: No HDMI signal is detected. Check the selected source, HDMI input cable, EDID, and output stream setting.

Q: What should I do if Web GUI does not open?
A: Confirm the Matrix IP address, connect the TCP/IP port to the same network as the PC, and make sure the PC is on the same network segment.

Q: What should I do if audio output does not work?
A: Confirm the output route, check the audio output port, and set the HDMI source audio to PCM / Stereo for analog audio output.

Q: What should I do if IR control does not work?
A: Check whether the IR Receiver and IR Blaster are connected in the correct direction, confirm the IR route, and place the IR Blaster near the controlled device’s IR sensor.

Q: What should I do if RS-232 does not work?
A: Check RS-232 wiring, baud rate, command format, control system settings, and whether the correct RS-232 or HDBT UART path is being used.

Q: Does the UHD88-EXB400R-K need external power?
A: Yes. Connect the AC power cable to the Matrix. The HDBaseT Receivers can be powered through CAT cable using 24V PoC.