UHD-EXB350EAU-K Overview and Use Cases

What Is the UHD-EXB350EAU-K?

The OREI UHD-EXB350EAU-K is a professional 4K HDBaseT 3.0 HDMI extender kit with HDMI loop out, USB 2.0 KVM, eARC / ARC, LAN pass-through, audio extraction, IR, RS-232, and Power over Cable.

The kit includes a Transmitter and Receiver. The HDMI source connects to the Transmitter, the HDMI display connects to the Receiver, and a CAT 6A / CAT 7 cable connects the Transmitter and Receiver.

The UHD-EXB350EAU-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, ARC/eARC audio return, HDMI loop out with audio-only mode, SPDIF and L/R audio extraction, USB 2.0 transmission, bi-directional IR, RS-232 pass-through, 1Gbps LAN pass-through, and transmission distance up to 100m over a single CAT 6A / CAT 7 cable.

The UHD-EXB350EAU-K is useful for home theaters, conference rooms, classrooms, control rooms, AV racks, offices, commercial AV installations, gaming/media setups, and installations where HDMI video, USB, LAN, audio, and control signals need to be extended over one CAT cable.

IMPORTANT — UHD-EXB350EAU-K Supports 4K@60Hz 4:4:4

The UHD-EXB350EAU-K supports video resolutions up to 4K@60Hz 4:4:4.

This makes it suitable for HDMI 2.0 installations that need full-quality 4K video extension over long CAT cable distance.

To get 4K@60Hz, the HDMI source, HDMI display, HDMI cables, CAT cable, and source settings must all support 4K@60Hz.

IMPORTANT — Use CAT 6A / CAT 7 Cable

The UHD-EXB350EAU-K extends HDMI, USB, LAN, IR, RS-232, and audio up to 100m over a single CAT 6A / CAT 7 cable.

For best performance, use high-quality shielded CAT 6A or CAT 7 cable.

Poor-quality CAT cable may cause:

1. No video
2. Flickering
3. Black screen
4. Link LED flashing
5. 4K@60Hz not working
6. USB issues
7. LAN issues
8. Audio dropouts
9. ARC/eARC issues
10. IR or RS-232 control issues
11. PoC power issues

IMPORTANT — Use a Direct CAT Cable Connection

The UHD-EXB350EAU-K is an HDBaseT extender and must be connected directly from the Transmitter HDBT OUT port to the Receiver HDBT IN port.

Do not connect the HDBT cable through:

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

IMPORTANT — Power over Cable Is Supported

The UHD-EXB350EAU-K supports PoC, meaning Power over Cable.

Only one 24V/1A power adapter is needed.

The power adapter can be connected to either:

1. Transmitter
2. Receiver 
    
   The other unit receives power through the CAT cable.

IMPORTANT — eARC / ARC Is Supported

The UHD-EXB350EAU-K supports ARC and eARC.

This allows audio from an ARC/eARC-enabled TV connected to the Receiver to return back through the extender to an ARC/eARC soundbar or AVR connected at the Transmitter side.

For eARC / ARC to work:

1. The TV must support ARC or eARC
2. The soundbar or AVR must support ARC or eARC
3. The correct ARC / SPDIF mode must be selected
4. The HDMI ports used must support ARC / eARC

IMPORTANT — SPDIF Has Audio Format Limits

The SPDIF output supports:

1. LPCM 2.0
2. AC3 5.1
3. DTS 5.1 
    
   In eARC mode, the manual notes that SPDIF OUT can only output audio up to 5.1CH. 
    
   SPDIF does not support full HDMI/eARC audio formats such as Dolby TrueHD, DTS-HD Master Audio, or full lossless Atmos. 
    
   If there is no audio from SPDIF, set the TV or source audio output to PCM, Dolby Digital 5.1, or DTS 5.1.

IMPORTANT — L/R Analog Audio Supports PCM 2.0

The L/R analog audio output supports PCM 2.0.

If there is no audio from the 3.5mm L/R output, set the source or TV audio output to PCM, LPCM, or Stereo.

The L/R analog output does not support Dolby Digital, DTS, Dolby TrueHD, DTS-HD Master Audio, or multichannel surround formats as analog audio.

IMPORTANT — HDMI Audio Supports Advanced Formats

HDMI audio supports advanced formats including:

1. LPCM
2. Dolby Digital / Plus / EX
3. Dolby TrueHD
4. DTS
5. DTS-EX
6. DTS-96/24
7. DTS High Res
8. DTS-HD Master Audio
9. DSD 
    
   These formats can pass through HDMI when the connected source, extender, TV, soundbar, or AVR also supports them.

IMPORTANT — HDMI Loop Out Has Two Modes

The Transmitter HDMI OUT port can work in two modes:

Use LOOP OUT when connecting a local display near the source.

Use AUDIO ONLY when connecting an AVR or audio device that needs HDMI audio but not video.

IMPORTANT — USB 2.0 Can Work in Both Directions

The UHD-EXB350EAU-K supports USB 2.0 transmission with configurable Host / Device modes.

It can support:

1. USB forward from Transmitter to Receiver
2. USB reverse from Receiver to Transmitter 
    
   This allows PC control from either side depending on the USB switch settings. 
    
   Important: After changing the USB Host / Device switch, power off and reboot the unit for the mode change to apply.

IMPORTANT — LAN Pass-Through Is Supported

Both the Transmitter and Receiver include LAN ports.

The LAN ports support Ethernet pass-through up to 1000Mbps.

This is useful when a network connection also needs to be extended across the same CAT link.

The LAN port indicators show:

Ports and Panel Layout

Step-by-Step Setup

1. Connect the HDMI source device to HDMI IN on the Transmitter. 
   Examples include a Blu-ray player, DVD player, streaming device, cable box, PC, or HDMI matrix.
2. Connect the Receiver HDMI OUT to the TV, monitor, projector, or display.
3. Connect HDBT OUT on the Transmitter to HDBT IN on the Receiver using CAT 6A / CAT 7 cable.
4. Connect the included 24V/1A power adapter to either the Transmitter or Receiver.
5. Power on the HDMI source device and display.
6. Check the Power, Link, and Video LEDs.
7. If using HDMI loop out, connect a local display or AVR to the Transmitter HDMI OUT.
8. Set the LOOP OUT / AUDIO ONLY switch based on your setup.
9. If using ARC/eARC, connect the ARC/eARC TV to the Receiver and the ARC/eARC soundbar or AVR at the Transmitter side.
10. Press the SELECT button to choose ARC mode or SPDIF mode.
11. If using SPDIF audio, connect SPDIF input/output as required by your setup.
12. If using L/R analog audio, set the L/R IN/OUT switch to embedding or de-embedding mode.
13. If using USB, set the Host / Device switches on both units and reboot the units after changing modes.
14. If using LAN, connect network devices to the LAN ports.
15. If using IR control, connect IR Receiver and IR Blaster cables based on the direction of control needed.
16. If using RS-232, connect the RS-232 Phoenix ports to the control devices.
17. Test video, audio, USB, LAN, IR, RS-232, ARC/eARC, and loop output.

CAT Cable Requirement — Critical

Use high-quality CAT 6A / CAT 7 cable for best performance.

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

1. No video
2. No signal
3. Flickering
4. Black screen
5. Link LED flashing
6. Low Power Mode
7. 4K@60Hz failure
8. USB signal issues
9. LAN issues
10. ARC/eARC issues
11. Audio dropouts
12. IR control issues
13. RS-232 issues
14. PoC power issues 
     
    Do not connect the HDBT cable through a network switch or router.

HDMI Cable Requirement — Critical

Use Premium High Speed HDMI cables.

The manual lists the following HDMI cable length guidance:

Poor HDMI cables may cause:

1. No video
2. Flickering
3. Black screen
4. 4K@60Hz not working
5. HDR or Dolby Vision not working
6. ARC/eARC issues
7. Audio dropouts
8. HDCP handshake issues 
    
   For troubleshooting, test the HDMI source directly with the display.

Understanding the Transmitter

The Transmitter is installed near the HDMI source, local display, AVR, or control equipment.

It has:

1. HDMI IN / eARC/ARC IN
2. HDMI OUT with Loop Out or Audio Only mode
3. HDBT OUT
4. SPDIF OUT
5. L/R IN/OUT
6. USB HOST and USB DEVICE ports
7. LAN port
8. IR IN / OUT
9. RS-232
10. SERVICE firmware update port
11. DC 24V power input 
     
    The Transmitter can be powered directly or receive power through PoC from the Receiver.

Understanding the Receiver

The Receiver is installed near the remote HDMI display or ARC/eARC TV.

It has:

1. HDBT IN
2. HDMI OUT / eARC/ARC OUT
3. SPDIF IN
4. L/R OUT
5. USB HOST and USB DEVICE ports
6. LAN port
7. IR IN / OUT
8. RS-232
9. SERVICE firmware update port
10. DC 24V power input 
     
    The Receiver can be powered directly or receive power through PoC from the Transmitter.

Understanding ARC / eARC Mode

ARC/eARC allows TV audio to return from the Receiver side to the Transmitter side.

Typical ARC/eARC setup:

Use the SELECT button to switch to ARC mode when using ARC/eARC.

In eARC mode, the SPDIF OUT port can output audio only up to 5.1CH.

Understanding SPDIF Mode

SPDIF mode is used when optical audio is part of the installation.

The Receiver has SPDIF IN.

The Transmitter has SPDIF OUT.

Use SPDIF mode when sending optical audio from the Receiver side back to the Transmitter side or when using the SPDIF audio routing shown in the manual diagrams.

Supported SPDIF audio formats:

Understanding HDMI Loop Out and Audio Only Mode

The Transmitter HDMI OUT port can work as LOOP OUT or AUDIO ONLY.

Use LOOP OUT for local display preview.

Use AUDIO ONLY when sending audio to an AVR or audio device that requires HDMI input.

Understanding Audio Embedding and De-Embedding

The Transmitter L/R IN/OUT port can work in two ways.

Audio embedding means external analog audio can be inserted into the signal.

Audio de-embedding means audio from HDMI IN can be output through the L/R port.

The Receiver L/R OUT is used as an audio de-embedding output.

Understanding USB Forward Mode From TX to RX

USB forward mode is used when the computer is on the Transmitter side and USB devices are on the Receiver side.

Setup:

After changing the switches, power off and reboot the Transmitter and Receiver.

Example use:

1. Computer connected to Transmitter USB HOST
2. Keyboard and mouse connected to Receiver USB device ports
3. User controls the computer from the Receiver/display side

Understanding USB Reverse Mode From RX to TX

USB reverse mode is used when the computer is on the Receiver side and USB devices are on the Transmitter side.

Setup:

After changing the switches, power off and reboot the Transmitter and Receiver.

Example use:

1. Computer connected to Receiver USB HOST
2. Keyboard and mouse connected to Transmitter USB device ports
3. User controls the computer from the Transmitter/source side

Understanding LAN Pass-Through

The UHD-EXB350EAU-K includes 1G LAN pass-through.

This allows a network connection to pass between the Transmitter and Receiver sides across the same extender link.

LAN indicator behavior:

This LAN port is for Ethernet pass-through. It does not mean the HDMI signal can be routed through a network switch.

Understanding Bi-Directional IR

Bi-directional IR allows IR remote signals to travel in either direction.

Example 1: Control source from Receiver side

1. Connect IR Receiver to IR IN on the Receiver
2. Connect IR Blaster to IR OUT on the Transmitter
3. Place IR Receiver near the display
4. Place IR Blaster near the source device’s IR sensor 
    
   Example 2: Control display from Transmitter side
5. Connect IR Receiver to IR IN on the Transmitter
6. Connect IR Blaster to IR OUT on the Receiver
7. Place IR Receiver near the source-side remote location
8. Place IR Blaster near the display’s IR sensor 
    
   The IR frequency range is 20kHz to 60kHz.

Understanding IR Receiver Distance

The manual lists IR receiver distance based on remote angle.

Place the IR Receiver where the remote control has clear line of sight.

Understanding RS-232 Pass-Through

The UHD-EXB350EAU-K supports RS-232 serial pass-through.

The manual lists RS-232 speed up to 921600bps.

This is useful for:

1. Control systems
2. Projectors
3. Displays
4. HDMI matrix systems
5. AV processors
6. Other RS-232 controlled equipment 
    
   Use the included 3-pin Phoenix connectors for RS-232 wiring.

Understanding Indicator LEDs

Supported Video and Audio

The UHD-EXB350EAU-K supports video formats including:

Supported audio:

What Source Devices Is the UHD-EXB350EAU-K Compatible With?

The OREI UHD-EXB350EAU-K is compatible with HDMI source devices such as:

1. Blu-ray players
2. DVD players
3. Streaming devices
4. Cable boxes
5. Satellite receivers
6. Set-top boxes
7. Desktop PCs
8. Laptops with HDMI output
9. HDMI matrix systems
10. AV receivers
11. Media players 
     
    For 4K@60Hz, the source device must support 4K@60Hz output.

What Displays Is the UHD-EXB350EAU-K Compatible With?

The UHD-EXB350EAU-K can connect to HDMI displays such as:

1. 4K TVs
2. ARC/eARC TVs
3. 1080p TVs
4. Monitors
5. Projectors
6. Commercial displays
7. Conference room displays
8. Classroom displays
9. Control room displays
10. Home theater displays 
     
    For ARC/eARC, the connected TV must support ARC or eARC.

What Audio Devices Is the UHD-EXB350EAU-K Compatible With?

The UHD-EXB350EAU-K can work with:

1. ARC/eARC soundbars
2. ARC/eARC AV receivers
3. HDMI AV receivers
4. Optical audio amplifiers
5. Optical soundbars
6. Powered speakers
7. Stereo amplifiers
8. Audio processors 
    
   Use HDMI ARC/eARC for ARC/eARC soundbar or AVR setups. 
    
   Use SPDIF for LPCM 2.0, AC3 5.1, or DTS 5.1. 
    
   Use L/R analog output for PCM 2.0 stereo audio.

What USB Devices Is the UHD-EXB350EAU-K Compatible With?

The USB 2.0 ports can work with USB devices such as:

1. Keyboard
2. Mouse
3. USB flash drive
4. USB peripherals 
    
   For best performance, use standard USB keyboard and mouse devices for KVM applications. 
    
   USB mode must be set correctly depending on whether the host computer is connected at the Transmitter side or Receiver side.

Frequently Asked Questions

Q: What is the OREI UHD-EXB350EAU-K used for? 
A: The UHD-EXB350EAU-K is used to extend 4K@60Hz HDMI video, audio, USB 2.0, LAN, IR, RS-232, ARC/eARC, SPDIF, and analog audio over a single CAT 6A / CAT 7 cable.

Q: Does the UHD-EXB350EAU-K support 4K@60Hz? 
A: Yes. It supports video resolutions up to 4K@60Hz 4:4:4.

Q: Does the UHD-EXB350EAU-K support 8K? 
A: No. It supports up to 4K@60Hz.

Q: Does the UHD-EXB350EAU-K 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: Does it support HDR and Dolby Vision? 
A: Yes. It supports HDR, HDR10, HDR10+, Dolby Vision, and HLG.

Q: How far can it extend HDMI? 
A: It supports transmission up to 100m / 328ft over a single CAT 6A / CAT 7 cable.

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

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

Q: Does it support Power over Cable? 
A: Yes. Only one 24V/1A power adapter is needed. It can be connected to either the Transmitter or Receiver.

Q: Why is there only one power adapter in the box? 
A: The extender supports PoC, so one unit powers the other through the CAT cable.

Q: Does it support ARC and eARC? 
A: Yes. It supports ARC/eARC audio return from an ARC/eARC TV to an ARC/eARC soundbar or AVR.

Q: How do I switch between ARC and SPDIF mode? 
A: Press the SELECT button on the front panel. The ARC or SPDIF LED will light depending on the active mode.

Q: Does SPDIF support full eARC audio? 
A: No. In eARC mode, SPDIF OUT can output audio only up to 5.1CH.

Q: What audio formats does SPDIF support? 
A: SPDIF supports LPCM 2.0, AC3 5.1, and DTS 5.1.

Q: What audio formats does L/R analog output support? 
A: L/R analog audio supports PCM 2.0.

Q: Why is there no audio from the L/R output? 
A: Set the source or TV audio output to PCM, LPCM, or Stereo.

Q: Does the Transmitter have HDMI loop out? 
A: Yes. The Transmitter HDMI OUT can be used as LOOP OUT or AUDIO ONLY output.

Q: What is AUDIO ONLY mode? 
A: AUDIO ONLY mode makes the Transmitter HDMI OUT output a 720p black screen image with audio from ARC or SPDIF.

Q: Does it support USB KVM? 
A: Yes. It supports USB 2.0 transmission with configurable Host / Device modes.

Q: Can USB work in both directions? 
A: Yes. USB can work forward from Transmitter to Receiver or reverse from Receiver to Transmitter depending on the USB switch settings.

Q: Do I need to reboot after changing USB mode? 
A: Yes. After changing the Host / Device USB switch, power off and reboot the unit.

Q: Does it support LAN pass-through? 
A: Yes. It includes 1Gbps LAN pass-through.

Q: Does LAN pass-through mean I can send HDMI through my network switch? 
A: No. The LAN port is for network pass-through only. The HDBT connection must still be direct between Transmitter and Receiver.

Q: Does it support IR control? 
A: Yes. It supports bi-directional IR with 20kHz to 60kHz frequency support.

Q: Which IR cable goes into IR IN? 
A: The IR Receiver cable connects to IR IN.

Q: Which IR cable goes into IR OUT? 
A: The IR Blaster cable connects to IR OUT.

Q: Does it support RS-232? 
A: Yes. It supports RS-232 serial pass-through up to 921600bps.

Q: What HDMI cable should I use? 
A: Use Premium High Speed HDMI cables. The manual recommends up to 5m / 16ft for 4K60, 10m / 32ft for 4K30, and 15m / 50ft for 1080p60.

Q: What should I do if there is no video? 
A: Check that the Power and Link LEDs are active, confirm the HDMI source and display connections, use a direct CAT 6A / CAT 7 cable, check the Video LED, and test the source directly with the display.

Q: What should I do if 4K@60Hz does not work? 
A: Use Premium High Speed HDMI cables, keep HDMI cables within the recommended 5m / 16ft length for 4K60, use high-quality CAT 6A / CAT 7 cable, and confirm the source and display support 4K@60Hz.

Q: What should I do if ARC/eARC audio does not work? 
A: Confirm the TV and soundbar/AVR support ARC or eARC, use the correct ARC/eARC HDMI ports, switch to ARC mode using the SELECT button, and set the TV audio output to a supported format.

Q: What should I do if USB does not work? 
A: Confirm the USB Host / Device switches are set correctly, power off and reboot after changing USB mode, check the USB cable connection to the host computer, and test with a basic keyboard or mouse.

Q: Does the UHD-EXB350EAU-K need external power? 
A: Yes. Connect the included 24V/1A power adapter to either the Transmitter or Receiver. The other unit receives power through the CAT cable.