What Is the BK-EXB330UIR-K?
The OREI BK-EXB330UIR-K is an HDMI 2.1 HDBaseT extender designed to transmit high-resolution HDMI video, audio, USB 2.0, and control signals over long distances using a single CAT cable. It supports resolutions up to 8K@60Hz and 4K@144Hz, making it suitable for professional AV installations, high-performance gaming setups, control rooms, conference rooms, and other applications that require high-bandwidth HDMI extension.
The extender consists of a Transmitter (TX) and Receiver (RX). The HDMI source connects to the Transmitter, while the display connects to the Receiver. The two units communicate through HDBaseT over a CAT5e/6/7 cable at distances up to approximately 330ft / 100m (328ft specified).
In addition to HDMI extension, the BK-EXB330UIR-K supports USB 2.0 KVM extension, allowing USB devices such as keyboards, mice, USB cameras, flash drives, and touch panels to be connected at the Receiver while controlling a computer connected to the Transmitter.
It also includes bi-directional IR, RS-232, CEC pass-through, EDID management, audio de-embedding, and bi-directional Power over Cable (PoC) for flexible professional installations.
IMPORTANT — HDMI 2.1 and High-Refresh-Rate Video Support
The BK-EXB330UIR-K supports HDMI 2.1 and HDCP 2.3 with video bandwidth up to 48Gbps FRL and 18Gbps TMDS.
Supported high-resolution formats include:
- Up to 8K@60Hz 4:2:0 12-bit
- Up to 4K@144Hz 4:4:4
- 4K@120Hz
- 4K@100Hz
- Standard 4K@60Hz and lower resolutions
- HDR10
- HDR10+
- Dolby Vision
- HLG
It also supports HDMI 2.1 features including:
- VRR — Variable Refresh Rate
- ALLM — Auto Low Latency Mode
- QMS — Quick Media Switching
- QFT — Quick Frame Transport
- SBTM — Source-Based Tone Mapping
These features make the extender particularly useful for gaming, high-frame-rate video, and other HDMI 2.1 applications.
Ports and Panel Layout
Transmitter
| Port / Control | Function |
| HDMI IN | Connect an HDMI source such as a computer, gaming system, streaming device, Blu-ray player, or other HDMI source. |
| HDBaseT OUT | Connect to the Receiver using a CAT5e/6/7 cable. |
| HOST USB-B | Connect to the USB host device, normally a computer. |
| IR IN | Connect the IR Receiver cable to receive IR commands from the Transmitter side. |
| IR OUT | Connect the IR Blaster cable to control a device located at the Transmitter side. |
| RS-232 | Used for RS-232 command transmission between the Transmitter and Receiver. |
| EDID DIP Switch | Select between TV and STD EDID modes. |
| SERVICE USB-C | Used for firmware updates. |
| DC 24V | Connect the included power adapter when powering the system from the Transmitter side. |
Receiver
| Port / Control | Function |
| HDBaseT IN | Connect to the Transmitter using the CAT cable. |
| HDMI OUT | Connect a TV, projector, monitor, or other HDMI display. |
| AUDIO OUT | 3.5mm audio output for connecting compatible headphones, speakers, soundbars, or other audio equipment. |
| 4 × USB 2.0 DEVICE | Connect USB peripherals such as a keyboard, mouse, USB camera, flash drive, or other USB 2.0 devices. |
| IR IN | Connect the IR Receiver cable. |
| IR OUT | Connect the IR Blaster cable. |
| RS-232 | Used for RS-232 command transmission between the Transmitter and Receiver. |
| SERVICE USB-C | Used for firmware updates. |
| DC 24V | Connect the included power adapter when powering the system from the Receiver side. |
Each USB device port on the Receiver supports up to 5V/500mA power output.
Step-by-Step Setup
- Connect your HDMI source device to the HDMI IN port on the BK-EXB330UIR-K Transmitter.
- Connect the HDBaseT OUT port on the Transmitter to the HDBaseT IN port on the Receiver using a CAT5e/6/7 cable.
- Connect the HDMI OUT port on the Receiver to your TV, projector, monitor, or other HDMI display.
- If USB/KVM functionality is required, connect the included USB-A to USB-B cable between your computer and the HOST USB-B port on the Transmitter.
- Connect your USB devices to any of the four USB 2.0 DEVICE ports on the Receiver.
- If you want to extract audio at the Receiver location, connect the 3.5mm AUDIO OUT port to a compatible audio device.
- Connect the included IR Receiver and IR Blaster cables if IR control is required.
- Connect RS-232 equipment to the RS-232 ports if serial control is required.
- Connect the included 24V power adapter to either the Transmitter or Receiver.
- Power on the HDMI source and display.
The extender supports bi-directional PoC, so only one included power adapter is required. Power can be connected at either the Transmitter or Receiver side to power both units.
HDMI and CAT Cable Requirements — Critical
For reliable HDMI 2.1 performance, especially when using 8K@60Hz or 4K@144Hz, proper cables are very important.
Use Ultra High Speed HDMI cables for HDMI connections when using high-bandwidth HDMI 2.1 resolutions.
The manual specifies HDMI cable transmission of approximately 3m / 9.8ft for 8K@60Hz.
For the HDBaseT connection, the extender supports CAT5e/6/7 cable for distances up to 100m / 328ft.
For maximum stability when using 8K or high-refresh-rate 4K signals, the manual recommends using CAT6A or CAT7 cable.
Common Use Cases
1. Long-Distance 8K HDMI Extension
The BK-EXB330UIR-K can be used when an HDMI source and display are located far apart.
For example:
Media Source / PC → BK-EXB330UIR-K TX → CAT Cable → BK-EXB330UIR-K RX → TV / Projector / Monitor
This allows HDMI signals to travel up to approximately 330ft without requiring a very long HDMI cable.
2. Gaming PC in One Room and Display in Another
The extender supports high-refresh-rate video formats including 4K@120Hz and 4K@144Hz, along with HDMI 2.1 gaming features such as VRR, ALLM, QMS, and QFT.
A gaming PC can remain in an equipment room while the monitor, keyboard, and mouse are located at the gaming station.
Example:
Gaming PC → HDMI + USB → Transmitter → CAT Cable → Receiver → Gaming Display + Keyboard + Mouse
3. Remote PC and KVM Control
The built-in USB 2.0 extension allows a computer located near the Transmitter to be controlled from the Receiver location.
USB devices that can be connected include:
- Keyboard
- Mouse
- USB camera
- USB flash drive
- Touch panel
- Other compatible USB 2.0 peripherals
This can be useful when the computer must remain inside an equipment rack or secure location while users interact with it remotely.
4. Conference Rooms
The BK-EXB330UIR-K can extend both HDMI and USB signals between a conference room table, equipment rack, and display.
For example, a computer can remain at the equipment rack while the remote location has:
- Large display
- USB camera
- Keyboard
- Mouse
- Touch interface
This allows HDMI video and USB control to travel through the same HDBaseT connection.
5. Control Rooms
The extender can be used in control rooms where computers or AV sources are installed inside centralized equipment racks but operators need displays, keyboards, and mice at their workstations.
The combination of HDMI, USB 2.0, RS-232, and IR extension reduces the number of separate cables required between locations.
6. Digital Signage
The BK-EXB330UIR-K can extend HDMI signals from a centrally located media player or computer to a remotely installed digital signage display.
This is useful in installations where the source equipment needs to remain inside an equipment rack while the display is installed far away.
7. Multimedia and Broadcast Applications
The extender can be used in multimedia and broadcasting environments where high-resolution HDMI video must be transmitted over longer distances while maintaining access to USB peripherals and control functions.
8. Remote Audio Extraction
The Receiver includes a 3.5mm AUDIO OUT connection that can de-embed audio from the HDMI signal.
This allows an audio device such as compatible powered speakers, headphones, or another system with a 3.5mm input to receive audio at the Receiver location.
9. IR Remote Control
Bi-directional IR allows devices at either end of the extender to be controlled from the opposite location.
For example, a source device located near the Transmitter can be controlled using its remote from the Receiver/display location.
The IR system supports wideband frequencies from 20kHz to 60kHz.
10. RS-232 Device Control
The RS-232 ports allow serial commands to pass between the Transmitter and Receiver.
This can be useful in professional AV installations where displays, control systems, or other equipment require RS-232 communication.
EDID Settings
The Transmitter includes an EDID DIP switch with two modes.
TV Mode
Copies the EDID information from the display connected to the Receiver.
Use this mode when you want the HDMI source to automatically detect the capabilities of the connected TV, projector, or monitor.
STD Mode
Uses the extender's standard EDID:
4K@60Hz 4:4:4 SDR 2CH
STD mode can be useful when automatic EDID detection causes compatibility or handshake issues.
What Source Devices Is the BK-EXB330UIR-K Compatible With?
The BK-EXB330UIR-K can be used with HDMI source devices that output a supported HDMI resolution and format.
Typical source devices include:
- Desktop computers
- Gaming PCs
- Laptops with HDMI output
- Gaming consoles
- Blu-ray / UHD Blu-ray players
- Streaming media players
- Set-top boxes
- Media players
- Professional AV equipment
The maximum video resolution and refresh rate available will depend on the capabilities of the source device, display, HDMI cables, and complete system.
What Displays Is the BK-EXB330UIR-K Compatible With?
The Receiver can connect to HDMI displays including:
- TVs
- Computer monitors
- Gaming monitors
- Projectors
- Professional displays
- Digital signage displays
For 8K or high-refresh-rate 4K operation, the connected source and display must both support the requested HDMI resolution and refresh rate.
What USB Devices Can Be Connected?
The Receiver provides four USB 2.0 device ports.
Typical compatible devices include:
- Keyboard
- Mouse
- USB camera
- USB flash drive
- Touch panel
- Other compatible USB 2.0 peripherals
The USB HOST connection on the Transmitter must be connected to the computer when using USB extension.
Each Receiver USB port supports up to 5V/500mA.
Frequently Asked Questions
Q: What does the OREI BK-EXB330UIR-K do?
A: The BK-EXB330UIR-K extends HDMI video, audio, USB 2.0, IR, and RS-232 signals between a Transmitter and Receiver using a single CAT cable. It can transmit signals up to approximately 330ft.
Q: Does the BK-EXB330UIR-K support 8K?
A: Yes. It supports video resolutions up to 8K@60Hz 4:2:0 12-bit.
Q: Does it support 4K@120Hz?
A: Yes. The extender supports 4K@120Hz and can support resolutions up to 4K@144Hz 4:4:4.
Q: Does it support HDMI 2.1?
A: Yes. The BK-EXB330UIR-K is HDMI 2.1 compliant and supports bandwidth up to 48Gbps FRL and 18Gbps TMDS.
Q: Does it support VRR?
A: Yes. The extender supports HDMI 2.1 features including VRR, ALLM, QMS, QFT, and SBTM.
Q: How far can the HDMI signal be extended?
A: The HDBaseT connection supports transmission up to 100 meters / 328 feet, approximately 330ft, using a compatible CAT cable.
Q: Can I connect a keyboard and mouse at the Receiver?
A: Yes. The Receiver provides four USB 2.0 ports that can be used with devices such as keyboards and mice. The Transmitter's USB HOST port must also be connected to the computer.
Q: Can I connect a USB camera?
A: Yes. The manual lists USB cameras among the supported USB 2.0 device examples. Available performance will depend on the connected USB device and its USB 2.0 requirements.
Q: Does the extender require power at both the Transmitter and Receiver?
A: No. The BK-EXB330UIR-K supports bi-directional Power over Cable. The included 24V power adapter can be connected to either the Transmitter or Receiver to power both units.
Q: Can I extract audio at the Receiver?
A: Yes. The Receiver has a 3.5mm AUDIO OUT port for audio de-embedding from the HDMI signal.
Q: Does it support Dolby Atmos?
A: Yes. HDMI audio support includes formats such as LPCM, Dolby Digital, Dolby Digital Plus, Dolby TrueHD, Dolby Atmos, DTS, DTS-HD Master Audio, and DTS:X.
Q: Does it support HDR and Dolby Vision?
A: Yes. The BK-EXB330UIR-K supports HDR10, HDR10+, Dolby Vision, and HLG pass-through.
Q: Does it support IR remote control?
A: Yes. It supports bi-directional IR between the Transmitter and Receiver with wideband IR frequencies from 20kHz to 60kHz.
Q: Does it support RS-232?
A: Yes. RS-232 commands can be transmitted between the Transmitter and Receiver using the provided RS-232 connections.
Q: Does it support CEC?
A: Yes. HDMI CEC pass-through is supported.
Q: What should I do if I cannot get 8K or 4K@144Hz video?
A: Make sure the source and display both support the requested resolution. Use certified Ultra High Speed HDMI cables, verify that HDMI 2.1 features are enabled on the source and display, and use CAT6A or CAT7 cable for maximum bandwidth stability.
Q: What should I check if the keyboard or mouse does not work?
A: Disconnect and reconnect the USB device, try another USB port on the Receiver, restart the connected computer, and confirm that the USB HOST connection between the computer and Transmitter is properly connected.
Q: What should I check if IR control is not working?
A: Verify that the IR Receiver and IR Blaster cables are connected to the correct ports, position the IR emitter directly over the source device's IR sensor, and avoid possible interference from fluorescent lighting.
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