What Is the HD-EX330-KVM?
The OREI HD-EX330-KVM is a 1080p HDMI extender with KVM support that extends HDMI video and audio up to 328ft / 100m over CAT6 / CAT6A cable. It allows a remote display, keyboard, and mouse to be connected at the Receiver side while the HDMI source and computer are located at the Transmitter side.
The kit includes one Transmitter, one Receiver, one 12V/1A multinational power supply, and a user manual. The HDMI source connects to HDMI IN on the Transmitter, the local display connects to HDMI OUT loop out on the Transmitter, and the remote display connects to HDMI OUT on the Receiver. A CAT6 / CAT6A cable connects the Transmitter and Receiver. The PC USB host port on the Transmitter connects to the computer, while the keyboard and mouse connect to the USB-A ports on the Receiver.
The HD-EX330-KVM supports HDMI 1.3 and HDCP 1.4, with a video bandwidth of 4.95Gbps. It supports video resolutions up to 1080p@60Hz and 1920x1200@60Hz, LPCM 2.0CH audio, KVM transmission, HDMI loop out on the Transmitter, zero-delay transmission, EDID copy pass-through, and bi-directional PoC.
The HD-EX330-KVM is useful for computer control rooms, offices, classrooms, video conference rooms, multimedia teaching, large-screen demonstrations, workstations, security rooms, server rooms, and installations where a computer needs to be controlled from a remote display location.
IMPORTANT — HD-EX330-KVM Is a 1080p HDMI Extender With KVM
The HD-EX330-KVM extends one HDMI source to one remote HDMI display while also extending keyboard and mouse control.
| Function | Support |
| 1 HDMI input | Supported |
| 1 remote HDMI output | Supported |
| HDMI loop out at Transmitter | Supported |
| USB keyboard and mouse control | Supported |
| Point-to-point HDMI extension | Supported |
| One source to one display | Supported |
| Multiple remote displays | Not supported by itself |
| Matrix switching | Not supported |
This product is designed for point-to-point HDMI extension with KVM control. It is not a splitter or matrix.
IMPORTANT — Supports up to 1080p@60Hz
The HD-EX330-KVM supports video resolutions up to 1080p@60Hz and 1920x1200@60Hz.
| Feature | Support |
| 1080p@60Hz | Supported |
| 1920x1200@60Hz | Supported |
| HDMI 1.3 | Supported |
| HDCP 1.4 | Supported |
| Video bandwidth | 4.95Gbps |
| Color depth | 8-bit |
| Color space | RGB 4:4:4, YCbCr 4:4:4, YCbCr 4:2:2 |
This model does not support 4K, 4K@60Hz, 4K@120Hz, or 8K.
IMPORTANT — Extends up to 328ft / 100m Over CAT6 / CAT6A
The HD-EX330-KVM extends HDMI up to 328ft / 100m over CAT6 / CAT6A cable.
| Cable Type | Maximum Distance |
| CAT6 / CAT6A | Up to 328ft / 100m |
For best performance, use high-quality CAT6 / CAT6A cable.
Poor CAT cable, weak terminations, damaged connectors, couplers, wall plates, patch panels, or low-quality cable may cause no video, flickering, signal loss, USB control issues, or unstable performance.
IMPORTANT — Use Direct CAT Cable Connection
Connect the Transmitter CAT OUT port directly to the Receiver CAT IN port using CAT6 / CAT6A cable.
Do not connect the CAT cable through:
- Network switch
- Router
- Internet network
- LAN switch
- Standard Ethernet network
This is a direct HDMI extender over CAT cable. It is not an AV-over-IP system.
IMPORTANT — KVM Keyboard and Mouse Control Is Supported
The HD-EX330-KVM supports KVM transmission.
| KVM Port | Unit | Function |
| PC USB Host port | Transmitter | Connect to the computer using USB |
| Keyboard USB-A port | Receiver | Connect USB keyboard |
| Mouse USB-A port | Receiver | Connect USB mouse |
This allows the computer at the Transmitter side to be controlled from the Receiver side using a keyboard and mouse.
If a high-power keyboard such as a backlit keyboard is connected, the manual recommends powering the Receiver.
IMPORTANT — HDMI Loop Out Is Supported
The Transmitter includes HDMI OUT loop output.
| Unit | HDMI Port | Function |
| Transmitter | HDMI IN | Connect HDMI source device |
| Transmitter | HDMI OUT | Connect local display |
| Receiver | HDMI OUT | Connect remote display |
The HDMI loop out is useful when a local monitor is needed near the computer or HDMI source while also extending the signal to the remote display.
IMPORTANT — Bi-Directional PoC Is Supported
The HD-EX330-KVM supports bi-directional PoC.
| Power Setup | Support |
| Power from Transmitter to Receiver | Supported |
| Power from Receiver to Transmitter | Supported |
| Included power adapter | DC 12V/1A |
| Separate power on both units normally required | No |
The power adapter can be connected to either the Transmitter or Receiver to power the system through CAT cable.
For high-power USB devices, such as a backlit keyboard, power the Receiver side as recommended in the manual.
IMPORTANT — EDID Copy Pass-Through Is Supported
The HD-EX330-KVM supports EDID copy pass-through on the source and sink end.
EDID helps the HDMI source output a compatible video and audio format for the connected display.
Use EDID copy pass-through when:
- The display does not show video
- The source outputs an unsupported resolution
- The local and remote displays behave differently
- The HDMI source does not detect the display correctly
- The image is unstable or the wrong resolution appears
IMPORTANT — Audio Pass-Through Is Supported
The HD-EX330-KVM supports HDMI audio pass-through.
| Audio Format | Support |
| LPCM 2.0CH | Supported |
The connected HDMI source, display, computer, or audio system must also support the selected audio format.
Ports and Panel Layout
| Port / Button / Indicator | Unit | Function |
| CAT OUT | Transmitter | Connect to CAT IN on Receiver using CAT cable |
| Left LED Green | Transmitter | HDMI signal indicator; on when HDMI input signal is detected |
| Right LED Yellow | Transmitter | Connection signal indicator |
| PC USB Host Port | Transmitter | Connect to a PC |
| DC 12V | Transmitter | DC 12V/1A power input, supports PoC |
| HDMI IN | Transmitter | Connect HDMI source device such as DVD player or computer |
| HDMI OUT | Transmitter | HDMI loop output for local display |
| CAT IN | Receiver | Connect to CAT OUT on Transmitter using CAT cable |
| Left LED Green | Receiver | HDMI signal indicator; on when HDMI input signal is detected |
| Right LED Yellow | Receiver | Connection signal indicator |
| Keyboard USB-A | Receiver | Connect USB keyboard |
| Mouse USB-A | Receiver | Connect USB mouse |
| DC 12V | Receiver | DC 12V/1A power input, supports PoC |
| HDMI OUT | Receiver | Connect remote HDMI display |
Step-by-Step Setup
- Connect the HDMI source device or computer HDMI output to HDMI IN on the Transmitter.
- Connect a local display to HDMI OUT on the Transmitter if a source-side monitor is needed.
- Connect the PC USB Host port on the Transmitter to the computer using a USB cable.
- Connect CAT6 / CAT6A cable from CAT OUT on the Transmitter to CAT IN on the Receiver.
- Connect HDMI OUT on the Receiver to a TV, monitor, projector, or display.
- Connect a USB keyboard to the keyboard USB-A port on the Receiver.
- Connect a USB mouse to the mouse USB-A port on the Receiver.
- Connect the included DC 12V/1A power adapter to either the Transmitter or Receiver.
- If using a high-power keyboard such as a backlit keyboard, connect power at the Receiver side.
- Power on the HDMI source, display, Transmitter, Receiver, and computer.
- Check the green HDMI signal LEDs and yellow connection LEDs.
- Test video, audio, keyboard control, mouse control, and HDMI loop out.
CAT Cable Requirement — Critical
Use high-quality CAT6 / CAT6A cable.
| Requirement | Specification |
| Cable type | CAT6 / CAT6A |
| Maximum distance | Up to 328ft / 100m |
| Connection | Direct Transmitter-to-Receiver connection |
Poor CAT cable may cause:
- No video
- Flickering
- Black screen
- Signal dropouts
- USB keyboard not working
- USB mouse not working
- HDMI signal LED issues
- Connection LED issues
- PoC power issues
Use a direct, properly terminated CAT cable whenever possible.
HDMI Cable Requirement — Critical
Use high-quality HDMI cables.
Poor HDMI cables may cause:
- No picture
- Flickering
- Black screen
- HDMI source not detected
- Local HDMI loop out not working
- Receiver HDMI OUT not working
- HDCP handshake issues
- Audio dropouts
For troubleshooting, test the HDMI source directly with the display before using the extender.
USB Cable and KVM Requirement — Critical
For keyboard and mouse control, the USB connection must be made correctly.
| Connection | Requirement |
| Transmitter PC USB Host port | Connect to computer |
| Receiver USB-A ports | Connect keyboard and mouse |
| CAT cable | Must connect TX and RX directly |
| Computer | Must recognize USB keyboard and mouse |
If keyboard or mouse control does not work, check the USB cable between the computer and Transmitter, reconnect the USB devices, test a basic wired keyboard and mouse, and confirm the CAT cable link is stable.
Power Requirement — Critical
The HD-EX330-KVM uses one DC 12V/1A power adapter and supports bi-directional PoC.
| Unit | Power |
| Transmitter | DC 12V/1A input, supports PoC |
| Receiver | DC 12V/1A input, supports PoC |
| Power Detail | Value |
| Included power adapter | DC 12V/1A |
| PoC from TX to RX | Supported |
| PoC from RX to TX | Supported |
| Power consumption TX to RX | 9.84W |
| Power consumption RX to TX | 5.88W |
If keyboard or mouse devices require more power, connect the power adapter at the Receiver side.
Understanding the Transmitter
The Transmitter is installed near the HDMI source or computer.
It has:
- CAT OUT
- Green HDMI signal LED
- Yellow connection signal LED
- PC USB Host port
- DC 12V power input
- HDMI IN
- HDMI OUT loop output
The Transmitter receives HDMI from the source, sends the signal over CAT6 / CAT6A to the Receiver, provides HDMI loop out for a local display, and connects USB control from the computer to the Receiver-side keyboard and mouse.
Understanding the Receiver
The Receiver is installed near the remote display, keyboard, and mouse.
It has:
- CAT IN
- Green HDMI signal LED
- Yellow connection signal LED
- Two USB-A ports for keyboard and mouse
- DC 12V power input
- HDMI OUT
The Receiver outputs HDMI to the remote display and allows the connected keyboard and mouse to control the computer at the Transmitter side.
Understanding the Application Example
The application diagram shows a PC connected to the Transmitter using HDMI and USB. A local monitor is connected to the Transmitter HDMI OUT loop output. The Transmitter connects to the Receiver using CAT6 / CAT6A cable. At the Receiver side, a TV is connected using HDMI OUT, and a keyboard and mouse are connected to the Receiver USB-A ports.
This shows the main use case: extending a computer’s HDMI video to a remote display while controlling the computer remotely using USB keyboard and mouse.
Understanding LED Indicators
| LED | Unit | Status | Meaning |
| Left LED Green | Transmitter | On | HDMI input signal is detected |
| Left LED Green | Receiver | On | HDMI signal is detected |
| Right LED Yellow | Transmitter / Receiver | Flashing quickly | TX and RX are connected and signal is being transmitted |
| Right LED Yellow | Transmitter / Receiver | Flashing slowly | TX and RX are connected but no signal is being transmitted |
Use these LEDs first when troubleshooting video, connection, or CAT cable issues.
Supported Video and Audio
The HD-EX330-KVM supports video formats including:
| Supported Video |
| 1080p@60Hz |
| 1920x1200@60Hz |
| RGB 4:4:4 |
| YCbCr 4:4:4 |
| YCbCr 4:2:2 |
| 8-bit color |
Supported audio formats include:
| Supported Audio |
| LPCM 2.0CH |
Supported Technical Specifications
| Specification | Support |
| Product Type | 1080p HDMI extender with KVM over CAT6 / CAT6A |
| HDMI Version | HDMI 1.3 |
| HDCP Version | HDCP 1.4 |
| Video Bandwidth | 4.95Gbps |
| Maximum Resolution | 1080p@60Hz, 1920x1200@60Hz |
| Color Space | RGB 4:4:4, YCbCr 4:4:4, YCbCr 4:2:2 |
| Color Depth | 8-bit |
| Audio Format | LPCM 2.0 |
| Transmission Distance | Up to 328ft / 100m for 1080p@60Hz over CAT6 / CAT6A |
| KVM | Keyboard and mouse extension supported |
| HDMI Loop Out | Supported on Transmitter |
| EDID Copy Pass-Through | Supported |
| Zero-Delay Transmission | Supported |
| PoC | Bi-directional PoC supported |
| Transmitter Input | HDMI IN, PC USB Host |
| Transmitter Output | HDMI OUT loop out, CAT OUT |
| Receiver Input | CAT IN |
| Receiver Output | HDMI OUT, USB-A keyboard, USB-A mouse |
| Power Supply | DC 12V/1A |
| Power Consumption | PoC TX to RX: 9.84W; PoC RX to TX: 5.88W |
| Housing | Metal enclosure |
| Color | Black |
| Dimensions | 90mm x 68mm x 22mm |
| Transmitter Weight | 167g |
| Receiver Weight | 165g |
| Operating Temperature | 0°C to 40°C / 32°F to 104°F |
| Storage Temperature | -20°C to 60°C / -4°F to 140°F |
| Operating Humidity | 20%–80% RH, non-condensing |
| Storage Humidity | 10%–90% RH, non-condensing |
| ESD Protection | ±8kV air-gap discharge, ±4kV contact discharge |
What Source Devices Is the HD-EX330-KVM Compatible With?
The HD-EX330-KVM is compatible with HDMI source devices such as:
- Desktop PCs
- Laptops with HDMI output
- DVRs
- NVRs
- Media players
- DVD players
- Blu-ray players
- Cable boxes
- HDMI switch outputs
- HDMI matrix outputs
For KVM control, the source computer must also connect to the Transmitter using the PC USB Host port.
What Displays Is the HD-EX330-KVM Compatible With?
The HD-EX330-KVM can connect to HDMI displays such as:
- 1080p TVs
- Monitors
- Projectors
- Commercial displays
- Classroom displays
- Conference room displays
- Security monitoring displays
- Control room displays
- Remote workstation displays
The display must support the selected HDMI resolution up to 1080p@60Hz or 1920x1200@60Hz.
What USB Devices Is the HD-EX330-KVM Compatible With?
The Receiver USB-A ports are designed for keyboard and mouse use.
Compatible USB devices include:
- Wired USB keyboard
- Wired USB mouse
- Basic USB keyboard and mouse sets
High-power keyboards, such as backlit keyboards, may require the power adapter to be connected at the Receiver side.
Frequently Asked Questions
Q: What is the OREI HD-EX330-KVM used for?
A: It is used to extend 1080p HDMI video and audio up to 328ft / 100m over CAT6 / CAT6A cable while also extending USB keyboard and mouse control.
Q: Does the HD-EX330-KVM support KVM?
A: Yes. It supports keyboard and mouse control from the Receiver side.
Q: Does it support 4K?
A: No. It supports up to 1080p@60Hz and 1920x1200@60Hz.
Q: Does it support 8K?
A: No. It does not support 8K.
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 1.3.
Q: What HDCP version does it support?
A: It supports HDCP 1.4.
Q: What video bandwidth does it support?
A: It supports 4.95Gbps video bandwidth.
Q: What is the maximum resolution?
A: It supports up to 1080p@60Hz and 1920x1200@60Hz.
Q: How far can it extend HDMI?
A: It extends HDMI up to 328ft / 100m over CAT6 / CAT6A cable.
Q: What CAT cable should I use?
A: Use CAT6 or CAT6A cable.
Q: Can I connect it through a network switch?
A: No. It requires a direct CAT cable connection between the Transmitter and Receiver.
Q: Is this AV over IP?
A: No. It is a direct HDMI extender over CAT cable.
Q: Does the Transmitter have HDMI loop out?
A: Yes. The Transmitter has HDMI OUT loop output for connecting a local display.
Q: What is HDMI loop out used for?
A: HDMI loop out allows a local display to be connected near the source while the same signal is also extended to the remote display.
Q: Does it support Power over Cable?
A: Yes. It supports bi-directional PoC.
Q: Can I power the system from the Transmitter side?
A: Yes. The unit supports PoC from Transmitter to Receiver.
Q: Can I power the system from the Receiver side?
A: Yes. The unit supports PoC from Receiver to Transmitter.
Q: What power adapter does it use?
A: It uses a DC 12V/1A power adapter.
Q: Do both units need power adapters?
A: Normally no. One power adapter can power the system through PoC.
Q: When should I power the Receiver?
A: If a high-power keyboard such as a backlit keyboard is connected, the manual recommends powering the Receiver.
Q: Does it support EDID copy pass-through?
A: Yes. It supports EDID copy pass-through on the source and sink end.
Q: Does it support audio pass-through?
A: Yes. It supports LPCM 2.0CH audio.
Q: Does it support Dolby Atmos?
A: Dolby Atmos is not listed in the manual.
Q: Does it support IR control?
A: IR control is not listed for this model.
Q: Does it support RS-232?
A: RS-232 is not listed for this model.
Q: Does it support audio extraction?
A: Audio extraction is not listed for this model.
Q: What does the green LED mean?
A: The green LED is the HDMI signal indicator. It turns on when HDMI input signal is detected.
Q: What does the yellow LED mean?
A: The yellow LED is the connection signal indicator. It flashes quickly when TX and RX are connected and signal is being transmitted. It flashes slowly when TX and RX are connected but no signal is being transmitted.
Q: What should I do if there is no video output?
A: Check the HDMI source, HDMI cables, CAT cable, power connection, and LED indicators. Also confirm the source is outputting a supported resolution such as 1080p@60Hz.
Q: What should I do if keyboard or mouse control does not work?
A: Check the USB connection from the computer to the Transmitter, confirm the keyboard and mouse are connected to the Receiver USB-A ports, test a basic wired keyboard and mouse, and verify the CAT link is working.
Q: Can I use a backlit keyboard?
A: Yes, but if it requires more power, connect the power adapter at the Receiver side.
Q: Does the HD-EX330-KVM need external power?
A: Yes. Use the included DC 12V/1A power adapter. Because the unit supports bi-directional PoC, the adapter can be connected to either the Transmitter or Receiver.
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