What Is the HD-EXM330-K?
The OREI HD-EXM330-K is a 1080p HDMI over IP extender with HDMI loop out. It sends one HDMI source to one display directly, or to multiple displays through a standard 1G network switch.
The kit includes an Encoder and Decoder. The HDMI source connects to HDMI IN on the Encoder, the local display can connect to HDMI OUT on the Encoder, the remote display connects to HDMI OUT on the Decoder, and CAT6 cable connects the Encoder and Decoder directly or through a 1G switch.
The HD-EXM330-K supports HDMI 1.4 and HDCP 1.4, with a video bandwidth of 6.75Gbps. It supports video resolutions up to 1920x1200@60Hz, 1G network bandwidth, EZCast compression technology, HDMI loop out on the Encoder, one-way IR control from Decoder to Encoder, PCM 2.0 audio output, and transmission distance up to 150m / 492ft over CAT6 cable.
The HD-EXM330-K is useful for classrooms, conference rooms, home entertainment, retail displays, restaurants, bars, houses of worship, and installations where one HDMI source needs to be extended or distributed over a 1G network.
IMPORTANT — HD-EXM330-K Supports 1080p / 1920x1200, Not 4K
The HD-EXM330-K supports video resolutions up to 1920x1200@60Hz.
It does not support:
- 4K
- 4K@60Hz
- 4K@120Hz
- 8K
For 4K extension, use a 4K HDMI extender or 4K HDMI over IP model.
IMPORTANT — This Product Does Not Support Interlaced Signals
The manual specifically notes that this product does not support interlaced signals.
That means i-standard formats are not supported.
Examples of unsupported interlaced formats may include:
- 1080i
- 720i
- 480i
Use progressive output formats such as 1080p or 1920x1200@60Hz for best compatibility.
IMPORTANT — Extends up to 150m / 492ft Over CAT6
The HD-EXM330-K supports transmission distance up to 150m / 492ft between the Encoder and Decoder using a single CAT6 cable.
| Cable Type | Maximum Distance |
| CAT6 | Up to 150m / 492ft |
Poor-quality CAT cable may cause signal dropouts, no video, unstable connection, or reduced distance.
IMPORTANT — Supports Direct Connection or Switch-Based Distribution
The HD-EXM330-K can be used in two common ways:
| Setup | Support |
| Encoder directly to Decoder | Supported |
| One Encoder to multiple Decoders through 1G switch | Supported |
| Standard 1G / Layer 2 switch | Supported |
| 100M switch | Not recommended |
The manual shows both a direct Encoder-to-Decoder setup and a one-Encoder-to-multiple-Decoders setup through an L2 switch.
IMPORTANT — Use a Standard 1G L2 Switch
The HD-EXM330-K supports 1G standard 2L / Layer 2 switch use.
For one-to-many distribution, use a proper 1G network switch.
Avoid using a 100M switch because the product uses 1G video network bandwidth.
IMPORTANT — HDMI Loop Out Is on the Encoder
The Encoder includes HDMI OUT.
This HDMI OUT port is used for a local display near the HDMI source.
Example setup:
| Location | Device |
| Source side | DVD / Blu-ray player connected to Encoder HDMI IN |
| Source side | Local TV connected to Encoder HDMI OUT |
| Remote side | Decoder connected to remote TV HDMI OUT |
This is useful when the source needs to be viewed locally and also sent to one or more remote displays.
IMPORTANT — One-Way IR Control Is Supported
The HD-EXM330-K supports one-way IR control from Decoder to Encoder.
This allows the user near the remote display to control the HDMI source near the Encoder.
Typical setup:
- Connect the IR Blaster cable to IR OUT on the Encoder
- Place the IR Blaster near the source device IR sensor
- Connect the IR Receiver cable to IR IN on the Decoder
- Place the IR Receiver near the remote display where the source remote can point
The supported IR frequency is wideband 20Hz to 60kHz.
IMPORTANT — EZCast Compression Technology
The HD-EXM330-K uses EZCast compression technology.
The manual describes this as configurable high-quality, low-bandwidth compression video.
Because it is a compressed HDMI over IP extender, it is best suited for general AV distribution, presentations, signage, classrooms, and video viewing.
It is not ideal for zero-latency applications or fast gaming.
IMPORTANT — Direct Interconnection Method Required
The manual notes that the product requires UTP connectors and direct interconnection method wiring.
Do not use cross-connect wiring.
Use standard straight-through CAT6 wiring for reliable performance.
IMPORTANT — Both Encoder and Decoder Need Power
The package includes 5V/1A power supplies.
| Unit | Power Requirement |
| Encoder | DC 5V/1A |
| Decoder | DC 5V/1A |
If either unit does not power on, check the power adapter, outlet, and DC 5V connection.
Ports and Panel Layout
| Port / Indicator | Unit | Function |
| HDMI IN | Encoder | Connect HDMI source device such as DVD, Blu-ray player, or set-top box |
| HDMI OUT | Encoder | HDMI loop output for local TV or monitor |
| CAT OUT | Encoder | Connect to Decoder CAT IN or to a switch / router / hub using CAT6 cable |
| IR OUT | Encoder | Connect IR Blaster cable |
| LINK LED | Encoder | Blue LED flashes when connected to Decoder or switch / router / hub |
| Power LED | Encoder | Blue LED turns on when Encoder is powered |
| DC 5V | Encoder | Connect DC 5V/1A power adapter |
| HDMI OUT | Decoder | Connect HDMI display device |
| CAT IN | Decoder | Connect to Encoder CAT OUT or switch / router / hub using CAT6 cable |
| IR IN | Decoder | Connect IR Receiver cable |
| LINK LED | Decoder | Blue LED flashes when connected to Encoder or switch / router / hub |
| Power LED | Decoder | Blue LED turns on when Decoder is powered |
| DC 5V | Decoder | Connect DC 5V/1A power adapter |
Step-by-Step Setup — Direct Encoder to Decoder
- Connect the HDMI source device to HDMI IN on the Encoder.
Examples include DVD player, Blu-ray player, set-top box, media player, DVR, NVR, laptop, or PC. - Connect a local display to HDMI OUT on the Encoder if needed.
- Connect CAT OUT on the Encoder to CAT IN on the Decoder using CAT6 cable.
- Connect HDMI OUT on the Decoder to the remote TV, monitor, or projector.
- Connect DC 5V/1A power to the Encoder.
- Connect DC 5V/1A power to the Decoder.
- If using IR control, connect the IR Blaster cable to IR OUT on the Encoder.
- Place the IR Blaster near the source device IR sensor.
- Connect the IR Receiver cable to IR IN on the Decoder.
- Place the IR Receiver near the remote display where the source remote can point.
- Power on the HDMI source and display.
- Test video, audio, local loop out, and IR control.
Step-by-Step Setup — One Encoder to Multiple Decoders
- Connect the HDMI source to HDMI IN on the Encoder.
- Connect a local display to HDMI OUT on the Encoder if needed.
- Connect CAT OUT on the Encoder to a 1G L2 network switch using CAT6 cable.
- Connect each Decoder CAT IN to the same 1G switch using CAT6 cable.
- Connect each Decoder HDMI OUT to a display.
- Connect power to the Encoder, Decoders, switch, source, and displays.
- Test video output on each display.
Important: All Decoders show the same HDMI source. This does not create different video outputs for each display.
CAT Cable Requirement — Critical
Use high-quality CAT6 cable.
| Setup | Cable Type | Distance |
| Encoder to Decoder | CAT6 | Up to 150m / 492ft |
| Encoder to switch / switch to Decoder | CAT6 | Use within network design limits |
Poor CAT6 cable may cause:
- No video
- Flickering
- Black screen
- Decoder not linking
- Link LED not flashing
- Signal dropouts
- IR control issues
- Unstable one-to-many distribution
Use direct interconnection / straight-through wiring.
HDMI Cable Requirement — Critical
Use good-quality HDMI cables for:
- Source to Encoder HDMI IN
- Encoder HDMI OUT to local display
- Decoder HDMI OUT to remote display
Poor HDMI cables may cause:
- No picture
- Flickering
- Black screen
- No sound
- HDCP handshake issues
- Wrong resolution
- No local loop output
For troubleshooting, test the HDMI source directly with the display before using the extender.
Power Requirement — Critical
Both units require DC 5V/1A power.
| Unit | Power |
| Encoder | DC 5V/1A |
| Decoder | DC 5V/1A |
If the Power LED is off, check the power adapter and power connection.
Understanding the Encoder
The Encoder is installed near the HDMI source.
It has:
- HDMI IN for the source
- HDMI OUT for local loop display
- CAT OUT for network transmission
- IR OUT for source control
- LINK LED
- Power LED
- DC 5V power input
The Encoder encodes the HDMI signal and sends it through CAT6 cable.
Understanding the Decoder
The Decoder is installed near the remote display.
It has:
- CAT IN from Encoder or network switch
- HDMI OUT to display
- IR IN for remote-control signal
- LINK LED
- Power LED
- DC 5V power input
The Decoder receives the network signal and outputs HDMI to the display.
Understanding HDMI Loop Out
The Encoder HDMI OUT is a loop output.
It allows the same HDMI source to be shown on a local display while also being sent through CAT6 to the Decoder.
The local and remote displays show the same source.
Understanding One-to-Many Distribution
The HD-EXM330-K can distribute one HDMI source to multiple Decoders through a 1G L2 switch.
In this setup:
- One Encoder connects to the switch
- Multiple Decoders connect to the same switch
- Each Decoder connects to a display
- All displays show the same source
This is useful for signage, classrooms, houses of worship, and commercial display systems.
Understanding IR Control
IR control lets the remote display location control the HDMI source.
Typical setup:
| IR Cable | Connection | Placement |
| IR Receiver | Decoder IR IN | Near remote display, visible to remote control |
| IR Blaster | Encoder IR OUT | Near source device IR sensor |
Use the source remote control to control the source device.
Understanding the LINK LED
The LINK LED helps confirm network connection.
| LED | Meaning |
| LINK LED flashes | Encoder / Decoder is connected to Decoder, Encoder, switch, router, or hub |
| Power LED on | Unit is powered |
If the LINK LED does not flash, check the CAT6 cable and network connection.
Supported Video and Audio
The HD-EXM330-K supports video formats including:
| Supported Video |
| Up to 1920x1200@60Hz |
| RGB |
| YCbCr 4:4:4 |
| YCbCr 4:2:2 |
| Input color depth: 8 / 10 / 12-bit |
| Output color depth: 8-bit |
Supported audio:
| Audio | Support |
| Input audio | PCM 2.0CH / 2.1CH / 5.1CH / 7.1CH |
| Output audio | PCM 2.0CH |
| Sample frequency | 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz |
Supported Technical Specifications
| Specification | Support |
| HDMI Version | HDMI 1.4 |
| HDCP Version | HDCP 1.4 |
| Video Bandwidth | 6.75Gbps |
| Video Network Bandwidth | 1G |
| Maximum Resolution | 1920x1200@60Hz |
| Interlaced Signals | Not supported |
| Compression Technology | EZCast |
| Switch Requirement | 1G standard Layer 2 switch |
| Transmission Distance | Up to 150m / 492ft |
| HDMI Loop Out | Supported on Encoder |
| IR Control | One-way, Decoder to Encoder |
| IR Frequency | Wideband 20Hz to 60kHz |
| IR Level | 5Vp-p |
| Encoder Connections | HDMI IN, HDMI OUT, CAT OUT, IR OUT |
| Decoder Connections | CAT IN, HDMI OUT, IR IN |
| Power Supply | DC 5V/1A |
| Power Consumption | Encoder 1.5W, Decoder 1.1W max |
| Housing | Metal enclosure |
| Color | Black |
| Dimensions | 88mm x 61.2mm x 16.5mm |
| Weight | Encoder 158g, Decoder 155g |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Humidity | 20–90% RH, non-condensing |
| ESD Protection | ±8kV air-gap, ±4kV contact |
What Source Devices Is the HD-EXM330-K Compatible With?
The HD-EXM330-K is compatible with HDMI source devices such as:
- DVD players
- Blu-ray players
- Set-top boxes
- Cable boxes
- Satellite receivers
- Streaming devices
- Media players
- DVRs
- NVRs
- Laptops with HDMI output
- Desktop PCs with HDMI output
The source must output a supported progressive HDMI resolution up to 1920x1200@60Hz.
What Displays Is the HD-EXM330-K Compatible With?
The HD-EXM330-K can connect to HDMI displays such as:
- 1080p TVs
- Monitors
- Projectors
- Commercial displays
- Classroom displays
- Conference room displays
- Digital signage displays
- Local display near the Encoder
The display must support the selected HDMI resolution.
Frequently Asked Questions
Q: What is the OREI HD-EXM330-K used for?
A: The HD-EXM330-K is used to extend one HDMI source to one or multiple HDMI displays over CAT6 cable using HDMI over IP technology.
Q: Does the HD-EXM330-K support 4K?
A: No. It supports up to 1920x1200@60Hz.
Q: Does the HD-EXM330-K support 1080p?
A: Yes. It supports 1080p and up to 1920x1200@60Hz.
Q: Does it support 1080i?
A: No. The manual notes that interlaced signals are not supported.
Q: What HDMI version does it support?
A: It supports HDMI 1.4.
Q: What HDCP version does it support?
A: It supports HDCP 1.4.
Q: What video bandwidth does it support?
A: It supports 6.75Gbps video bandwidth.
Q: What compression technology does it use?
A: It uses EZCast compression technology.
Q: Is this zero latency?
A: No. It uses compression and is not listed as zero latency.
Q: How far can it extend HDMI?
A: It can extend up to 150m / 492ft between Encoder and Decoder over CAT6 cable.
Q: What CAT cable should I use?
A: Use CAT6 cable with direct interconnection / straight-through wiring.
Q: Can I use it through a network switch?
A: Yes. It supports one Encoder to multiple Decoders through a standard 1G Layer 2 switch.
Q: Can I use a 100M switch?
A: No. Use a 1G switch because the video network bandwidth is 1G.
Q: Does the Encoder have HDMI loop out?
A: Yes. The Encoder has HDMI OUT for a local display.
Q: What is HDMI loop out used for?
A: It lets you connect a local display near the source while also sending the same HDMI signal to the Decoder.
Q: Does it support one-to-many distribution?
A: Yes. One Encoder can send the same source to multiple Decoders through a 1G switch.
Q: Does one-to-many create different video outputs?
A: No. All Decoders receive the same HDMI source.
Q: Does it support IR control?
A: Yes. It supports one-way IR control from Decoder to Encoder.
Q: Which IR cable connects to the Encoder?
A: The IR Blaster cable connects to Encoder IR OUT.
Q: Which IR cable connects to the Decoder?
A: The IR Receiver cable connects to Decoder IR IN.
Q: What IR frequency is supported?
A: The manual lists wideband 20Hz to 60kHz.
Q: What audio format is supported?
A: Input supports PCM 2.0 / 2.1 / 5.1 / 7.1, and output supports PCM 2.0.
Q: Does it support Dolby or DTS?
A: The manual lists PCM audio support only. For best compatibility, set the source to PCM / Stereo.
Q: Does it need power on both ends?
A: Yes. The Encoder and Decoder each require DC 5V/1A power.
Q: What does the Power LED mean?
A: The blue Power LED turns on when the unit is powered.
Q: What does the LINK LED mean?
A: The blue LINK LED flashes when the unit is connected to the other unit or to a switch / router / hub.
Q: What should I do if there is no video?
A: Check both power adapters, HDMI cables, CAT6 cable, source resolution, and whether the LINK LED is flashing.
Q: What should I do if the Decoder does not connect?
A: Check the CAT6 cable, confirm straight-through wiring, reduce the cable distance, and use a 1G switch if using one-to-many mode.
Q: What should I do if video is unstable?
A: Use better CAT6 cable, avoid damaged connectors, use a 1G switch, and make sure the source is outputting a supported progressive resolution.
Q: What should I do if audio does not work?
A: Set the source audio output to PCM / Stereo and confirm the display supports HDMI audio.
Q: What should I do if IR control does not work?
A: Confirm the IR Receiver is connected to Decoder IR IN, the IR Blaster is connected to Encoder IR OUT, and the IR Blaster is placed near the source device IR sensor.
Q: Does the HD-EXM330-K need external power?
A: Yes. Connect DC 5V/1A power to both the Encoder and Decoder.
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