User Manual for gofanco 1x8 HDMI CAT Splitter/Extender 4K30 - 70M
Comprehensive user guide for the gofanco 1x8 HDMI CAT Splitter/Extender (HD14Ext-8P). Includes installation steps, wiring diagrams, IR control setup, RS232 commands, and troubleshooting tips for optimal performance.
Quick answers from the manual
Quick answer
- The gofanco 1x8 HDMI CAT Splitter/Extender distributes one HDMI source to eight remote displays via CAT6/7 cables, supporting up to 4K@30Hz resolution and 70m transmission distance. p. 3
Key actions
- Hardware Installation p. 8
First start
- Connect all cables while devices are powered off, then connect power adapters and power on the source and displays. p. 8
Problems and fixes
Change to a higher quality HDMI cable and ensure the cable length is less than or equal to 5 meters.
p. 13Maintenance and reset
- Press the reset button on the Transmitter or Receiver to restart the device. p. 5, 6
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Transmission distance | 70m (1080p), 40m (4K30Hz) | Maximum distance over CAT6/7 cables. | p. 14 |
Where to find it in the PDF
- Hardware Installation p. 8
- Specifications p. 14
Table of contents
Manual images
Click an image to enlargeQuick Guide
The gofanco 1x8 HDMI CAT Splitter/Extender allows you to distribute an HDMI signal from a single source to eight remote displays using CAT6/7 cables. It supports resolutions up to 4K at 30Hz and includes features like bi-directional IR control and RS232 management. Ensure all devices are powered off before making connections.
Product Layout
The system consists of a Transmitter (TX) and eight Receivers (RX). The Transmitter features an HDMI input, an HDMI loopout for local monitoring, eight CAT6/7 outputs, IR ports, and an RS232 port. Each Receiver includes a CAT6/7 input, an HDMI output, IR ports, and a 3.5mm audio output.
Hardware Installation
Follow these steps to set up your system:

- Power off all devices, including the HDMI source and displays.
- Connect your HDMI source device to the Transmitter's HDMI In port using an HDMI cable.
- Connect CAT6/7 cables from the Transmitter's CAT6/7 Out ports to the CAT6/7 In ports on each Receiver.
- Optional: Connect a local HDMI display to the Transmitter's HDMI Out port.
- Connect an HDMI display to each Receiver's HDMI Out port.
- Optional: Connect IR Emitter and Receiver cables to the designated IR ports if remote control is required.
- Connect the included 12V/2A power adapter to the Transmitter and the 5V/500mA power adapters to each Receiver.
- Power on your HDMI source and displays.
CAT Cable Wiring
For optimal performance and compatibility, use the T568B wiring standard for both RJ-45 connectors. It is recommended to use 100% copper 23AWG CAT cable in one straight run to avoid signal degradation.

IR Control
The system supports bi-directional IR control. To control the source device from a remote location, connect an IR Emitter to the Transmitter's IR Out and an IR Receiver to the Receiver's IR In. To control a display from the source location, reverse the connection: connect an IR Receiver to the Transmitter's IR In and an IR Emitter to the Receiver's IR Out.
RS232 Control
The Transmitter can be controlled via a PC using an RS232 cable. The COM port settings are: Baud Rate 9600, Data Bits 8, Stop Bits 1, and Parity Bits None. Various commands are available to turn specific output ports on or off, restart the device, or restore factory settings.
Troubleshooting
If you experience issues, check the following:
- No video signal: Verify HDMI cable connections and ensure the display resolution is compatible with the splitter.
- Snowy or fuzzy screen: Ensure HDMI cables are of high quality and 5 meters or shorter in length.
- CAT signal issues: Check that CAT cables are within the specified length range and wired correctly.
- Reset: Press the reset button on both the Transmitter and Receiver if signal issues persist.
Specifications
The system supports HDMI 1.4 and HDCP 1.4. Transmission distance is up to 70m at 1080p and 40m at 4K30Hz. The Transmitter operates on 12V/2A, while each Receiver operates on 5V/500mA.

Practical help
Common problems
Check HDMI cable connections and ensure the display resolution is compatible with the splitter.
Use higher quality HDMI cables and ensure the cable length is 5 meters or less.
Press the reset button on both the Transmitter and Receiver, then reconnect.
Before use
- Power off all devices before installation
- Ensure CAT6/7 cables are available
- Verify HDMI cables are 5m or shorter
- Check that power adapters match the required specifications (12V/2A for TX, 5V/500mA for RX)
Specs in practice
- Transmission distance
- Up to 70m at 1080p and 40m at 4K30Hz using CAT6/7 cables.
Images and diagrams
- Figure 1: Transmitter layout showing ports and LEDs
- Figure 2: Receiver front panel layout
- Figure 3: Receiver back panel layout
- Figure 4: Application diagram for system setup
Model compatibility
- Requires CAT6/7 cables
- Supports HDCP 1.4
- Supports 4K @30Hz YUV 4:4:4
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.