Gefen HDMI, USB, RS-232, IR & Audio KVM Over IP Extender / Switch (Transmitter)



Replaced by: Gefen EXT-UHDKA-LANS-TX
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Unit: Transmitter (EXT-HDKVM-LANTX)
Series: HDMI

The Gefen EXT-HDKVM-LANTX is a transmitter for the EXT-HDKVM-LAN HD KVM over IP extender. Extends HDMI, USB, 2-way analog audio, RS-232, and IR, over a Gigabit Local Area Network. HDCP 2.0 compliant resolutions up to 1080p Full HD and 1920 x 1200 (WUXGA) are supported. The Transmitter and Receiver units can be automatically or manually configured to unique IP addresses to allow the connection of multiple Transmitters and Receivers to the same network. Multiple Receiver units can simultaneously connect to any Transmitter unit within the network to create a virtual crosspoint matrix of up to 16 Transmitters and multiple Receivers up to a theoretical limit of just over 65,000 units, depending on the network bandwidth and number of ports of the network switch. Each Receiver unit has a built in Ethernet switch and two additional RJ-45 Ethernet ports to allow for the connection of computers and other IP-enabled devices. USB 2.0 data rates up to 480 Mbps are supported in addition to backward-compatibility with USB 1.1. Each Receiver unit allows the connection of two USB devices with up to 500mA current draw per port, providing access to keyboard, mouse, printers, and scanners, cameras. Bi-directional analog audio capability allows audio to be transported between the Transmitter and the Receiver units. Built-in mic pre-amp on the Receiver unit ensures compatibility with a variety of microphones. IR commands from the Receiver side can be extended to sources located by any of the Transmitters. RS-232 serial control can also be extended between each Transmitter and the Receivers. Built in web server interface makes set up and configuration simple and intuitive. The EXT-HDKVM-LAN HD KVM over IP is perfect for large scale remote workstation access, and for digital signage applications.


Gefen EXT-HDKVM-LAN Diagram

How It Works:

If you are connecting multiple Transmitter units, use the 16-position selector to assign a unique numerical ID to each one. Use the included HDMI cable to connect a computer or other HDMI source to the Transmitter's HDMI input. Use the included USB and RS-232 cables to connect your computer's USB and RS-232 interfaces to the Transmitter unit. Connect audio Line In and audio Line Out as needed to the Transmitter. Connect a Gefen EXT-IR-EMIT IR emitter to the Transmitter and attach it to the IR sensor lens of the source. Connect the HDMI output of the Receiver to your HDTV display. Connect your USB devices, RS-232 devices, microphone, and headphones or amplified speakers to the Receiver unit. If the Receiver is not installed in the line-of-sight of the end-user, and IR commands will need to be sent to the source, connect an EXT-RMT-EXTIRC or EXT-RMT-EXTIRN extender module to the Receiver. Connect the Transmitter and Receiver units to each other directly or through a Gigabit Ethernet switch, using CAT-5e or better cables. Each cable run can be up to 330 feet (100 meters) in length. If the Transmitter is connected to your LAN, you can use the two additional RJ-45 ports on the Receiver to connect computers and other IP enabled devices. Connect the included 5V power supplies to the Transmitter and Receiver units and to available electrical outlets. Power on all associated equipment. Use the Mode button on the Transmitter to optimize the picture for sharper still images or smoother video motion. Press the Switch button on the Receiver to toggle between the different Transmitters connected to the network.

Note: A Gigabit switch is required. The Gigabit switch must support 8k jumbo frame packets. If your LAN is not dedicated to only EXT-DVIKVM-LAN products, then a managed switch is highly recommended.



  • Extends HDMI, USB, RS-232, bi-directional stereo analog audio, and IR over IP, using a Gigabit Local Area Network
  • Supports resolutions up to 1080p Full HD and 1920 x 1200 (WUXGA)
  • Supported HDMI Features:
    • HDCP
    • Deep Color
    • LPCM 7.1 audio, Dolby TrueHD, and DTS-HD Master Audio
    • Lip-Sync pass-through
  • Built-in web interface facilitates intuitive set up and operation
  • Any of the Transmitters within a network can be accessed by any Receiver unit via a web browser on a mobile device or computer, or by using the Gefen Keyboard Switching Controller software (available for download at (
  • Supports a total of just over 65,000 Transmitter and Receiver units, depending on the network bandwidth and number of ports on your network switch
  • USB 2.0 data rates up to 480 Mbps and backward-compatibility with USB 1.1
  • Three-port Gigabit Ethernet switch built into the Receiver unit
  • Mode button on Transmitter for sharpness or motion optimization of image
  • Field-upgradable firmware via web server interface
  • Locking power supply connectors
  • 1U tall, half-rack width enclosures are rack-mountable using EXT-RACK-1U
  • Surface mounting brackets included

EXT-HDKVM-LANTX Package Contents

Gefen EXT-HDKVM-LANTX Back Package Contents

  • (1) EXT-HDKVM-LANTX Sender unit
  • (1) EXT-PS526-AIP-LP-6 5V 2.6A Power Supply
  • (1) 6ft DB9 cable M-F
  • (1) 6ft USB Cable A to B Cable
  • (1) 6ft HDMI Cable with Ethernet and Mono-LOK M-M
  • (2) L-Shaped Mounting Brackets with screws
  • (1) Quick-Start Guide
  • (1) 2-Year Standard Warranty

Gefen EXT-HDKVM-LANTX Specifications:

Width 8.4 in. (213 mm.)
Height1.7 in. (43 mm.)
Depth4.5 in. (113 mm.)
Weight2 lbs. (0.9 kg.)
Operating Temperature32-104 F (0-40 C)
Video Input1 x HDMI Type A 19-pin, female, locking
Video Output1 x HDMI Type A 19-pin, female, locking
Audio (Transmitter/Receiver)1 x 3.5mm mini-stereo (Line In);
1 x 3.5mm mini-stereo (Mic Out)
USB (Transmitter)1 x Type B, female
USB (Receiver)2 x Type A, female
Ethernet (Transmitter)1 x RJ-45
Ethernet (Receiver)3 x RJ-45, shielded
IR Emitter (Transmitter)1 x 3.5mm mini-mono jack
IR Emitter (Receiver)1 x 3.5mm mini-stereo jack
RS-232 (Transmitter)1 x DB-9, female
RS-232 (Receiver)1 x DB-9, male
Maximum Pixel Clock225 MHz
Link Indicator1 x LED, green
Power Indicator1 x LED, blue
Power Input1 x 5V DC, locking
Power Consumption10 W (max.)
Supported Formats 
Resolutions1080p Full HD; 1920 x 1200 (WUXGA)
Reset button (Transmitter)1 x Push button, tact-type
Mode button (Transmitter)1 x Push button, tact-type
Selector switch (Transmitter)1 x 16-position, rotary-type
Switch button (Receiver)1 x Push button, tact-type