Adder CATx VGA, USB Computer Access Module


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Video Type: VGA
Keyboard / Mouse: USB
Audio: No
Dual Access (video splitter / peripheral hub): No
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The Adder CATX-USB is a USB Computer Access Module (CAM) which connects to the keyboard, video and mouse ports of the computer and converts these signals via UTP CAT cabling to AdderView CATx KVM switch or Adder extender receiver (either AdderLink X2 Silver or X200). Increasingly important is the support of DDC (Display Data Channel) which allows the communication of a computers video card and the screen. Unless this communication is actively supported, as all Adder CAMs do, then the desired resolution may not be displayed, and in some cases without the Adder CAM nothing may display at all.

Where computers only present USB keyboard and mouse it is important to ensure that all USB functions are supported. The Adder CATX-USB includes 'keep alive' circuitry to ensure all functions are active and supported. During periods of inactivity a computer will occasionally send a 'keep alive' signal to it's keyboard and mouse, and unless this is responded to the computer may stop keyboard and mouse communications. Sun computers will also request a 'country code' from the keyboard, and unless this is actively supported some Sun computers may not work.

Adder CATX-USB Features

  • Adder CATX-USB High Definition VGA up to 1000ft away

    Up to 1000ft via Single CATx Cable

    The CATX-USB Computer Access Modules allow you to extend your VGA equipped computer over a single CATX cable; The maximum resolutions achievable are:
    • 1920 x 1200 @ 60Hz - up to 330 feet (100 meters)
    • 1600 x 1200 @ 60Hz - up to 650 feet (200 meters)
    • 1280 x 1024 @ 60Hz - up to 1000 feet (300 meters).
  • Adder CATX-USB USB Powered - No external power supplies needed

    USB Powered - No external power supplies needed

    The CATX-USB CAM uses USB to pull power from the source host computer, eliminating the need for any separate power supply and thus simplifying installation. The USB cable must be connected to a USB port on the computer that is capable of providing up to 500mA.

  • Adder CATX-USB extended profile DDC EDID

    EDID Display Information

    The CATX-USB module will check during power up the EDID information available from the KVM switch or extender that is connected to the monitor and passes this back to the computer. If required, you can also harvest and store new EDID information from your display (Read and Store). This will ensure perfect resolution and availability of each video source during switching.

  • Adder CATX-USB USB 1.1 HID Device Support


    Adder CATX-USB CAM supports USB-HID (1Mb/s) devices such as standard keyboards and mice.

  • Adder CATX-USB Compact 0U palm-sized

    'Zero-U' Palm-sized

    Measuring at only 1 in x 1.75 in x 3 in, and weighing only 100 g, Adder CATX-USB CAM is a compact unit that fits in your palm, and takes 0U at the rack.

  • Adder CATX-USB Flash upgradable

    Flash Upgradable

    Adder CAMs are designed to be a future proof solution - Flash-upgradability via the usb connection Adder CAMs makes updating easy and allows custom EDID adjustment for non-standard operations.

  • Adder CATX-USB - Plug & Play

    Plug and Play

    Adder CATx CAMs are delivered in a zero configuration state so you can plug them in and start working on them straight away. There is no need for drivers or software to be installed.

  • Adder CATX-USB Multi-platform support

    Multi-platform support

    Adder CATx CAMs are designed to be OS-independednt and work with all known software and computer platforms, including Windows, DOS, Linux, Unix, BSD, Sun OS), Mac OS, NetWare, etc.

CATX-USB Package Contents

Adder CATX-USB Package Contents

  1. (1) CATX-USB Computer Access Module
  2. (1) 2-Year Limited Warranty & Lifetime Support

Adder CATX-USB Specifications

1 in. (25 mm.)
1.75 in. (45 mm.)
3 in. (75 mm.)
0.2 lb. (100 g.)
Material ABS molded plastic
Operating Temperature
0°C to 40°C / 32°F to 104°F
Operating Voltage

USB powered device Max 500mA @ 5V

O/S Compatibility

Operating system independent

Approved Agency
(Export Classification Control Number)
(Harmonized Tariff Schedule)
8471.80.10 ('Control or adapter units')

1 x VGA;
1 x USB- Type A plug;
1 x RJ45



Max Resolution & Extension

1920 x 1200 @ 60Hz at 200m (650ft)
1600 x 1200 @ 60Hz at 200m (650ft)
1280 x 1024 @ 60Hz at 300m (1000ft)

Question: What part would I use to connect USB keyboards and mice to the Adder KVM ports?
Answer: You would use the CATX-USB Computer Access Module and a cat5 cable to attach a server/computer to a compatible KVM. The keyboard and mouse would then attach to the actual KVM itself. For a KVM such as the there are different cables such as the

Question: I wish to purchase Adder product: N3493 "CATX-USB". It may be a discontinued model. Can you help me to locate this item? Thank you!
Answer: Thank you for your inquiry.
According to our contact at Adder, part number N3493 does not exist in their catalogs, past or present. It is most likely an internal part number from wherever the dongle/switch was initially purchased. The above CATX-USB Computer Access Module is a standard Adder dongle for CATx switches and some KVM extenders.

Please feel free to forward the source of the part number to us and we can investigate further, or give us a call at 1-877-586-6654 and we can help you find the right dongle for your specific switch.

Question: Is there an audio capable model of this?
Answer: Thank you for your inquiry. The audio enabled version of this Computer Access Module (CAM) is the Adder CATX-USBA, found here: