StarTech.com ST122PROA Manual

400 MHz VGA Video and Audio Splitter
ST122PROA
ST124PROA
ST128PROA Instruction Guide
The Professionals’ Source For Hard-to-Find Computer Parts
VIDEO SSPLITTER
* Actual product may vary from photo
* ST128PROA shown

FCC COMPLIANCE STATEMENT
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

1
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2
Introduction
Thank you for purchasing a StarTech.com video and audio splitter. Now you’ll be able to
broadcast the audio and video signals from one PC over multiple sound systems and
monitors. The built-in video amplifiers let you place your monitors up to 210 ft (65m)
away and still experience crystal-clear video signals with resolution up to 2048 x 1536
pixels. These switches are also daisy-chainable for future expansion and are compatible
with a wide range of monitors.
Features
•Allows one computer to provide simultaneous displays on two (ST122PROA), four
(ST124PROA), or eight (ST128PROA) different monitors with audio support
•Works with VGA, SVGA, XGA, QXGA, UXGA and Multisync monitors
•Provides a high video bandwidth (400 Mhz) for crystal clear 2048 x 1536 resolution
•Daisy chainable for almost unlimited expansion
•Uses a built-in video signal amplifier which allows a cable length of up to 210 ft
(65m)
•Uses standard monitor extension cables (StarTech.com coaxial VGA cables
recommended for best picture quality)
•Compatible with DDC, DDC2 & DDC2B (on Video Out port 1)
Before You Begin
To ensure a quick and easy device installation, please read through this section carefully
before attempting to install the device.
Requirements
•Computer with a HD-15 video port and a mini-stereo audio port
•VGA, SVGA, XGA, QXGA, UXGA or Multisync monitors with HD-15 connectors
•HD-15 monitor cables (like StarTech.com’s coaxial high-resolution video cables)
•Speakers or earphones with mini-stereo plugs
•Mini-stereo audio cables
Contents
This package should contain:
•1x Video splitter with audio
•1x Power adapter

3
Installation
This section will guide you through the installation of your video splitter. Please read
through the instructions carefully and complete each step in the order listed.
Note: If you are connecting the switch to a DDC monitor, the other monitors you connect
to the switch must be of the same resolution as the DDC monitor. The DDC monitor
must be plugged into Video Out port number 1.
1. Make sure that your computer and monitors are turned off.
2. Using an HD-15 video cable, connect your computer’s Video Out port to the Video In
port on the back of the switch.
3. Using a 3.5” audio cable, connect your computer’s Audio Out port to the Audio In
port on the back of the switch.
4. Plug your monitors (using either the built-in cables connected to your monitors or
the extension cables to your monitors) into the Video Out ports on the back
of the switch.
5. Plug your speakers/headphones (using either the speakers/headphones themselves
or the extension cables connected to them) into the Audio Out ports on the back of
the switch.
other end of the adapter into an available power source. The green Power LED on the
front will now be lit.
Cascade Configuration
Connect an HD-15 male-male cable between a Video Out port of the primary splitter (the
splitter connected to the computer) and the Video In port on the cascaded splitter. Do the
same with the audio ports.
Note: Adding too many layers of splitters may cause a decline in video and audio
quality.
6. Plug the power adapter into the AC power port on the back of the switch. Plug the

4
Technical Specifications
Input/Output Signal
Signal Type XGA, VGA, SVGA, QXGA, UXGA & Multisync
Cable Length 210ft (65m) maximum
Input Connectors 1 x HDDB15 (female)
1 x 3.5mm Audio Jack (female)
Output Connectors ST122PROA: 2 x HDDB15 (female)
2 x 3.5mm Audio Jack (female)
ST124PROA: 4 x HDDB15 (female)
4 x 3.5mm Audio Jack (female)
ST128PROA: 8 x HDDB15 (female)
8 x 3.5mm Audio Jack (female)
VGA Bandwidth 400 MHz
VGA Resolution 2046 x 1536 @ 60 Hz
Dimensions ST122PROA: 5.1 x 2.9 x 1.6” (130 x 75 x 42mm)
W x D x H ST124PROA: 7.8 x 2.9 x 1.6” ( 200 x 75 x 42mm)
ST128PROA: 13.5 x 2.9 x 1.6” (343 x 75 x 42mm)
Certifications FCC, CE
Pin Signal
1Red video
2Green video
3Blue video
4ID2
5Ground
6Analog ground
7Analog ground
8Analog ground
9NC
10 Ground
11 ID0
12 ID1
13 Horizontal sync
14 Vertical sync
15 ID3
ST128PROA: DC 12 V / 1.25 A
Power ST122PROA, ST124PROA: DC 12 V / 600 MA  

5
Technical Support
The following technical resources are available for this StarTech.com product:
On-line help:
We are constantly adding new information to the Tech Support section of our web site. To
access this page, click the Tech Support link on our homepage, www.startech.com. In the
tech support section there are a number of options that can provide assistance with this
product.
Knowledge Base - This tool allows you to search for answers to common issues using
key words that describe the product and your issue.
FAQ - This tool provides quick answers to the top questions asked by our customers.
Downloads - This selection takes you to our driver download page where you can
find the latest drivers for this product.
Call StarTech.com tech support for help:
USA/Canada: 1-519-455-4931
UK/Ireland/Europe: 00-800-7827-8324
Support hours: Monday to Friday 9:00AM to 5:00PM EST (except holidays)
Warranty Information
This product is backed by a one-year warranty. In addition, StarTech.com warrants its
products against defects in materials and workmanship for the periods noted,
following the initial date of purchase. During this period, the products may be
returned for repair, or replacement with equivalent products at our discretion. The
warranty covers parts and labor costs only. StarTech.com does not warrant its products
from defects or damages arising from misuse, abuse, alteration, or normal wear and
tear.
Limitation of Liability
In no event shall the liability of StarTech.com Ltd. and StarTech.com USA LLP (or their
officers, directors, employees or agents) for any damages (whether direct or indirect,
special, punitive incidental, consequential, or otherwise), loss of profits, loss of business,
or any pecuniary loss, arising out of or related to the use of the product exceed the actual
price paid for the product.
Some states do not allow the exclusion or limitation of incidental or consequential
damages. If such laws apply, the limitations or exclusions contained in this statement
may not apply to you.

Revised: November 24, 2003