StarTech.com ST121R User manual

VGA Video Extender
4-Port VGA over Cat5 Transmitter
ST1214T
ST121R
ST121EXT
Instruction Manual
VGA over Cat5 Receiver
VGA over Cat5 Extender

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.•
Use of Trademarks, Registered Trademarks, and other Protected Names and Symbols
This manual may make reference to trademarks, registered trademarks, and other
protected names and/or symbols of third-party companies not related in any way to
StarTech.com. Where they occur these references are for illustrative purposes only
and do not represent an endorsement of a product or service by StarTech.com, or an
endorsement of the product(s) to which this manual applies by the third-party company
in question. Regardless of any direct acknowledgement elsewhere in the body of
this document, StarTech.com hereby acknowledges that all trademarks, registered
trademarks, service marks, and other protected names and/or symbols contained in this
manual and related documents are the property of their respective holders.

i
Table of Contents
Introduction..................................................................... 1
Packaging Contents.....................................................................1
System Requirements .................................................................1
ST1214T......................................................................................2
ST121R .......................................................................................2
ST121EXT...................................................................................3
Installation....................................................................... 4
Hardware Installation...................................................................4
Driver Installation.........................................................................7
Operation......................................................................... 7
Signal Equalizer Selector (ST121R, ST121EXT) ........................8
Wiring Diagram ............................................................... 8
Specifications.................................................................. 9
Technical Support........................................................... 10
Warranty Information...................................................... 10

1
Introduction
The StarTech.com Converge A/V VGA over Cat5 Video Extender
system is comprised of a transmitter unit (ST1214T) and a receiver
unit (ST121R) and optionally a repeater unit (ST121EXT). This video
extender system allows you to split and extend a single VGA source
signal to up to four separate remote locations. The VGA signal is
extended using standard Cat5 UTP cable, with a maximum distance of
up to 150m (492ft) or 300m (984ft) with a repeater.
Packaging Contents
1 x ST1214T Transmitter Unit•
or
1 x ST121R Receiver Unit
or
1 x ST121EXT Extender Unit
1 x Universal Power Adapter•
1 x Mounting Bracket kit (ST121R and ST121EXT only)•
1 x Instruction Manual•
System Requirements
VGA enabled video source and display•
Available power outlet at local and remote locations•
Both a Transmitter Unit and Receiver Unit(s)•

2
RJ45
output
RJ45
output
Power
Connector
VGA input
(male)
VGA output
(female)
Power
Connector
VGA output
(female)
RJ45
output
Signal Equalizer
switch
ST1214T
ST121R

3
VGA output
(female)
Power
Connector
Signal Equalizer
switch
RJ45
output
RJ45
input
ST121EXT

4
Installation
NOTE: To prevent potential electrical damage to the units in some
environments, ensure that the chassis is properly grounded.
Hardware Installation
The following instructions detail how ST1214T, ST121R and
ST121EXT can be used to extend a VGA signal to remote displays,
using a variety of different configurations.
ST1214T (local) and ST121R (remote)
Using the ST1214T, you can split the VGA signal from the source1.
into 4 separate VGA signals, for reception at remote locations (up to
150m (492ft) away).
Situate the ST1214T so that it is near your VGA video source as well2.
as an available power source.
Connect the ST1214T to the power source, using the power adapter3.
provided.
Connect the VGA video source to the VGA IN port on the ST1214T,4.
using a male-female VGA cable.
Situate the ST121R so that it is near the intended remote display(s)5.
and an available power source.
Connect the ST1214R to the power source using the power adapter6.
provided.
Using the Monitor Out ports, connect the ST121R to the display(s).7.
Please note that each remote unit can be connected to two separate
displays simultaneously. To connect two monitors, simply connect a
VGA cable from the second Monitor Out port to a second display.
Once the Transmitter and Receiver unit(s) have been positioned,8.
connect the Cat5 OUT ports provided by the transmitter unit
(ST1214T) to each receiver unit, using standard UTP cable, with
RJ45 connectors on each end.

5
The following diagram illustrates the connection between transmitter
(ST1214T) and receiver (ST121R) units.
ST1214T (local), ST121EXT (extender) and ST121R (Remote)
Using the ST1214T, you can split the VGA signal from the source into
4 separate VGA signals, for reception at remote locations. While the
maximum transmission distance of the ST1214T is 150m (492ft), using
ST121EXT as a signal repeater adds another 150m (492ft) to the total
transmission distance, for a total extension of 300m (984ft).
Situate theST1214T so that it is near your VGA video source as well1.
as an available power source.
Connect the ST1214T to the power source, using the power adapter2.
provided.
Connect the VGA video source to the VGA IN port on the ST1214T,3.
using a standard male-female VGA cable.
Situate the repeater unit (ST121EXT) up to 150m (492ft) away from4.
the ST1214T unit, ensuring that the repeater unit is able to connect
to an available power outlet.
VGA cable
Cat5 cables
(150m max)
VGA cables
Video Source
Remote
Displays
ST1214T
ST121R

6
Using a standard UTP cable with RJ45 terminators on each5.
end, connect the Cat5 OUT port provided by the transmitter
unit(ST1214T) to the Cat5 IN port provided by ST121EXT.
Connect the repeater unit (ST121EXT) to an available power outlet,6.
using the adapter provided.
Optional:7. You can connect two monitors directly to the repeater. To
do so, simply connect the monitors to the MONITOR OUT ports on
the repeater unit.
Repeat step 4 to 7 for each remote unit that will be used in8.
conjunction with a repeater (up to 4).
Situate the receiver unit (ST121R) up to 150m (492ft) away from the9.
repeater unit (ST121EXT), so that it is near the intended display(s)
as well as an available power source.
Connect the ST121R Receiver Unit to the power source using the10.
power adapter provided.
Using a standard UTP cable with RJ45 terminators on each end,11.
connect the Cat5 OUT port provided by the repeater (ST121EXT)
to the Cat5 IN port provided by ST121EXT.
Note: Each receiver unit can be connected to two separate displays
simultaneously. To connect two monitors, simply connect a VGA cable
from the second Monitor Out port to a second display.

7
The following diagram illustrates the connection between transmitter
(ST1214T) and receiver (ST121R) units, with the addition of a repeater
unit (ST121EXT). Please note that although only one repeater is used
in this illustration, up to four can be used simultaneously.
Driver Installation
No driver installation is required for this video extender as it is an
external hardware only solution, invisible to the computer system.
Operation
ST1214T, ST121EXT and ST121R all provide LED indicators, allowing
simple operating status monitoring. Once the power adapter has been
connected, the Power LED will become illuminated; similarly, when
the unit is in use (i.e. transmitting a video signal), the Active LED will
become illuminated.
Video Source
VGA cable
Cat5 cables
(max 150m)
Remote
Displays
ST1214T
ST121R
ST121EXT
ST121R

8
Signal Equalizer Selector (ST121R, ST121EXT)
The Signal Equalizer Selector on the Receiver and Repeater Units
can be adjusted to obtain the optimal video signal for various cable
lengths. There are four settings on the selector switch, indicating cables
of different lengths. The following table can be used as a reference for
selecting the appropriate setting:
Wiring Diagram
The Video Extenders requires an unshielded twisted pair Cat5 cable
no longer than 150m (492ft). The cable must be wired according to the
EIA/TIA 568B industry standard as shown below.
Pin Wire Color Pair
1 White/Orange 2
2 Orange 2
3 White/Green 3
4 Blue 1
5 White/Blue 1
6 Green 3
7 White/Brown 4
8 Brown 4

9
Specications
ST1214T
Connectors
1 x DE-15 VGA male
1 x DE-15 VGA female
4 x RJ45
1 x Power Connector
LEDs Power, Active
Maximum Distance 150m (492 ft) @ 1024x768
Power Supply 12VDC, 1.5A
Dimensions 63.89mm x 103.0mm x 20.58mm
Weight 246g
ST121R ST121EXT
Connectors
2 x DE-15 female
1 x RJ45
1 x Power Connector
2 x DE-15 female
2 x RJ45
1 x Power Connector
LEDs Power, Active
Power Supply 12VDC, 1.5A
Dimensions 84.2mm x 65.0mm x
20.5mm
64.0mm x 103.0mm x
20.6mm
Weight 171g 204g

10
Technical Support
StarTech.com’s lifetime technical support is an integral part of our
commitment to provide industry-leading solutions. If you ever need
help with your product, visit www.startech.com/support and access
our comprehensive selection of online tools, documentation, and
downloads.
Warranty Information
These products are 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.

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