Black Box AC155A User manual

Compact CAT5 Audio/Video Receiver
December 2001
AC155A
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
CUSTOMER
SUPPORT
INFORMATION

Compact CAT5 Audio/Video Receiver
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TRADEMARKS USED IN THIS MANUAL
BLACK BOX and its logo are registered trademarks of Black Box
Corporation.
Apple and Macintosh are registered trademarks of Apple Computer, Inc.
IBM is a registered trademark of International Business Machines
Corporation.
SGI is a registered trademark of Silicon Graphics, Inc.
Sun and Sun Microsystems are registered trademarks of Sun Microsystems,
Inc. in the United States and other countries.
Any other trademarks mentioned in this manual are acknowledged to be
the property of the trademark owners.

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FEDERAL COMMUNICATIONS COMMISSION
AND CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy
and if not installed and used properly, that is, in strict accordance with
the manufacturer’s instructions, may cause interference to radio
communication. It has been tested and found to comply with the limits
for a Class A computing device in accordance with the specifications in
Subpart B of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when the equipment is
operated in a commercial environment. Operation of this equipment in
a residential area is likely to cause interference, in which case the user
at his own expense will be required to take whatever measures may be
necessary to correct the interference.
Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate
the equipment.
This digital apparatus does not exceed the Class A limits for radio
noise emission from digital apparatus set out in the Radio Interference
Regulation of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques
dépassant les limites applicables aux appareils numériques de la classe
A prescrites dans le Règlement sur le brouillage radioélectrique publié
par le ministère des Communications du Canada.
EUROPEAN UNION DECLARATION OF CONFORMITY
This product complies with the requirements of the European EMC
directive 89/336/EEC

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Normas Oficiales Mexicanas (NOM)
Electrical Safety Statement
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas
antes de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo,
cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,
etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como
sea recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico
más allá a lo descrito en las instrucciones de operación. Todo otro
servicio deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama,
sofá, alfombra o superficie similar puede bloquea la ventilación, no se
debe colocar en libreros o gabinetes que impidan el flujo de aire por los
orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de
calor como radiadores, registros de calor, estufas u otros aparatos
(incluyendo amplificadores) que producen calor.

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11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo
del tipo descrito en el instructivo de operación, o como se indique en el
aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la
polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen
del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las
lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no
sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato;
o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

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Contents
1. Introduction ...............................................................................page 6
1.1 General ................................................................................page 6
1.2 Features ...............................................................................page 6
2. Installation .................................................................................page 7
3. Configuration & Operation........................................................page 9
4. Troubleshooting.......................................................................page 10
4.1 Problem Solving FAQ........................................................page 10
4.2 Calling Black Box..............................................................page 12
4.3 Shipping & Packaging........................................................page 12
5. Specifications...........................................................................page 13

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1. Introduction
1.1 General
The Model AC155A is a Receiver designed to be the counterpart for
the Models AC154A-2 and AC154A-8 Splitters. It converts the CAT5
signals sent from the Splitter back to standard VGA video and audio for
connection to standard VGA monitor and PC speakers.
The device is housed in a compact shielded enclosure and includes a
HD15 connector for the monitor, 3.5mm mini-stereo audio connector
for the speakers, and one RJ45 connector for the CAT5 cable input. A
small power adapter is included with the AC155A.
The AC155A can recover the VGA and audio signals from CAT5 LAN
cables up to 500 feet (152 meters) long with little to no degradation.
The Receiver features a proprietary circuit to compensate for signal
losses in long cable runs.
1.2 Features
•Buffered video and audio outputs
•Supports resolutions up to 1280x1024 at any refresh rate
•User selectable video compensation for receiving on CAT5
cables as long as 500 feet
•Rugged, Reliable, Compact size
•No software required
•Receives audio and video signals on one cable

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2. Installation
1. At the sending end, connect the AC 154A-2 or AC154A-8 to the
CPU and local monitor and keyboard per instructions given in their
User’s Manual.
2. Using Category-5 cable, connect the output of the Splitter to the
AC155A Receiver’s UTP IN connector (see Figure 2.2)
3. Connect a monitor and powered speakers to the Receiver’s VGA
and AUDIO OUT connectors.
4. Attach the supplied power adapter to the box and plug it in the AC
power outlet.
Figure 2.1
Figure 2.2 Figure 2.3

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CAUTION
Before plugging in your remote monitor, verify that the AC line is
properly wired and that a protective ground (green) wire is
established with NO potential difference between both the sender
and Receiver locations (The UTP Splitter can tolerate up to 5 v peak-
to-peak ground noise between the two locations) . Failure to ensure
good grounding can result in erratic operation and possible shock
hazards with severe damage to your equipment. If an LCD is being
used at the remote location, verify that the LCD ground is tied to
power-line ground. If not, then ground the Receiver unit by adding a
ground strap (see troubleshooting section for more information).
NOTICE
Do not connect this unit to any LAN device such as network cards
or hubs as this may damage the AC155A and/or the LAN device. Use
EIA/TIA 568B standard straight-through patch wiring as shown
below. Do not use crossover cables.
EIA/TIA 568B WIRING STANDARD
PIN Wire Color
1White w/ Orange Stripe
2Orange
3White w/Green Stripe
4Blue
5White w/Blue Stripe
6Green
7White w/Brown Stripe
8Brown

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3. Configuration & Operation
The only thing that requires configuration on the AC155A is the
COMPENSATION switch setting.
Please refer to Figure 2.2 for the location of the dip switch. The Switch
has two levers. When the lever is down the switch is ON.
Referring to Table 3.1 and set the dip switches according to the cable
length used.
S1/S2 Switch (Up = OFF) Cable Length
OFF/OFF position 0 to 125 feet
ON/OFF position 125 to 225 feet
OFF/ON position 225 to 375 feet
ON/ON position 375 to 500+ feet
The video quality at the remote station depends on the length of the
CAT5 cable, actual video resolution and refresh rate.
Refresh Rate
60 Hz 75 Hz 85 Hz
640x480 500 ft 500 ft 500 ft
800x600 500 ft 500 ft 400 ft
1024x768 500 ft 400 ft 350 ft
Resolution
1280x1024 500 ft 350 ft 300 ft
Table 3.2
Table 3.1

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4. Troubleshooting
4.1 Problem Solving FAQ
1. Fuzzy, blurry, or ghosting image at remote location
If you have a stable image but it looks somewhat blurry (object or
character edges are not sharp), make sure that you have set the Receiver
unit’s compensation switches correctly. Also check table 3.2 to see that
you have not exceeded the maximum cable length recommendation. If
you still have a fuzzy image, try reducing the refresh rate and/or
resolution of the PC.
If too much compensation is applied at the Receiver, a bright and
ghosting image may result. In this case try reducing the amount of
compensation.
2. Image exhibits steady or rolling horizontal color “hum” bars
This is usually an indication of improper grounding either at the
sending end, the receiving end, or both. Verify that the AC line is
properly wired and that a protective ground (green) wire is established
with NO potential difference between both the sender and Receiver
locations. The UTP Splitter can tolerate up to 5 v peak-to-peak ground
noise between the two locations, but no more.
The Splitters and Receivers rely on the equipment that are connected to
them to establish a good ground reference. Most monitors and PC’s are
well grounded to the power-line through their 3-Prong AC cord.
However some Notebooks and LCD’s may be completely floating even
when an external power supply is plugged into them. In this case, you
must add a wire from the Splitter or Receiver to “earth” ground. The
VGA and Audio connector shells and their respective hardware are all
tied to unit’s internal ground and can be used to establish a connection
to power-line ground.

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3. Shaking image or periodically blanking monitor
Although CAT5 cable uses twisted pairs to transmit the signals from the
Splitter to the Receivers to reduce the amount of EMI coupled noise
from other external sources, a strong electromagnetic noise field can
cause instability in the signal.
Usual sources of this form of noise coupling are high current AC lines
or other high-density data and/or control cables that run adjacent to and
parallel with a substantial length of the CAT5 cable. To eliminate this,
either place a distance between the CAT5 cables from the Splitter and
the interfering source, or use shielded CAT5 cables. Note that
separating the CAT5 cable from the EMI source by a few inches is
often sufficient to eliminate this problem.
4. The PC does not recognize a Plug-and-Play monitor
If the PC’s Operating System is setup to detect a plug-and-play monitor
(usually in Display Properties Advanced Settings), it may have trouble
finding a monitor if no local monitor is hooked up to the Splitter (at the
sending end). Only the ID information of the local monitor is passed to
the PC. If the PC does not produce an image due to this, either connect
a monitor to the local VGA output port, or disable the plug-and-play
monitor detection in the PC’s operating system.
5. Faint shadows or ghosts at the remote monitor
The Splitter at the sending end has multiple RJ45 output connectors.
When a long CAT5 cable is plugged in any of the outputs, the Splitter
expects a Receiver at the other end for proper termination. Therefore it
is a good idea to unplug the un-terminated CAT5 cables from the
Splitter unit. Please refer to item 1 above for other possible causes.

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6. Poor audio quality at the Receiver
Only use powered speakers with the Receiver. It is also good practice to
set the audio level (volume) output of the PC about 1/2 to 2/3 from the
maximum and use the volume knob of the speakers to adjust the volume
to the desired level. A low volume signal output from the PC reduces
the signal-to-noise (S/N) ratio, whereas too high output amplitude can
cause saturation and clipping to occur.
7. Substituting power supplies
The Receiver relies on the AC power adapter that is supplied with it.
The adapter generates a floating 12 v DC power for the unit. If you
intend to use a different external DC power that is referenced to ground,
the Receiver will not function properly.
4.2 Calling Black Box
If you determine that your Receiver is malfunctioning, do not attempt to
repair the unit. Contact Black Box Tech. Support at 724-746-5500.
Before you do, make a record of the history of the problem. We will be
able to provide more efficient and accurate assistance if you have a
complete description, including:
• The nature and duration of the problem;
• The components involved in the problem—that is, what type of
cable, makes and models of computers and monitors, etc.
• The results of any testing you’ve already done.
4.3 Shipping and Packaging
If you need to transport or ship your Receiver:
• Package it carefully. We recommend that you use the original
container.
• Before you ship the unit back to Black Box for repair or return,
contact us to get a Return Authorization (RA) number.

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5. Specifications
Compliance CE; FCC Part 15 Subpart B Class A, IC Class
Standards VGA, SVGA, or XGA video
Interfaces Video: VGA; CAT5: Non-Standard
Supported
Video Types VGA through XGA, RGBS, or RGsB (sync on green)
Resolution &
Refresh Rate Up to 1280 x 1024 non-interlaced at up to 85 Hz
Bandwidth Video: DC to 250 MHz, Audio: 20 Hz to 10 KHz
Video Level 0.7 volts peak-to-peak
Audio
Format Line level (100 Ohm), mono signal, on a standard
3.5mm stereo output connector
Maximum
Distance Up to 500 ft. (152 meters) –See table 3.2 for details
Connectors HD15 female for video, 3.5 mm Mini-Stereo for audio,
RJ45 for CAT5 A/V input
Maximum
Altitude 10,000 ft. (3048 m)
Temperature
Tolerance Operating: 32 to 122°F (0 to 50°C);
Storage: –40 to +185°F (–40 to +85°C)
Humidity Up to 95% non-condensing
Enclosure Steel

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MTBF 300,000 hours (calculated estimate)
Power From utility-power (mains) outlet, through included
external power adapters. Output Voltage: 12v DC
Center-Positive, floating (do not substitute any other
external power supply). Power supply current
requirements: 300 ma minimum
Size 1.22"H x 4.16"W x 2.60"D
Shipping
Weight 1.6 lb

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NOTES

© Copyright 2001. Black Box Corporation. All rights reserved.
1000 Park Drive Lawrence, PA 15055-1018 724-746-5500 Fax [phone]