Black Box IC443A User manual

CUSTOMER
SUPPORT
INFORMATION
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]
FEBRUARY 1998
IC443A
Video Mono Audio Baluns
AUDIO 1
PAIR 1
(4 & 5)
Video Mono
Audio Balun
VIDEO 1
PAIR 4
(7 & 8)
AUDIO 2
PAIR 2
(3 & 6)
VIDEO 2
PAIR 3
(1 & 2)

3
FCC/IC RFI STATEMENTS
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
Class B Digital Device. This equipment has been tested and found to comply with
the limits for a Class B computing 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 telephone
reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one 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 an experienced radio/TV technician for help.
Caution: Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
To meet FCC requirements, shielded cables and power cords are required to
connect this device to a personal computer or other Class B certified device.
This digital apparatus does not exceed the Class B 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 classe B prescrites dans le Règlement sur le brouillage
radioélectrique publié par le ministère des Communications du Canada.

4
VIDEO MONO AUDIO BALUNS
Contents
Chapter Page
1. Specifications ............................................................................................. 5
2. Introduction ............................................................................................... 7
3. Installation .................................................................................................. 8
4. Troubleshooting ...................................................................................... 11
4.1 Things to Try if a Problem Occurs .................................................. 11
4.2 Calling Black Box .............................................................................. 12
4.3 Shipping and Packaging ................................................................... 12

5
CHAPTER 1: Specifications
1. Specifications
Cable Required — Between Balun pairs: (1) Unshielded twisted pair (UTP)
cable:
Construction Standard: Category 3 or higher;
Gauge: 24 AWG or lower
Termination: RJ-45 plugs;
Pairs: Four (8 wires used) to carry all video and
audio channels;
Impedance: 100 ohms at 1 MHz;
Maximum Capacitance: 20 pF/ft. (6.1 pF/m);
Maximum Attenuation: 6.6 dB/1000 ft. (2 dB/km);
To attached devices:
Video: (1) Standard 75-ohm coaxial cable with a BNC
male connector on the Balun end;
Audio: (2) Standard RCA phono cables
Compliance — FCC Class B, DOC Class/MDC classe B;
CISPR Pub. 22 Class B
Standard — Composite (baseband) video: NTSC, PAL, or SECAM
Impedance — Coaxial side: 75 ohms;
Phono side: 600 ohms;
UTP side: 100 ohms
Bandwidth — Video: DC to 10 MHz;
Audio: 20 Hz to 50 KHz
Maximum RF
Input — 1.1 volts at 60 Hz
Insertion Loss — Less than 2 dB over the DC-to-10-MHz frequency range
Return Loss — Greater than 15 dB over the DC-to-10-MHz frequency
range
Common-Mode
Rejection — Greater than 40 dB at 10 MHz

6
VIDEO MONO AUDIO BALUNS
Maximum
Distance — With Category 3 cable: 1200 ft. (365.8 m) for color video,
1500 ft. (457.2 m) for black & white video and for audio;
With Category 5 cable: 2200 ft. (670.6 m) for color video,
2500 ft. (762 m) for black & white video and for audio
Connectors — (1) Shielded RJ-45 female, (1) BNC female, (2) RCA
female
RJ-45 Pins Used — Pins 1 (audio right), 2 (audio right ground), 3 (audio
left), 6 (audio left ground), 7 (video), and 8 (video
ground)
Temperature
Tolerance — Operating: 32 to 131˚ F (0 to 55˚ C);
Storage: –4 to 185˚ F (–20 to 85˚ C)
Humidity
Tolerance — Up to 95% noncondensing
Size — 2.3"H x 2.4"W x 1"D (5.7 x 6.1 x 2.5 cm)
Weight — 2.8 oz. (80 g, 0.2 lb., 0.1 kg)

7
CHAPTER 2: Introduction
2. Introduction
With the Video Mono Audio Balun, you can transmit two pairs of composite
baseband video and mono audio signals across Category 3 or better unshielded
twisted-pair (UTP) cable, which is already wired into most commercial sites. Use
pairs of Baluns to transmit composite video with mono audio: In a normal two-way
(full-duplex) application, the Balun on each end takes a single composite
baseband video signal and a monaural audio signal from 600-ohm RCA type phono
cables, converts the signals, and transmits them over UTP cable to the other Balun,
which converts them back and sends them to their destination. (If your application
needs both sets of signals to travel in the same direction, the Baluns can do this
too.)
Connect the Video Mono Audio Balun to a site’s structured cabling through a
modular wall jack in the work area. Each Balun has four RCA connectors at one
end and an RJ-45 jack at the other end.
The Video Mono Audio Balun is designed for use with CCTV cameras and
monitors, videocassette recorders, camcorders, and other baseband audiovisual
equipment, but is especially useful in two-way videoconferencing applications.

8
VIDEO MONO AUDIO BALUNS
3. Installation
To install a pair of Video Mono Audio Baluns, take these steps:
CAUTION!
Do not attempt to open the housing. There are no user-serviceable parts
inside the Video Mono Audio Balun. Opening the unit will void your
warranty.
1. Make sure that the video devices at either end are not too far away from each
other (refer to the Maximum Distance specification in Chapter 1). If either
device is beyond the reach of the Balun at the other end, the signals the
device receives will be weak or nonexistent.
2. Follow the manufacturer’s instructions for (a) turning off power to the video
and audio equipment you will be attaching and (b) disconnecting that
equipment from AC power and from all other devices.
3. Make certain that the telecommunications outlets and cross-connects to
which you will connect the Baluns are configured properly and are labeled so
that the circuit can be identified.
4. Verify that the twisted-pair circuit you want to use is not already being used
for other LAN or telephone equipment.
CAUTION!
Do not connect the Video Mono Audio Balun to a telecommunication
outlet wired to unrelated equipment. Making such a connection may
damage the equipment and/or the Balun. Please make sure that all
wiring is straight-through-pinned.
Do not mount the Video Mono Audio Balun over equipment-
ventilation openings. Covering the openings may cause the equipment
to overheat.
5A. If your application is two-way (that is, one pair of audio/video signals going one
direction and one pair going the other direction): Run four RCA phono cables from
each balun to the attached device: one to the device’s VIDEO AUX IN port,
one to the device’s VIDEO AUX OUT port, one to the AUDIO IN port, and
the fourth to the AUDIO OUT port. (These cables must have RCA male
connectors on the Balun end.) Make sure that the VIDEO IN and AUDIO IN
ports on one end are connected to the VIDEO OUT and AUDIO OUT ports
on the other. Refer to Figure 3-1 on the next page.

9
CHAPTER 3: Installation
5B. If your application is one-way (that is, both pairs of audio/video signals going the same
direction): Run four RCA phono cables from each Balun to the attached
device. On the source devices, these cables should go to the VIDEO AUX
OUT and AUDIO OUT ports; on the destination devices, these cables should
go to the VIDEO AUX IN and AUDIO IN ports. (These cables must have RCA
male connectors on the Balun end.) Refer to Figure 3-1 below.
Figure 3-1. The Balun and its connectors.
6. Connect one end of a UTP cable into each Balun’s RJ-45 modular jack. To
carry the first video signal, these cables must carry a wire pair pinned to RJ-45
Pins 7 and 8. To carry the second video signal, the cables must carry a pair
pinned to Pins 1 and 2. To carry the first audio signal, the cables must carry a
pair pinned to Pins 4 and 5. To carrythe second audio signal, the cables must
carry a pair pinned to Pins 3 and 6.
7. Plug the other end of each UTP cable into the appropriate video wall outlet
or patch panel. When this is done, a complete cabling circuit should run
between the two baluns, as shown in Figure 3-2 below.
Figure 3-2. Two Baluns cabled together.
VIDEO 1
PAIR 4
(7 & 8)
VIDEO 2
PAIR 3
(1 & 2)
AUDIO 2
PAIR 2
(3 & 6)
Video Mono
Audio Balun
AUDIO 1
PAIR 1
(4 & 5)
VIDEO 1
PAIR 4
(7 & 8)
VIDEO 2
PAIR 3
(1 & 2)
AUDIO 2
PAIR 2
(3 & 6)
Video Mono
Audio Balun
AUDIO 1
PAIR 1
(4 & 5)
VIDEO 1
PAIR 4
(7 & 8)
VIDEO 2
PAIR 3
(1 & 2)
AUDIO 2
PAIR 2
(3 & 6)
Video Mono
Audio Balun
AUDIO 1
PAIR 1
(4 & 5)
RJ-45 for UTP
Category 3 or
higher UTP

10
VIDEO MONO AUDIO BALUNS
8. Reconnect and power up the video and audio equipment.
Your Video Mono Audio Balun system should be ready for continuous operation.

11
CHAPTER 4: Troubleshooting
4. Troubleshooting
4.1 Things to Try If Problems Occur
If at any time your Video Mono Audio Balun system does not seem to be working
properly, take these steps:
1. Following the manufacturer’s instructions, perform diagnostics on your video
and/or audio equipment, and verify that it works independently when the
Baluns are not involved.
2. If this doesn’t solve the problem, check all cable connections and the integrity
of your site wiring. Make sure video cables go to video devices, audio cables go
to audio devices, and that inputs on one end are wired to outputs on the
other.
3. You might be trying to transmit the audio/video signals across too great a
length of cable. The maximum distance over which the Baluns can transmit
and receive video signals depends on your cable and your video and audio
equipment; refer to the Maximum Distance specification in Chapter 1.
4. Make sure that the Baluns and all attached cables and equipment are well
away from neon lights, generators, electric motors, high-voltage lines, and
other sources of high-voltage or high-frequency electromagnetic signals.
5. Make sure that the patch cord you are running beteen the Balun and your
site’s wiring system is the correct cable type and is properly pinned (see the
Cable Required specification in Chapter 1).
6. If possible, replace the Video Mono Audio Baluns involved in the problem
with Video Mono Audio Baluns that are known to be working, one at a time.
If at any point the problem goes away, there is probably a defect in the Balun
you just replaced.
7. If you still cannot diagnose the problem, call Black Box for technical support
as described in the next section.