Black Box IC443A Manuale utente

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 724-746-0746

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)

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.

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

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

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)

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.

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.

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

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.

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.

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