Black Box IC441A 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

IC441A

Video Stereo Audio Baluns

VIDEO

PAIR 4

(7 & 8)

AUDIO(L)

PAIR 2

(3 & 6)

AUDIO(R)

PAIR 3

(1 & 2)

Video Stereo

Audio Balun

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 STEREO AUDIO BALUNS

Contents

Chapter Page

1. Specifications ............................................................................................. 5

2. Introduction ............................................................................................... 7

3. Installation .................................................................................................. 8

4. Troubleshooting ...................................................................................... 10

4.1 Things to Try if a Problem Occurs .................................................. 10

4.2 Calling Black Box .............................................................................. 11

4.3 Shipping and Packaging ................................................................... 11

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: 3 or more (6 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 STEREO 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 Stereo Audio Balun, you can transmit composite baseband video

and 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

standard NTSC, PAL, or SECAM composite video with stereo audio: The Balun

near the media source takes a single composite baseband video signal from 75-ohm

coaxial cable, as well as left and right audio signals from two 600-ohm 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.

Connect the Video Stereo Audio Balun to a site’s structured cabling through a

modular wall jack in the work area. Each Balun has a BNC connector and two RCA

connectors at one end and an RJ-45 jack at the other end.

The Video Stereo Audio Balun is designed for use with CCTV cameras and

monitors, video-cassette recorders (NTSC, PAL, or SECAM), video-conferencing,

and other baseband audiovisual equipment. Applications include: security/

surveillance monitoring, video bulletin boards, financial information services, news

services, education, video training, airport displays, video capture, and

informational displays in stock exchanges, hotels, and convention centers.

VIDEO STEREO AUDIO BALUNS

3. Installation

To install a pair of Video Stereo Audio Baluns, take these steps:

CAUTION!

Do not attempt to open the housing. There are no user-serviceable parts

inside the Video Stereo Audio Balun. Opening the unit will void your

warranty.

1. Make sure that the video-destination device is not too far away from the

media-source device(s) (refer to the Maximum Distance specification in

Chapter 1). If the destination device is beyond the reach of the source Balun,

the signals the device receives will be weak or nonexistent.

2. Follow the manufacturer’s instructions for turning off power to the video and

audio equipment you will be attaching, and 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 Stereo 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 Stereo Audio Balun over equipment-

ventilation openings. Covering the openings may cause the equipment

to overheat.

5. For each Balun—depending on what type of video equipment you are

attaching it to—either plug its BNC female connector directly into the

device’s BNC male connector, or plug the Balun into a cable that runs to the

device (this cable must have a BNC male connector on the Balun end). You

can also run phono cables from your audio source(s) and plug them into the

Balun’s RCA phono jacks; you can use one or both of the audio channels, as

appropriate for your application. Refer to Figure 3-1 on the next page.

CHAPTER 3: Installation

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 video signal, these cables must carry a wire pair pinned to RJ-45

Pins 7 and 8. To carry the left audio signal, the cables must carry a pair

pinned to Pins 3 and 6. To carrythe right audio signal, the cables must carry a

pair pinned to Pins 1 and 2.

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.

8. Reconnect and power up the video and audio equipment.

Your Video Stereo Audio Balun system should be ready for continuous operation.

VIDEO

PAIR 4

(7 & 8)

AUDIO(R)

PAIR 3

(1 & 2)

AUDIO(L)

PAIR 2

(3 & 6)

Video Stereo

Audio Balun

VIDEO

PAIR 4

(7 & 8)

AUDIO(R)

PAIR 3

(1 & 2)

AUDIO(L)

PAIR 2

(3 & 6)

Video Stereo

Audio Balun

VIDEO

PAIR 4

(7 & 8)

AUDIO(R)

PAIR 3

(1 & 2)

AUDIO(L)

PAIR 2

(3 & 6)

Video Stereo

Audio Balun

RJ-45 for UTP

Category 3 or

higher UTP

VIDEO STEREO AUDIO BALUNS

4. Troubleshooting

4.1 Things to Try If Problems Occur

If at any time your Video Stereo 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.

2. If this doesn’t solve the problem, check all cable connections and the integrity

of your site wiring.

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 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).

5. If possible, replace the Video Stereo Audio Baluns involved in the problem

with Video Stereo 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.

6. If you still cannot diagnose the problem, call Black Box for technical support

as described in the next section.

CHAPTER 4: Troubleshooting

4.2 Calling Black Box

If you determine that a Video Stereo Audio Balun is malfunctioning, do not attempt

to alter or repair the unit. It contains no user-serviceable parts. Contact Black Box

Technical 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.

• when the problem occurs.

• the components involved in the problem.

• any particular application that, when used, appears to create the problem or

make it worse.

• the results of any testing you’ve already done.

4.3 Shipping and Packaging

If you need to transport or ship your Video Stereo Audio Balun:

• Package it carefully. We recommend that you use the original container.

• If you ever ship the Balun back to us for any reason, contact Black Box to get a

Return Materials Authorization (RMA) number.

Indice

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