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Black Box DB25 Manual
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Black Box DB25 Manual

Data broadcast
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JULY 1999
TL158A-R3
TL158AE-R3
DB25 Data Broadcast
D B - 8 / 2 5
E L
C H A N N
P W R
8
7
6
5
4
3
2
1
C O M P
CUSTOMER
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
SUPPORT
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com

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Summary of Contents for Black Box DB25

  • Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX SUPPORT FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 3 DB25 DATA BROADCAST TRADEMARKS USED IN THIS MANUAL Any trademarks used in this manual are acknowledged to be the property of the trademark owners.
  • Page 4 DB25 DATA BROADCAST FEDERAL COMMUNICATIONS COMMISSION INDUSTRY CANADA 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...
  • Page 5 DB25 DATA BROADCAST 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.
  • Page 6 DB25 DATA BROADCAST 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...

  • Page 7: Table Of Contents

    DB25 DATA BROADCAST Contents Chapter Page 1. Specifications ......................6 2. Introduction ......................7 3. Installation ......................8 4. Functional Description ..................9 5. Troubleshooting ....................10...

  • Page 8: Specifications

    DB25 DATA BROADCAST 1. Specifications Up to 19.2 kbps; the unit is transparent to data and Transmission Rate — code rate Interface — Each port individually DTE/DCE selectable (9) DB25 female Connectors — Indicators — (10) Red LEDs: PWR, Channels 1 through 8 active,...

  • Page 9: Introduction

    DB25 DATA BROADCAST 2. Introduction The DB25 Data Broadcast receives an asynchronous signal and redistributes it to up to eight slave devices. It can be used, for example, to distribute a signal from a computer to eight different terminals. The DB25 Data Broadcast takes the signal appearing at the composite connector (COMP), regenerates it, and distributes it to eight slave connectors (CH 1–8).

  • Page 10: Installation

    1. Remove power from the terminal or computer that will be connected to the DB25 Data Broadcast unit. 2. Connect the composite connector (labeled “COMP”) on the rear of the DB25 Data Broadcast to the source of data (usually a modem, multiplexor, or computer port).

  • Page 11: Functional Description

    DB25 DATA BROADCAST 4. Functional Description The DB25 Data Broadcast unit supports three leads on each port connector: Transmit Data (TXD), Receive Data (RXD), and Signal Ground (SG). The input to the composite “COMP” port is regenerated and simultaneously sent out on the output lead of each of the eight slave ports, channels 1 through 8.

  • Page 12: Troubleshooting

    Set the terminal to full-duplex mode. Then type a few letters. If you see those letters on the terminal screen, the DB25 Data Broadcast is working.
  • Page 13 © Copyright 1999. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...