Black Box DB25 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]
JULY 1999
TL158A-R3
TL158AE-R3
DB25 Data Broadcast
DB-8/25
COMP 12345678PWR
CHANNEL

1
DB25 DATA BROADCAST
TRADEMARKS USED IN THIS MANUAL
Any trademarks used in this manual are acknowledged to be the property of the
trademark owners.

2
DB25 DATA BROADCAST
FEDERAL COMMUNICATIONS COMMISSION
AND
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
and found to comply with the limits for a Class A computing device in accordance
with the specifications in Subpart J 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 Industry Canada.
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 Industrie Canada.

3
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.
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.
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.

4
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
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.

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

6
DB25 DATA BROADCAST
1. Specifications
Transmission Rate — Up to 19.2 kbps; the unit is transparent to data and
code rate
Interface — Each port individually DTE/DCE selectable
Connectors — (9) DB25 female
Indicators — (10) Red LEDs: PWR, Channels 1 through 8 active,
COMP active
MTBF — 250,000 hours (ground benign environment)
Enclosure — Metal
Power Input to Wall-
Mount Transformer — TL158A-R3: 115 VAC, 60 Hz @ 50 mA; TL158AE-R3:
230 VAC, 50 Hz @ 25 mA
Power Consumption — 6 watts
Size — 2.3"H x 12.1"W x 11.2"D (5.8 x 30.7 x 28.4 cm)
Weight — 7 lb., 2.3 oz. (3.24 kg) without power supply; 8 lb.,
5.1 oz. (3.77 kg) with power supply

7
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).

8
DB25 DATA BROADCAST
3. Installation
The shipping container should include this manual, the DB25 Data Broadcast, and
the wall-mount transformer.
An optional rackmount kit (part number TL486) is available.
To install the DB25 Data Broadcast:
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). The length of this cable should not exceed 50 feet (15.2 m) in
most applications without using extended-distance cable. Set the DTE/DCE
jumper as appropriate.
NOTE
If connecting to a modem, multiplexor, or terminal/printer port on a
computer, select DTE. The connector will output data on pin 2 and input
data on pin 3.
If connecting to the COM port, terminal, or printer, select DCE. The
connector will output data on pin 3 and input data on pin 2.
3. Connect up to eight slave devices (usually terminals or printers) to the channel
connectors of the DB25 Data Broadcast. The length of these cables should not
exceed 50 feet (15.2 m) in most applications without using extended-distance
cable. Set the DCE/DTE jumper for each port as appropriate. (See the Note
above.)
4. Plug the wall-mount transformer into a wall socket. The red PWR (power) light
should be ON.
5. Apply power to the master and slave devices.
6. The DB25 Data Broadcast is now ready for operation.

9
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.
The input into each of the slave ports is regenerated, ORed together, and
assembled to produce the output signal which is transmitted from the composite
port. The signals grounds for all of the ports are tied together.
RTS, CTS, DTR, DSR, and CD are also supported and looped back as shown in the
following pin diagram.
Figure 1. Pin Designations for the DB25 Connectors.
The front-panel indicators show the presence of primary power when the red PWR
light is on. The state of the composite input signal is indicated by the COMP LED
lighting whenever a “SPACE” is detected. The state of each slave port’s input signal
is indicated by the CH 1–2 LED lighting whenever a “SPACE” is detected.
2 (TXD)
3 (RXD)
4 (RTS)
5 (CTS)
6 (DSR)
8 (CD)
20 (DTR)
7 (SG)
OUTPUT DATA
RECEIVE DATA
DTE
JUMPER
DCE
JUMPER
SIGNAL GROUND

10
DB25 DATA BROADCAST
5. Troubleshooting
The most effective way to troubleshoot a system using the DB25 Data Broadcast is
to bypass the DB25 Data Broadcast completely and connect one of the slave devices
(such as a terminal) directly to the source equipment (computer port, modem, or
concentrator). If the problem is corrected with the Data Concentrator out of the
circuit, inspect the unit closely for loose connections. If the unit is defective, return
it for repair.
A loopback connector and an asynchronous terminal (or a PC with a terminal-
emulation program) may also be used to check the DB25 Data Broadcast. Connect
the terminal to the composite channel and connect the loopback connector, in
turn, to each of the slave channels. 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.
Common Problems and Their Causes
Problem Cause
No indicator lights. Unpowered wall outlet.
Wallmount transformer loose in wall socket.
Defective DB25 Data Broadcast.
No Composite channel data light Data source not functioning.
(COMP) and no data received by Cable not connected.
slave devices. Defective DB25 Data Broadcast.
Composite channel data light Slave devices not plugged in or not turned on.
(COMP) “On” but no data Data cables not connected.
received by slave devices. Defective DB25 Data Broadcast.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1999. Black Box Corporation. All rights reserved.