Black Box ME935A Manuale utente

CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)

FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

NOVEMBER 2000

ME935A

Async Short-Haul Modem MP

Power TD RD

Control

OUT Loopback

Test

TRADEMARKS

Trademarks

AT&T is a registered trademark of American Telephone and Telegraph Company.

Any other trademarks mentioned in this manual are acknowledged to be the

property of the trademark owners.

ASYNC SHORT-HAUL MODEM MP

FEDERAL COMMUNICATIONS COMMISSION

AND

CANADIAN DEPARTMENT OF COMMUNICATIONS

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 the Canadian Department of

Communications.

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 le ministère des Communications du Canada.

NOM STATEMENT

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.

ASYNC SHORT-HAUL MODEM MP

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.

CONTENTS

Contents

Chapter Page

1. Specifications............................................................................................................6

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

2.1 Overview ..........................................................................................................7

2.2 Features ..........................................................................................................7

3. Configuration ..........................................................................................................8

3.1 Quick Set-Up Instructions..............................................................................8

3.1.1 Point-To-Point Configuration ..............................................................8

3.1.2 Multipoint Configuration ....................................................................8

3.2 DCE/DTE Switch Settings ............................................................................9

3.3 Special Configuration ....................................................................................9

4. Installation..............................................................................................................11

4.1 Twisted-Pair Wiring Overview......................................................................11

4.1.1 Twisted-Pair Connection Using Terminal Blocks ............................12

4.1.2 Twisted-Pair Connection Using RJ-11 ................................................12

4.2 Wiring For Multipoint Circuits....................................................................13

4.2.1 Daisychain Topology ..........................................................................13

4.2.2 Star Topology ......................................................................................14

4.3 RS-232 Connection ......................................................................................14

5. Operation ..............................................................................................................15

5.1 LED Indicators..............................................................................................15

5.2 Loopback Test Modes ..................................................................................15

5.2.1 Local Analog Loop ..............................................................................15

5.2.2 Remote Analog Loop ..........................................................................16

6. Troubleshooting ....................................................................................................17

Appendix A. Cable Recommendations ....................................................................19

Appendix B. Interface Pin Assignments....................................................................20

Appendix C. Block Diagram ......................................................................................21

ASYNC SHORT-HAUL MODEM MP

1. Specifications

Transmission Format— Asynchronous

Transmission Line— 19 to 26 AWG twisted pair

Range— See table in Appendix A

Serial Interface— EIA RS-232 (CCITT V.24), DB25 female

Twisted-Pair Interface— Terminal blocks, RJ-11 jack

Data Rates— Up to 115,200 bps

Applications— Point-to-point, multipoint

Indicators— Tri-state for transmit data, receive data, control in,

control out; dual-state for power, loopback test

Diagnostics— Local Analog Loopback (LAL), Remote Analog

Loopback (RAL)

Optical Isolation— 2500V RMS minimum

Surge Suppression— Over-voltage protection for opto-isolators via Silicon

Avalanche Diodes

Temperature Range— 32 to 140°F (0 to 60°C)

Humidity Tolerance— 5 to 95%, noncondensing

Maximum Altitude Range— Up to 15,000 feet (4572 m)

Power Supply— Wallmount, outputs 10 VAC, 700 ma

Size— 1.5"H x 4.1"W x 5"D (3.8 x 10.4 x 12.7 cm)

Weight— 13.2 oz. (374.2 g) without transformer

CHAPTER 2: Introduction

2. Introduction

2.1 Overview

The Async Short-Haul Modem MP is equipped with a virtual wish list of “bells and

whistles.” Point-to-point or multipoint applications are supported. Two separate

control signals may be passed (one each way), each with switch-selectable pin

assignments. Data lines are protected from ground loops and electrically volatile

environments by optical isolation and Silicon Avalanche Diodes. System integrity

can be evaluated using two built-in test modes: local analog loopback and remote

analog loopback. Tri-state LEDs monitor transmit data, receive data, and control

signals. Finally, 4-wire connections may be made using either RJ-11 jack or terminal

blocks—both are included.

In addition, the Async Short-Haul Modem MP is perfect for low-power RS-232

environments. The Modem is AC powered, and therefore is the recommended

solution for RS-232 environments whose interface voltages are below RS-232

specifications. The Modem supports data rates to 115.2 kbps and extends RS-232

transmission distances up to 14 miles (22.5 km) over two twisted pairs.

The Modem is housed in a sturdy metal case and comes with either 115 or 220V

external transformers.

2.2 Features

• Data rates to 115.2 kbps.

• Built-in optical isolation and high-speed surge protection.

• Distances up to 14 miles (19 AWG TWP @ 1200 bps).

• Tri-state LED indicators.

• Point-to-point or multipoint applications.

• Local and remote loopback test modes.

• DCE/DTE switch-selectable.

• Hardware and software flow control support.

• Externally powered.

ASYNC SHORT-HAUL MODEM MP

3. Configuration

The Async Short-Haul Modem MP features externally accessible configuration

switches (two DCE/DTE switches and a DIP-switch set), located on the underside

of the unit; there is no need to open the case to configure the Modem.

3.1 Quick Set-Up Instructions

In the majority of applications, you won’t need an in-depth knowledge of the

Modem’s capabilities to get up and running. The following quick-setup DIP-switch

configurations cover most Modem operating environments. (Note that DIP-switch

8 is not used.)

3.1.1 P

OINT

-T

-P

OINT

ONFIGURATION

If you are installing these Modems in a point-to-point application with a computer,

printer, or terminal, configure the DIP switches on both Modems as follows:

Switch Number 1 2 3 4 5 6 7

Positions OFF OFF OFF ON ON ON OFF

3.1.2 M

ULTIPOINT

ONFIGURATION

The Modem supports multipoint operation in either daisychain or star

configurations.

In a multipoint topology, you must configure the master Async Short-Haul Modem

MP’s DIP switches differently than those of the slave Modems. These are the

proper DIP-switch settings for a daisychain topology:

Switch Number 1 2 3 4 5 6 7

Master Positions ON ON ON OFF OFF OFF OFF

Slave Positions ON ON ON OFF OFF OFF ON

CHAPTER 3: Configuration

3.2 DCE/DTE Switch Settings

Correct setting of the DCE/DTE switches eliminates the need for RS-232 crossover

cables. If the RS-232 device you are connecting to the Modem is a PC, terminal, or

host (or is wired like one), set both of the DCE/DTE switches to DCE. If the RS-

232 device you are connecting to the Async Short-Haul Modem MP is a modem or

multiplexor, or is wired like one, set both of the DCE/DTE switches to DTE.

3.3 Special Configuration

If your Modem requires special configuration, use Table 3-1 as a guide. This table

shows all of the possible Modem switch settings. Following the table are brief

descriptions of the Control Input, Control Output, +Voltage Output and Carrier

Controlled by (Cin) parameters shown in the table.

Table 3-1. All possible switch settings for the Modem

Control Control +Voltage Carrier Switch Settings

Mode Input Output Output Controlled

(DCE/DTE) (CIn)(C

Out)(V

Out) by (CIn)1234567

DCE 4 8 6 Disabled ON ON ON OFF OFF OFF OFF

DCE 4 8 6 Enabled ON ON ON OFF OFF OFF ON

DCE 4,11,20* 8 6 Disabled OFF ON ON ON OFF OFF OFF

DCE 4,11,20* 8 6 Enabled OFF ON ON ON OFF OFF ON

DCE 4 6 8 Disabled ON OFF OFF OFF ON ON OFF

DCE 4 6 8 Enabled ON OFF OFF OFF ON ON ON

DCE 4,11,20* 6 8 Disabled OFF OFF OFF ON ON ON OFF

DCE 4,11,20* 6 8 Enabled OFF OFF OFF ON ON ON ON

DTE 8 4 11,20** Disabled ON ON ON OFF OFF OFF OFF

DTE 8 4 11,20** Enabled ON ON ON OFF OFF OFF ON

DTE 5,6,8* 4 11,20** Disabled OFF ON ON ON OFF OFF OFF

DTE 5,6,8* 4 11,20** Enabled OFF ON ON ON OFF OFF ON

DTE 8 11,20** 4 Disabled ON OFF OFF OFF ON ON OFF

DTE 8 11,20** 4 Enabled ON OFF OFF OFF ON ON ON

DTE 5,6,8* 11,20** 4 Disabled OFF OFF OFF ON ON ON OFF

DTE 5,6,8* 11,20** 4 Enabled OFF OFF OFF ON ON ON ON

*Multiple input pins are "or-tied"—if any input goes low, carrier is dropped.

**Multiple output pins generate the same signal simultaneously.

Indice

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