Black Box USB Director RS-232 Manual de usuario

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]

MARCH 2001

ME380A

19.2-kbps RS-232 Long-Haul Modem

(LHM-19.2)

LHM-19.2

PATT

REM

ANA

DIG

PWR RTS TD RD DCD TEST SQ

FCC/IC RFI STATEMENTS, SAFETY WARNING, TRADEMARKS

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.

EN 55022 warning: This is a Class A product. In a domestic environment, it might

cause radio interference. If it does, the user might be required to take adequate

measures to correct the interference.

Safety warning: Always observe standard safety precautions when you install,

operate, and maintain this product. Only qualified and authorized service

personnel should attempt to adjust, maintain, or repair it; this should never be

done by untrained or unauthorized persons.

TRADEMARKS USED IN THIS MANUAL

BLACK BOX and the logo are registered trademarks of Black Box

Corporation.

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

trademark owners.

19.2-KBPS RS-232 LONG-HAUL MODEM (LHM-19.2)

EUROPEAN UNION DECLARATION OF CONFORMITY

The manufacturer declares that the LHM-19.2 conforms to the following EMC and

safety standards:

• EN55022 (1994): “Limits and methods of measurement of radio disturbance

characteristics of information technology equipment.”

• EN50082-1 (1992): “Electromagnetic compatibility: Generic immunity

standard for residential, commercial, and light industry.”

• EN60950 (1992/3): “Safety of information technology equipment, including

electrical business equipment.”

The LHM-19.2 herewith complies with the requirements of the EMC Directive

89/336/EEC and the Low Voltage Directive 73/23/EEC. The product was tested

in a typical configuration.

Also, in accordance with EN41003, we declare the safety status of the ports on

the LHM-19.2: The port labeled “DTE” has SELV (Safety Extra Low Voltage)

status, and the ports (terminals) labeled “XMT” have TNV (Telecommunication

Network Voltage) status within SELV limits.

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.

19.2-KBPS RS-232 LONG-HAUL MODEM (LHM-19.2)

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.

TABLE OF CONTENTS

Contents

Chapter Page

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

2. Introduction ............................................................................................... 9

2.1 Overview .............................................................................................. 9

2.2 Functions ........................................................................................... 11

3. Configuration ........................................................................................... 14

4. Installation ................................................................................................ 18

4.1 Rackmounting (Optional) ............................................................... 18

4.1.1 Rackmounting a Single LHM-19.2 ........................................ 19

4.1.2 Rackmounting Two LHM-19.2s Side by Side ........................ 20

4.2 Connecting Data Cables ................................................................... 22

4.3 Connecting Power ............................................................................. 24

5. Operation ................................................................................................. 25

5.1 Power-Up ........................................................................................... 25

5.2 The LHM-19.2’s Front-Panel Indicators and Controls ................... 25

5.3 Power-Down ....................................................................................... 27

5.4 Reconfiguration ................................................................................ 27

6. Troubleshooting ...................................................................................... 28

6.1 Tests and Diagnostics ........................................................................ 28

6.1.1 PATT Button: Bit Error Rate Test (BERT) ........................... 28

6.1.2 ANA Button: Local Analog Loopback ................................... 30

6.1.3 REM Button: Remote Digital Loopback ............................... 31

6.1.4 DIG Button: Local Digital Loopback .................................... 33

6.2 Calling Black Box .............................................................................. 34

6.3 Shipping and Packaging ................................................................... 34

Appendix: RS-232 Pinout ............................................................................... 35

19.2-KBPS RS-232 LONG-HAUL MODEM (LHM-19.2)

1. Specifications

Compliance — EMI/RFI: CE (EN55022, EN50082-1), FCC Part 15

Subpart J Class A, IC Class/classe A;

Electrical safety: CE (EN60950, EN41003)

Cable Required — Between ME380A units: 4-wire twisted pair, 19 to

26 AWG;

Between ME380A and DTE: EIA/TIA RS-232 cable with

DB25 male connector on ME380A end

Interface — To line: 4-wire telco style (do not connect to PSTN);

To device: Serial EIA/TIA RS-232/CCITT V.24, DCE

Protocol — To line: Synchronous;

To device: Synchronous or asynchronous (user-

selectable); for line transmission, async data is

converted to sync using ITU V.14 compliant methods

Clock Source — Either internal, external from local device, or recovered

from remote LHM-19.2 (user-selectable)

Data Format — User-selectable for any word length from 8 to 11 bits,

including 5, 6, 7, or 8 data bits; even, odd, or no parity;

and 1, 1.5, or 2 stop bits; see Table 3-1 in Chapter 3

Data Rate — 1.2, 2.4, 4.8, 9.6, or 19.2 kbps (user-selectable)

Transmit Level — 0, –3, –6, –9, or –12 dBm (user-selectable)

Transmit

Impedance — 600 ohms or “LOW” (user-selectable)

Receive

Impedance — 600 ohms or “HIGH” (user-selectable)

Return Loss — Greater than 15 dB

Carrier — Controlled by RTS or constantly ON (user-selectable)

CTS Signal — ON only when modems are synchronized

Encoding — 16-state, 8-dimensional Trellis coding

Modulation — QAM with error correction

CHAPTER 1: Specifications

Equalization — Adaptive

Synchronization

Delay — Startup: Up to 8 seconds;

Resync: Up to 5 seconds

Line Type — 4-wire, at least voice-grade

Maximum

Transmission

Distance — Unloaded lines: Up to 37.2 miles (60 km)—see Table 1-1;

Conditioned lines: Up to 62 miles (100 km), depending

on line quality

Table 1-1. Maximum transmission distance.

Wire Gauge Up to 9600 bps At 19.2 kbps

19 AWG 37.2 mi. (60 km) 28 mi. (45 km)

22 AWG 21.1 mi. (34 km) 16.1 mi. (26 km)

24 AWG 15.5 mi. (25 km) 11.8 mi. (19 km)

26 AWG 12.1 mi. (19.5 km) 9 mi. (14.5 km)

User Controls — (4) Front-mounted pushbuttons:

DIG (local digital loopback),

ANA (local analog loopback),

REM (remote digital loopback), and

PATT (bit error rate test);

(10) Internal:

(1) Dial for data rate;

(1) Four-position DIP switch for protocol, async word

length, and stop-bit shortening;

(8) Jumpers:

Transmit clock source;

Carrier control;

Transmit level;

Transmit-line impedance;

Receive-line impedance;

Enable/disable analog-loopback command on

Pin 18;

Pin 21 signal (RL for remote digital loopback or

SQD for signal quality);

Connect/disconnect signal ground and chassis

ground

19.2-KBPS RS-232 LONG-HAUL MODEM (LHM-19.2)

Diagnostics — Continuous line-quality testing (results indicated with

SQ LED and optionally with SQD signal);

V.52 compliant bit error rate testing with pseudo-random

bit patterns (results indicated with SQ LED and

optionally with SQD signal);

V.54-compliant loopback tests:

Local analog loopback, mechanically or electrically

user-controllable;

Local digital loopback, mechanically user-controllable;

Remote digital loopback, mechanically or electrically

user-controllable

Indicators — (7) Front-mounted LEDs: PWR (power), RTS, TD, RD,

DCD, TEST, and SQ; also indicates line quality and

BERT results with SQD signal on Pin 21 if that function

is enabled

Connectors — (2) Rear-mounted:

(1) DB25 for cable to DTE;

(1) 5-position terminal block for 4-wire modem-to-

modem line, including optional ground for cable

shield

Temperature

Tolerance — 32 to 158˚F (0 to 70˚C)

Humidity

Tolerance — Up to 90% noncondensing

Enclosure — High-impact plastic

Protection — AC/DC overvoltage-protection circuits connected

through transformers to transmit and receive lines

Fuse — 250 V, 250 mA slow-blow

Power — Directly from outlet through detachable 5-ft. (1.5-m) line

cord and rear-mounted IEC 320 male inlet:

Input: 115 VAC, 47 to 63 Hz, up to 250 mA;

Consumption: 5 watts typical

Size — 1.6"H x 9.6"W x 7.6"D (4.1 x 24.4 x 19.3 cm)

Weight — 3.1 lb. (1.4 kg)

CHAPTER 2: Introduction

2. Introduction

2.1 Overview

The 19.2-kbps RS-232 Long-Haul Modem (LHM-19.2) is a medium-range, 4-wire

voice-band modem operating at data rates up to 19,200 bps. It is optimized for

metropolitan applications where the distance is too long for short-range modems,

but insufficient to justify the expense of long-range modems.

The LHM-19.2 operates in full duplex. You can attach pairs of LHM-19.2s to

conditioned or unconditioned 4-wire leased or private lines. They will be able to

communicate at selectable data rates up to 19,200 bps, as far as 41 miles (65 km)

over unconditioned lines (depending on the data rate and line quality), or as far as

62 miles (100 km) over conditioned lines (depending on the line quality only).

The LHM-19.2 uses an adaptive equalizer and 16-state 8-dimensional Trellis-

coded modulation to achieve as close to error-free communication as possible. The

LHM-19.2’s transmit level is selectable in 3-dBm increments, over the range of 0 to

–12 dBm. The modems are coupled to the attached 4-wire line through isolation

transformers which, together with other circuitry, protect against AC or DC

overvoltages.

Communication between LHM-19.2 pairs over the 4-wire link is always

synchronous. Each LHM-19.2 can derive the transmit clock internally, externally

(from the attached DTE), or by recovering it from the signal received from the

other modem. (Receive clock is regenerated from the data.) Communication with

the attached DTE can be either synchronous or asynchronous; when it’s

asynchronous, the LHM-19.2 performs V.14-compliant async-to-sync conversion.

For diagnostics, the LHM-19.2 performs continuous line tests. It indicates line

quality with the SQ LED and (optionally) the RS-232 SQD signal: The LED stays ON

and the signal stays high if quality is good, but if the bit error rate ever rises above

1x10

-3, the LED and signal flicker for intermittent errors or dim or even go

dead

for continuous errors. The LHM-19.2 can also perform V.54 testing, including

local

analog loopback and local and remote digital loopback. These tests can be controlled

with the LHM-19.2’s front-panel pushbuttons or by toggling the RS-232 LL and RL

signals on Pins 18 and 21 of its DTE interface. Finally, the LHM-19.2 supports an

internal pseudo-random V.52 Bit Error Rate Test pattern; it shows results with the

SQ LED and SQD signal the same way it does for the line-quality tests.

On the next page, Figure 2-1 shows a standard dual-modem application, and

Figure 2-2 shows a tail-circuit application using four modems.

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