Black Box ME375A-R2 User manual

CUSTOMER

SUPPORT

INFORMATION

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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]

MARCH 1998

ME375A-R2

ME375AE-R2

ME376A-R2

ME376AE-R2

Async/Sync 2-Wire Short Haul Modem

ASYNC/SYNC 2-WIRE SHORT HAUL MODEM

DIG ANA

PWR RTS TD RD DCD LOS ERR TEST REM PATT RESET

FCC/IC RFI STATEMENTS, SAFETY WARNING

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 classe A prescrites dans le Règlement sur le brouillage

radioélectrique publié par le ministère des Communications du Canada.

SAFETY WARNING

Always observe standard safety precautions during installation, operation, and

maintenance of this product. If you attempt to remove the power-supply fuse, be

sure to disconect the power cord from the power source first, in order to avoid the

possibility of electric shock.

ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

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 parato 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.

NOM STATEMENT

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.

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.

ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

Contents

Chapter Page

1. Specifications ............................................................................................. 7

2. Introduction ............................................................................................. 10

3. Installation ................................................................................................ 11

3.1 Placement .......................................................................................... 11

3.2 Setting the Internal Controls ........................................................... 11

3.3 Connecting the Data Cables ............................................................. 16

3.4 Connecting to AC Power .................................................................. 17

4. Operation ................................................................................................. 19

4.1 The Front-Panel Controls and Indicators ....................................... 19

4.2 Power-Up, Normal Operation, and Power-Down ........................... 22

4.3 Reconfiguration ................................................................................ 23

5. Troubleshooting ...................................................................................... 24

5.1 Diagnostic Testing ............................................................................ 24

5.2 Calling Black Box .............................................................................. 28

5.3 Shipping and Packaging ................................................................... 28

Appendix: Pinouts .......................................................................................... 29

Legal Information ........................................................................................... 33

CHAPTER 1: Specifications

1. Specifications

Compliance — FCC Part 15 Subpart J Class A, DOC Class/MDC classe A

Standard — T1: ANSI T1.601.1988

Interfaces — ME375 models: 2-wire telco, EIA RS-232;

ME376 models: 2-wire telco, ITU-TSS (CCITT) V.35

Protocols — DTE side: Synchronous or asynchronous;

Line side: 2B1Q encoding

Clock Source — Internal, external (from DTE), or received (from other

unit), user-selectable

Data Format — 7 or 8 data bits; 1 or 2 stop bits; even, odd, or no parity

(user-selectable)

Operation — Line side: Full duplex with echo cancellation

Data Rate — 128, 115.2, 64, 57.6, 48, 38.4, 19.2, 9.6, 4.8, 2.4, 1.2, and

0.6 Kbps

Transmission

Level — Up to 14 dBm

Maximum

Distance — DTE side:

ME375 models: 50 ft. (15.2 m);

ME376 models: 25 ft. (7.6 m);

Line side: 3.4 mi. (5.5 km) over 26-AWG wire,

independent of data rate

ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

User Controls — (5) Front-mounted:

(4) Pushbuttons: DIG (local digital loopback), ANA

(local analog loopback), REM (remote digital

loopback), and PATT (test pattern);

(1) Recessed RESET switch;

(6) Internal:

(1) 7-position DIP switch for protocol, data format,

and signaling options;

(1) Rotary switch for data rate;

(4) Jumpers for clock source, loopback testing, and

ground connection

Diagnostics — V.54-compliant loopback tests:

Local analog loopback (switch- or signal-triggerable);

Local digital loopback (switch-triggerable);

Remote digital loopback (switch- or signal-triggerable)

Indicators — (8) Front-mounted LEDs: PWR (power), RTS, TD, RD,

DCD, LOS (loss of signal), ERR (error), and TEST

Connectors — ME375 models: (1) RJ-45 female, (1) 3-clip terminal

block, and (1) DB25 female;

ME376 models: (1) RJ-45 female, (1) 3-clip terminal

block, and (1) 34-pin M-block female

Leads/Signals

Supported — See the Appendix

Power — From internal power supply through included or

alternate 5-ft. (1.5-m) power cord:

ME375A-R2, ME376A-R2:

Input: 103.5 to 131.5 VAC, 47 to 63 Hz;

ME375AE-R2, ME376AE-R2:

Input: 207 to 253 VAC, 47 to 63 Hz;

Consumption: 5 VA

CHAPTER 1: Specifications

Fuse — ME375A-R2, ME376A-R2: 0.1-A slow-blow;

ME375AE-R2, ME376AE-R2: 0.2-A slow-blow

Other Power

Protection — AC/DC overvoltage-protection circuits connected

through transformers to transmit and receive leads on

the line side, plus special gas diodes

MTBF — 75,500 hours

Maximum

Altitude — 8000 ft. (2438.4 m)

Temperature

Tolerance — 32 to 122˚ F (0 to 50˚ C)

Humidity

Tolerance — Up to 90% noncondensing

Enclosure — High-impact plastic

Size — 1.8"H x 7.6"W x 9.6"D (4.6 x 19.3 x 24.3 cm), but the

unit’s pushbuttons protrude up to 0.1" (25 mm) from

the front panel and the connectors protrude up to 0.8"

(1.9 cm) from the rear panel

Weight — Net: 3.1 lb. (1.4 kg);

Shipping: 6 lb. (2.7 kg)

ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

2. Introduction

The Async/Sync 2-Wire Short Haul Modem (A/S2W SHM) operates synchronously

or asynchronously at high speeds (600 bps to 128 Kbps) and in full duplex over

one pair of dedicated telephone lines. It has a range of 3.4 miles (5.5 km) over

26-AWG wire.

The A/S2W SHM operates in full duplex over 2 wires by using the adaptive

“echo-canceling” technique. Because it also uses 2B1Q line coding, it can achieve

the range mentioned above no matter what the data rate is.

The A/S2W SHM incorporates interface circuits for the terminal/computer, an

adaptive echo-canceler, an automatic adaptive equalizer, a modulator, and a

demodulator. It is coupled to the telephone line through an isolation transformer,

which protects against AC or DC overvoltages. The protection circuitry would

enable the unit to operate even if DC were accidentally connected to the line.

The A/S2W SHM has diagnostic capabilities: It can perform local analog

loopback and local and remote digital loopback. The operator at either end of the

line may test both modems and the line in the remote digital loopback mode.

Loopback can be controlled with either the unit’s front-panel pushbuttons or

signals passed through the DTE (PC, data-terminal) interface.

CHAPTER 3: Installation

3. Installation

This chapter tells you how to configure and install the Async/Sync 2-Wire Short

Haul Modem. After you finish doing this, refer to Chapter 4 for operating

information.

3.1 Placement

The Async/Sync 2-Wire Short Haul Modem is designed to be placed on a tabletop,

shelf, or bench, and is delivered completely assembled. (No provisions are made

for bolting the A/S2W SHM to any surface.)

The A/S2W SHM should be installed within 1.5 m (5 ft) of a grounded AC

outlet and must be situated within 25 ft. (7.6 m—ME376 models) or 50 ft. (15 m—

ME375 models) of the associated data terminal.

Allow at least 36" (90 cm) of clearance in front of the unit so you can access it

during operation and maintenance. Make sure that there is at least 4" (10 cm) of

clearance behind the unit for signal lines and interface cables.

3.2 Setting the Internal Controls

Before you install any cabling and definitely before you plug in the unit, you

should set the Async/Sync 2-Wire Short Haul Modem’s internal controls to suit

your application. (If you don’t feel comfortable about doing this yourself, get an

experienced technician to do it or to help you.) To access the internal controls,

first make sure the A/S2W SHM is disconnected from AC power, then unscrew the

two screws on the unit’s rear panel and slide the bottom half of the unit out from

beneath its cover.

Refer to Figure 3-1 on the next page and Table 3-1 on the succeeding pages for

the locations of the controls and their possible settings respectively.

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