Black Box ME251A-R3 Manuel utilisateur

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]

CUSTOMER

SUPPORT

INFORMATION

DECEMBER 2001

ME251A-R3

ME251AE-R3

ME251C-R3

ME253A-R2

ME253AE-R2

ME253C-R2

ME255A-R2

ME255AE-R2

ME255C-R2

Synchronous Modem

Eliminator (SME-4M)

SME-4

DSR TXD CTS

B B B

RI CON LB

CTS TXD DSR

A A A

FCC STATEMENT

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 B 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.

Synchronous Modem Eliminator (SME-4M)

INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)

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.

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.

TRADEMARK STATEMENT

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

Synchronous Modem Eliminator (SME-4M)

Contents

Chapter Page

1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

3.1 LED Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

4. Digital Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

5. Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

6. RS-232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

7. Nonstandard Transmission Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

CHAPTER 1: Specifications

1. Specifications

AC Power — 115 VAC, 60 Hz or 230 VAC, 50 Hz, 10 watts

Wallmount No load output voltage: 18 VAC nominal

Transformer Output — Voltage at rated current 16 + 0.5 VAC rated

Load Current 0.13 amps (part number PS154)

Size — Standalone Unit: 1.8"H x 5.5"W x 8.5"D (4.5 x 13.9 x 21.5 cm)

Weight — Standalone Unit: 2 lb. (0.9 kg)

Enclosure — High-impact plastic

Connectors — (2) DB25 female, mounted on rear panel

Interface — RS-232C (CCITT V.24/V.28) serial synchronous or asynchronous

Indicators — (6) LEDs: TX Data, CTS and DSR for each of the two ports

External Controls — RI button, loopback switch and DSR control

Operating Environment — 32 to 122°F (0° to 50°C), Up to 95% relative humidity, non-condensing

RM008 Rack Dimensions — 5.22"H x 19"W x 9.25"D (13.2 x 48.2 x 23.4 cm)

(For Standard Equipment Rack)

RM008 Rack Weight (with no cards installed) — 9.5 lb. (4.3 kg)

Synchronous Modem Eliminator (SME-4M)

2. Description

The SME-4M Synchronous Modem Eliminator is designed to replace two modems in point-to-point

applications. As shown below, a single SME-4M allows asynchronous, synchronous or bisynchronous

communications between two items of data terminal equipment (DTE) over EIA RS-232C cable.

In the synchronous mode, the SME-4M operates at speeds up to 38,400 bps, 56,000 bps or 64,000 bps

depending on the model. In either synchronous or asynchronous mode, the SME operates

transparently.

The small size and light weight of the SME-4M minimize logistics problems and simplifies installation

and replacement in the field. Since no special tools are required, the SME-4M unit is designed for

o-it-yourself installation.

Six indicators and three front panel switches facilitate operation and do-it-yourself troubleshooting.

The indicators (three for each item of DTE) monitor Transmitted Data, Data Set Ready and Clear To

Send signals. The front panel switches control Data Set Ready (DSR) and Ring Indicator (RING)

signals as well as select the digital loopback (DLB) test mode.

Figure 2-1. Typical Point-to-Point Application with Modems

Figure 2-2. Typical Point-to-Point Application without Modems

ASYNC OR

SYNC HOST

MODEM MODEM ASYNC OR

SYNC TERMINAL

DIALUP OR

LEASED LINE

ASYNC OR

SYNC HOST

ASYNC OR

SYNC HOST

ASYNC OR

SYNC HOST

(ECN25C)

RS-232 CABLE

(ECN25C)

RS-232 CABLE

CHAPTER 2: Description

Figure 2-3. Location of Controls, Indicators and Straps

CTS B

TXD B

DSR B

CON

DSR A

TXD A

CTS A

PWR

DSR-B

REM

LOC

50ms

10ms

0ms

CTS-B

DELAY

50ms

10ms

0ms

CTS-B

DELAY

U10

CD-B

DSR-A

REM

LOC

REM

LOC

CTS-A

CD-A

CTS-B

PORT A

PORT B

Synchronous Modem Eliminator (SME-4M)

3. Installation

Proceed as follows to install the SME-4M:

1. Remove the release screw located on the bottom center of the unit and separate the cover

from the unit.

2. Plug in the cord from the transformer to the male power connector, J3, on the card.

Do not plug the transformer into an AC outlet.

3. Using the cables supplied with your terminal’s or computer’s ports, connect them to the

25-pin connectors (J1 and J2) at the rear of the unit. (If no cables are available, use pin-for-pin

EIA RS-232C cables having at least pins 1-8, 15, 17, 20, 21, 22, and 24 wired (these are the

minimum number of pins that can be connected for the unit to function properly).

4. Select the operating mode by installing the speed selection strap (W2 in Figure 2-3) to async

or the desired synchronous speed as shown below. For more information see Chapter 7.

PART NUMBER SPEED STRAP POSITION

ME251A-R3, 1200, 2400, 4800 Shown on board

ME251AE-R3, 9600, 19,200 or

ME251C-R3 38,400 bps

ME253A-R2, 56,000 bps a

ME253AE-R2,

ME253C-R2

ME255A-R2 64,000 bps a

ME255AE-R2

ME255C-R2

5. For synchronous operation, select the clock source for both DTE devices. For external

clock to be supplied by the device connected to Port A, install the “XA” external clock strap.

For external clock to be supplied by the device connected to Port B, install the “XB”

external clock strap.

6. The following strapping will work in most configurations including IBM®System AS/400™,

System 36, and System 38:

• CTS A = SW • CTS Delay = 10 MS

• CTS B = SW • CD Delay = 10 MS

• CD A = SW • DSR A = Local

• CD B = SW • DSR B = Local

Set all front panel pushbuttons in the OUT position.

CHAPTER 3: Installation

NOTE

The IBM device parameters should be set for non-switched/leasedline.

If different settings are required, see steps 7 through 10.

7. Select the CTS control by installing both the “A” and “B” CTS constant/switched straps.

In the switched position, a CTS signal is generated when the SME-4M receives an RTS signal

(in the digital loopback test mode, the control signals always will be ON). In the constant

position, CTS and Carrier Detect (of the respective port), and Signal Quality of the other

port are always ON.

8. For switched CTS applications, select the CTS delay for Port A and B by installing the CTS

delay selection straps. Delays of 0, 10, and 50 milliseconds are available.

9. Select the DSR control by installing the “A” and “B” DSR remote/local straps. In the remote

position, the DSR signal is generated when the other port receives a DTR signal. In the local

position, DSR is always on.

10. The CD (Carrier Detect) option is controlled by setting the “A” and”B” Switched or Constant

straps. In the Switched position, a CD signal is generated when the other port receives a RTS

signal. In the Constant position, CD is always on.

NOTE

If the CTS options are set to Constant, the CD options have no effect.

11. Install the top cover.

12. Connect the communication devices to ports A and B.

13. Plug in the transformer.

14. If the local DSR control was selected by the configuration straps, the CON front panel switch

must be in the OUT position to turn DSR ON. Set the CON switch to the IN position to turn

DSR OFF.

15. If required by your application, press then release the momentary RING switch to send Ring

Indicator signal.

16. Observe the indicators for each item of DTE to monitor the status.

17. The SME-4M is now ready for operation.

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