Black Box Time-Division Multiplexor User manual

OCTOBER 1999

MX560A

Time-Division Multiplexor

PWR

Time Division Multiplexor

SYNC

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]

TIME-DIVISION MULTIPLEXOR

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 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.

TIME-DIVISION MULTIPLEXOR

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.

TIME-DIVISION MULTIPLEXOR

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.

TIME-DIVISION MULTIPLEXOR

TRADEMARKS

UL®is a registered trademark of Underwriters Laboratories Incorporated.

The trademarks mentioned in this manual are the sole property of their owners.

TIME-DIVISION MULTIPLEXOR

Contents

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

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

3. Setup and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2 Character Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3 Stop-Bit Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4 Channel 1 Sync/Async . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.5 Equipment Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.6 Factory Straps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.7 Board Layout and Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

TIME-DIVISION MULTIPLEXOR

1. Specifications

Applications—RS-232 sync or async 2 sub-channel multiplexor

Capacity—(2) sync or (1) sync and (1) async RS-232 terminals, (1) sync RS-232

modem

Data Format—Data coding: synchronous or asynchronous

Data Rates—Async 600 bps to 19.2 kbps or sync up to 19.2 kbps with 38.4 kbps

composite

Data Interface—EIA RS-232C

Connectors—(3) DB25 female

Enclosure—Aluminum

Approvals—FCC Class A, UL®, CSA

Operating Temperature—32 to 122°F (0 to 50°C)

Relative Humidity—Up to 90% noncondensing

Altitude—Up to 10,000 feet (3048 m)

Power Requirements—110- or 220-VAC, 47-63 Hz, 5 W external wallmount

transformer

Size—2"H x 8.3"W x 6.1"D (5.1 x 21.1 x 15.5 cm)

Weight—2.25 lb. (1 kg)

TIME-DIVISION MULTIPLEXOR

2. Introduction

The Time-Division Multiplexor is a full-duplex, RS-232, 2-channel, time-division

multiplexor with an independent switch-selectable V.14/V.22-compliant

asynchronous-to-synchronous interface adapter on sub-channel 1. The composite

channel is designed to interface directly with a high-speed synchronous modem via

a straight-through cable. The unit operates by sequentially selecting a bit of data

from the sub-channel and then multiplexing it onto the composite channel. Each

sub-channel can operate at 1⁄2the composite channel rate. Standard DB25 female

connectors are provided on all sub-channels as well as the composite channel.

Power is provided by an external transformer connected through J1 (Power) on

the rear of the mutliplexor. The external power transformer is UL and CSA

approved.

Front-panel LEDs include SYNC and Power. When two TDMs are in sync with

each other and data transmission is possible, the SYNC LED should be lit. The

Power LED should be on at all times.

Three DB25 female connectors are provided for connecting the modem on the

composite port (J2) and two terminals. Channel 1 (J3) can be used for

synchronous or asynchronous operation. Channel 2 (J4) can be operated only as a

synchronous channel. Channel 1 must be used as either sync or async on both ends

of the circuit for the multiplexor to function properly.

Figure 2-1. Typical Application.

Async

Terminal

Sync

Terminal

Time-Division

Multiplexor

Time-Division

Multiplexor

Modem Modem

Host

Processor

TIME-DIVISION MULTIPLEXOR

3. Setup and Installation

3.1 Installation

Set switches to match the required configurations as described in Sections 3.2

through 3.5. The cabling between each device and the Time-Division Multiplexor

must be terminated with male connectors. Character length and stop-bit reduction

only apply to channel 1 when it is selected for asynchronous operation.

3.2 Character Length

SW1 positions 1 and 2 select the character length. The character length includes

the start, stop, and any parity bits. 10-bit length is 1 start bit, 8 data bits, and 1 stop

bit. Figure 3-1 outlines all the available character bit lengths available.

3.3 Stop-Bit Reduction

SW1 position 3 selects the percentage of stop-bit reduction to occur when the sync

rate is faster than the async rate. Setting SW1 position 3 to ON will select 25% stop-

bit reduction. Setting SW1 position 3 to OFF will select 12.5% stop-bit reduction.

3.4 Channel 1 Sync/Async

SW1 position 5 selects channel 1 as a sync or async channel. This selection must be

the same on both ends of the circuit for the units to operate correctly. Setting SW1

position 5 to ON will select asynchronous operation on channel 1. Setting SW1

position 5 to OFF will select synchronous operation on channel 1.

3.5 Equipment Grounding

SW1 position 6 connects Pin #1 (Chassis Ground) to Pin #7 (Signal Ground).

3.6 Factory Straps

SW1 position 4 is not used. It must be in the OFF position. Jumpers JP1 through

JP3 must be installed for proper operation.

TIME-DIVISION MULTIPLEXOR

3.7 Board Layout and Jumper Settings

Figure 3-1. Board Layout.

Power

Connector

JP3

JP2

JP1

Power Sync

Factory Test

Jumpers

MUST BE IN

Character

Length

ON OFF

{

25% Stop Bit Reduction = ON/12.5% Stop Bit Reduction = OFF

Factory Test, MUST BE OFF

Chan 1 Async = ON/Chan 1 Sync = OFF

Signal Ground Connected to Chassis Ground = ON

J2 J3 J4

Composite

(Modem)

Channel 1

(Terminal)

Character Length — SW1

1 2 Length

OFF OFF 10 Bits

ON OFF 11 Bits

OFF ON 8 Bits

ON ON 9 Bits

Channel 2

(Terminal)

1 2 3 4 5 6

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