Black Box LMX Series User manual

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INFORMATION

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APRIL 1999

38888

LMX Series

(Asynchronous 4-Port Multiplexor)

TRADEMARKS

TRADEMARKS USED IN THIS MANUAL

UL is a registered trademark of Underwriters Laboratories Incorporated.

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

the trademark owners.

LMX SERIES (ASYNCHRONOUS 4-PORT 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 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.

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.

LMX SERIES (ASYNCHRONOUS 4-PORT 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.

CONTENTS

Contents

Chapter Page

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

2. Introduction ............................................................................................................8

2.1 Overview ..........................................................................................................8

2.2 Features............................................................................................................8

2.3 What’s Included ..............................................................................................8

2.4 Performance ....................................................................................................9

3. Installation ..............................................................................................................10

4. Port Interface..........................................................................................................11

LMX SERIES (ASYNCHRONOUS 4-PORT MULTIPLEXOR)

1. Specifications

Multiplexing Technique — Bit-interleaved, time division, asynchronous, full

duplex

Sub-Channel Characteristics

Number of Sub-Channels — Up to four

Data Rate — Up to 64 Kbps

Codes — Unrestricted and protocol-transparent

Transmission Delay — Less than 0.02 msec.

Interface — EIA/TIA-561, Modular, RJ-45 (Std.);

EIA/TIA RS-232-C/CCITT V.24 Adapter (Optional)

Composite Link Characteristics (LMX Interface, Dual Fiber)

Line Interface — Dual optical cable, ST connectors

Transmission Mode — Full duplex

Transmission Range — 1.9 miles (3.1 km)

Composite Data Rate — 1.25 Mbps

Optical Output Level — -23 dBm into 50/125 fiber;

-16 dBm into 100/140 fiber

CHAPTER 1: Specifications

General Specifications

Compliance — FCC Part 15, Class A; Wallmount power supply: UL®,

CSA

LED Indicators — Power, Sync, Composite Data

Power Requirements — 115 VAC ±10%, 60 Hz @ 0.2 Amp maximum (Std.);

230 VAC ±10%, 50 Hz @ 0.2 Amp maximum

(Optional)

Operating Temperature — 50 to 120°F (10 to 49°C)

Storage Temperature — -40 to +149°F (-40 to +65°C)

Max. Altitude Tolerance — Operating: 20,000 ft. (6096 m); Storage: 40,000 ft.

(12,192 m)

Size — 1.7"H x 7"W x 3.3"D (4.3 x 17.8 x 8.4 cm)

Weight — 2.5 lb. (1.1 kg)

LMX SERIES (ASYNCHRONOUS 4-PORT MULTIPLEXOR)

2. Introduction

2.1 Overview

This LMX Series Multiplexor is an efficient, low-cost, bit-interleaved, four-port,

asynchronous Time Division Multiplexor (TDM), complete with an integral four-

wire limited-distance line driver. The LMX allows for interconnection of up to four

local clustered terminals operating at asynchronous data rates up to 64 Kbps.

The LMX Series Multiplexor is an ideal low-cost alternative to more expensive

statistical multiplexors and leased-line modems. Ideal applications are in a

building, in a campus setting, or in a factory environment using fiber optic cable.

2.2 Features

• TDM with integral limited distance fiber modem.

• Up to 4 async sub-channels.

• Sub-channel data rates up to 64 Kbps.

• Speed and protocol transparent.

• Range up to 3 km on fiber.

• Plug-in installation, no option switches to set.

2.3 What’s Included

Here’s what you should have received:

(1) LMX Series Asynchronous 4-Port Multiplexor with fiber interface

(1) External transformer

(1) User’s manual

CHAPTER 2: Introduction

2.4 Performance

Synchronization between units is maintained continuously with no operator

control required. A “SYNC ERROR” indicator, located on the front of the unit, will

turn on, alerting you if loss of sync occurs.

In operation, the LMX automatically adapts port speeds to the rates of the

individual terminals. No clock source is required.

The multiplexor’s unique method of maintaining synchronization minimizes the

number of overhead bits from the data stream. All ports operate at maximum

throughput levels with virtually no multiplexing delay. As DTE speeds vary, high-

speed data sampling on each port allows the unit to follow any changes, so the unit

is transparent to error control, EIA propagation, or flow control.

This multiplexor has the fiber drivers installed. The unit uses a dual fiber

connection for two fiber optic cables. Its effective range is 1.9 miles (3.1 km).

Figure 2-1. Typical Application.

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