Black Box LMX Series User manual
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SUPPORT
INFORMATION
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APRIL 1999
38888
LMX Series
(Asynchronous 4-Port Multiplexor)
1
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.
2
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.
3
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.
4
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.
5
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
6
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
7
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)
8
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
9
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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