Black Box LT0007A-2U User manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1997. Black Box Corporation. All rights reserved.

MARCH 1997
LT0007A-2U LT0007A-4U
LT0007A-2SU LT0007A-4SU
Smart Lobe Access Unit
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 [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]

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SMART LOBE ACCESS UNIT
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 classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.

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SMART LOBE ACCESS UNIT
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.

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SMART LOBE ACCESS UNIT
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.

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SMART LOBE ACCESS UNIT
TRADEMARKS USED IN THIS MANUAL
IBM is a registered trademark of International
Business Machines Corporation.
Any other trademarks mentioned in this manual are
acknowledged to be the property of the trademark owners.

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SMART LOBE ACCESS UNIT
DECLARATION OF CONFORMITY
The products listed in this manual conform to the following standard(s) or
other normative document(s):
EMC: EN 55022 (1994): Limits and methods of measurement of radio
disturbance characteristics of information technology equipment.
EN 50082-1 (1992): Electromagnetic compatibility—Generic
immunity standard for residential, commercial, and light
industry.
Supplementary Information: The products herewith comply with the
requirements of the EMC Directive 89/336/EEC. The products were tested
in a typical configuration.

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SMART LOBE ACCESS UNIT
1. Specifications
Unit Characteristics:
Input Voltage — 11 to 35 VDC (12 VDC
typical)
Input Current — 100 mA @ 12 VDC
(2-Port units); 140 mA @
12 VDC (4-Port units)
Operating Current — 140 mA @ 5 VDC (2-Port
units); 240 mA @ 5 VDC
(4-Port units)
Phantom Circuit:
Operating Voltage — 4.5 ±0.7 volts
Operating Current — 1.0 mA @ 5 VDC
Resistance TX to RX — 4.8 ±0.2 kΩ
Insertion Time — 5 milliseconds (typical)
Removal Time — 5 milliseconds (typical)

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SMART LOBE ACCESS UNIT
Insertion Loss (Maximum) —
0.5–4 MHz 4–16 MHz 16–32 MHz
SUB TX to SUB RX 0.65 dB 1.3 dB 2.6 dB
MAIN RX to SUB RX 0.85 dB 1.8 dB 3.7 dB
SUB TX to MAIN TX 0.85 dB 1.8 dB 3.7 dB
Crosstalk (Maximum) —
10 KHz 0.5–4 MHz 4–16 MHz
SUB TX to SUB RX 55 dB 43 dB 37 dB
SUB WRAP to MAIN 50 dB 40 dB 35 dB
Pinout Signal —
IBM Cabling System RJ-45
RCV Red Pin 4
Green Pin 5
XMT Orange Pin 6
Black Pin 3
SHIELD Pins 7 & 8
POWER FEED
+V Pin 1
-V Pin 2
Radiation
Suppression — Complies with FCC Par
15, subpart B, class A;
EN55022 class A

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SMART LOBE ACCESS UNIT
Jumper — 4- or 16-Mbps rate
selection (4M/16M)
Electrical Connectors — For UTP: MAIN and
lobes: RJ-45 jack; For
Screened UTP: MAIN and
lobes: Shielded RJ-45
jack
Indicators — (3) or (5) Red LEDs,
depending on which
unit you have
Operating
Temperature — 32 to 122°F (0 to 50°C)
Relative Humidity
Tolerance — 10 to 90%,
noncondensing
Size — 1.5"H x 4.5"W x 7.3"D
(3.8 x 11.4 x 18.5 cm)
Weight — 12 oz. (340 g)

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SMART LOBE ACCESS UNIT
2. Introduction
2.1 Description
The Smart Lobe Access Unit allows connection of
two or four token-ring workstations to a single lobe.
Token-ring-network flexibility is increased by
enabling users to expand the topology in a more
cost-effective way. Cabling needs and installation
costs are reduced by allowing workstations to be
added to the ring without the need for additional
lobe cables to the central hub.
Wire-fault detection, which senses any short, open,
or illegal impedance in the main lobe connection, is
incorporated. If a fault is detected, the Smart Lobe
Access Unit deinserts all connected workstations.
The Smart Lobe Access Unit is powered from an
external DC power adapter via modular power jack,
or via the MAIN connector. In the latter case, 6-wire
cabling is required.
There are four models—two- and four-port versions
for either ordinary UTP cabling or “screened” UTP
cabling. “Screened” UTP has some shielding, but has
the same electrical characteristics as regular UTP

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SMART LOBE ACCESS UNIT
cabling. To get Screened UTP cabling from Black
Box, ask for Product Code SVNSL60 (stranded) or
EVNSL71 (solid, plenum-rated).
2.2 The 2-Port Smart Lobe Access Unit
The 2-Port Smart Lobe Access Unit has three ports,
each using RJ-45 connectors for UTP or RJ-45
shielded connectors for screened UTP. Their
functions are explained in the table below.
Table 2-1. 2-Port Smart Lobe Access Unit Functions
Port Name Type Function
MAIN (UTP) RJ-45 Connection of unit to lobe.
(Screened UTP) RJ-45 Shielded
SUB-1 (UTP) RJ-45 Connection of workstation #1 to
(Screened UTP) RJ-45 Shielded unit.
SUB-2 (UTP) RJ-45 Connection of workstation #2 to
(Screened UTP) RJ-45 Shielded unit.

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SMART LOBE ACCESS UNIT
2.3 The 4-Port Smart Lobe Access Unit
The 4-Port Smart Lobe Access Unit has five ports,
each using RJ-45 connectors for UTP or RJ-45
shielded connectors for screened UTP. Their
functions are explained in the table below.
Table 2-2. 4-Port Smart Lobe Access Unit Functions
Port Name Type Function
MAIN (UTP) RJ-45 Connection of unit to lobe.
(Screened UTP) RJ-45 Shielded
SUB-1 (UTP) RJ-45 Connection of workstation #1 to
(Screened UTP) RJ-45 Shielded unit.
SUB-2 (UTP) RJ-45 Connection of workstation #2 to
(Screened UTP) RJ-45 Shielded unit.
SUB-3 (UTP) RJ-45 Connection of workstation #3 to
(Screened UTP) RJ-45 Shielded unit.
SUB-4 (UTP) RJ-45 Connection of workstation #4 to
(Screened UTP) RJ-45 Shielded unit.

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SMART LOBE ACCESS UNIT
2.4 Applications
The Smart Lobe Access Unit’s primary application is
to double or quadruple a single lobe’s capacity.
Using the Smart Lobe Access Unit reduces cabling
costs. If there is a wire fault, the entire lobe access
unit is removed from the main ring. A typical
application using Smart Lobe Access Units is
described in the illustration below.
Figure 2-1. Typical Application of the Smart Lobe Access Unit.
MAU
(two channel)
Smart Lobe Access
Unit (2-Port)
Smart Lobe Access
Unit (4-Port)

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SMART LOBE ACCESS UNIT
A single 2-Port Smart Access Lobe enables
connection of two workstations to a lobe or a single
4-Port Smart Access Lobe enables connection of four
workstations to a lobe. A typical application is shown
in the illustration on the next page. The main lobe
cable (L) running from the distribution panel
located at the wiring closet to the faceplate located at
the workstation’s area is low-cost unshielded IBM®
Type 3 cable or screened UTP cable. All patching
cables (P) are IBM Type 3 cable or screen UTP
cable. NOTE
The maximum lengths stated below are the “general
rule.” These lengths may be exceeded in rings where
the topology allows.

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SMART LOBE ACCESS UNIT
Figure 2-2. Recommended Maximum
Cable Lengths (16 Mbps).
Smart Lobe Access
Unit (2-Port)
P(max) + L(max) ≤90 m with IBM
Type 3, (Level IV and V)
and screened UTP cables
MAU Distribution Panel
Faceplate
L
P
P

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SMART LOBE ACCESS UNIT
3. Installation
3.1 Site Preparation
Figure 3-1. Smart Lobe Access Unit Application.
Smart Lobe Access
Unit (4-Port)
MAU
Workstation
Patch Point #2Main Cable
23
1
4
Patch Point #1

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SMART LOBE ACCESS UNIT
UTP ( USING RJ-45 CONNECTORS )
Use a standard four-position (two twisted pairs) UTP
or screened UTP cables for all connections.
Figure 3-2. Cable Wiring.
R EMOTE
P OWER F EEDING
The illustration below shows an example using 8-wire
UTP cabling.
Figure 3-3. 8-Wire UTP Application.
+
_
3
4
5
6
6
5
4
3
Orange
Green
Red
Black
MAU/RJ-45 Lobe MAU/RJ-45 Lobe
8-wire UTP
Patch Point #1
4-wire UTP
Pin 2
Patch Point #2
MAU
Smart Lobe Access
Unit (4-Port)
Power Supply

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SMART LOBE ACCESS UNIT
Connect pin 1 of the eight-wire UTP cable to the
positive terminal and pin 2 of the eight-wire UTP
cable to the negative terminal of the power supply.
3.2 Set-Up Procedures
The Smart Lobe Access Unit has a rate-selection
jumper, set to either 4 or 16 Mbps, that can be
accessed by opening the unit box. The CPU refers
to this selection after power-up. The factory-default
setup is 16 Mbps.
Connect the unit to an external 11–35 VDC adapter
(typically a 12-VDC, 300-mA adapter).
Remote feeding can be used as a primary or backup
power source when using 8-wire UTP (see Figure
3-3).
3.3 Electrical Installation
Connect the Smart Lobe Access Unit to an external
11–35 VDC power source. Connect the cable
between the unit’s MAIN connector and the MAU.
Connect the cable between the unit’s SUB connector
and the workstation’s token-ring adapter card port.