Black Box SCSI Switch II Manuale utente
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746
© Copyright 1996. Black Box Corporation. All rights reserved.
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DECEMBER 1996
SW845A-R2
SW845AE-R2
SCSI Switch II
SCSI Switch II
Power Port B Port C
Port A
2
SCSI SWITCH II
TRADEMARKS USED IN THIS MANUAL
UL is a registered trademark of Underwriters Laboratories Incorporated.
All applied-for and registered trademarks are the property of their respective
owners.
3
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 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.
4
SCSI SWITCH II
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.
5
NOM STATEMENT
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.
6
SCSI SWITCH II
Contents
Chapter Page
1. Specifications ............................................................................................. 7
2. Introduction ............................................................................................... 8
2.1 The Complete Package ....................................................................... 8
2.2 Description .......................................................................................... 9
2.3 Caring for the Switch ........................................................................ 10
3. Installation ................................................................................................ 11
3.1 Preinstallation Guidelines ................................................................ 11
3.2 Installing the Switch .......................................................................... 11
4. Operation ................................................................................................. 12
5. Troubleshooting ...................................................................................... 13
5.1 Common Problems ........................................................................... 13
5.2 Contacting Your Supplier ................................................................. 15
5.3 Shipping and Packaging ................................................................... 15
6. Technical Details ..................................................................................... 16
6.1 Bus Length ........................................................................................ 16
6.2 Termination ...................................................................................... 16
6.3 Termination Exceptions ................................................................... 17
7
CHAPTER 1: Specifications
1. Specifications
Compliance — UL®, CSA, FCC Part A, CE
Protocol — Synchronous and asynchronous
Standards — SCSI-1, SCSI-2, and SCSI-3
Interface — Single-ended
Termination — All branches must be terminated externally
SCSI ID — None
User Controls — (3) Pushbuttons for branch selection (Port A, B, or
C)
Indicators — (1) Power, (3) Branch-connected LEDs
Connectors — (1) P5 2.1-mm female power jack, (4) high-density
68-pin SCSI-3
Enclosure — ABS plastic
Operating
Temperature — 32 to 158˚F (0 to 70°C)
Storage
Temperature — –4 to +212˚F (-20 to +100˚C)
Humidity — 10 to 95%, noncondensing
Maximum Altitude
Tolerance — 15,000 feet (4570 m)
Power — SW845A-R2: 120 VAC wallmount, 9 VDC @ 500 mA;
SW845AE-R2: 100–260 VAC wallmount, 9 VDC @
500 mA
Size — 2.3"H x 8.1"W x 4.3"D (5.8 x 20.6 x 10.9 cm)
Weight — 1.4 lb. (0.6 kg)
8
SCSI SWITCH II
2. Introduction
The SCSI Switch II is a SCSI-bus-sharing switch that connects multiple
combinations of host and target devices to each other. In situations in which
more than one user want to share a SCSI device, the SCSI Switch II eliminates
the hazards associated with “hot-swapping” bus cables: Instead of users
shutting down a system to plug and unplug cables, the SCSI Switch II switches
the SCSI bus between them cleanly and safely. The Switch’s built-in logic
monitors bus activity and ensures that data transfer will not be interrupted. Its
compact size allows the SCSI Switch II to be set up for many different
configurations.
2.1 The Complete Package
You should have received these items with your SCSI Switch II:
• The SCSI Switch II itself,
• The Switch’s AC power supply, and
• This manual.
If you didn’t receive everything, contact your supplier immediately.
The basic SCSI Switch II is ready to install and use in almost any SCSI
system with a “single-ended” interface. (The Switch does not support the
“differential” interface.) The SCSI adapter cables are necessary to connect the
Switch to standard SCSI-1 or SCSI-2 equipment on with telco connectors or
high-density 50-pin connectors on the branch buses.
9
CHAPTER 2: Introduction
2.2 Description
With the SCSI Switch II, you can switch between one “main” SCSI bus and
three “branches.” Both the main bus and the branch buses may have any
combination of SCSI initiators (host computers) and targets (disk drives,
scanners, tape drives, etc). There is no difference between the main bus and
the three branches except for the way they are routed through the Switch:
Figure 2-1. Routing of Main Bus and Thre Branch Buses.
The SCSI Switch II supports the common “single-ended” SCSI interface.
The main-bus connector on the back of the SCSI Switch II (labeled INPUT)
is a female high-density 68-pin receptacle. There are three branch-bus
connectors (labeled A, B, and C). Each one is a high-density 68-pin
connector.
Main
Bus
Branch
Buses
A
B
C
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