Black Box SCSI Switch II User manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746

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DECEMBER 1996

SW845A-R2

SW845AE-R2

SCSI Switch II

Power Port B Port C

Port A

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.

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.

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.

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.

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

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

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)

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.

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

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