StorageWorks DWZZH Manuale utente

DWZZH 16–Bit SCSI Bus Hub

User’s Guide

EK–DWZZH–UG. B01

Digital Equipment Corporation

Maynard, Massachusetts

Second Edition, April 1998

While DIGITAL believes the information included in this publication is correct as of

the date of publication, it is subject to change without notice.

Any changes or modifications made to this equipment may void the user's authority to

operate this equipment.

This equipment generates, uses, and can radiate radio frequency energy and, if not

installed and used in accordance with the instructions, may cause harmful interference

to radio communications. However, there is no guarantee that interference will not

occur in a particular installation. If this equipment does cause harmful interference to

radio or television reception, which can be determined by turning the equipment off and

on, the user is encouraged to try to correct the interference by one or more of the

following measures:

Reorient or relocate the receiving antenna

Increase the separation between the equipment and receiver

Connect the equipment into an outlet on a circuit different from that to which the

receiver is connected

Consult the dealer or an experienced radio/TV technician for help

This equipment requires the use of shielded SCSI cables such as the Digital Equipment

Corporation BN37A-series.

StorageWorks and the DIGITAL logo are trademarks of Digital Equipment

Corporation.

Printed in the USA

EK–DWZZH–UG. B01 iii

Contents

Revision Record…………………………………………………………………v

About This Guide………………………………………………………….…..vii

1 Introducing the 16-Bit SCSI Hub

1.1 SCSI Bus Hub Functions........................................................................................ 1–1

1.2 Product Descriptions.............................................................................................. 1–2

1.2.1 DWZZH 3.5" SBB Hubs .................................................................................. 1–2

1.2.2 DWZZH 5.25" SBB Hubs................................................................................. 1–4

1.2.3 SCSI Bus Components ..................................................................................... 1–5

1.3 Product Specifications............................................................................................ 1–6

2 Using a 16-Bit SCSI Hub

2.1 Large Hub Fair Arbitration..................................................................................... 2–1

2.2 Large Hub Addressing Configurations.................................................................... 2–2

2.3 Front Panel............................................................................................................. 2–4

2.3.1 Fair ARB Disable............................................................................................. 2–4

2.3.2 Indicators......................................................................................................... 2–5

2.3.3 Narrow Addressing Setting............................................................................... 2–5

2.4 Determining the Configuration............................................................................... 2–6

2.5 Selecting the SCSI Cables...................................................................................... 2–6

Glossary

Figures

1–1 DWZZH–21 or DWZZH-03 SCSI Bus Hub............................................................ 1–2

1–2 DWZZH–21 Front Panel ........................................................................................ 1–3

1–3 DWZZH–03 Front Panel ........................................................................................ 1–3

1–4 DWZZH–05 SCSI Bus Hub.................................................................................... 1–4

2–1 DWZZH–05 SCSI ID Assignments ........................................................................ 2–3

2–2 DWZZH Front Panel.............................................................................................. 2–4

2–3 DWZZH–05 SCSI Narrow ID Assignments............................................................ 2–5

2–4 DWZZH–05 SCSI Narrow Addressing Jumper....................................................... 2–6

Tables

1–1 SCSI Bus Hub Functional Specifications................................................................ 1–5

EK–DWZZH–UG. B01 v

Revision Record

The Revision Record provides a concise publication history of this guide. It lists the guide

revision levels and release dates, and summarizes the changes.

The following revision history lists all revisions of this publication and their effective

dates. The publication part number is included in the Revision Level column, with the

last entry denoting the latest revision. This publication supports the DWZZH 16-Bit

SCSI Bus Hub.

Revision Level Date Summary of Changes

EK–DWZZH–UG. A01 October 1997 Original Release.

EK–DWZZH–UG. B01 April 1998 Change title page;

Add Section 1.2.2 describing

DWZZH–05 hub;

Change Chapter 2 title from

“Installing” to “Using” and add

procedures for configuring a SCSI bus

using a DWZZH hub.

EK–DWZZH–UG. B01 vii

About This Guide

This chapter tells you what this User’s Guide does, identifies the audience, describes the

structure and contents (chapter-by-chapter) briefly, and tells you how to get support and

services from DIGITAL.

This User’s Guide describes the purpose, function, operation, and use of the DWZZH

16-Bit SCSI Bus Hub (the DWZZH Hub or the Hub). The DWZZH Hub allows the

connection of up to five ports on one logical SCSI bus.

Visit our Web Site for the Latest Information

Check our web site for the latest drivers, technical tips, and documentation. We

can be found in the technical area of our web page:

http://www.storage.digital.com/

Audience

This guide is intended for end users and for DIGITAL employees responsible for

configuring, installing, and maintaining the StorageWorks subsystem and its

components.

Related Documentation

You should be familiar with the information contained in the following

documentation:

Document Title Order Number

StorageWorks Solutions Configuration Guide EK–BA350–CG

StorageWorks Solutions Shelf and SBB User’s Guide EK–BA350–UG

StorageWorks SBB Shelf I/O Modules EK–SBBIO–UG

StorageWorks UltraSCSI Configuration Guidelines EK–ULTRA–CG

StorageWorks Solutions BA356–SB 16-bit Shelf User’s Guide EK–BA356–UG

DWZZH 16–Bit SCSI Bus Hub

viii EK–DWZZH–UG. B01

Document Structure

This guide contains the following chapters:

Chapter 1. Introducing the DWZZH Hub

This chapter gives brief functional and physical descriptions of the DWZZH Hub

and lists significant product specifications.

Chapter 2. Using the DWZZH Hub

This chapter gives the procedures for configuring a StorageWorks SCSI bus

using a DWZZH Hub.

Glossary

The Glossary defines terms that are used frequently with StorageWorks and SCSI

bus components.

Support and Services

Who to contact in the Americas

Information and Product Questions: Local Sales Office / StorageWorks Hotline

1-800-786-7967

Installation Support: Contact the DIGITAL Distributor where the

Storage Solution was Purchased / Local

DIGITAL Sales Office.

DIGITAL Multivendor Customer Service (MCS)

Installation Contact the DIGITAL Customer Support

Center (CSC).

Warranty Contact the DIGITAL Customer Support

Center (CSC) for warranty service after

solution is installed and operating.

Remedial Contact the DIGITAL Customer Support

Center (CSC)

Note: A Service Contract is recommended

when the equipment is out of warranty.

Contact the local DIGITAL Sales Office.

Customer Support Center (CSC) 1 800-354-9000

About This Guide

EK–DWZZH–UG. B01 ix

Who to contact in Europe

Information and Product Questions, Contact the DIGITAL Distributor or reseller

Installation Support, and Installation: from whom the Storage Solution was

purchased.

For Warranty Service See the Warranty Card packaged with the

product.

For Remedial Service Contact the DIGITAL Distributor or reseller

from whom the Storage Solution was

purchased.

Note: A Service Contract is recommended

when the equipment is out of warranty.

Who to contact in Asia Pacific

For all services, contact the DIGITAL Distributor or reseller from whom the

equipment was purchased.

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