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Document:	StorageWorks Solutions BA353-Ax Desktop Expansion Unit U. G.
Order Number:	EK-BA353-UG
Revision:	C01
Pages:	50
Original Filename:

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StorageWorks™ Solutions
BA353–Ax Desktop Expansion Unit
User’s Guide
Order Number: EK–BA353–UG. C01

Part I of this manual describes the BA353–Ax StorageWorks desktop
expansion unit product line features, configurations, operations, and
installation.
Part II describes the procedures to be performed by trained personnel
to exchange 5¼-inch, half-height devices, and 3½-inch StorageWorks
building blocks (SBBs).

Digital Equipment Corporation
Maynard, Massachusetts

April 1994
While Digital believes the information included in this publication is correct as of the date of
publication, it is subject to change without notice.
Digital Equipment Corporation makes no representations that the interconnection of its products
in the manner described in this document will not infringe existing or future patent rights, nor
do the descriptions contained in this document imply the granting of licenses to make, use, or sell
equipment or software in accordance with the description.
© Digital Equipment Corporation 1992, 1993, 1994.
Printed in the United States of America.
All rights reserved.
NOTE: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications.
Any changes or modifications made to this equipment may void the user’s authority to operate this
equipment.
Operation of this equipment in a residential area may cause interference in which case the user
at his own expense will be required to take whatever measures may be required to correct the
interference.
HSC, StorageWorks, and the DIGITAL logo are trademarks of Digital Equipment Corporation.
The postpaid READER’S COMMENTS card requests the user’s critical evaluation to assist in
preparing future documentation.

This document was prepared using VAX DOCUMENT Version 2.1.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manufacturer’s Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vii

Part I Desktop Expansion Unit User’s Guide
1 Desktop Expansion Unit Overview
1.1
1.2
1.3
1.4
1.5

Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Device Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2
1–3
1–3
1–4
1–7

2 Desktop Expansion Unit Operations
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3

Enclosure Power and Cooling Status Display . . . . . . . . . . . . . . . . . . . . . .
SBB and Device Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The SCSI Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Terminating SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ30–VE 5¼-Inch Cartridge Tape Drive . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–2
2–4
2–4
2–4
2–6

3 Desktop Expansion Unit Installation
3.1
3.2
3.3
3.4

Desktop Expansion Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a 3½-Inch SBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a 3½-Inch SBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a 5¼-Inch, Half-Height Storage Device . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–4
3–6

Part II Desktop Expansion Unit Service Guide
4 Exchanging Devices and SBBs
A Specifications
A.1
A.2

Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Stabilization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–2
A–3

iii

Glossary
Index
Figures
1–1
1–2
1–3
1–4
1–5
1–6
1–7
2–1
2–2
2–3
2–4
2–5
3–1
3–2
3–3
4–1
4–2
4–3
4–4
4–5
4–6

BA353–Ax Desktop Expansion Unit . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Desktop Expansion Unit Installation . . . . . . . . . . . . . . . . . . .
50-Conductor Standard Cable BN21H . . . . . . . . . . . . . . . . . . . . . . . . .
50-Conductor Adapter Cable BN31B . . . . . . . . . . . . . . . . . . . . . . . . . .
50-Conductor Adapter Cable BN21R . . . . . . . . . . . . . . . . . . . . . . . . . .
50-Conductor Adapter Cable BC09D . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Desktop Expansion Unit Devices Installation . . . . . . . . . . . . .
Desktop Expansion Unit AC Power Components . . . . . . . . . . . . . . . . .
Desktop Expansion Unit—Status LED . . . . . . . . . . . . . . . . . . . . . . . .
Storage SBB Activity and Device Fault LEDs . . . . . . . . . . . . . . . . . . .
Desktop Expansion Unit SCSI Bus Components . . . . . . . . . . . . . . . . .
Typical Device Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Workstation Installation—Rear View . . . . . . . . . . . . . . . . . . .
Typical 3½-Inch SBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Device Security Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Desktop Expansion Enclosure—Bottom View . . . . . . . . . . . . . . . . . . .
Desktop Expansion Enclosure—Cover Latch . . . . . . . . . . . . . . . . . . . .
Desktop Expansion Enclosure—Cover Tabs . . . . . . . . . . . . . . . . . . . .
Backplane In 5¼-Inch Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backplane In 3½-Inch Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3½-Inch Side Rails Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–2
1–6
1–6
1–6
1–7
1–7
2–1
2–2
2–3
2–5
2–5
3–1
3–3
3–3
4–2
4–2
4–3
4–3
4–4
4–4

StorageWorks Related Documentation . . . . . . . . . . . . . . . . . . . . . . . .
Desktop Expansion Unit Configurations . . . . . . . . . . . . . . . . . . . . . . .
Desktop Expansion Unit Included Storage Device Specifications . . . .
Country-Specific Power Cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI ‘‘A’’ Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Desktop Expansion Unit Device Addresses . . . . . . . . . . . . . . . . . . . . .
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Stabilization Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .

vi
1–2
1–3
1–3
1–4
2–6
A–1
A–1
A–1
A–2
A–3

Tables
1
1–1
1–2
1–3
1–4
2–1
A–1
A–2
A–3
A–4
A–5

Preface
This manual describes the BA353–Ax StorageWorks™ expansion unit product
line features, configurations, operations, and installation. This manual also
describes the procedures to be performed by trained personnel to exchange
5¼-inch, half-height devices and 3½-inch StorageWorks building blocks (SBBs).

Intended Audience
This manual is intended for use by personnel who are responsible for operating,
maintaining, and installing the StorageWorks desktop expansion unit.

Structure
This manual is organized as follows:
Part I Desktop Expansion Unit User’s Guide
Chapter 1

Describes the desktop expansion unit features, configurations, and
cable requirements.

Chapter 2

Describes the operation and status indicators for the desktop expansion
unit.

Chapter 3

Describes the installation of the desktop expansion unit and the
removal and installation of storage device SBBs.

Part II Desktop Expansion Unit Service Guide
Chapter 4

Describes the procedures for modifying slot 3 from a 5¼-inch, halfheight (HH) storage device to accept a 3½-inch SBBs.

Appendix
Appendix A

Describes the physical, electrical, and environmental specifications, and
the procedures for stabilizing storage devices.

Documentation Conventions
The following conventions are used in this manual:
boldface type

Boldface type indicates the first instance of terms being defined in text,
in the glossary, or both.

italic type

Italic type indicates emphasis and complete manual titles. In the
glossary, italic type is also used to indicate cross-references.

Related Documents
Table 1 lists the StorageWorks related user documents organized by use, system,
or product.
Table 1 StorageWorks Related Documentation
Document Title

Order Number
StorageWorks Primary Publications†

StorageWorks Solutions Configuration Guide

EK–BA350–CG

StorageWorks Solutions Shelf and SBB User’s Guide
StorageWorks Family 3½-inch Half-Height Device Installation
Guide

EK–BA350–UG
EK–MC350–IG

RRD42 Disk Drive Owner’s Manual

EK-RRD42–OM

RRD43 CD–ROM User’s Guide

EK-RRD43–IN

RRD44 CD–ROM User’s Guide

EK-RRD44–IN

SWXTE StorageWorks 8505 8mm Cartridge Tape Subsystem User’s
Guide

EK-STWCT–UG

TZ30 Cartridge Tape Drive Operator’s Manual

EK–OTZ30–OM

TZ30 Cartridge Tape Drive Reference Card

EK–OTZ30–RC

TZ30 Cartridge Tape Drive Technical Manual

EK–OTZ30–TM

TZK11 Tape Backup System User Guide

EK–TZK11–UG

General Reference Publications
Digital Systems and Options Catalog

†

Small Computer System Interface, An Overview

EK–SCSIS–OV

Small Computer System Interface, A Developer’s Guide

EK–SCSIS–DK

† Available from your Digital account representative.

Manufacturer’s Declarations
The equipment described in this manual is listed by Underwriter Laboratories
Inc. and bears the UL listing mark. The unit is also certified by the Canadian
Standard Association and the TUEV Product Service GmbH and bears the
Canadian Certification Mark and the TUEV GS mark.
CAUTION
This is a class A product. In a domestic environment, this product may
cause radio interference, in which case the user may be required to take
adequate measures.

ACHTUNG !
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen
können bei Betrieb dieses Gerätes Rundfunkstörungen auftreten, in
welchen Fällen die Benutzer für entsprechende Gegenmaßnahmen
verantwortlich sind.

ATTENTION !
Ceci est un produit de Classe A. Dans un environment domestique, ce
produit risque de créer des interférences radiélectriques, il appartiendra
alors à l´utilisateur de prendre les mesures spécifiques appropriées.

vii

Für Bundesrepublik Deutschland
For Federal Republic of Germany
Pour la République féderale d’Allemagne
Hochfrequenzgerätezulassung und Betriebsgenehmigung
Bescheinigung des Herstellers/Importeurs:
Hiermit wird bescheinigt, daß die Einrichtung in Übereinstimmung mit
den Bestimmungen der DBP-Verfügung 523/1969, Amtsblatt 113/1969, und
Grenzwertklasse "A" der VDE0871 funkentstört ist.
Das Bundesamt für Zulassungen in der Telekommunikation der Deutschen
Bundespost (DBP) hat diesem Gerät eine FTZ-Serienprüfnummer zugeteilt.
Betriebsgenehmigung:
Hochfrequenzgeräte dürfen erst in Betrieb genommen werden, nachdem hierfür
von dem für den vorgesehenen Aufstellungsort zuständigen Fernmeldeamt mit
Funkstörungsmeßstelle die Genehmigung erteilt ist.
Als Antrag auf Erteilung einer Genehmigung dient eine Anmeldepostkarte
(Anhang des Handbuches) mit Angabe der FTZ-Serienprüfnummer.
Der untere Teil der Postkarte ist vom Betreiber zu vervollständigen und an das
örtliche Fernmeldeamt zu schicken. Der obere Teil bleibt beim Gerät.
Betreiberhinweis:
Das Gerät wurde funktechnisch sorgfältig entstört und geprüft. Die
Kennzeichnung mit der Zulassungsnummer bietet Ihnen die Gewähr, daß
dieses Gerät keine anderen Fernmeldeanlagen einschließlich Funkanlagen stört.
Sollten bei diesen Geräten ausnahmsweise trotzdem, z.B. im ungünstigsten Fall
beim Zusammenschalten mit anderen EVA-Geräten, Funkstörungen auftreten,
kann das im Einzelnen zusätzliche Funkentstörungsmaßnahmen durch den
Benutzer erfordern.
Bei Fragen hierzu wenden Sie sich bitte an die örtlich zuständige
Funkstörungsmeßstelle Ihres Fernmeldeamtes.
Externe Datenkabel:
Sollte ein Austausch der von Digital spezifizierten Datenkabel nötig werden,
muß der Betreiber für eine einwandfreie Funkentstörung sicherstellen, daß
Austauschkabel im Aufbau und Abschirmqualität dem Digital Originalkabel
entsprechen.
Kennzeichnung:
Die Geräte werden bereits in der Fertigung mit der Zulassungsnummer
gekennzeichnet und mit einer Anmeldepostkarte versehen. Sollte Kennzeichnung
und Anmeldepostkarte übergangsweise nicht mit ausgeliefert werden,
kontaktieren Sie bitte das nächstgelegene Digital Equipment Kundendienstbüro.

viii

Part I
Desktop Expansion Unit User’s Guide
Part I introduces the BA353–Ax StorageWorks desktop expansion unit and
describes how to configure, operate, and install the unit.

1
Desktop Expansion Unit Overview
This chapter describes the StorageWorks BA353–Ax desktop expansion unit
configurations, Small Computer System Interface (SCSI) and power cable
requirements, and storage device varients.
The StorageWorks BA353–Ax desktop expansion unit (shown in Figure 1–1)
is a low-profile, SCSI-based unit with self-contained power and cooling. It can
accommodate either two 3½-inch StorageWorks building blocks (SBBs) and
one 5¼-inch, half-height storage device1 , or three 3½-inch SBBs.
Figure 1–1 BA353–Ax Desktop Expansion Unit

CXO-3679A_PH

The footprint of the desktop expansion unit is no larger than a typical central
processing unit (CPU). It can support up to 45 kg (99 lb) and can be placed either
on top of or under the CPU with the monitor on top. The preferred configuration
is in the horizontal position on top of the CPU and under the monitor, as shown
in Figure 1–2. An advantage of using this configuration is that you can see the
status of the SBB light emitting diodes (LEDs) and the desktop expansion unit
LED.

The 5¼-inch storage device is not mounted in an SBB.

Desktop Expansion Unit Overview 1–1

Figure 1–2 Typical Desktop Expansion Unit Installation

DESKTOP
EXPANSION
UNIT

CXO-3692A-PH

1.1 Configurations
All desktop expansion units include the following:
•

A universal ac input power supply2

•

A cooling fan

The standard desktop expansion unit configurations, shown in Table 1–1, do
not include any 3½-inch SBBs. These optional storage devices are ordered
separately.
Table 1–1 Desktop Expansion Unit Configurations
Model No.

Included Storage Devices

BA353–AA

N/A

BA353–AD

RRD44–VE CD–ROM

BA353–AE

RRD43–VE CD–ROM

BA353–AF

RRD42–VE CD–ROM

BA353–AH

TZ30–VE cartridge tape drive

BA353–AJ

TZK11–VE cartridge tape drive

BA353–AP

SWXTE–AC cartridge tape drive

Requires a country-specific ac power cord.

1–2 Desktop Expansion Unit Overview

Table 1–2 lists the specifications for the devices included as varients for use with
the desktop expansion unit. For additional information concerning other storage
devices, SCSI cables, and compatible systems, refer to the following manuals:
•

StorageWorks Solution Configuration Guide

•

StorageWorks Solution Shelf and SBB User’s Guide

•

Digital Systems and Options Catalog

Table 1–2 Desktop Expansion Unit Included Storage Device Specifications
Device Type

Capacity

Transfer Rate

Maximum SCSI
Transfer Rate

RRD42–VE CD–ROM

600 MB

150 KB/s

5 MB

RRD43–VE CD–ROM

600 MB

150/300 KB/s

5 MB

RRD44–VE CD–ROM

600 MB

150/330 KB/s

5 MB

SWXTE–AC cartridge tape drive

10 GB

1 MB

5 MB

TZ30–VE cartridge tape drive

95 MB

62.5 KB/s

5 MB

TZK11–VE cartridge tape drive

62.5 GB

300 KB/s

3 MB

1.2 Configuration Rules
There are no unique configuration rules for the desktop expansion unit. Refer to
the StorageWorks Solutions Configuration Guide for the general StorageWorks
configuration rules.

1.3 Power Cord Requirements
Power cords must be ordered separately. The internal power supply, located at
the left rear corner of the desktop expansion unit, is a universal ac input supply
that can operate on input power of 100-120 V ac or 220-240 V ac auto ranging,
43 to 63 Hz. Country-specific input ac power cords are listed in Table 1–3. For a
complete description of the country-specific power cord requirements, refer to the
StorageWorks Solutions Configuration Guide.
Table 1–3 Country-Specific Power Cords
Country

Voltage

Plug

Length

Order No.

Australia

250 V ac

AS 3112 - 1981

2.5 m (8.2 ft)

BN19H–2E

Central Europe

250 V ac

CEE 7/7 (Schuko)

2.5 m (8.2 ft)

BN19W–2E

Denmark

250 V ac

Afsnit 107

2.5 m (8.2 ft)

BN19K–2E

Europe—Central

250 V ac

CEE 7/7 (Schuko)

2.5 m (8.2 ft)

BN19W–2E

India

250 V ac

BS 546

2.5 m (8.2 ft)

BN19S–2E

Ireland

250 V ac

BS 1363

2.5 m (8.2 ft)

BN19A–2E

Israel

250 V ac

SI 32

2.5 m (8.2 ft)

BN18L–2E

Italy

250 V ac

CEI 213–16/VII

2.5 m (8.2 ft)

BN19M–2E

Japan

125 V ac

NEMA 5–15

3.0 m (9.8 ft)

BN27S–03†

† This power cord is rated at 15 amps.

(continued on next page)

Desktop Expansion Unit Overview 1–3

Table 1–3 (Cont.) Country-Specific Power Cords
Country

Voltage

Plug

Length

Order No.

New Zealand

250 V ac

AS 3112 - 1981

2.5 m (8.2 ft)

BN19H–2E

South Africa

250 V ac

BS 546

2.5 m (8.2 ft)

BN19S–2E

Switzerland

250 V ac

SEV 1011

2.5 m (8.2 ft)

BN19E–2E

United Kingdom

250 V ac

BS 1363

2.5 m (8.2 ft)

BN19A–2E

United States

125 V ac

NEMA 5–15

3.0 m (9.8 ft)

BN27S–03 †

† This power cord is rated at 15 amps.

1.4 SCSI Cable Requirements
SCSI cables must be ordered separately. The desktop expansion unit has two
50-pin, high-density, female, SCSI connectors located at the rear of the enclosure.
The desktop expansion unit requires a cable with a 50-pin, high-density, male
connector. The host or controller SCSI connector determines the other cable
connector type.
To select the correct SCSI cables for a desktop system, complete the following
steps:
1. Identify the host computer system.
2. Identify the host computer SCSI adapter.
3. Determine the maximum SCSI bus length based upon bus speed (that is,
either fast [10 MB/s] or slow [5 MB/s]).
4. Determine the total SCSI bus length for all the desktop expansion units.
5. Determine the maximum SCSI cable length.
6. Select the SCSI cables. See Table 1–4 for the cable lengths and the order
numbers. The SCSI cable connectors are shown in Figures 1–3 through 1–6.
Table 1–4 SCSI ‘‘A’’ Cable Specifications
Cable Description

Length

Cable Order
No.

Standard cable, 50-conductor
Two 50-pin, high-density, male, straight connectors

0.3 m (1.0 ft)
0.5 m (1.6 ft)
1.0 m (3.3 ft)
1.5 m (4.8 ft)
2.0 m (6.5 ft)
3.0 m (9.8 ft)
5.0 m(16.4 ft)
10.0 m (32.8 ft)
15.0 m (49.2 ft)
20.0 m (65.6 ft)

BN21H–0C
BN21H–0E
BN21H–01
BN21H–1E
BN21H–02
BN21H–03
BN21H–05
BN21H–10
BN21H–15
BN21H–20

(continued on next page)

1–4 Desktop Expansion Unit Overview

Table 1–4 (Cont.) SCSI ‘‘A’’ Cable Specifications
Cable Description

Length

Cable Order
No.

HSC™ controller to StorageWorks shelf cable, 50conductor
One 50-pin, high-density, male, straight connector
with thumb latches
One 50-pin, high-density, male, straight connector
with thumb screws

2.0 m (6.5 ft)

BN31B–02

3.0 m (9.8 ft)

BN31B–03

Adapter cable, 50-conductor
One 50-pin, high-density, male, straight connector
One 50-pin, low-density, male, right-angle connector

2.0 m (6.5 ft)
3.0 m (9.8 ft)
5.0 m (16.4 ft)

BN21R–02
BN21R–03
BN21R–05

Adapter cable, 50-conductor
One 50-pin, high-density, male, straight connector
One 50-pin, low-density, male, straight connector

0.9 m (3.0 ft)
1.8 m (6.0 ft)
3.7 m (12.0 ft)

BC09D–03
BC09D–06
BC09D–12

The StorageWorks Solutions Configuration Guide describes the SCSI cables
and also lists the cables required to connect specific hosts and controllers to
StorageWorks products.
You can connect two or more desktop expansion units in series provided the
following conditions are met:
NOTE
The internal bus is 0.9 meters (3.0 feet) long. When selecting cables or
determining maximum bus operating speed, this demension must be
included in your computations

•

The total length of a SCSI bus transferring data at 10 MB/s is a maximum of
3.0 m (9.8 ft).

•

The total length of a SCSI bus transferring data at 5 MB/s is a maximum of
6.0 m (19.7 ft).

•

There are seven or fewer devices on the bus.

•

No two devices on the SCSI bus have the same SCSI ID.

Desktop Expansion Unit Overview 1–5

Figure 1–3 50-Conductor Standard Cable BN21H

StorageWorks
CONNECTOR
CXO-4165A-MC

Figure 1–4 50-Conductor Adapter Cable BN31B

StorageWorks
CONNECTOR
CXO-4170A-MC

Figure 1–5 50-Conductor Adapter Cable BN21R

StorageWorks
CONNECTOR
CXO-4166A-MC

1–6 Desktop Expansion Unit Overview

Figure 1–6 50-Conductor Adapter Cable BC09D

StorageWorks
CONNECTOR
CXO-4167A-MC

1.5 Storage Device Requirements
Any StorageWorks 3½-inch SBB or 5¼-inch, half-height storage device can be
installed in the desktop expansion unit. The SBBs can be installed in any slot.
As shown in Figure 1–7, the last slot on the right (slot 3) can accommodate either
a 3½-inch SBB or a 5¼-inch, half-height storage device. Trained personnel (for
example, Digital Multivendor Customer Services representatives) can convert this
slot to use a different form factor device.
Figure 1–7 Typical Desktop Expansion Unit Devices Installation

SLOT 3
SLOT 2
SLOT 1

STATUS
LED

CXO-3695A-PH

Desktop Expansion Unit Overview 1–7

2
Desktop Expansion Unit Operations
This chapter describes the basic StorageWorks desktop expansion unit operations.
•

Section 2.1 describes the desktop expansion unit ac power requirements, dc
power supply, and cooling.

•

Section 2.2 describes the desktop expansion unit status indicators.

•

Section 2.3 describes the desktop expansion unit’s Small Computer System
Interface (SCSI) bus, device addressing, and SCSI bus termination.

2.1 Enclosure Power and Cooling Status Display
The internal power supply, located at the left rear corner of the desktop expansion
unit, is a universal ac input supply that can operate on either 50 Hz or 60 Hz. It
provides +5 V dc and +12 V dc for storage device operation.
The +12 V dc also powers the internal blower that cools the desktop expansion
unit with a front to rear air flow at a rate of three cubic feet per minute per slot.
The ac power switch, as shown in Figure 2–1, controls the ac input to the dc
power supply. The ac voltage to the ac output connector is independent of
this switch. Digital recommends that the ac input power be switch controlled,
preferably by the associated workstation or personal computer (PC).
Figure 2–1 Desktop Expansion Unit AC Power Components

AC OUT

AC IN

AC POWER
SWITCH
CXO-3683B-PH

Desktop Expansion Unit Operations

2–1

The desktop expansion unit status light emitting diode (LED), mounted between
the leftmost StorageWorks building blocks (SBBs) (slots 1 and 2) (see Figure 2–2),
is on when the system blower is operating and both the +5 V dc and +12 V dc
power supply outputs are present. When any of these conditions are not met, the
desktop expansion unit status LED is off and power is removed from the SBBs
and devices.
There are no diagnostics for the desktop expansion unit; it is basically a ‘‘Go’’ or
‘‘No Go’’ unit. Neither the power supply or the fan within the desktop expansion
unit are field replaceable units (FRUs). Should either of these devices fail, contact
Digital Multivendor Customer Services.
Figure 2–2 Desktop Expansion Unit—Status LED

SLOT 3
SLOT 2
SLOT 1

STATUS
LED

CXO-3695A-PH

2.2 SBB and Device Status Indicators
The storage device status is displayed on the fronts of the 5¼-inch, half-height
storage device and 3½-inch SBBs. The status display for each of the 5¼-inch,
half-height storage devices is device specific and is described in the specific
device’s user’s guide.
Each 3½-inch SBB has two LEDs that indicate the SCSI device activity and the
SCSI device status. As shown in Figure 2–3, each 3½-inch SBB has a device
activity LED (green) and a device fault LED (amber) that display the disk drive
status. These two LEDs have three states: on, off, and flashing.
NOTE
Other devices, such as the TLZ06–VA tape drive, have device-specific
displays. See the device’s user’s guide for a description of these status
displays.

2–2 Desktop Expansion Unit Operations

Figure 2–3 Storage SBB Activity and Device Fault LEDs

DEVICE
ACTIVITY
(GREEN)

DEVICE
FAULT
(AMBER)

CXO-3671A-PH

Device status can be determined by the activity and device fault LEDs as follows:
•

When the green device activity LED is on or flashing, the device is active.
This LED is controlled by the device.
CAUTION
Removing a storage device while data is being transferred (the green LED
is on or flashing) can corrupt or lose the data.

•

When the amber device fault LED is on steadily, an error condition exists.

•

When the amber device fault LED is flashing, one of the following conditions
may exist:
–

The device is spinning up.

–

The device is spinning down.

–

The controller is checking the device address.
NOTE

Not all SCSI controllers can control the device fault LED. Check the
controller documentation to determine if this function is available.

When a fault occurs, the controller reports the fault type and the SBB device
address (SCSI target ID) to the host.

Desktop Expansion Unit Operations

2–3

2.3 The SCSI Bus
The desktop expansion unit provides add-on storage for systems supporting
SCSI devices. The capabilities of the system SCSI bus controller determine the
following:
•

The SCSI bus transfer rate (either 5 MB/s or 10 MB/s) and therefore, the
maximum SCSI bus length

•

The valid SCSI device addresses (target IDs)

•

The operation of SBB status LEDs

•

The valid SBB replacement methods—hot-swap, warm-swap, or cold-swap
(See Section 3.3 for more information on these methods.)

2.3.1 Terminating SCSI Buses
The desktop expansion unit uses a single-ended SCSI–2 bus. Bus termination
is supplied by an internal, active terminator. There is no requirement for any
other termination either on the bus or on the devices. The internal SCSI bus is
0.9 meters (3.0 feet) long. When selecting cables or determining maximum bus
operating speed, this dimension must be included in your computations.
All SCSI buses are terminated at both ends to provide reliable operation. The
last desktop expansion unit on the bus always terminates the bus.
Connecting a second desktop expansion unit to the output SCSI connector
automatically disables the termination in the first unit. Connecting a third unit
automatically disables the termination in the second unit. This feature ensures
that there is never more than one termination on the SCSI bus.
The combination of input and output SCSI bus connectors, plus individual SCSI
device address switches, enables you to quickly configure the bus to meet your
system needs.
Note
SCSI buses are terminated only at the controller and within the desktop
expansion unit. The SCSI bus is always terminated by the last desktop
expansion unit on the bus. External termination of the SCSI bus is not
required.

2.3.2 Device Addressing
You can assign a unique device address of 0 through 7 to each device on the SCSI
bus. Use the three device address switches on the rear of the unit, as shown in
Figure 2–4, to assign an unused SCSI device address to each storage device.
Note
Some system SCSI controllers have a preset SCSI device address, usually
6 or 7. A SCSI bus cannot operate when two devices have the same
address. Check the SCSI controller documentation to determine the
controller SCSI address.

2–4 Desktop Expansion Unit Operations

Figure 2–4 Desktop Expansion Unit SCSI Bus Components

SCSI OUT

DEVICE
ADDRESS
SWITCHES

SCSI IN

CXO-3928A-PH

Figure 2–5 shows a typical device address switch. Use Table 2–1 to set the device
address switch positions.
Figure 2–5 Typical Device Address Switch

CXO-3804-MC

The function of each of the three address switches is as follows:
•

The top switch (left) sets the slot 1 device address.

•

The middle switch (center) sets the slot 2 device address.

•

The bottom switch (right) sets the slot 3 device address.

Desktop Expansion Unit Operations

2–5

Table 2–1 Desktop Expansion Unit Device Addresses
Switch
Address

Off

2.3.3 TZ30–VE 5¼-Inch Cartridge Tape Drive
The TZ30–VE cartridge tape drive does not support remote device addressing.
Only the local TZ30–VE device address switches (accessible through a hole on the
right side of the unit) are used to set the device address.
NOTE
Refer to the TZ30 Cartridge Tape Technical Manual for a complete
description of the TZ30 switches.

Use the following procedure to set the device address:
Note
Switch 1 (the top switch) has no SCSI ID function and does not need to be
set.
Switches 2, 3, and 4 (the bottom three switches) set the device address.
Switch 4 is the least significant bit (LSB) and switch 2 is the most
significant bit (MSB).

1. Set the switch to the right (rear) to 0.
2. Set the switch to the left (front) to 1.
The desktop expansion unit slot 3 (right) device address switch is not used for the
TZ30–VE but may be set to the TZ30–VE address for convenience.

2–6 Desktop Expansion Unit Operations

3
Desktop Expansion Unit Installation
This chapter describes the preferred desktop expansion unit installation and the
procedures for installing, removing, and exchanging 5¼-inch, half-height storage
devices, and 3½-inch StorageWorks building blocks (SBBs).

3.1 Desktop Expansion Unit Installation
Typically, the desktop expansion unit is installed on top of the CPU with the
monitor mounted on top. This configuration allows you to view all the status
LEDs on the CPU and desktop expansion unit.
The following procedures explain how to cable a preferred system installation as
shown in Figure 3–1.
Figure 3–1 Typical Workstation Installation—Rear View

CXO-3694A_PH

Connect the ac power cord as follows:
1. Connect the desktop expansion unit ac power cord to the workstation ac
output connector and then to the desktop expansion unit ac input connector.

Desktop Expansion Unit Installation

3–1

2. Connect the monitor ac power cord to the desktop expansion unit ac output
connector and then to the monitor ac input connector if required.
Connect the SCSI cable as follows:
1. Connect the 50-pin, high-density cable connector to the SCSI INPUT
connector on the rear of the desktop expansion unit. Connect the other end
of the cable to the host or controller SCSI connector. Refer to Section 1.4 for
information on selecting a SCSI cable.
2. If additional desktop expansion units are connected, connect a 50-pin, highdensity SCSI cable from the SCSI OUTPUT connector of the first desktop
expansion to the SCSI INPUT connector on the rear of the second desktop
expansion unit. Refer to Section 1.4 for information on configuring two or
more desktop expansion units.
Using this configuration permits you to sequentially apply power to the
workstation, and then to the desktop expansion unit and monitor.

3.2 Installing a 3½-Inch SBB
A 3½-inch SBB, as shown in Figure 3–2, is the same as the 3½-inch SBBs used
with other StorageWorks products. The 3½-inch SBB is mounted horizontally
with the status LEDs to the left. This has no effect on the operation of the
storage device.
Note
Slots 1 and 2 are always used for 3½-inch SBBs. Slot 3 can be used
for either a 5¼-inch, half-height storage device or a 3½-inch SBB. See
Chapter 4 for the backplane connector positioning procedure.

Security screws are provided with each desktop expansion unit. They can be
installed through the bottom of the expansion unit into the storage devices
in each slot, as shown in Figure 3–3. These screws are used to prevent
unauthorized access and removal of devices. Although these screws would
not deter a determined person from opening the desktop expansion unit, the
person would need the proper tools to access the bottom of the unit. Security
screws can be inserted for all three slots.

3–2 Desktop Expansion Unit Installation

Figure 3–2 Typical 3½-Inch SBB

CXO-3614A-PH

Figure 3–3 Storage Device Security Screws
SLOT 1

SLOT 2

SLOT 3

FRONT

SLOT 1

SLOT 2

SLOT 3
CXO-3849A-MC

Desktop Expansion Unit Installation

3–3

Note
The SBB connector is a 96-pin female connector that provides positive
mating with the SBB shelf male connector. The connector design ensures
that dc power is present until after the SCSI bus connection is broken and
that dc power is applied before the SCSI bus connection is made. This
feature protects the integrity of the SCSI data bus and avoids introducing
noise on the bus that could either distort data or cause the bus to ‘‘hang.’’
The SBB connector is a simple, highly reliable mechanism that can
support 200 SBB replacement cycles. (Removing and replacing an SBB
constitutes one replacement cycle.) Over the projected StorageWorks
active product life of 5 years, this equates to 40 replacement cycles per
year, or approximately 1 cycle every 9 days. Excessive replacement cycles
wear away the gold contact coating and thus destroys the integrity of
the connection. The replacement cycle limit applies equally to shelf
connectors and device connectors.
Environments requiring a greater number of replacement cycles are not
supported and are considered as improper treatment or use (paragraph
9.4b of U.S. Standard Terms and Conditions). Products or connectors
damaged because of a higher number of replacement cycles are not
eligible for return under warranty and standard service plans.
Digital Equipment Corporation markets a distinct family of removable
storage elements for higher replacement cycle environments. Contact
your Digital Account Representative for more information.

3.3 Replacing a 3½-Inch SBB
There are three methods for replacing 3½-inch SBBs in desktop expansion units:
hot swap, warm swap, and cold-swap.
•

For single desktop expansion units:
–

The cold-swap method is normally used during initial installation or when
power is removed from the desktop expansion unit. None of the storage
devices are operational until the power is restored.

–

If the SCSI controller supports the hot-swap method, you can replace a
storage device using this method provided that the storage device is not
active (that is, the green device activity LED is off).
CAUTION

Do not use the hot-swap method unless you are positive that this method
is fully supported by the SCSI controller.

•

For multiple desktop expansion units:
The warm-swap method is used when two or more desktop expansion units
are connected in series. Power can be removed from one unit without
disrupting the SCSI bus.

3–4 Desktop Expansion Unit Installation

The replacement methods are defined as follows:
•

Hot-swap—A method of device replacement whereby the complete system
remains on line and active during device removal or insertion. The device
being removed or inserted is the only device that cannot perform operations
during this process. User applications that are not dependent upon the device
being swapped are not impacted.

•

Warm-swap—A method of device replacement used when there are multiple
expansion units, whereby the complete system remains on line during device
removal or insertion. Activity may be suspended or paused for a brief period
of time during device insertion or removal. No booting or loading of code is
permitted except on the device being inserted. User applications that are
not dependent upon the devices on the affected SCSI bus are not noticeably
impacted.

•

Cold-swap—A method of device replacement that requires that power be
removed from one or more shelves or expansion units thereby affecting other
devices therein. User applications that are not dependent upon the devices
being swapped are impacted as a result. This method is used when conditions
preclude the use of a warm-swap or hot-swap method. Normally, this method
is only used when installing or upgrading a StorageWorks subsystem.

Refer to the StorageWorks Solutions Shelf and SBB User’s Guide for a detailed
description of the procedures for exchanging (swapping) devices.
Use the following procedure to remove or replace a 3½-inch SBB:
CAUTION
The 3½-inch SBB is heavy and can be damaged if dropped. Therefore,
always use both hands to fully support the 3½-inch SBB during removal
or installation.

1. Optional—Remove the two security screws from the enclosure. Refer to
Figure 3–3.
2. Press the two SBB mounting tabs in to release the 3½-inch SBB.
CAUTION
To prevent electrostatic discharge (ESD) damage to a 3½-inch SBB, do not
touch the SBB interface connector.

3. Support the 3½-inch SBB with both hands as you pull it from the desktop
expansion unit.
4. Insert the replacement 3½-inch SBB into the guide slots and push it in until
it is fully seated and the mounting tabs engage the desktop expansion unit.
5. Optional—Install the two security screws.

Desktop Expansion Unit Installation

3–5

CAUTION
To prevent overheating, the following conditions must be met:
•

Slots 1 and 2 must have either a 3½-inch SBB or a blank bezel
(BA35X–Px) installed.

•

Slot 3 must have either a 5¼-inch, half-height storage device or be
configured for a 3½-inch SBB and have either a 3½-inch SBB or a
blank bezel (BA35X–Px) installed.

6. After power is applied, observe the status LEDs and verify that the green
device activity LED is either on, flashing, or off, and that the amber device
fault LED is off.
Note
The green device activity LED remains on when the SCSI cable is
disconnected.

3.4 Replacing a 5¼-Inch, Half-Height Storage Device
The status displays for 5¼-inch, half-height storage devices are storage device
specific. See the specific storage device documentation to determine if the storage
device may be replaced using the hot-swap method or whether you must use the
cold-swap method.
Use the following procedure to replace a 5¼-inch, half-height storage device in
slot 3:
CAUTION
The storage device is heavy and can be damaged if dropped. Therefore,
always use both hands to fully support the storage device during removal
or installation.

1. Optional—Remove the two security screws from the enclosure. Refer to
Figure 3–3.
2. Slide out the mounting handle, using the tabs to expose the hand grip.
3. Firmly grasp the hand grip and pull it out to release the storage device.
CAUTION
To prevent electrostatic discharge (ESD) damage to a storage device, do
not touch the SCSI interface connector.

4. Use both hands and pull the storage device out of the desktop expansion unit.
5. Insert the replacement storage device into the guide slots and push it in.
6. Push the hand grip in until the storage device is firmly seated.
7. Push in on the mounting handle tabs.

3–6 Desktop Expansion Unit Installation

8. Optional—Install the two security screws.
CAUTION
To prevent overheating, the following conditions must be met:
•

Slots 1 and 2 must have either a 3½-inch SBB or a blank bezel
(BA35X–Px) installed.

•

Slot 3 must have either a 5¼-inch, half-height storage device, or
be configured for a 3½-inch SBB and have either a 3½-inch SBB
or a blank bezel (BA35X–Px) installed.

9. After power is applied, observe the storage device status LEDs and verify that
the device is functioning properly.

Desktop Expansion Unit Installation

3–7

Part II
Desktop Expansion Unit Service Guide
Part II describes the procedures for exchanging a 5¼-inch, half-height storage
device in slot 3 of the desktop expansion unit with a 3½-inch StorageWorks
building block (SBB).
Note
Only qualified personnel, for example Digital Multivendor Customer
Services, are authorized to complete the procedures described in this part.

4
Exchanging Devices and SBBs
This chapter describes the procedures for exchanging 3½-inch StorageWorks
building blocks (SBBs) and 5¼-inch, half-height storage devices.
Either a 3½-inch SBB or a 5¼-inch, half-height storage device can be installed
in slot 3 of the desktop expansion unit. The 3½-inch SBB and the 5¼-inch,
half-height storage device are not the same size nor do they mount in the same
manner. These differences are compensated for by the following:
•

A movable backplane connector, which compensates for the different lengths

•

3½-inch side rails, which compensate for the difference in width and serve as
SBB guide slots

Use the following procedure to convert slot 3 from a 5¼-inch, half-height storage
device to a 3½-inch SBB 1 :
CAUTION
Do not attempt the following procedure unless you have taken proper
precautions against electrostatic discharge (ESD). When you remove the
cover from any enclosure or device, wear an ESD grounding wrist strap.

1. Turn off the desktop expansion unit.
2. Disconnect the SCSI cables.
3. Disconnect the power cables.
4. If installed, remove the two security screws from slot 3, located on the bottom
of the desktop expansion unit as shown in Figure 4–1.
5. Remove the 5¼-inch, half-height storage device from slot 3.
6. Place the desktop expansion unit on a flat surface with the bottom side up.
7. To release the cover latch, insert a flat-tip screwdriver in the hole at the rear
as shown in Figure 4–2.
8. To remove the cover, use a flat-tip screwdriver to press in the three cover tabs
on the left side of expansion unit, as shown in Figure 4–3, while lifting up on
the cover. Remove the cover.

You can also refer to this procedure to convert slot 3 from a 3½-inch SBB configuration
to an 5¼-inch, half-height storage device configuration.

Exchanging Devices and SBBs

4–1

Figure 4–1 Desktop Expansion Enclosure—Bottom View
SLOT 1

SLOT 2

SLOT 3

FRONT

SLOT 1

SLOT 2

SLOT 3
CXO-3849A-MC

Figure 4–2 Desktop Expansion Enclosure—Cover Latch

SLOT 1

SLOT 2

SLOT 3

POWER
SUPPLY
FRONT

COVER
RELEASE
LATCH

FAN

CXO-3848A-MC

4–2 Exchanging Devices and SBBs

Figure 4–3 Desktop Expansion Enclosure—Cover Tabs

COVER TABS

CXO-3682A_PH

9. Note the position of the 5¼-inch backplane connector in slot 3, as shown in
Figure 4–4.
Figure 4–4 Backplane In 5¼-Inch Position

BACKPLANE
5 1/4" POSITION

CXO-3685A-PH

10. Remove the backplane connector from the rear (5¼-inch) position and move it
to the front 3½-inch position, as shown in Figure 4–5.

Exchanging Devices and SBBs

4–3

Figure 4–5 Backplane In 3½-Inch Position

BACKPLANE
3 1/2" POSITION

CXO-3686A_PH

11. Insert the 3½-inch side rails into the channels, as shown in Figure 4–6. Push
each rail downward and towards the rear of the enclosure to engage the rail
and backplane connector.
Figure 4–6 3½-Inch Side Rails Installed
3 1/2" SIDE
RAILS

CXO-3687A_PH

12. Replace the cover. Make sure that the front and rear latches and the cover
tabs are properly engaged.
13. Insert a 3½-inch SBB.
14. Optional—Install the two slot 3 security screws (refer to Figure 4–1).

4–4 Exchanging Devices and SBBs

15. Connect the power cables.
16. Connect the SCSI cables.
17. Turn on power and check that the desktop expansion unit status LED and
the SBB device activity and fault status LEDs are functioning properly.

Exchanging Devices and SBBs

4–5

A
Specifications
This appendix describes the physical, electrical, cooling, thermal stabilization,
and environmental specifications of the BA353–Ax desktop expansion unit
product line.
Table A–1 Physical Specifications
Height

Width

Depth

mm (in)

BA353–Ax desktop expansion unit

60 (2.4)

431.8 (17.0)

400 (15.7)

3½-inch SBB

121 (4.8)

51 (2)

216 (8.5)

Description

Table A–2 Electrical Specifications
Item

Specification

AC power supply
Input

100–120/220–240 V ac (auto ranging), 1.1/0.7 A, 46–63 Hz

Output

61.1 W
+5 V dc ±5%, 6.0 A
+12 V dc ±5%, 4.0 A (6 A peak)

Slot power requirements

+5 V dc ±5%, 1.0 A
+12 V dc ±5%, 1.2 A

Blower power requirements

+12 V dc ±5%, 0.2 A

Auxiliary ac output

100–120/220–240 V ac, 8.0 A, 46–63 Hz

Table A–3 Cooling
Item

Specification

System blower

Front to rear air flow, 3 CFM per slot

Specifications

A–1

A.1 Environmental Specifications
The StorageWorks product line environmental specifications listed in Table A–4
are the same as for other Digital storage devices.
Table A–4 Environmental Specifications
Condition

Specification

Optimum Operating Environment
Temperature
Rate of change
Step change

+18° to +24°C (+65° to +75°F)
3°C (5.4°F)
3°C (5.4°F)

Relative humidity

40% to 60% (noncondensing) with a step change of 10% or less
(noncondensing)

Altitude

From sea level to 2400 meters (8000 feet)

Air quality

Maximum particle count .5 micron or larger, not to exceed 500,000
particles per cubic feet of air

Inlet air volume

.009 cubic meters per second (18 cubic feet per minute)

Maximum Operating Environment (Range)
Temperature

+10° to +35°C (+50° to +95°F)
Derate 1.8°C for each 1000 meters (1.0°F for each 1000 feet) of
altitude
Maximum temperature gradient 11°C/hr (52°F/hr) ±2°C/hr
(36°F/hr)

Relative humidity

10% to 90% (noncondensing)
Maximum wet bulb temperature: 28°C (82°F)
Minimum dew point: 2°C (36°F)

Maximum Nonoperating or Storage Environment (Range)
Temperature
Nonoperating
Storage
Relative humidity
Nonoperating
Storage
Altitude

A–2 Specifications

+18° to +29°C (+65° to +85°F)
-40° to +66°C (-40° to +151°F)
10% to 90% (noncondensing)
8% to 95% in original shipping container (noncondensing);
otherwise, 50% (noncondensing)
From –300 meters (–1000 feet) to +3600 meters (+12,000 ft) MSL

A.2 Environmental Stabilization
To make sure of the proper operation of Digital storage devices, the SBB
temperature must be within 18–29°C (65–85°F). Table A–5 specifies the time
required to thermally stabilize SBBs based on the ambient shipping temperature.
CAUTION
Always stabilize storage devices in the operating environment prior to
installation or operation. Otherwise, the media or associated electronics
may be damaged when power is applied to the unit.
If condensation is visible on the outside of the storage device:
Stabilize the device and the SBB in the operating environment for 6 hours or
until the condensation is no longer visible, whichever is longer. Do not insert
the storage device into the shelf until it is fully stabilized.
If condensation is not visible on the outside of the storage device:
Thermally stabilize the device for the amount of time specified in Table A–5.
Table A–5 Thermal Stabilization Specifications
Ambient
Temperature
Range °C

Ambient
Temperature
Range °F

Minimum
Stabilization
Time

60 to 66
50 to 59
40 to 49
30 to 39
18 to 29
10 to 17
0 to 9
–10 to –1
–20 to –11
–30 to –21
–40 to –31

140 to 151
122 to 138
104 to 120
86 to 102
64 to 84
50 to 63
32 to 48
14 to 30
–4 to 12
–22 to –6
–40 to –24

3 hours
2 hours
1 hour
30 minutes
None
30 minutes
1 hour
2 hours
3 hours
4 hours
5 hours

Specifications

A–3

Glossary
ac distribution
The method of distributing ac power in a cabinet.
adapter
See SCSI signal bus converter.
ANSI
American National Standards Institute
building block shelf
See SBB.
cold-swap
A method of device replacement that requires that power be removed from one
or more shelves thereby affecting other devices therein. User applications that
are not dependent upon the devices being swapped are impacted as a result. This
method is used when conditions preclude the use of a warm-swap or hot-swap
method. Normally, this method is only used when installing or upgrading a
StorageWorks subsystem.
See also warm-swap and hot-swap.
controller
A hardware/firmware device that manages communications on behalf of host
systems over the SCSI bus to devices, such as the HSC–series, HSJ–series, and
HSZ–series controllers. Controllers typically differ by the type of interface to the
host and provide functions beyond what the devices support.
DAT
Digital Audio Tape. A method of recording data on a cartridge tape.
desktop expansion unit
A low-profile, SCSI based unit with self-contained power and cooling that
can accommodate either three 3½-inch SBBs or two 3½-inch SBBs and one,
half-height 5¼-inch storage device. This unit is used with workstations and PCs
and can be positioned either adjacent to or beneath the CPU or monitor.
differential SCSI bus
A signal’s level is determined by the potential difference between two wires.
A differential bus is more robust and less subject to electrical noise than is a
single-ended bus.

Glossary–1

digital audio tape
See DAT.
disk
A storage device supporting random access to fixed size blocks of data.
disk array controller
See controller.
DWZZA
The StorageWorks compatible SCSI bus signal converter.
See SCSI bus signal converter.
electromagnetic interference
See EMI.
electrostatic discharge
See ESD.
EMI
Electromagnetic interference. The impairment of a signal by an electromagnetic
disturbance.
ESD
Electrostatic discharge. The discharge of a potentially harmful static electric
voltage as a result of improper grounding.
FRU
Field replaceable unit
half-height
(1) In the storage industry, a device of conventional dimensions, except for height.
(2) A device that occupies only one-half of a 5¼-inch SBB. The first half-height
device is always mounted in the lower (bottom) part of the SBB. The second
device in an SBB is mounted in the upper (top) part of the SBB.
host
The primary or controlling computer or any such (in a multiple computer
network) to which storage is attached.
hot-swap
A method of device replacement whereby the complete system remains on line
and active during device removal or insertion. The device being removed or
inserted is the only device that cannot perform operations during this process.
User applications that are not dependent upon the device being swapped are not
impacted.
See also cold-swap and warm-swap.
QIC
Quarter-inch cartridge. A standard tape media.

Glossary–2

RAID
Redundant Array of Independent Disks
rank
The number of devices in a RAID set.
RFI
Radio frequency interference. The impairment of a signal by an unwanted radio
signal or radio disturbance.
SBB
StorageWorks building block. The basic building block of the StorageWorks
product line. Any device conforming to shelf mechanical and electrical standards
installed in either a 3½-inch or 5¼-inch carrier is considered to be an SBB,
whether it be a storage device, a power supply, or other device.
SBB shelf
The common name for any StorageWorks shelf that contains only power supply
and storage SBBs.
SCSI
Small Computer System Interface. This ANSI interface defines the physical
and electrical parameters of a parallel I/O bus used to connect computers and a
maximum of seven devices. The StorageWorks subsystem implementation uses
SCSI–2, for the synchronous transfer of 8-bit data at rates of up to 10 MB/s.
SCSI device
A host computer adapter, a peripheral controller, or an intelligent peripheral that
can be attached to the SCSI bus.
SCSI device ID
The bit-significant representation of the SCSI addressing referring to one of the
signal lines numbered 0 through 7. Also referred to as target ID.
SCSI–A cable
A 50-conductor (25 twisted pair) cable used for single-ended, SCSI–2 bus
connections.
SCSI–P cable
A 68-conductor (34 twisted pairs) cable used for differential bus connections.
single-ended SCSI bus
Each signal’s logic level is determined by the voltage of a single wire in relation
to ground.
Small Computer System Interface
See SCSI.
storage array
An integrated set of storage devices.

Glossary–3

StorageWorks
The Digital set of enclosure products that allows customers to design and
configure their own storage subsystem. Components include power, packaging,
and interconnections in a StorageWorks shelf. SBBs and array controllers are
integrated therein to form storage subsystems. System-level enclosures to house
the shelves and standard mounting devices for SBBs are also included.
StorageWorks building block
See SBB.
supported device
(1) A device that has been fully evaluated in an approved StorageWorks
configuration (that is, shelf, cabinet, power supply, cabling, and so forth) and is in
complete compliance with country-specific standards (for example, FCC, TUV, and
so forth) and with all Digital standards. (2) A device supported by a controller or
host operating system.
tape
A storage device supporting sequential access to variable sized data records.
tape controller
See controller.
target
A SCSI device that performs an operation requested by an initiator.
target ID
See SCSI device ID.
warm-swap
A method of device replacement whereby the complete system remains on line
during device removal or insertion. Activity may be suspended or paused for a
brief period of time during device insertion or removal. No booting or loading
of code is permitted except on the device being inserted. User applications that
are not dependent upon the devices on the affected SCSI bus are not noticeably
impacted.
See also cold-swap and hot-swap.

Glossary–4

Index
3½-inch SBB
installing, 3–2

Device addresses, 2–4
TZ30–VE Cartridge Tape Drive, 2–6
Diagnostics, 2–2

A
ac power, 2–1
input, 2–1
output, 2–1
power cords, 1–3
switch, 2–1

B
Blower, 2–2
Blower status, 2–2

C
Cables
BC09D, 1–4
BN21H, 1–4
BN21R, 1–4
BN31B, 1–4
power, 1–3
SCSI, 1–4
Certification
Canadian Standard Association, vii
TUEV Product Service GmbH, vii
Underwriter Laboratories, vii
Cold-swap, 3–5
Configuration
included devices, 1–2
power supply, 1–2
rules, 1–3
standard, 1–2
Cooling, 2–1
air flow rate, 2–1
power supply, 2–1
Cord
power, 1–3

E
Environmental specifications, A–2
Environmental stabilization, A–3

F
Field replaceable unit
See FRU
FRU, 2–2

H
Hot-swap, 3–5

I
Installation, 3–1
3½-inch SBBs, 3–2
5¼-inch, half-height devices, 3–2
ac power cords, 3–1
desktop expansion unit, 3–1
preferred configuration, 3–1
SCSI cable, 3–2
security screws, 3–2

P
Power, 2–1
blower, 2–1
+5 V dc, 2–1
+12 V dc, 2–1
Power cables, 1–3
Power supply, 2–2
Power supply status, 2–2
Product description, 1–1

Desktop expansion unit
order numbers, 1–2
status LED, 2–2

Removing 3½-inch SBBs, 3–4
procedure, 3–5
Removing 5¼-inch, half-height storage device
procedure, 3–6

Index–1

Replacing 3½-inch SBBs, 3–4
cold-swap method, 3–4
hot-swap method, 3–4
procedure, 3–5
warm-swap method, 3–4
Replacing 5¼-inch, half-height storage device
procedure, 3–6

S
SBB
side rails installation, 4–1
slot 3 device installation, 4–1
slot 3 movable backplane, 4–1
SBB replacement
cold-swap, 3–5
hot-swap, 3–5
warm-swap, 3–5
SCSI
"A" cable specifications, 1–4
adapter, 1–4
bus length, 1–4
bus speed, 1–4
bus termination, 2–4
cable length, 1–4
connectors, 1–4
device addresses, 2–4
movable backplane, 4–1
SCSI "A" cable specifications, 1–4
SCSI bus
addresses, 2–4
controller device address, 2–4
data transfer rate, 1–5
device address, 2–6
device addresses, 2–4
internal length, 2–4
length, 1–5, 2–4
maximum devices, 1–5
serially connected, 1–5
target ID, 2–4
termination, 2–4
transfer rate, 2–4
SCSI Cables, 1–4
Security
storage devices, 3–2
Service, 4–1
exchanging storage devices, 4–1
Small Computer System Interface
See SCSI
Specifications, A–1
cooling, A–1
electrical, A–1
environmental, A–2
environmental stabilization, A–3
physical, A–1

Index–2

Status LED
device fault
error conditions, 2–3
Status LEDs
3½-inch SBBs, 2–2
5¼-inch, half-height devices, 2–2
control of, 2–3
device activity, 2–2
device fault, 2–2
power, 2–2
Storage devices, 1–7
3½-inch SBB, 1–7
5¼-inch, half-height, 1–3, 1–7
exchanging, 1–7
included, 1–2
installing, 1–7
optional, 1–2
qualified, 1–3
specifications, 1–2
Switches
device address, 2–6

T
Temperature
ranges, A–3
Terminating SCSI bus, 2–4
Thermal stabilization, A–3
TZ30–VE Cartridge Tape Drive device addressing,
2–6

W
Warm-swap, 3–5