Viper 60s, 150s, 125s Theory Of Operation And Maintenance Manual
Models 608, 1258, and 150S
1/4-lnch
Streaming Cartridge Tape Drive
.
,
Theory
of
Operation
and
Maintenance
Manual
~J!YE'
____________
---1
Viper®
SCSI
Models 60S, 125S, and 150S
1/4-lncl1
Streaming Cartridge Tape Drive
Theory
of
Operation
and
Maintenance
Manual
I
DATE
July, 1989
Dec., 1989
REVISION
RECORD
REV
REVISED
PAGES
A
B
New
Page
3-5
ii
Manual Part
Number
21981-001
Copyright © 1989
by
Archive Corporation. All rights
reserved.
No
part
of this publication
may
be reproduced, stored in a retrieval system, or transmitted, in
any form
or
by
any means, electronic, mechanical,
photocopying, recording
or
otherwise, without the
prior written permission of the publisher.
Archive
and
Viper are registered trademarks of Ar-
chive
Corporation.
Product features
and
specifications described in this
manual are subject to change without notice.
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERA TION
AND
MAINTENANCE
PREFACE
Archive Viper tape drives are manufactured to ensure high performance in a
1/
4-inch
streaming tape drive. Viper enhanced mechanics
and
performance features include
an
embed-
ded
controller in a half-high
5-1/4
inch form factor drive.
The
manual
contains detailed technical information about Viper SCSI (Small Computer
Systems Interface) tape drives.
SCSI technology provides a flexible environment by allowing
up
to eight devices to be daisy chained. Archive Viper drives conform
to
ANSI Specification
X3.31
and
QIC tape format standards.
Archive's commitment to high quality
and
advanced technology
mean
Viper tape drives are
efficient
and
reliable for
data
backup in varied installations
and
environments.
iii
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERA TION
AND
MAINTENANCE
CONTENTS
Chapter 1
Introduction ...............................................................................................................................
1-1
1.1
Overview ...............................................................................................................................
1-1
1.2 Viper Capacities ...................................................................................................................
1-1
1.3 PhYSical Description ...........................................................................................................
1-1
1.4 System Configurations ....................................................................................................... 1-2
1.5 Viper Drive Models ............................................................................................................
1-3
1.6
About This Manual .............................................................................................................. 1-4
Chapter 2
Specifications ...........................................................................................................................
2-1
2.1
Overview...... ....... ................... .......
....
............................ ............................... ................. ......
2-1
2.2 Physical Specifications ......................................................................................................
2-1
2.3
Power
Requirements ......................................................................................................... 2-2
2.3.1
Power
Connector ....................................................................................................... 2-2
2.4 Drive Performance Specifications ................................................................................... 2-3
2.5
Environmental Specifications ...............
....
........... ........... ............... ............. ..................... 2-4
2.6
Data Cartridge Specifications .......................................................................................... 2-4
2.6.1
Model
60S
........ ....... ......................
....
......
........... ................... ................ ................ ..... 2-4
2.6.2 Model
125S
................................................................................................................
2-5
2.6.3 Model
150S
................................................................................................................
2-5
2.7 Regulatory Compliance ....................................................................................................
2-5
2.8
ANSI
X3.131
Conformance Statement ............................................................................ 2-6
Chapter 3
Installation .................................................................................................................................
3-1
3.1
Introduction ..........................................................................................................................
3-1
3.2 Guidelines
and
Cautions ............................................................. .....................................
3-1
3.3 Unpacking
and
Inspection...... ................................... ........... ................... .................. ......
3-1
3.4 Installation .......................................................................................................................... 3-2
3.5 Internal Viper Drives ........................................................................................................... 3-2
3.5.1
Mounting Screws ...................................................................................................... 3-2
3.5.2 Connectors ................................................................................................................. 3-3
3.5.3 Jumper Configuration
.... ....
...................... .......
....
......... ........
.....
...... ........................ 3-4
3.5.4 Operational Mode .................................................................................................... 3-4
3.5.5 Parity Enable ............................................................................................................. 3-4
3.5.6 Drive Identification .................................................................................................. 3-5
3.5.7 Selectable Buffer Disconnect .................................................................................... 3-5
3.6
Connecting External Vipers ............................................................................................... 3-6
3.6.1
SCSI Drive Identification Switch ............................................................................. 3-7
v
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERATION AND MAINTENANCE
Chapter 4
Interface ....................................................................................................................................
4-1
4.1
Overview.... .................................
.... ....
......... ....................................... .......................... ...... 4-1
4.1.1
ANSI SCSI Bus Standards.......... ............................................ ............. .................... 4-1
4.1.2
Signal Notation Conventions ................................................................................. 4-1
4.2
SCSI
Bus Connector Signals ............................................................................................. 4-2
4.3
Signal Descriptions
..
....
........................
....
............. .............. .....................
.....
.................
....
4-3
4.4
Command
Set Description.. ................. ........... ............................ ........... ................ .......... 4-4
4.5
SCSI
Bus Protocol............... ........
...
................. ....... .....................
...
................... ....... ........... 4-5
4.6
Waiting
and
Control Phases ............................................................................................. 4-6
4.6.1
Nonarbitrating Systems ........................................................................................... 4-6
4.6.2
Arbitrating Systems ................................................................................................. 4-6
4.7
Selection
and
Reselection Phases .............................. ............................ .......................... 4-9
4.8
Information Transfer Phases ........................................................................................... 4-10
4.8.1 Asynchronous Data Transfer ................................................................................ 4-10
4.8.1.1 Transfer from Target
to
Initiator ................................................................. 4-11
4.8.1.2
Transfer from Initiator to Target ................................................................. 4-12
4.9
Command
Phase ............................................................................................................... 4-13
4.10 Data Phase ........................................................................................................................ 4-13
4.10.1 Data-In Phase ......................................................................................................... 4-13
4.10.2 Data-Out Phase ...................................................................................................... 4-13
4.11
Status Phase ..................................................................................................................... 4-13
4.12
Message Phase ................................................................................................................. 4-13
4.12.1
Message-In Phase .................................................................................................. 4-13
4.12.2
Message-Out Phase ............................................................................................... 4-14
4.13
Con1mand Descriptor Block .......................................................................................... 4-14
4.14
SCSI
Message Descriptions
and
Definitions ............................................................... 4-16
4.15
SCSI
Status Code Descriptions
and
Definitions ......................................................... 4-19
4.16
Attention Condition ....................................................................................................... 4-21
4.17
Reset Condition ............................................................................................................... 4-21
4.18
Unit Attention Condition .............................................................................................. 4-21
4.19
Buffered Mode ................................................................................................................. 4-22
4.20 Imn1ediate Function ....................................................................................................... 4-22
4.21
Residual Length Function ............................................................................................. 4-22
4.22
Disconnect/Reconnect Function .................................................................................. 4-24
4.23
SCSI Memory Address Pointers ................................................................................... 4-25
4.23.1
Current Data Pointers ........................................................................................... 4-25
4.23.2
Saved Data Pointers .............................................................................................. 4-25
4.24
Early Warning Function ................................................................................................ 4-25
4.25
Error Reporting ............................................................................................................... 4-26
4.25.1
Soft Errors ............................................................................................................... 4-26
4.25.2
Hard
Errors ............................................................................................................ 4-26
4.26
SCSI
Bus Phase Timing .................................................................................................. 4-26
vi
VIPER SCSI 60. 125 & 150 THEORY
OF
OPERA TlON AND MAINTENANCE
Chapter 5
Viper
SCSI
Commands ............................................................................................................
5-1
5.1
Introduction
.........................................................................................................................
5-1
5.2
Descriptor
Block .................................................................................................................. 5-2
5.2.1
Command
Descriptor Block
Format
...................................................................... 5-2
5.2.2
Command
Descriptor
Block Field Descriptions ................................................... 5-2
5.2.3 Flag
and
Link Bit Descriptions ................................................................................ 5-3
5.3
TEST
LTNIT
READY
(OOh)
.................................................................................................. 5-4
5.3.1
TEST
UNIT
READ
Command
Descriptor Block .................................................. 5-4
5.3.2
Completion
Status ..................................................................................................... 5-4
5.4 REWIND
(Olh) .................................................................................................................... 5-5
5.4.1 REWIND
command
Descriptor Block ................................................................... 5-5
5.4.2
Command
Descriptor Block Field DescriAtion .................................................... 5-5
5.4.3
Completion
Status
..................................................................................................... 5-5
5.5
REQUEST BLOCK ADDRESS (02h) ................................................................................ 5-6
5.5.1
REQUEST BLOCK ADDRESS
Command
Descriptor Block .............................. 5-6
5.5.2
Command
Descriptor
Block Field .......................................................................... 5-6
5.5.3
REQUEST BLOCK ADDRESS Data
Format
......................................................... 5-6
5.5.4
REQUEST BLOCK ADDRESS Data Field Description ........................................ 5-7
5.5.5
Completion
Status ..................................................................................................... 5-7
5.6
REQUEST SENSE ( 03h ) ...................................................................................................
5-S
5.6.1 REQUEST SENSE
Command
Descriptor Block ...................................................
5-S
5.6.2
Command
Descriptor Block Field Description ....................................................
5-S
5.6.3
Extended
Sense
Data
Format .................................................................................. 5-9
5.6.4
Extended
Sense Data Field Descriptions ............................................................. 5-10
5.6.4
Extended
Sense
Data
Field Descriptions
Continued
..........................................
5-11
5.6.5 Priority
and
Definition of Sense Keys ................................................................... 5-12
5.6.6
Completion
Status
.................................................................................................... 5-13
5.7 READ
BLOCK LIMITS (05h) ........................................................................................... 5-14
5.7.1 READ
BLOCK LIMITS
Command
DeSCriptor Block ......................................... 5-14
5.7.2
Command
Descriptor Block Field Descriptions .................................................. 5-14
5.7.3 READ
BLOCK LIMITS Data Format.. ................................................................... 5-14
5.7.4
Completion
Status .................................................................................................... 5-15
5.8 READ (aSh) ......................................................................................................................... 5-16
5.8.1 READ
Command
Descriptor Block ....................................................................... 5-16
5.8.2
Command
Descriptor Block Field Descriptions .................................................. 5-16
5.S.3 READ
Command
Description ................................................................................ 5-16
5.8.3.1
End
of
Data ...................................................................................................... 5-17
5.S.3.2
Filen·lark., ....................................................................................................... 5-17
5.8.3.3 Transfer Length
Satisfied .............................................................................. 5-17
5.8.3.4
End
of
Tape
(EOT) .......................................................................................... 5-17
5.8.3.5 Unrecoverable
Data
Error
............................................................................. 5-17
5.8.4
Completion
Status .................................................................................................... 5-18
5.9 WRITE
(OAh)
...................................................................................................................... 5-19
5.9.1 WRITE
Command
Descriptor Block ..................................................................... 5-19
vii
VIPER
SCSI
60,
125
& 150 THEORY
OF
OPERA TlON
AND
MAINTENANCE
5.9.2
Command
Descriptor Block Field Descriptions .................................................. 5-20
5.9.3 Completion Status .................................................................................................... 5-20
5.9.3 Completion Status Continued ...............................................................................
5-21
5.10 SEEK BLOCK
(OCh)
......................................................................................................... 5-22
5.10.1
SEEK BLOCK
Command
Descriptor Block ....................................................... 5-22
5.10.2
Command
Descriptor Block Field Descriptions ................................................ 5-22
5.10.3 Completion Status .................................................................................................. 5-23
5.11
WRITE FILEMARKS (10h) ............................................................................................. 5-24
5.11.1 Write Filemark
Command
Descriptor Block ..................................................... 5-24
5.11.2
Command
Descriptor Block Field Descriptions ................................................ 5-24
5.11.3 Completion
Status .................................................................................................. 5-25
5.12
SPACE (11h) ..................................................................................................................... 5-26
5.12.1
SPACE
Command
Descriptor Block ................................................................... 5-26
5.12.2
Command
DeSCriptor Block Field Descriptions ................................................ 5-27
5.12.3 Space-by-Count Functions .................................................................................... 5-27
5.12.4
Space
by
Position Functions ................................................................................. 5-28
5.12.5 Completion
Status .................................................................................................. 5-28
5.13 INQUIRY (12h) .................................................................................................................
5-30
5.13.1
INQUIRY
command
Descriptor Block ................................................................ 5-30
5.13.2
Command
Descriptor Block Field Description .................................................. 5-30
5.13.3 INQUIRY
Command
Data Format ......................................................................
5-31
5.13.4 INQUIRY
Command
Data Field Descriptions ..................................................
5-31
5.13.5 Completion Status .................................................................................................. 5-32
5.14 VERIFY (13h) .........................................................................................
..,
......................... 5-33
5.14.1
VERIFY
Command
Descriptor Block .................................................................. 5-33
5.14.2
Command
Descriptor Block Field ....................................................................... 5-33
5.14.3 Con1pletion
Status .................................................................................................. 5-34
5.15 RECOVER BUFFERED DATA
04h)
............................................................................. 5-35
5.15.1
RECOVER BUFFERED DATA
Command
Descriptor Block .......................... 5-35
5.15.2
Command
Descriptor Block Field Descriptions ................................................ 5-35
5.15.3 Completion Status .................................................................................................. 5-36
5.16 MODE SELECT (ISh) .................................................................................... : ................. 5-37
5.16.1
MODE SELECT
Command
Descriptor Block .................................................... 5-37
5.16.2
Command
Descriptor Block Field Description .................................................. 5-37
5.16.3 Parameter List
Header
Format ............................................................................. 5-37
5.16.4 Parameter List
Header
Field Descriptions ......................................................... 5-38
5.16.5 Parameter
List-Block
DeSCriptor ....................................................................... 5-38
5.16.6 Parameter
List-Block
Descriptor Field Descriptions ...................................... 5-39
5.16.7 Paranleter
List-Block
Descriptor Field Descriptions ...................................... 5-40
5.16.8 COlnpletion Status ..................................................................................................
5-41
5.17
RESERVE
UNIT (16h) ..................................................................................................... 5-42
5.17.1
RESERVE
UNIT
Command
Descriptor Block ................................................... 5-42
5.17.2
Command
Descriptor Block Field Descriptions ................................................ 5-43
5.17.3 Completion
Status .................................................................................................. 5-43
viii
VIPER
SCSI
60, 125 & 150 THEORY
OF
OPERA TION
AND
MAINTENANCE
5.18 RELEASE UNIT (17h) ..................................................................................................... 5-44
5.18.1
RELEASE UNIT
Command
Descriptor Block ................................................... 5-44
5.18.2
Command
Descriptor Block Field Descriptions ................................................
5-44
5.18.3 Completion Status .................................................................................................. 5-45
5.19
COpy
(18h) ....................................................................................................................... 5-46
5.19.1
Command
Descriptor Block .................................................................................
5-46
5.19.2
Command
Descriptor Block Field Description .................................................
5-46
5.19.3
COpy
Command
Description .............................................................................. 5-46
5.19.4 COPY Parameter List
Header
Block ................................................................... 5-47
5.19.5 Parameter List
Header
Block Field Descriptions ..............................................
5-48
5.19.6
D/
A to SEQ Segment Descriptor ......................................................................... 5-48
5.19.6.1
D/
A to SEQ Segment Descriptor Block .................................................... 5-49
5.19.6.2
D/
A to SEQ Segment Descriptor Field Descriptions .............................. 5-49
5.19.7 SEQ to
D/
A Segment Descriptor .........................................................................
5-50
5.19.7.1 SEQ to
D/
A Segment Descriptor Block .................................................... 5-50
5.19.7.2 SEQ to
D/
A Segment Descriptor Field
~escriptions
..............................
5-51
5.19.8 SEQ to SEQ Segment Descriptor ..........................................................................
5-51
5.19.8.1 SEQ to SEQ Segment Descriptor Block ..................................................... 5-52
5.19.8.2 SEQ to SEQ Segment Descriptor Field Descriptions ............................... 5-53
5.19.9 Completion Status .................................................................................................. 5-54
5.20 ERASE (19h) ..................................................................................................................... 5-56
5.20.1
ERASE
Command
Descriptor Block ................................................................... 5-56
5.20.2
Command
Descriptor Block Field Descriptions ................................................
5-56
5.20.3 Completion Status .................................................................................................. 5-57
5.21
MODE SENSE (IAh) ....................................................................................................... 5-58
5.21.1
MODE SENSE
Command
Descriptor Block ...................................................... 5-58
5.21.2
Command
Descriptor Block Field Description ................................................. 5-58
5.21.3 MODE SENSE
Header
Data Format ................................................................... 5-58
5.21.4
MODE SENSE
Header
Data Field Descriptions ................................................ 5-59
5.21.5 Block Length DeSCriptor Field Descriptions ...................................................... 5-60
5.21.5.1Density Code, Byte 0 .................................................................................... 5-60
5.21.5.2 Implicit Mode - Default Density Code Mode ........................................... 5-60
5.21.5.3 Explict Mode ..................................................................................................
5-61
5.21.5.4
Number
of Blocks, Bytes 1 to 3 ...................................................................
5-61
5.21.5.5 Block Length, Bytes 5 to 7 ............................................................................
5-61
5.21.6 Completion Status .................................................................................................. 5-62
5.22
LOAD/UNLOAD
(IBh) ................................................................................................ 5-63
5.22.1
LOAD/UNLOAD
Command
Descriptor Block ................................................ 5-63
5.22.2
Command
Descriptor Block Field Descriptions ................................................ 5-63
5.22.3 Completion Status ..................................................................................................
·5-64
5.23 SEND DIAGNOSTIC (1Dh) ........................................................................................... 5-65
5.23.1
SEND DIAGNOSTIC
Command
Descriptor Block .......................................... 5-65
5.23.2
Command
Descriptor Block Field ....................................................................... 5-65
5.23.3 COlnpletion Status ..................................................................................................
5-66
ix
VIPER
SCSI
60, 125 & 150
THEORY
OF
OPERATION AND MAINTENANCE
5.24 PREVENT / ALLOW Media Removal (1Eh) ..... , .......... , .... , .......................................... 5-67
5.24.1
PREVENT/ALLOW MEDIA REMOVAL
Command
Descriptor Block ....... 5-67
5.24.2
Command
Descriptor Block Field Description ................................................. 5-67
5.24.3 Completion
Status .................................................................................................. 5-68
5.25 WRITE DATA BUFFER (3Bh) ........................................................................................ 5-69
5.25.1 WRITE DATA BUFFER
Command
Descriptor Block ...................................... 5-69
5.25.2
Command
Descriptor Block Field ....................................................................... 5-70
5.25.3 WRITE DATA BUFFER
Data
Header
................................................................. 5-70
5.25.4 Completion Status ..................................................................................................
5-71
5.26 READ DATA BUFFER (3Ch) ......................................................................................... 5-72
5.26.1 READ DATA BUFFER
Command
Descriptor Block ........................................ 5-72
5.26.2
Command
Descriptor Block Field ....................................................................... 5-72
5.26.3 READ DATA BUFFER
Header
............................................................................ 5-73
5.26.4 READ DATA BUFFER
Header
Field .................................................................. 5-73
5.26.5 Completion
Status .................................................................................................. 5-73
Chapter 6
Theory
of
Operations ..............................................................................................................
6-1
6.1
Overview
..............................................................................................................................
6-1
6.2
Printed Circuit Board .........................................................................................................
6-1
6.2.1
Basic VLSI Controller ................................................................................................ 6-3
6.2.2 Write
and
Erase Circuits ..........................................................................................
6-5
6.2.3 Read Circuits .............................................................................................................. 6-6
6.2.4
Tape
Hole
Sensor ....................................................................................................... 6-7
6.2.5 Phase Lock Loop ........................................................................................................ 6-7
6.2.6 Reset Circuits ............................................................................................................. 6-7
6.3
Data Transfer .......................................................................................................................
6-8
6.3.1
Erase Operation .........................................................................................................
6-8
6.3.2 Write Data (Backup) Operation .............................................................................. 6-9
6.3.3 Read Data (Restore) Operation .............................................................................. 6-10
6.4 Drive Mechanics ................................................................................................................ 6-10
6.4.1
Loading Mechanism ................................................................................................ 6-10
6.4.2 Cartridge Loading .................................................................................................... 6-10
6.4.3 Cartridge Removal ...................................................................................................
6-11
6.4.4
Tape
Motion ..............................................................................................................
6-11
6.5
Sensors/Interlocks .............................................................................................................
6-11
6.5.1
Cartridge
Switch Assembly ....................................................................................
6-11
6.5.2 Write Protect ............................................................................................................. 6-12
6.5.3
Tape
Hole Sensors .................................................................................................... 6-12
6.6
Motor Driver Printed Circuit Board ............................................................................... 6-12
6.6.1
Interface ..................................................................................................................... 6-13
6.6.2 Motor Controller
LSI
................................................................................................ 6-14
6.6.3
EPROM Interface ...................................................................................................... 6-16
6.7
Head
Assembly .................................................................................................................. 6-16
6.7.1
Read/Write
Head
Operation ................................................................................. 6-16
6.7.2 Serpentine Recording .............................................................................................. 6-18
x
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERATION
AND
MAINTENANCE
6.8
Firmware .............................................................................................................................
6-21
6.8.1 Write
Error
Recovery ...............................................................................................
6-21
6.8.2 Write Buffer
Underrun
............................................................................................ 6-23
6.8.3 Read Buffer
Underrun
............................................................................................. 6-23
6.8.4 Read
Data
Errors ...................................................................................................... 6-24
6.8.5 Streaming Termination ............................................................................................ 6-24
6.9
Data Cartridge .................................................................................................................... 6-26
6.9.1
Tape
Operation
......................................................................................................... 6-28
6.9.2 Recording ...................................................................................................................
6-28
6.9.2.1 Preamble ..........................................................................................................
6-29
6.9.2.2 Data Block Marker ..........................................................................................
6-29
6.9.2.3 Data Block ........................................................................................................ 6-29
6.9.2.4 Block
Address
.................................................................................................. 6-30
6.9.2.5 Cyclical
Redundancy
Check .........................................................................
6-31
6.9.2.6 Postamble .........................................................................................................
6-31
6.9.2.7 Format Differences ......................................................................................... 6-32
Chapter
7
Maintenance
and
Relaibility
..................................................................................................
7-1
7.1
Maintenance ........................................................................................................................
7-1
7.2 Tape Drive Cleaning ..........................................................................................................
7-1
7.2.1
Cleaning Supplies .....................................................................................................
7-2
7.2.2 Cleaning
the
Tape Drive
Heads
.............................................................................. 7-2
7.3 Reliability .............................................................................................................................
7-3
7.4
Reporting a Problem ........................................................................................................... 7-4
Glossary
.....................................................................................................................................
G-1
Index
..........................................................................................................................................
I-1
xi
VIPER
SCSI
60,
125 &
150
THEORY
OF
OPERA
TlON
AND
MAINTENANCE
FIGURES
Figure
1-1.
SCSI Bus Support Configurations ........................................................................ 1-2
Figure
1-2.
Top View of Viper Drive ......................................................................................... 1-3
Figure
1-3.
Front View of Viper External Drive ......................................................................
1-3
Figure 3-1. Internal Installation .................................................................................................. 3-2
Figure
3-2.
Mounting Hole Locations ....................................................................................... 3-3
Figure 3-3. Viper Rear View ....................................................................................................... 3-3
Figure 3-4. Configuration
Jumper
Block .................................................................................. 3-4
Figure 3-5. External Installation ................................................................................................. 3-6
Figure 3-6. Viper External Interface Connectors
and
ID
Switch ........................................... 3-6
Figure
3-7. Viper SCSI Daisy-Chain Diagram ......................................................................... 3-7
Figure
4-1.
Phase Sequencing with Nonarbitration ............................................................... .4-6
Figure
4-2.
Phase Sequencing with Arbitration ...................................................................... .4-7
Figure
4-3.
Arbitration
and
Selection Phase Signal Timing ................................................. .4-7
Figure
4-4.
Signals Used in Transfer from Target to Initiator .............................................
4-11
Figure
4-5.
Signals Used in Transfer from Initiator to Target ............................................. 4-12
Figure
6-1.
Viper Drive Functional Block Diagram ................................................................
6-2
Figure
6-2.
Cartridge Loading .................................................................................................
6-11
Figure
6-3.
Motor Driver
PCB
Block Diagram ....................................................................... 6-13
Figure
6-4.
Motor Controller
LSI
Functional Block Diagram .............................................. 6-14
Figure
6-5.
Read/Write/Erase
Magnetic
Head
Configuration ........................................... 6-16
Figure
6-6.
Typical Serpentine Recording .............................................................................. 6-18
Figure
6-7.
Track Positioning ................................................................................................... 6-19
Figure
6-8.
Serpentine Recording: 9-Track ............................................................................. 6-19
Figure
6-9.
Serpentine Recording: IS-Track' .......................................................................... 6-20
Figure
6-10.
Serpentine Recording:
18-
Track .......................................................................... 6-20
Figure
6-11.
Read After Write Error Sequence ....................................................................... 6-21
Figure
6-12.
Data Cartridge, Exploded View .......................................................................... 6-27
Figure
6-13.
Recorded Block Format ........................................................................................
6-28
Figure 6-14. Block Address Definition .....................................................................................
6-30
Figure
7-1.
Head
and
Sensor Cleaning ......................................................................................
7-3
xii
VIPER SCSI
60,
125 & 150 THEORY
OF
OPERA TION
AND
MAINTENANCE
TABLES
Table 1-1. Viper Streaming Tape Drive Storage Capacities ....................................................
1-1
Table 3-1. SCSI ID Selection ......................................................................................................... 3-5
Table 3-2. Buffer Disconnect Size Selection ...............................................................................
3-5
Table
4-1.
SCSI Signal Locations on Drive Connector ............................................................. 4-2
Table
4-2.
SCSI Interface Signals .................................................................................................
4-3
Table
4-3.
Group 0 Commands
for SCSI Bus Sequential Access Devices ............................
4-4
Table
4-4.
Operational Phases .....................................................................................................
4-5
Table
4-5.
Arbitration Phase Protocal ........................................................................................ 4-8
Table 4-6. Informtion Transfer Phases .....................................................................................
4-10
Table
4-7.
Command
Descriptor Block Format ..................................................................... .4-14
Table
4-8.
CDB Fields Common to
group 0 and 1 Commands
........................................... .4-15
Table
4-9.
SCSI Message Codes ................................................................................................. 4-16
Table
4-10. SCSI Message Definitions ............................................................................ .4-17, 4-18
Table 4-11. Status
Code
Definitions ........................................................................................ 4-19
Table 4-12. Status Code Block Format ....................................................................................
4-20
Table 4-13. SCSI Status
Code
Descriptions ............................................................................. 4-20
Table 4-14. SCSI Bus Sequence Timing ................................................................................... 4-27
Table
5-1.
SCSI
Commands
for Bus Sequential Access Devices ...........................................
.5-1
Table
6-1.
VLSI Features .......................................................................................................
6-3,
6-4
Table
6-2.
Motor
Controller
LSI
Functions .................................................................... 6-14,
6-15
Table
6-4.
Streaming Termination Description ............................................................. 6-24,
6-25
xiii
VIPER SCSI
60,
125 & 150 THEORY
OF
OPERATION
AND
MAINTENANCE
TABLES
Table
1-1.
Viper Streaming Tape Drive Storage Capacities ....................................................
1-1
Table
3-1.
SCSI ID Selection .........................................................................................................
3-5
Table
3-2.
Buffer Disconnect Size Selection ...............................................................................
3-5
Table
4-1.
SCSI Signal Locations on Drive Connector ............................................................. 4-2
Table
4-2.
SCSI Interface Signals .................................................................................................
4-3
Table
4-3.
Group a Commands
for SCSI Bus Sequential Access Devices ............................
4-4
Table
4-4.
Operational Phases .....................................................................................................
4-5
Table
4-5.
Arbitration Phase Protocal ........................................................................................
4-8
Ta ble 4-6. Informtion Transfer Phases .....................................................................................
4-10
Table 4-7.
Command
Descriptor Block Format ......................................................................
4-14
Table
4-8.
CDB Fields
Common
to
group a and 1 Commands
........................................... .4-15
Table
4-9.
SCSI Message Codes .................................................................................................
4-16
Table 4-10. SCSI Message Definitions ............................................................................ .4-17,
4-18
Table
4-11.
Status
Code
Definitions ........................................................................................
4-19
Table
4-12.
Status
Code
Block Format ....................................................................................
4-20
Table 4-13. SCSI Status
Code
Descriptions .............................................................................
4-20
Table 4-14. SCSI Bus Sequence Timing ...................................................................................
4-27
Table 5-1. SCSI
Commands
for Bus Sequential Access Devices .......................................... .
Table
6-1.
VLSI Features .......................................................................................................
6-3,
6-4
Table
6-2.
Motor Controller
LSI
Functions .................................................................... 6-14,
6-15
Table 6-4. Streaming Termination Description ............................................................. 6-24,
6-25
xiii
1.1
Overview
CHAPTER 1
INTRODUCTION
INTRODUCTION
Archive's
Vipe~
SCSI models
60S,
125S,
and
150S
are
1/4-inch
streaming tape drives that
provide
reliable
and
cost-efficient backup for high-capacity Winchester
disk
drives. Other
applications include software distribution, transaction logging,
data
collection, data
ex-
change,
and
program
loading. Viper SCSI drives, featuring
LSI
circuitry
and
surface-mount
technology, conform
to
ANSI
X3.131
and
QIC format standards. Backward
read
compatibility
with
previous Archive drives is
standard
with
all Viper models.
1.2 Viper Capacities
Viper drives are available in internal
and
external models. Storage capacity varies from
45
megabytes to 150 megabytes. Table
1-1
shows
the capacity for each model.
Table 1-1. Viper Streaming
Tape
Drive Storage CapaCities
VIPER
MODEL
STORAGE
CAPACITY
60S1
*
45
or
60
megabytes
125S1
125
megabytes
150S1
*
125
or
150
megabytes
Viper60E
60
megabytes
Viper
150E
150
megabytes
I
*Formatted capacity
is
determined by type of
data
cartridge used. Refer
to
Chapter
2 for
data
cartridge specifications.
1.3 Physical Description
The
Viper
drive
consists
of
multiple mechanical subassemblies, two electrical assemblies
(PCB's),
and
a front bezel. All
are
assembled in a half-height, 5
1/4-inch
drive
chassis
configured
to
fit inside a
standard
half-height floppy
disk
slot.
1-1
VIPER
SCSI
60,
125 & 150
THEORY
OF
OPERATION
AND
MAINTENANCE
1.4 System Configurations
The SCSI
standard
supports
up
to eight IDs. These IDs can refer
to
host adapters
or
peripheral
devices
such
as printers, magnetic disks, optical disks,
or
tape drives. Figure
1-1
shows
examples of
SCSI systems.
•
-
SCSI
Bus
-
Viper
Computer Host
System
Adapter
.......
,.
Drive
•
SINGLE INITIATOR· SINGLE TARGET
Computer Host
1-
SCSI
Bus
.....
Viper
System
Adapter
......
,..
Drive
•
SINGLE INITIATOR - MULTI TARGET
Magnetic
....
Disk,
,.
Printer,
or
Optical
Disks
Computer Host
.,
SCSI
Bus"
Viper
System Adapter
-.
...
Drive
Magnetic
-
Disk,
,.
Printer,
or
Optical
Disks
Magnetic
.....
Disk •
,.
Printer,
or
Optical
Disks
1-
Magnetic
Computer Host
-
Disk,
System Adapter
......
,..
Printer,
or
Optical
Disks
MULTI INITIATOR - MULTI TARGET
Figure 1-1.
SCSI
Bus Support Configurations
1-2
INTRODUCTION
1.5 Viper Drive Models
Figure 1-2 shows a
top
view of a Viper Internal drive and its subassemblies. Figure
1-3
shows
a front view of a Viper external drive.
BELT DRIVE SYSTEM
CAPSTAN DRIVE MOTOR
HEAD ACTUATOR MECHANISM
MOTOR DRIVER BOARD
CAPSTAN ASSEMBLY
--CHASSIS
BEZEL
Figure 1·2. Top View of Viper Drive
Figure 1-3. Front
View of Viper External Drive
1-3
VIPER
SCSI
60,
125 &
150
THEORY
OF
OPERATION
AND
MAIfv1ENANCE
1.6 About This Manual
The remaining chapters in this
manual
are described briefly in
the
table below.
Table
1-2.
Chapter
Descriptions
CHAPTER CHAPTER
NUMBER
TITLE
DESCRIPTION
2
Specifications
Contains
the
physical,
performance,
environmental,
power,
data
and
tape
handling,
tape
cartridge
I
specification
tables,
and
SCSI
conformance
statement.
I
3
Installation
I
Contains
guidelines,
cautions,
unpacking
tips,
and
I
inspection
information.
4
I
Interface
I
Describes
the
Viper
SCSI
interface
including
signals,
pin
assignments,
and
timing.
5
Viper
SCSI
I
Individually
describes
the
SCSI
sequential
access
device
Commands
commands
used
in
the
Viper
drive.
6
Theory
of
Details
the
functional
operation
of
each
assembly
of
the
Operation
Viper
drive
with
descriptions
of
the
tape
drive
cartridge
and
media
formats.
I
7
Maintenance
and
Gives
preventive
maintenance
schedule
and
procedures.
Reliability
Also
included
in
this
chapter
is
information
about
reporting
I
IJfUUltllIll:!.
I
1-4
2.1
Overview
CHAPTER 2
SPECIFICATIONS
SPECIFICA TlONS
Archive Viper SCSI drives provide reliable
backup
for microcomputer data. This chapter
includes technical specifications for all Viper models. Information included describes the
following specifications
and
requirements.
• Physical Specifications
•
Power
Requirements
• Drive Performance Specifications
• Environmental Requirements
• Data Cartridge Specifications
• Regulatory Compliance
• SCSI Conformance Statement
2.2 Physical Specifications
DIMENSION
CONFIGURATION
SPECIFICATION
US
METRIC
Internal
Height
1.625
in
41.27
mm
Width
5.750
in
146.00
mm
Depth
8.000
in
203.20
mm
Weight
3.0001b
1.36
kg
External
Height
3.500
in
89.00
mm
Width
6.600
in
168.00
mm
Depth
11.400
in
290.00
mm
Weight
8.0001b
3.65
kg
2-1
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERATION
AND
MAINTENANCE
2.3 Power Requirements
I
POWER
SUPPL Y VOLTAGE
SPECIFICATION
+12
VOLTS
+5
VOLTS
I
Tolerance
(inc!.
max.
±10%
±5%
I
ripple
of
100
mV)
Standby
Current
0.2
Amps
nominal
1.1
Amps
nominal
Operational
Current
0.8
Amps
nominal
1.1
Amps
nominal
I
1.7
Amps
maximum
1.5
Amps
maximum
I
Tape
Start
Surge
2.5
Amps
maximum
i
(up
to
300
msec)
Power
Dissipation
9.6
Watts
typical
5.5
Watts
typical
(operational)
22.4
Watts
maximum
7.8
Watts
maximum
i
33
Watts
maximum
i
(tape
start
surge)
2.3.1 Power Connector
FEATURE
SPECIFICATION
Input
Connector
AMP
641737-1
Mating
Connector
AMP
1-480424-0
Pins
AMP
60617-1
PIN
I
ASSIGNMENT
i
1
+12
VDC
2
+12
Retum
3
+5
Retum
4
+5
VDC
2-2
SPECIFICATIONS
2.4 Drive Performance Specifications
I
SPECIFICATION
i
FEATURE
6051
12551
I
15051
i
i
I
I
Capacity
450r60
MB
i
125
MB
I
125MB
or
(formatted)
I
150MB
I
Track
Format
9-Track
I
15-Track
15
or
18-Track
Serpentine
Serpentine
Serpentine
I
Flux
Density
10,000
ftpi
12,500
ftpi
I
12,500
ftpi
!
I
!
I
Data
Density
8,000
bpi
10,000
bpi
10,000
bpi
I
i
I
Data
Transfer
90
KB/Sec
112.5
KB/Sec
112.5
KB/Sec
I
Rate
(average)
i
Recording
Format
QIC-24
I
QIC-120
!
QIC-120
or
i
I I
QIC-150
SCS I Burst
Data
1.88
MB/Sec
Transfer
Rate
I
Data
Buffer
Size
56
KB
Tape
Speed
90
ips
Speed
Variations
Short
term
±4%
Long
term
±7'%
Start/Stop
Time
300
mSec
(maximum)
Head
Configuration
Two-track,
Read-after-write
(1
track
in
each
direction)
I
separate
full-width
erase
l
Recording
Code
I
..
GCR
(0,2)
Run
Length
limited
2-3
VIPER SCSI
60,
125 & 150 THEORY
OF
OPERA TION
AND
MAINTENANCE
2.5 Environmental Specifications
REQUIREMENT
SPECIFICATION
OPERATIONAL
NON-OPERATIONAL
Temperature
+5°
to
+45°C
-30°
to
+60°C
(
+41 ° to + 113 ° F)
(-22°to + 140°F)
Thermal
Gradient
1°
C/minute
1°
C/minute
Relative
Humidity
20%
to
80%
non-condensing
5 %
to
85%
non-condensing
Maximum
Wet
26°
C
Bulb
Temperature
Altitude
-1,000
to + 15,000
ft.
-1,000
to
+50,000
ft.
Shock
2.5 9 maximum,
11
mSec
25 9 maximum,
11
mSec
Vibration
(1/2
sine
wave)
0.005
in.
maximum
0.1
in.
maximum
peak-peak
displacement
5
Hz
to
63
Hz
5
Hz
to
17
Hz
peak
acceleration
0.5 9 maximum
1.5 9 maximum
63
Hz
to
500
Hz
17Hzt0500Hz
2.6 Data Cartridge Specifications
The Viper drives record to
maximum
capacity
when
Models
60S
and
1255
use
DC600A type
data
cartridges
and
the Model 1505 uses DC600XTD type
data
cartridges. To enable
backward
compatibility in all models, Viper drives can also recognize different types of
data
cartridges,
and
can write
and
read
various QIC
standard
tape
formats.
The following tables list
data
cartridges qualified for
use
in the Viper drives,
plus
the
performance functions of each
data
cartridge
with
respect to the drive. The function
column
includes
backward
compatibility.
2.6.1 Model 60S
I
DATA
CARTRIDGE
DATA
ARCHIVE
DRIVE
FUNCTIONS
SPECIFICATION
CARTRIDGE
MODEL
READ/WRITE
READ
ONLY
ANSI
BSR
X3.127
DC300XLP
545
(450
It)
OIC-24
format
OIC-11
format
ANSI
X3B5/85-138
DC600A
560
(600
It)
OIC-24
format
OIC-11
format
ANSI
X385/87-217
DC600XTD
660
(600
It)
OIC-24
format
OIC-11
format
2-4
SPEC/FICA
nONS
2.6.2 Model 125S
I
DATA
CARTRIDGE
DATA
ARCHIVE
DRIVE
FUNCTIONS
.
SPECIFICATION
CARTRIDGE
MODEL
READ/WRITE
READ
ONLY
ANSI
BSR
X3.127
DC300XLP
545
(450
It)
QIC-24
and
QIC-11
format
ANSI
X3B5/85-138
DC600A
560
(600
It)
Q
IC-120
format
QIC-24
and
QIC-11
format
ANSI
X3B5/87-217
DC600XTD
660
(600
It)
QIC-120
format
QIC-24
and
QIC-111ormat
2.6.3 Model 150S
DATA
CARTRIDGE
DATA
ARCHIVE
DRIVE
FUNCTIONS
SPECIFICATION
CARTRIDGE
MODEL
READ/WRITE
READ
ONLY
I
ANSI
BSR
X3.127
DC300XLP
545
(450
It)
QIC-24
and
QIC-11
format
ANSI
X3B5/85-138
DC600A
560
(600
It)
QIC-120
format
QIC-24
and
".1
''''I
OC
()
l.5
Q
QIC-11
ANSI
X3B5/87-217
QIC-150
and
QIIC-24
DC600XTD
660
(600
It)
QIC-120
format
QIC-11
format
2.7 Regulatory Compliance
Archive Viper drives comply with the regulations listed in the following table.
AGENCY
CSA
I
IEC
UL
TUV
FCC
I
REGULATION
I
C22.2
No.220 I 435,380
478
DIN
IEIC
380IVDE
0806
Class
B
2-5
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERA TlON
AND
MAINTENANCE
2.8 ANSI X3.131 Conformance Statement
•
GENERAL
FEATURES
1.
Supports
Arbitration
2.
Disconnect/Reconnect
3.
Single-ended
drivers
4.
Termination
power
supplied
to
the
cable
(jumper
option)
5.
Supports
both
single
and
mUlti-initiator
systems
6.
Fixed
block
transfer
lengths
only
7.
Hard
reset
B.
Parity
implemented
(enabled
with
jumper
option)
9.
Space
blocks,
filemarks,
sequential
filemarks,
and
EOD
(forward
and
reverse)
10.
Mode
Select
allows
selection
of
explicit
read/write
format
11.
Supports
third-party
reservation
12.
Verify
is
Medium
verification
only
LEVEL
0,1,
and 2 of
ANSI
REV
178
OPTIONAL
COMMANDS
1-
Test
Unit
Ready
B.
Release
Unit
2.
Send
Diagnostic
9.
Erase
3.
Space
10.
Mode
Sense
4.
Verify
11.
Load/Unload
5.
Recover
Buffered
Data
12.
Copy
6.
Mode
Select
13.
ReadlWrite
Data
Buffer
7.
Reserve
Unit
OPTIONAL
MESSAGES
Send
1.
Save
Data
Pointer
4.
Linked
Command
Complete
2.
Disconnect
5.
Linked
Command
Complete
with
flag
3.
Message
Reject
6.
Identify
Receive
1.
Initiator
Detected
Error
4.
No
operation
2.
Abort
5.
Bus
Device
Busy
3.
Message
Reject
6.
Identify
7.
Restore
Pointers
VENDOR
UNIQUE
COMMANDS
1.
Seek
block
2.
Request
block
address
2-6
3.1
Introduction
CHAPTER 3
INSTALLATION
INSTALLA
TlON
This chapter briefly describes installation procedures for internal
and
external Viper tape
drives
but
does not contain detailed instructions.
The Archive external Viper requires
an
adapter card. The
SC402
adapter
for
PC/
AT
compat-
ible computers
and
the
SC409
adapter for
PS/2
and
compatible computers are available from
Archive Corporation.
3.2 Guidelines and Cautions
The following guidelines
and
cautions are industry standards
and
apply to handling and
installing all Archive products.
• Archive drives contain components that are sensitive to static electricity. They are
shipped in protective anti-static bags. Do not remove the drive from the anti-static bag
until you are ready to install
it.
• Before removing a circuit board
or
drive from the protective packaging, discharge
static electricity from
your
body
by touching the computers metal surface or any
known
grounded
surface.
• Hold the drive by its edges only; touching the printed circuit board can cause
component damage. Lay the drive only on top of the bag or return
it
to the bag.
• Clean the head at the recommended intervals. Failure to
do
this can cause excessive
data
errors.
• Maintain input power within specification limits to insure reliable operation.
3.3 Unpacking and Inspection
Archive products are inspected
and
carefully packaged at the factory; however, damage can
occur
during
shipping. Follow these steps for inspecting
and
unpacking.
1. Visually inspect shipping containers; notify
your
carrier immediately of any damage.
2.
Place shipping containers on a flat, clean, stable surface; carefully remove
and
verify
contents.
If
parts are missing
or
equipment
is
damaged, notify
your
Archive represen-
tative.
3.
Save containers
and
packing materials for any future reshipment.
3-1
VIPER
SCSI
60,
125 & 150 THEORY
OF
OPERA
nON
AND
MAINTENANCE
3.4 Installation
Viper drives can be
mounted
inside a microcomputer
and
connected through the interface
and
power
cables
or
installed externally
and
connected through the interface cable
and
power
cable. The following sections briefly described important installation procedures,
3.5 Internal Viper Drives
The Viper drive can
be
installed horizontally
or
vertically as
shown
in Figure
3-1.
Horizontal
installation
is recommended.
When
vertical mounting is preferred, install the drive
with
the
head-loading lever
at
the top as shown.
Figure 3-1. Internal Installation
3.5.1 Mounting Screws
The drive chassis contains threaded
mounting
holes for 6-32 screws.
Four
are
located
on
the
bottom
and
two are
on
each side
of
the frame. See Figure
3-2.
When
mounting
vertically, use
three
of
the four screw holes to fasten the drive. Tighten the screws 5.3 inch-pounds
or
2-1/2
turns.
Over
tightening can cause excessive stress to the
drive
chassis.
3-2
6-32
UNG-2B
8 Places
3.5.2 Connectors
©
1---------------
5
.875"---~----1
Figure 3·2. Mounting Hole Locations
1.625
INSTALLA
TlON
8.000"
3.125"
typo
Power
and
interface connectors are located on the back of the drive as
shown
in Figure
3-3.
The
recommended interface mating connector is a 3M
3425-6600, Burndy FRE-50BF-1, KEL-AM
RFM2S-2852-0,
or
equivalent. The recommended
power
mating connector requires an AMP
1-
48024-0 housing with AMP
60617-1
pins
or
equivalent.
PIN 1
INTERFACE CONNECTOR
Figure 3·3. Viper Rear View
3-3
VIPER
SCSI
60,
125 &
150
THEORY
OF
OPERATION
AND
MAINTENANCE
3.5.3 Jumper Configuration
The configuration jumper block is located on the rear assembly. Interface configuration or
programming
is accomplished on
the
configuration jumper block with jumper clips (Archive
PIN
15864-001) as
shown
in Figure 3-4.
BUFFER
DISCONNECT
SIZE
(16K)
i i
• •
• •
• •
•
•
• •
OPERATION
MODE
L...--.-....I
SCSI
10
• •
SERIAL
• •
DIAGNOSTIC
•
•
PARITY ENABLE
OPERATION
MODE
~
INDICATES JUMPER
~
INSTALLED
CF2
•
•
CF1
•
•
CFO
•
•
BUFFER
SCSI
DISCONNECT
100
SIZE
(16K)
Figure
3-4.
Configuration
Jumper
Block.
3.5.4 Operational Mode
102
101
100
In the Operational Mode, with no jumper clip in the Diagnostic position, the jumper pairs
specify the following:
• Enable or disable parity
check
• Select buffer disconnect size.
• Specify Viper drives SCSI bus
ID.
3.5.5 Parity Enable
Parity check is enabled by installing a single jumper pair clip in the Parity Enable location
as
shown in Figure 3-4.
3-4
INSTALLATION
3.5.6 Drive Identification
In multi-user
and
multi-initiator systems with more than two SCSI devices including the host,
each device
must
have a unique
ID.
The ID determines controller arbitration priority, with
IDO
the lowest priority. Viper ID jumpers are shown in Figure 3-4
and
defined in Table
3-1.
Initiators
should
have high priority IDs. Standard configuration Viper drives are factory set
to
100.
Table 3-1. SCSI ID Selection
,~-
.....
I
I
.....
I
....
10
NO.
0*
1
2 3 4
JUMPER
I
102
I
I
X
X
X X
101
!
!
X X
X
i
X
100
I
X
I
I
X X
X =
Jumper
Installed
•
Standard
Configuration,
Factory
Setting
3.5.7 Selectable Buffer Disconnect
The buffer disconnect size sets the maximum number of bytes that can be sent over the SCSI
bus
during
a single
data
transfer phase. During lengthy
data
transfers, this feature periodi-
cally frees the
bus
for other operations; thus, disconnect size can affect overall system
performance where more than two SCSI devices
must
arbitrate for bus time.
Optimum
disconnect size is a function of both the number of devices
and
the speed
at
which they
independently process data bursts.
Since all
but
the current Target
and
Initiator must wait for the
bus
to proceed with data
transfers, disconnect size should be set
to
permit
bus
arbitration
at
intervals that optimize the
off-bus processing multiple devices can perform in parallel.
..
Table 3-2. Buffer Disconnect Size Selection
c:
~-
.~.~~-
....
-f~~-
! I
BUFFER
SIZE
.
2K
4K
6K • 8K
JUMPER
....
I I
....
_. --+_
..
~_+--_
..
+--
__
+
-~------i
~
:.1
~~:}
--
X I X I
~_
~....
-'---_--'--X
..
__
,~~_
..
L-----1
16K*
12K
X
X
, X =
Jumper
Installed
•
Disconnect
size
setting
of
16K
is
minimum
for
using
the
Copy
command.
3-5
VIPER SCSI 60, 125 & 150 THEORY
OF
OPERATION
AND
MAINTENANCE
3.6 Connecting External Vipers
The External Viper can be operated vertically
or
horizontally as
shown
in Figure 3-5.
Figure 3-5. External Installation
The External Viper has two interface connectors to allow daisy chaining. See Figure 3-6.
• When the Viper
is
the last drive, a single interface cable is attached to
one
connector
and
a tenninating
plug
is
installed in the other.
• When the Viper is within the chain, interface cables from the preceding
and
following
drives are connected. No tennination
is
required. See Figure 3-7.
POWER CORD
CONNECTOR
SCSI
CONNECTORS
POWER SWITCH
ID
SELECT
Figure 3-6. Viper External Interface Connectors and
10
Switch
3-6
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