600 Series
6U CPCI Redundant Backplane/Midplane & Chassis
User Manual
Sales Office: +1 (301) 975-1000
Technical Support: +1 (301) 975-1007
E-mail: support@patton.com
WWW: www.patton.com
Document Number: 600001U Rev. A
Part Number: 07M600001-A
Revised: November 13, 2001
Patton Electronics Company, Inc.
7622 Rickenbacker Drive
Gaithersburg, MD 20879 USA
tel: +1 (301) 975-1000
fax: +1 (301) 869-9293
support: +1 (301) 975-1007
web: www.patton.com
e-mail: support@patton.com
Copyright © 2000, 2001, Patton Electronics Company. All rights reserved.
The information in this document is subject to change without notice. Patton
Electronics assumes no liability for errors that may appear in this document.
Any software described in this document is furnished under license and may
be used or copied only in accordance with the terms of such license.
Contents
Contents ......................................................................................................................................................... 3
About this guide .....................................................................................................................................................7
Audience................................................................................................................................................................. 7
Structure................................................................................................................................................................. 7
Precautions ............................................................................................................................................................. 8
Style conventions used in this document................................................................................................................. 8
Typographical conventions used in this document.................................................................................................. 9
General conventions .........................................................................................................................................9
Mouse conventions ...........................................................................................................................................9
Bibliography ......................................................................................................................................................... 10
1 Introduction.................................................................................................................................................. 11
Product features and benefits.................................................................................................................................12
What is CompactPCI?...........................................................................................................................................12
About Patton Electronics Company ......................................................................................................................13
2 Chassis specifications .................................................................................................................................... 15
6U CPCI subrack..................................................................................................................................................16
Chassis description, front side................................................................................................................................16
Chassis description, rear side..................................................................................................................................18
Electromagnetic compatibility (EMC)...................................................................................................................18
Electrostatic discharge (ESD) protection................................................................................................................19
Materials specifications—Models 601 and 602 chassis...........................................................................................21
Patton Electronics’ product interfaces....................................................................................................................22
Model 5406 6U Redundant Backplane/Midplane ...........................................................................................22
Model 5250 Series Power Supply Module .......................................................................................................22
Model 5502 6U Alarm Interface Module ........................................................................................................22
3 Installation checklist ..................................................................................................................................... 23
6U quick set-up checklist.......................................................................................................................................24
4 System Architecture....................................................................................................................................... 25
CompactPCI form factor.......................................................................................................................................26
Board front panels ...........................................................................................................................................27
Transition Boards ...........................................................................................................................................27
Pin and socket connectors......................................................................................................................................29
J1/P1 & J2/P2 connectors ...............................................................................................................................31
J3/P3 through J5/P5 connector .......................................................................................................................32
Reserved Pins ..................................................................................................................................................32
Power Pins ......................................................................................................................................................32
Backplane Architecture..........................................................................................................................................33
Signaling Environment ...................................................................................................................................34
Changing the signaling environment voltage .............................................................................................34
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Contents
600 Series 6U CPCI Chassis User Manual
Slot Designation .............................................................................................................................................36
Bus segments .............................................................................................................................................37
Backplane signals ............................................................................................................................................38
Alarms ............................................................................................................................................................39
Backplane power distribution ................................................................................................................................41
External power connections ............................................................................................................................42
Backplane power bugs and connectors .......................................................................................................43
In-rack power connections ..............................................................................................................................44
Front panel keying for power supplies .............................................................................................................46
Power decoupling ...........................................................................................................................................46
Hot-Swap Capability.............................................................................................................................................46
Hot-Swap Insertion Sequence .........................................................................................................................47
Hot-swap removal sequence ............................................................................................................................47
Keying of CPCI backplanes and boards .................................................................................................................48
Backplane connector keys ...............................................................................................................................48
Front panel and cardguide keys .......................................................................................................................49
5 CT H.110 Bus Architecture........................................................................................................................... 51
CT H.110 Bus ......................................................................................................................................................52
H.110 TDM bus P4 pins ...............................................................................................................................53
Telecom power bus P4 pins ............................................................................................................................53
Telecom ringing bus P4 pins ...........................................................................................................................54
Platform power bus P4 pins ............................................................................................................................54
Shelf enumeration bus P4 pins ........................................................................................................................54
Geographic address P4 pins .............................................................................................................................56
Reserved pins on P4 ........................................................................................................................................56
Frame ground bus P4 pins ..............................................................................................................................56
Not populated pins and pads on P4 ................................................................................................................56
Power fail sense bus pins on P4 .......................................................................................................................57
Key electrical considerations ............................................................................................................................58
User-defined CT I/O on P5 ..................................................................................................................................58
6 Maintenance.................................................................................................................................................. 61
Troubleshooting....................................................................................................................................................62
System won’t power up ...................................................................................................................................62
Hot-swap of power supply fails .......................................................................................................................62
No-load condition generates a false alarm .......................................................................................................62
Warranty Information ...........................................................................................................................................62
Service ...................................................................................................................................................................62
A Glossary of Terms ......................................................................................................................................... 65
C ...........................................................................................................................................................................66
CFM ...............................................................................................................................................................66
CSA ................................................................................................................................................................66
CT ..................................................................................................................................................................66
D...........................................................................................................................................................................66
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600 Series 6U CPCI Chassis User Manual
Dual Redundant .............................................................................................................................................66
E............................................................................................................................................................................66
ECTF .............................................................................................................................................................66
EIA .................................................................................................................................................................66
EMC ...............................................................................................................................................................66
EMI ................................................................................................................................................................66
EN ..................................................................................................................................................................66
Enumeration ...................................................................................................................................................66
ESD ................................................................................................................................................................66
Eurocard .........................................................................................................................................................66
H...........................................................................................................................................................................66
Hot-Swap .......................................................................................................................................................66
HP ..................................................................................................................................................................66
I.............................................................................................................................................................................67
IDE ................................................................................................................................................................67
IEC .................................................................................................................................................................67
IEEE ...............................................................................................................................................................67
IN/C ...............................................................................................................................................................67
ISA ..................................................................................................................................................................67
K ...........................................................................................................................................................................67
Keying ............................................................................................................................................................67
N...........................................................................................................................................................................67
N+1 Redundant ..............................................................................................................................................67
NEBS .............................................................................................................................................................67
NP ..................................................................................................................................................................67
P............................................................................................................................................................................67
PCI .................................................................................................................................................................67
PCI SIG ..........................................................................................................................................................67
PICMG ..........................................................................................................................................................67
Platform ..........................................................................................................................................................67
S............................................................................................................................................................................67
SELV ..............................................................................................................................................................67
S-HAZ ............................................................................................................................................................67
Shroud ............................................................................................................................................................68
T ...........................................................................................................................................................................68
TDM ..............................................................................................................................................................68
TNV ...............................................................................................................................................................68
U...........................................................................................................................................................................68
U ....................................................................................................................................................................68
W ..........................................................................................................................................................................68
Warm-Swap ....................................................................................................................................................68
Contents
6
Contents
600 Series 6U CPCI Chassis User Manual
About this guide
This manual is a comprehensive hardware reference tool for the Patton Electronics 6U CPCI Redundant Backplane/Midplane and Chassis line of products.
Audience
This guide is intended for the following users:
• System developers installing and integrating the products into their systems
• Operators
• Installers
• Maintenance technicians
Structure
This guide contains the following chapters and appendices:
• Chapter 1, “Introduction”—provides an overview of the product, about Patton Electronics, warranty, and
service information.
• Chapter 2, “Chassis specifications”—provides an overview of the chassis features.
• Chapter 3, “Installation checklist”—provides a quick set-up checklist for installing the Model 600.
• Chapter 4, “System Architecture”—provides an overview of CompactPCI specifications, as well as a more
in-depth description of the product’s features.
• Chapter 5, “CT H.110 Bus Architecture”—defines the CT Bus configured on the J4/P4 connector, when
applicable.
• Chapter 6, “Maintenance”—provides a quick set-up checklist, tips for troubleshooting, warranty informa-
tion, and where to get help.
• Appendix A, “Glossary of Terms”—defines terms and acronyms used in this document.
For best results, read the contents of this guide before you install the enclosure.
7
8
About this guide
600 Series 6U CPCI Chassis User Manual
Precautions
Notes and cautions, which have the following meanings, are used throughout this guide to help you become
aware of potential problems. Warnings relate to personal injury issues, and Cautions refer to potential property
damage.
Note
Calls attention to additional or noteworthy information or tips.
The shock hazard symbol and WARNING heading indicate a potential electric
shock hazard. Strictly follow the warning instructions to avoid injury caused
by electric shock.
The alert symbol and WARNING heading indicate a potential safety hazard.
Strictly follow the warning instructions to avoid personal injury.
The shock hazard symbol and CAUTION heading indicate a
potential electric shock hazard. Strictly follow the instructions to
avoid property damage caused by electric shock.
The alert symbol and CAUTION heading indicate a potential hazard. Strictly follow the instructions to avoid property damage.
This symbol and the CAUTION heading indicates a situation
where damage to equipment can be caused by electrostatic discharge.
.
This symbol and the IMPORTANT heading provides information
which should be followed for best results when installing, configuring, or operating the Patton product.
Style conventions used in this document
Tables contain information of a descriptive nature. For example, pin assignments or signal description.
Cross-references, figure titles, and table titles are in italicized and hyperlinked. This means that if you have the
on-line version of this document, you can click on the cross-reference and it will “jump” you to that reference
within the document. This feature only works with references to sections/tables/figures within this document.
References to other documents (for example, PICMG 2.5 R1.0 CompactPCI Computer Telephony Specification )
are not hyperlinked.
The symbols “/” and “#” indicate signals that are active low.
Specific safety-related terms, traceable to certain safety regulatory agency requirements (i.e., IEC950 and harmonized derivative specifications) are used within this manual. Refer to the referenced document for a definition of these terms.
Precautions
9
600 Series 6U CPCI Chassis User Manual
Typographical conventions used in this document
This section describes the typographical conventions and terms used in this guide.
General conventions
The procedures described in this manual use the following text conventions:
Table 1. General conventions
Convention
Futura bold type
Italicized Futura type
Futura type
Garamond bold type
< >
Are you ready?
% dir *.*
Indicates the names of menu bar options.
Indicates the names of options on pull-down menus.
Indicates the names of fields or windows.
Indicates the names of command buttons that execute an action.
Angle brackets indicate function and keyboard keys, such as <SHIFT>,
<CTRL>, <C>, and so on.
All system messages and prompts appear in the Courier font as the
system would display them.
Bold Courier font indicates where the operator must type a response or
command
Meaning
About this guide
Mouse conventions
The following conventions are used when describing mouse actions:
Table 2. Mouse conventions
Convention Meaning
Left mouse button
Right mouse button This button refers the secondary or rightmost mouse button (unless you have
Point This word means to move the mouse in such a way that the tip of the pointing
Click Means to quickly press and release the left or right mouse button (as instructed in
Double-click Means to press and release the same mouse button two times quickly
Drag This word means to point the arrow and then hold down the left or right mouse but-
This button refers to the primary or leftmost mouse button (unless you have
changed the default configuration).
changed the default configuration).
arrow on the screen ends up resting at the desired location.
the procedure). Make sure you do not move the mouse pointer while clicking a
mouse button.
ton (as instructed in the procedure) as you move the mouse to a new location.
When you have moved the mouse pointer to the desired location, you can release
the mouse button.
Typographical conventions used in this document
10
About this guide
600 Series 6U CPCI Chassis User Manual
Bibliography
The following publications are used in conjunction with this manual.
• ECTF H.110 (CT Bus) Specification (Revision 1.0)
• CompactPCI Hot Swap Specification—PICMG 2.12 (Revision 1.0)
• CompactPCI Specification—PICMG 2.0 (Revision 2.1)
• Keying of CompactPCI Boards and Backplanes Specification—PICMG 2.10 (Revision 1.0)
• IEC950, Safety of Information Technology Equipment, including Electrical Business Equipment
• IEC 61076-4-101 (1995-05), Specification for 2mm Connector System
• IEEE 1101.10, IEEE Standard for Additional Mechanical Specifications for Microcomputers using IEEE
1101.1 Equipment Practice
Bibliography
Chapter 1
Chapter contents
Product features and benefits.................................................................................................................................12
What is CompactPCI?...........................................................................................................................................12
About Patton Electronics Company ......................................................................................................................13
Introduction
11
12
1 • Introduction
600 Series 6U CPCI Chassis User Manual
Product features and benefits
Thank you for purchasing the Patton Electronics 600 Series 6U CPCI Redundant Backplane/Midplane and
Chassis. The 600 Series chassis is a 21-slot redundant system. The backplane/midplane provides two, electrically separate, 8-slot CPCI bus segments on P1/P2. It also provides a 17-slot common H.110 bus on P4.
The backplane/midplane is configured to accept four Patton Electronics 3U plug-in supplies for N+1 power
redundancy. The system can provide 600 W of online power, with one 200 W hot standby unit for fault tolerant operation. The backplane/midplane supports all feed-through with rear A/B shrouds on RP3, RP4, and
RP5, and the 14 layer design provides excellent power distribution and signal integrity.
The 600 Series chassis complies with the PICMG 2.0 R3.0 CompactPCI Specification , and PICMG 2.5, ECTF
H.110 (CT Bus) Specification (Rev. 1.0), making it an excellent choice for redundant, fault tolerant applications
What is CompactPCI?
CompactPCI (Peripheral Component Interconnect) is a high-performance industrial computer platform based
on the standard PCI electrical specification in rugged 3U or 6U Eurocard-style packaging, with a high-quality
2mm metric pin and socket connector.
CompactPCI is an open specification supported by the PICMG (PCI Industrial Computer Manufacturers Group), which is a consortium of companies involved in utilizing PCI for embedded
applications.
Distinct advantages of CompactPCI (“CPCI”) include:
• Cost/time savings—Because it is electrically compatible with PCI, CPCI allows designers to tap into the
wealth of available hardware and software. CPCI provides a substantial reduction in engineering and manufacturing costs because off-the-shelf items can be shipped to meet your configuration needs and delivery
schedules.
• Rugged and reliable—The Eurocard-style packaging—which includes two-piece shielded connectors for
better reliability and vertical card orientation for better cooling—provides a robust system based on a subrack backplane architecture.
• Flexibility—CPCI allows either 32- or 64-bit PCI, plus offers an open architecture. Additional connectors
are defined for adding standard or proprietary buses or other needs. Hybrid CPCI systems allow bridging to
other buses or custom applications.
• Hot-swap capability—Boards can be hot-swapped without disrupting operation, a critical feature in real-
time and high-availability applications.
CompactPCI is rapidly becoming the backbone of today’s high-performance, embedded systems. It is ideally
suited for telecommunications, computer telephony, real-time machine control, industrial automation, realtime data acquisition, instrumentation, military systems and other applications requiring high speed computing and modular, robust packaging design.
Product features and benefits
13
600 Series 6U CPCI Chassis User Manual
1 • Introduction
About Patton Electronics Company
Patton Electronics excels in the design, development and production of Embedded Data Communications and
Telecommunications Platforms based on open system bus architecture standards (for example, CPCI and
VME). These platforms form a significant part of the infrastructure for today’s information technology revolution—including the emergence of new packet-based (IP) global communication networks.
Datacom/Telecom platforms require robust and reliable packaging solutions that address key technology issues,
such as line density, thermal management, power distribution, scalability, and regulatory compliance. With an
increasing number of applications demanding downtime measured in minutes rather than hours, special consideration has to be given to enclosure system functionality. Patton Electronics’ full line of enclosure solutions
are designed specifically to meet industry’s stringent high availability requirements where redundant operation,
quick accessibility and high reliability are essential. Patton has a broad engineering background in the development of these technologies for advanced circuit and packet-switched telecommunications systems running
voice, data and video applications for commercial and government customers.
Patton offers a wide range of platforms consisting of standard rack/chassis, high speed backplane, power, thermal management, single board computer (SBC) and alarm/network interface products for commercial, voice/data communications, and government/military system
applications. Patton Electronics is ISO-9001 Certified.
About Patton Electronics Company
14
1 • Introduction
600 Series 6U CPCI Chassis User Manual
About Patton Electronics Company 15
Chapter 2
Chapter contents
6U CPCI subrack..................................................................................................................................................16
Chassis description, front side................................................................................................................................17
Chassis description, rear side..................................................................................................................................18
Electromagnetic compatibility (EMC)...................................................................................................................19
Electrostatic discharge (ESD) protection................................................................................................................20
Materials specifications—Models 601 and 602 chassis...........................................................................................21
Patton Electronics’ product interfaces....................................................................................................................22
Model 5406 6U Redundant Backplane/Midplane ...........................................................................................22
Model 5250 Series Power Supply Module .......................................................................................................22
Model 5502 6U Alarm Interface Module ........................................................................................................22
Chassis specifications
✔
✔
✔
✔
16
✔
2 • Chassis specifications
600 Series 6U CPCI Chassis User Manual
6U CPCI subrack
The 600 Series chassis are modular 6U x 19 inch rackmount subrack-type packaging systems suitable
for open bus architectures such as CPCI, or custom bus applications. The rugged, rack-mounted 6U
CPCI chassis is ideal for telecom, defense, industrial, and commercial environments, and excels in its
ease of access, superior cooling, and power distribution. The base unit is adaptable to a wide array of
product configurations.
This chapter details the Model 601 6U chassis with 80mm transition module section. The Model 602
does not have the transition module section, making it only 7.25 inches in maximum depth. A listing
of the differences between Models 601 and 602 is provided in section “Materials specifications—Models 601 and 602 chassis” on page 21.
Product features include:
Full dimensional compatibility with CompactPCI (PICMG 2.0 R3.0) and IEEE-1101.10.
EMI shielding on entire assembly, with continuous chassis ground.
Lightweight and durable aluminum construction, suitable for rugged environments.
Five standard colors (additional colors are also available). Standard powder coating finish.
Front mounting flanges for 19 in. rack mount environments.
Chassis description, front side
The Model 601, CPCI 6U chassis is 10.50 inches high, by 19 inches wide (standard EIA rack mount, with
removable rack mount flanges), by 12 inches deep (maximum). There are sixteen 6U x 160mm slots, (see
6U CPCI subrack
17
600 Series 6U CPCI Chassis User Manual
2 • Chassis specifications
figure 1) providing two, electrically separate, CPCI bus segments, at the front of the chassis. Front-entry
boards, in accordance with PICMG 2.0 R3.0 CompactPCI specifications, are plugged-in at these slots.
Figure 1. Front view of the Model 601 6U CPCI chassis
The front of the chassis also provides four 3U x 160mm slots to mount up to four Patton power supply modules configured for external DC input, or other CPCI compatible power modules for N+1 power redundancy.
The system can provide 600 W of online power, with one 200 W hot standby unit for fault tolerant operation.
Note The chassis guide rails are 1/2HP offset for plug-able power supplies
to meet the standards of PICMG 2.11, R1.0 CompactPCI Power Interface “Draft” Specification. That is to say, the card guide’s slot and injec-
tor/ejector PCB mounting surface are shifted 0.1 inch to the right of
the card. Card guides are green in color.
All slots provide 4HP module spacing and are on 0.80 in. centers (except for the power connector slots noted
above). Card guides are molded plastic with metallic ESD contacts at the bottom of the chassis (see section
“Electrostatic discharge (ESD) protection” on page 19) per CompactPCI PICMG 2.0 R3.0 & IEEE 1101.10.
Cardguides provide keying and alignment in accordance with IEEE 1101.10, section 8. See “Keying of CPCI
backplanes and boards” on page 48 for more information on keying.
Chassis description, front side
2 • Chassis specifications 600 Series 6U CPCI Chassis User Manual
Chassis description, rear side
The rear of the Model 601 chassis provides seventeen 6U x 80mm slots for an Alarm card and/or other CPCI
transition modules for rear-panel I/O (see figure 2). See “Transition Boards” on page 27 for more information.
Figure 2. Rear view of the Model 601 6U CPCI chassis
All slots provide 4HP module spacing and are on 0.80 in. centers. Card guides are molded plastic with metallic
ESD contacts at the bottom of the chassis (See “Electrostatic discharge (ESD) protection” on page 19) per
CompactPCI PICMG 2.0 R3.0 & IEEE 1101.10. Cardguides provide keying and alignment in accordance with
IEEE 1101.10, section 8. See “Keying of CPCI backplanes and boards” on page 48 for more information on
keying.
Note See Table 8 on page 42 for more information on the connectors
Electromagnetic compatibility (EMC)
The 6U Model 601 is an EMC chassis, which reduces the disturbances from EMI as follows:
• All gaskets, contacts, and contact surfaces are electrically conductive
• The mating surfaces of the EMC chassis and the EMC plug-in unit front panels and/or optional EMC filler
panels are also conductive by use of gaskets/strips
• All chassis and plug-in contact surfaces are connected to a common chassis ground
18 Chassis description, rear side
600 Series 6U CPCI Chassis User Manual 2 • Chassis specifications
Mating EMC gaskets and strips are used on the chassis, front panels of boards, and optional filler panels. An
EMC gasket is attached to the left of the chassis (front view), and an EMC strip is attached to the right. Plugin boards have the corresponding mates on the opposite side (see figure 3).
Figure 3. EMC strip and gasket on chassis and cards
The EMC strip on the left side of the board mates with the EMC gasket attached to the chassis when it is
plugged into the first slot. Each board mates together with corresponding gaskets/strips.
Note EMC gaskets/strips are in reverse order at the rear of the 6U chassis.
That is, the EMC strip is on the left of the chassis and the EMC gasket is on the right. Consequently, rear transition boards are likewise
in reverse order to the front-entry boards. The EMC gasket is on the
left, and the EMC strip is on the right.
In addition, all aluminum and steel components of the subrack are surface treated and conductive. Top, bottom, sides and rear EMC covers provide mechanical protection and EMC shielding on the subrack. Retaining
clips ensure conductive connection.
Electrostatic discharge (ESD) protection
The 6U chassis provides ESD protection in compliance with IEEE 1101.10.
ESD contacts are embedded inside and in the front section of card guides for making early as possible contact
with a discharge strip on one or both, the upper and/or lower edge of the plug-in board/module. Only the card
Electrostatic discharge (ESD) protection 19
2 • Chassis specifications 600 Series 6U CPCI Chassis User Manual
guides located at the bottom rail of the chassis, both front and rear (when there is a transition module present
in the chassis), contain the ESD clips. The ESD clip in the card guide is connected to the Chassis GND
(ground).
There is an alignment/ESD pin on the injector/ejector handle of boards (see figure 4).
Card handle
Alignment/ESD pin
Figure 4. Alignment/ESD pin on card handle
The alignment pin does the following:
• Ensures that the connectors are correctly aligned before they engage
• Provides solid/protected keying
• Provides board ESD contact
• Ensures that the EMC gasket is properly aligned (see “Electromagnetic compatibility (EMC)” on page 18)
• Ensures that when the board is inserted in the card guide, an integrated ESD clip discharges ESD from the
board to the right vertical rail chassis ground.
20 Electrostatic discharge (ESD) protection
600 Series 6U CPCI Chassis User Manual 2 • Chassis specifications
Materials specifications—Models 601 and 602 chassis
A list of the 6U model 601 chassis materials specifications is provided in table 3. A list of the model 602 chassis
(which does not have a transition module) materials specifications is provided in table 4.
Table 3. 6U Model 601 chassis materials specifications
Item Description
Physical
DC interface Rear DC interface panel includes dual ground bugs, –48V DC power
Slot configuration 21 slots (maximum) are on 0.80 in. centers, except power slots are
module keying and alignment 4HP module spacing, cardguide provides for keying and alignment
Card guides Molded plastic with snap-in ESD contacts for both plug-in module and
Plug-in unit injector/ejector handles Subrack dimensional format accepts modules with injector/ejector han-
6U chassis part no. 60-00001
6U model no. 6001
• Height–6U (10.50 in.)
• Width–19 in. (standard EIA rack mount)
• Depth–12 in. maximum
interface for N+1 redundant power operation, and connectors for
VRG, VRGRTN, -SEL VBAT and SEL VBATRTN.
1.6 in. center
• Front—6U x 160 mm slots, Qty: 17
• REAR—6U x 80 mm slots, Qty: 17
pin in accordance with IEEE 1101.10, Section 6
injector/ejector handle alignment pin
dles as specified in IEEE 1101.10, Section 8
The Model 602 chassis materials specifications are identical to Model 601 shown above, with the following differences noted in table 4.
Table 4. 6U Model 602 chassis materials specifications
Item Description
Physical
• Height–6U (10.50 in.)
• Width–19 in. (standard EIA rack mount)
• Depth–7.25 in. maximum
Slot configuration 21 slots (maximum) are on 0.80 in. centers, except power slots are
1.6 in. center. 17 slots are available when the Model 600 is config-
ures with the 3U power supplies
6U chassis part no. 60-00002
6U model no. 602
Materials specifications—Models 601 and 602 chassis 21
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