IEEE Std 1101.11-1998 IEEE Standard for Mechanical Rear ... IEEE Std 1101.11-1998 IEEE Std...

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IEEE Std 1101.11-1998 IEEE Std 1101.11-1998 IEEE Standard for Mechanical Rear Plug-in Units Specications for Microcomputers Using IEEE 1101.1 and IEEE 1101.10 Equipment Practice IEEE Computer Society Sponsored by the Bus Architecture Standards Committee 30 June 1998 SH94609

Transcript of IEEE Std 1101.11-1998 IEEE Standard for Mechanical Rear ... IEEE Std 1101.11-1998 IEEE Std...

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IEEE Std 1101.11-1998

IEEE Std 1101.11-1998

IEEE Standard for Mechanical Rear Plug-in Units SpeciÞcations for Microcomputers Using IEEE 1101.1 and IEEE 1101.10 Equipment Practice

IEEE Computer Society

Sponsored by the Bus Architecture Standards Committee

30 June 1998 SH94609

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To order IEEE standardsÉ

Call 1. 800. 678. IEEE (4333) in the US and Canada.

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ISBN 0-7381-0179-6

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The Institute of Electrical and Electronics Engineers, Inc.345 East 47th Street, New York, NY 10017-2394, USA

Copyright © 1998 by the Institute of Electrical and Electronics Engineers, Inc.All rights reserved. Published 1998. Printed in the United States of America.

ISBN 0-7381-0179-6

No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.

IEEE Std 1101.11-1998

IEEE Standard for Mechanical Rear Plug-in Units SpeciÞcations for Microcomputers Using IEEE 1101.1 and IEEE 1101.10 Equipment Practice

Sponsor

Bus Architecture Standards Committeeof theIEEE Computer Society

Approved 21 May 1998

IEEE-SA Standards Board

Abstract:

Additional dimensions that will ensure mechanical interchangeability of subracks andplug-in units based on IEEE P1101.1 (D1.0, 1997), IEEE Std 1101.10-1996, and the environmentalrequirements of IEC 61587-1 (May 1998-Draft) and IEC 61587-3 (May 1998-Draft) are specified.

Keywords:

backplane, compatibility, connector, inline configuration, inspection dimension, plug-inunit, printed board, shroud, subrack

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IEEE Standards

documents are developed within the IEEE Societies and the Standards Coordinat-ing Committees of the IEEE Standards Association (IEEE-SA) Standards Board. Members of thecommittees serve voluntarily and without compensation. They are not necessarily members of theInstitute. The standards developed within IEEE represent a consensus of the broad expertise on thesubject within the Institute as well as those activities outside of IEEE that have expressed an inter-est in participating in the development of the standard.

Use of an IEEE Standard is wholly voluntary. The existence of an IEEE Standard does not implythat there are no other ways to produce, test, measure, purchase, market, or provide other goods andservices related to the scope of the IEEE Standard. Furthermore, the viewpoint expressed at thetime a standard is approved and issued is subject to change brought about through developments inthe state of the art and comments received from users of the standard. Every IEEE Standard is sub-jected to review at least every Þve years for revision or reafÞrmation. When a document is morethan Þve years old and has not been reafÞrmed, it is reasonable to conclude that its contents,although still of some value, do not wholly reßect the present state of the art. Users are cautioned tocheck to determine that they have the latest edition of any IEEE Standard.

Comments for revision of IEEE Standards are welcome from any interested party, regardless ofmembership afÞliation with IEEE. Suggestions for changes in documents should be in the form of aproposed change of text, together with appropriate supporting comments.

Interpretations: Occasionally questions may arise regarding the meaning of portions of standards asthey relate to speciÞc applications. When the need for interpretations is brought to the attention ofIEEE, the Institute will initiate action to prepare appropriate responses. Since IEEE Standards rep-resent a consensus of all concerned interests, it is important to ensure that any interpretation hasalso received the concurrence of a balance of interests. For this reason, IEEE and the members of itssocieties and Standards Coordinating Committees are not able to provide an instant response tointerpretation requests except in those cases where the matter has previously received formalconsideration.

Comments on standards and requests for interpretations should be addressed to:

Secretary, IEEE-SA Standards Board445 Hoes LaneP.O. Box 1331Piscataway, NJ 08855-1331USA

Authorization to photocopy portions of any individual standard for internal or personal use isgranted by the Institute of Electrical and Electronics Engineers, Inc., provided that the appropriatefee is paid to Copyright Clearance Center. To arrange for payment of licensing fee, please contactCopyright Clearance Center, Customer Service, 222 Rosewood Drive, Danvers, MA 01923 USA;(978) 750-8400. Permission to photocopy portions of any individual standard for educational class-room use can also be obtained through the Copyright Clearance Center.

Note: Attention is called to the possibility that implementation of this standard mayrequire use of subject matter covered by patent rights. By publication of this standard,no position is taken with respect to the existence or validity of any patent rights inconnection therewith. The IEEE shall not be responsible for identifying patents forwhich a license may be required by an IEEE standard or for conducting inquiries intothe legal validity or scope of those patents that are brought to its attention.

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Copyright © 1998 IEEE. All rights reserved.

iii

Introduction

(This introduction is not part of IEEE Std 1101.11-1998, IEEE Standard for Mechanical Rear Plug-in Units SpeciÞca-tions for Microcomputers Using IEEE 1101.1 and IEEE 1101.10 Equipment Practice.)

Despite the push for metriÞcation, the ÒEuroboardÓ (19 in based) continues to be the leading choice for theindustrial mechanical equipment practice, and is accepted throughout the world for all kinds of electronicsapplications. Among these are all major bus architectures, such as VME, CompactPCI

¨

, etc.

This is why the Computer SocietyÕs Technical Committee on Microcomputers and Microprocessors found itappropriate to create an IEEE standard which further expands upon IEEE P1101.1 (D1.0, 1997) and the IEC60297-... series of standards, ÒDimensions of Mechanical Structures of the 482.6 mm (19 in) Series,Ó [IEC60297-3 (1984-01) and IEC 60297-4 (1995-03)] for rear plug-in units.

This standard is an extension of IEEE P1101.1 (D1.0, 1997) and IEEE Std 1101.10-1996 (submitted to theIEC) and deÞnes the mechanical rear plug-in unit sizes and interface details.

At the time this standard was completed, the P1101.11 Working Group had the following membership:

Eike Waltz,

Chair

Frank Hom,

Secretary

The following persons were on the balloting committee:

Ralf BehrensPaul DenommeRobert W. DowningJean-Jacque DumontWayne P. Fischer

Tad KubicPaul MazuraDavid MoorePeter G. OdellGunter Pape

Elwood T. ParsonsHolly SherÞnskiMichael G. ThompsonSue WongDavid L. Wright

Ghassan A. AbbasMalcolm J. AirstRay S. AldermanHarry A. AndreasKeith D. AnthonyEdmund H. BaulsirMartin BlakeRalf BokaemperDavid BrearleyCharles BrillC. H. Chen

Robert W. DowningJean-Jacque DumontWayne P. FischerKenneth C. HeckRoger HinsdaleFrank HomConrad A. LaurvickGerald E. LawsRollins LinserGary S. ManchesterJoseph R. MarshallThanos Mentzelopoulos

Gene E. MilliganKlaus-Dieter MuellerMichael MunroeJoe P. NorrisPeter G. OdellElwood T. ParsonsHermann H. StrassMichael G. ThompsonRobert C. TripiBruce WallaceDavid L. Wright

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iv

Copyright © 1998 IEEE. All rights reserved.

The Þnal conditions for approval of this standard were met on 21 May 1998. This standard was conditionallyapproved by the IEEE-SA Standards Board on 19 March 1998, with the following membership:

Richard J. Holleman,

Chair

Donald N. Heirman,

Vice Chair

Judith Gorman,

Secretary

*Member Emeritus

Catherine K.N. Berger

IEEE Standards Project Editor

CompactPCI is a registered trademark of the PCI Industrial Computer Manufacturers Group.

Satish K. AggarwalClyde R. CampJames T. CarloGary R. EngmannHarold E. EpsteinJay Forster*Thomas F. GarrityRuben D. Garzon

James H. GurneyJim D. IsaakLowell G. JohnsonRobert KennellyE. G. ÒAlÓ KienerJoseph L. KoepÞnger*Stephen R. LambertJim LogothetisDonald C. Loughry

L. Bruce McClungLouis-Fran�ois PauRonald C. PetersenGerald H. PetersonJohn B. PoseyGary S. RobinsonHans E. WeinrichDonald W. Zipse

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Copyright © 1998 IEEE. All rights reserved.

v

Contents

1. Overview.............................................................................................................................................. 1

1.1 Scope............................................................................................................................................ 11.2 Purpose......................................................................................................................................... 2

2. References............................................................................................................................................ 2

3. Terminology......................................................................................................................................... 3

3.1 Abbreviations............................................................................................................................... 33.2 Special word usage ...................................................................................................................... 3

4. General arrangement............................................................................................................................ 4

5. Relationships of front and rear plug-in units ....................................................................................... 5

5.1 The in-line configuration, non-EMC and EMC........................................................................... 5

6. Rear mounted plug-in unit printed board (Euroboard) sizes ............................................................... 6

6.1 Board height................................................................................................................................. 76.2 Board depth.................................................................................................................................. 76.3 Rear mounted plug-in unit inspection dimensions....................................................................... 7

7. Connector orientation, pin labeling, and printed board component view............................................ 9

8. Subrack rear attachment plane ........................................................................................................... 10

9. Rear backplane mounted plug-in unit fixed connector relationship .................................................. 11

10. Rear subrack connector (backplane mounted) shroud orientation..................................................... 12

10.1 Connector shroud orientation..................................................................................................... 12

11. Backplane bow and support ............................................................................................................... 12

12. Connector performance...................................................................................................................... 13

13. Connector alignment.......................................................................................................................... 13

14. Rear mounted plug-in unit cooling consideration.............................................................................. 13

15. Front and rear plug-in unit front panel protective ground ................................................................. 13

15.1 Mechanical design ..................................................................................................................... 1315.2 Requirement............................................................................................................................... 1315.3 Resistance .................................................................................................................................. 1315.4 Minimum galvanic compatibility and contact operations.......................................................... 1415.5 Pass criteria ................................................................................................................................ 14

Annex A (normative) Inspection Dimensions for Subracks and Associated Plug-in Units inAccordance with IEEE 1101.1, IEEE 1101.10 and IEEE Draft P1101.11 Using theIEC 61076-4-101 Connector Series ............................................................................................. 15

Annex B (informative) Bibliography .......................................................................................................... 21

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Copyright © 1998 IEEE. All rights reserved.

1

IEEE Standard for Mechanical Rear Plug-in Units SpeciÞcations for Microcomputers Using IEEE 1101.1 and IEEE 1101.10 Equipment Practice

1. Overview

1.1 Scope

This standard may be applied in all Þelds of electronics where equipment and installations are required toconform to the 482.6 mm (19 in) equipment practice [based on IEEE P1101.1 (D1.0, 1997),

1

IEEE Std1101.10-1996, IEC 60297-3 (1984-01) [B4]

2

, and IEC 60297-4 (1995-03) [B5]] for mounting in equipmentaccording to ANSI/EIA 310-D-1992 [B1] and IEC 60297-1 (1986-01) [B3] (see Figure 1). This standardcovers subracks equipped with front mounted plug-in units in accordance with IEEE P1101.1 (D1.0, 1997)and IEEE Std 1101.10-1996, and provides for additional rear mounted plug-in units in the same subrack.

This standard permits other suitable IEC connector-related dimensions to be added (see Annex A).

1.1.1 Dimensions of printed boards

This standard covers an additional range of printed board (PB) sizes suitable for subrack rear mounted plug-in units [based on IEEE P1101.1 (D1.0, 1997), IEEE Std 1101.10-1996, IEC 60297-3 (1984-01) [B4], andIEC 60297-4 (1995-03) [B5]] for mounting in equipment according to ANSI/EIA 310-D-1992 [B1] and IEC60297-1 (1986-09) [B3].

1.1.2 Dimensions of subracks

This standard covers additional dimensions, according to IEEE P1101.1 (D1.0, 1997) and IEEE Std1101.10-1996, for subracks with rear mounted plug-in units.

1.1.3 Dimensions of backplanes

This standard covers limits of backplane thickness, according to IEEE P1101.1 (D1.0, 1997) and IEEE Std1101.10-1996, when installed in subracks with rear mounted plug-in units.

1

Information on references can be found in Clause 2.

2

The numbers in brackets preceded by the letter B correspond to those of the bibliography in Annex B.

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IEEEStd 1101.11-1998 IEEE STANDARD FOR MECHANICAL REAR PLUG-IN UNITS SPECIFICATIONS FOR

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1.1.4 Choice of connectors

This standard refers only to connectors in accordance with IEC 60603-2 (1995-09) [B6] and as referenced inIEEE P1101.1 (D1.0, 1997) and IEEE Std 1101.10-1996. Other IEC connectors may be used by themselvesor mixed with IEC 60603-2 connectors. This standard deÞnes inspection dimensions required for IEC60603-2 and IEC 61076-4-1xx connectors. Inspection dimensions for the IEC 61076-4-101 series of con-nectors may be found in Annex A. This standard also deÞnes the difference between a front plug-in unit con-nector and a rear plug-in unit connector (see Figure 6).

1.1.5 Rear connector shrouds

This standard deÞnes the dimensions of compatible connector shrouds.

1.1.6 Front and rear plug-in unit front panel protective ground

This standard deÞnes mechanical interface and electrical test requirements for input/output (I/O) plug-in unitprotective ground protection with reference to IEC 60950 (1991-10) [B8].

1.2 Purpose

The purpose of this standard is to specify additional dimensions that, when followed, will ensure mechanicalinterchangeability of subracks and plug-in units based on IEEE Std 1101.10-1996 and the environmentalrequirements of IEC 61587-1 (May 1998-Draft) and IEC 61587-3 (May 1998-Draft).

NOTEÑIEEE P1101.1 (D1.0, 1997), IEC 60297-3 (1984-01), and IEC 60297-4 (1995-03) subrack systems not comply-ing with these additional standard requirements have limited compatibility.

2. References

This standard shall be used in conjunction with the following publications. When they are superseded by anapproved revision, the revision shall apply.

The users of this standard are required to be familiar with IEEE P1101.1 (D1.0, 1997) and IEEE Std1101.10-1996.

IEC 61587-1 (May 1998-Draft), Climatic, mechanical tests and safety aspects for racks, subracks for theIEC 60917-...and IEC 60297-... Series.

3

IEC 61587-3 (May 1998-Draft), Electromagnetic shielding performance tests for cabinets, racks and sub-racks for the IEC 60917-... and 60297-...Series.

IEEE P1101.1 (D1.0, 1997), DRAFT Standard for Mechanical Core SpeciÞcation for MicrocomputersUsing IEC (60)603.2 Connectors.

4

IEEE Std 1101.10-1996, IEEE Standard for Additional Mechanical SpeciÞcations for MicrocomputersUsing the IEEE 1101.1-1991 Equipment Practice.

5

3

IEC publications are available from IEC Sales Department, Case Postale 131, 3, rue de Varemb�, CH-1211, Gen�ve 20, Switzerland/Suisse. IEC publications are also available in the United States from the Sales Department, American National Standards Institute, 11West 42nd Street, 13th Floor, New York, NY 10036, USA.

4

This IEEE standards project was not approved by the IEEE Standards Board at the time this publication went to press. For informationabout obtaining a draft, contact the IEEE.

5

IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, P.O. Box 1331, Piscataway,NJ 08855-1331, USA.

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3. Terminology

3.1 Abbreviations and acronyms

Da dimension between front panel mounting hole and connector mounting holeDb printed board depth dimensionDc inspection dimension for subrack front mounted PiUsDg dimension between front panel mounting hole and rear end solder side cover mounting holesDT 2 inspection dimension of plug-in unit assemblyEMC electromagnetic compatibilityFSC Þxed subrack connectorHP horizontal pitch of 5.08 mmI/O input/outputPB printed boardPFC plug-in unit free connectorPiU plug-in unitRDc inspection dimension for subrack rear mounted PiUsRDx inspection dimension for shroud positioningRFC rear free connectorRSC rear subrack connector (backplane mounted)U subrack height measured in units of 44.45 mm (1.75 in)

3.2 Special word usage

may:

A keyword indicating ßexibility of choice with no implied preference.

shall:

A keyword indicating a mandatory requirement.

should:

A keyword indicating ßexibility of choice with a strongly preferred implementation.

complementary:

A keyword indicating that there is no standard as yet deÞned; however, the product is indesign or is available. Although the product relates to the referred standard, it may differ or expand mechan-ically and/or electrically in certain areas of the standard.

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4. General arrangement

Generally, subracks featuring rear plug-in units are also equipped with front plug-in units and/or Þller panelsin accordance with IEEE P1101.1 (D1.0, 1997) and IEEE Std 1101.10-1996. The front and rear plug-in unitPBs are Òin-line,Ó meaning that there is no offset between the front and rear PBs. (The component side 1 ofthe front and rear PB are in the same mechanical plane).

NOTES

1ÑThe drawings in this standard are not intended to indicate design.

2ÑAll dimensions are given in millimeters.

3ÑAll drawings in this standard are shown in Þrst angle projection according to ISO 1101-1983 [B12].

4ÑDimensions appearing in parentheses ( ) are for reference only, and are deÞned in the stated documents.

5ÑTerminology follows IEC 60050 [B2] and IEC 60916 (1988-07) [B7].

Handle

Front mounted plug-in unitsEMC or non-EMC

Handle

Rear mounted plug-in unitsEMC or non-EMCComponent side 1

Component side 1

Figure 1ÑGeneral arrangement

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5. Relationships of front and rear plug-in units

There are two possible ways to mount rear plug-in units into a subrack while providing for front and addi-tional rear plug-in units. They are as follows:

a) The in-line conÞguration, which is preferred (see Figure 2).b) The offset conÞguration, which is not detailed in this standard (see Figure 2).

This standard will only focus on the dimensional interchangeability of the in-line conÞguration.

5.1 The in-line conÞguration, non-EMC and EMC

The in-line conÞguration (see Figure 3) allows the front plug-in unit and the rear plug-in unit to be mechan-ically coplanar. It also allows the subrackÕs front plug-in units and front Þller panels, as standardized in IEEEP1101.1 (D1.0, 1997) and IEEE Std 1101.10-1996, to be mechanically mounted on the rear of the subrack(not necessarily electrically). At the same time, this conÞguration permits 3 row IEC 60603-2 C-type con-nectors to be mixed with 5 row IEC 61076-4-1xx connectors.

Figure 2ÑThe in-line versus the offset conÞguration

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6. Rear mounted plug-in unit printed board (Euroboard) sizes

IEEE 1101.1 board depths are (100) mm, (160) mm, (220) mm, (280) mm, (340) mm, and (400) mm incre-ments of 60 mm. For rear mounted plug-in units greater than 160 mm, the same depth increments apply (notshown in Figure 4). For depths less than 160 mm, the increment is 20 mm (see Table 1).

Table 1ÑRear mounted plug-in unit board depth (see Figure 4)

(Db +0/Ð0.3)

60 80 (100) 120 140 (160)

(Da

±

0.1)

53.67 73.67 (93.67) 113.67 133.67 (153.67)

Figure 3ÑIn-line front and rear non-EMC and EMC plug-in units

NOTEÑFor all dimensions in parentheses ( ), see IEEE P1101.1 (D1.0, 1997).

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6.1 Board height

For rear mounted plug-in unit PB heights, see Figure 4 and IEEE P1101.1 (D1.0, 1997).

6.2 Board depth

For additional board depth, see Figure 4 and IEEE P1101.1 (D1.0, 1997).

NOTEÑAll sizes as per IEEE P1101.1 (D1.0, 1997) are permitted.

6.3 Rear mounted plug-in unit inspection dimensions

The rear mounted plug-in unit inspection dimensions are deÞned in Table 2.

Table 2ÑRear mounted plug-in unit inspection dimensions (see Figure 5)

(Db) 60 80 (100) 120 140 (160)

(DT 2

±

0.4) Type R 3rowIEC 60603-2

69.88 89.88 109.88 129.88 149.88 169.88

(DT 2

±

0.4) Type R 5rowIEC 61076-4-1xx

72.38 92.38 112.38 132.38 152.38 172.38

Figure 4ÑRear mounted plug-in unit board matrix

NOTEÑFor all dimensions in parentheses ( ), see IEEE P1101.1 (D1.0, 1997).

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Copyright © 1998 IEEE. All rights reserved.

Center line

Inspectiondimension

(DT 2)

Fig. 5 Rear Mounted Plug-In UnitInspection Dimension Demension

(Db)

Connector

PB

Rear panel

Figure 5ÑRear mounted plug-in unit inspection dimension

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7. Connector orientation, pin labeling, and printed board component view

Connectors are generally deÞned as Òfree connectorsÓ (mounted to a plug-in unit) or as ÒÞxed connectorsÓ(mounted to a subrack via a backplane or direct to the rear of the subrack). Figure 6 illustrates the differencebetween a front plug-in unit connector and a rear plug-in unit connector. All front plug-in unit free connec-tors are abbreviated as PFC, all rear plug-in unit free connectors are abbreviated as RFC. The subrack Þxedconnector interfacing to the front plug-in unit, or Þxed subrack connector, is referred to as FSC. The rearsubrack (backplane mounted) connector (rear FSC connector tails are converted to a rear connector by usinga shroud) is referred to as RSC.

d c b a z123

(See Note)

Front PB Rear PB

Backplane

Spacer Connector tails

Shroud

PFC

RS

C

RFC

FSC

PB edge PB edge

PB edge

PB edge

NOTEÑThe pin numbering on the connector may show a permanent, molded-in Ò30Ó, Ò31Ó, and Ò32Ó in place of Ò1Ó, Ò2Ó, and Ò3Ó.

Figure 6ÑConnector orientation, pin labeling, and PB component view

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8. Subrack rear attachment plane

The rear attachment plane is based on the IEC 60603-2 C-type connector and IEC 61076-4-1xx connectorwith 17 mm tails. The part of the tail that is used as the rear Þxed connector contact pin shall comply withthe performance level of the front Þxed connector. The user will rely on the RDx inspection dimension toguarantee interchangeability with the appropriate plug-in unit.

The designer will utilize the RDc inspection dimension when choosing or designing connectors in compli-ance with this standard [based on IEC 60603-2 connectors. See IEEE P1101.1 (D1.0, 1997)]. Other connec-tors may require a different RDc inspection dimension (see Table 3).

Table 3ÑRear mounted plug-in unit subrack inspection dimensions (see Figure 7)

(Db) 60 80 (100) 120 140 (160)

RDc +0.5 Ð0 82.48 102.48 122.48 142.48 162.48 182.48

RDx

³

Type R 3rowIEC 60603-2

70.30 90.30 110.30 130.30 150.30 170.30

RDx

³

Type R 5rowIEC 61706-4-1xx

72.80 92.80 112.80 132.80 152.80 172.80

Figure 7ÑSubrack attachment planes and inspection dimensionsfor a 17 mm tail connector

NOTEÑFor all dimensions in parentheses ( ), see IEEE P1101.1 (D1.0, 1997).

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9. Rear backplane mounted plug-in unit Þxed connector relationship

The purpose of the connector shroud is to convert the tails that protrude out of the back of a subrack (via thebackplane) into connector pins (a connector) in accordance to IEC 60603-2 (1995-09) [B6] and IEC 61076-4-1xx (1998-Draft) [B10] (see Figure 8).

The shroud spacer and the shroud bottom thickness (which may or may not include the spacer) are eitherdeÞned by application, or agreed upon between manufacturer and user.

Figure 8ÑRear backplane mounted connector shroud on 17 mm tails

See Clause 8 of this standard

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10. Rear subrack connector (backplane mounted) shroud orientation

10.1 Connector shroud orientation

Connectors according to IEC 60603-2 (1995-09) [B6] and IEC 61076-4-1xx (1998-Draft) [B10] have a per-manent, molded-in mating orientation (see Figure 9). This molded-in mating orientation deÞnes the RSCshroud position.

11. Backplane bow and support

The number and type of connector contact pins used per plug-in unit will deÞne the amount of force exertedon the backplane. If the backplane thickness cannot absorb the connector force, then the backplane must bestiffened. The type of stiffener used is dependent on both the positioning and the number of connectorsrequired on the backplane (available space).

NOTEÑThe insertion/extraction deßection/bow of the backplane permitted is to be calculated within the min./max.inspection dimensions of the subrack [see IEEE P1101.1 (D1.0, 1997)].

Figure 9ÑRSC shroud orientation

Rear view of backplane

¥

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12. Connector performance

Connectors to IEC 60603-2 (1995-09) [B6] and IEC 61076-4-1xx (1998-Draft) [B10] are designed for dif-ferent performance classes. The rear backplane connector shroud (connector converted by use of shroud andextended pins from the front connector) must meet the mating area requirements (performance class) of thefront mounted connector. Since the use of electronics is permitted on the rear mounted plug-in units, the sys-tem designer is cautioned when powering these rear mounted plug-in units. If the rear mounted plug-in unituses the same pin for power as the front mounted plug-in unit, the total current is the sum of the frontmounted plug-in unit and the rear mounted plug-in unit.

13. Connector alignment

Space permitting additional connectors without contact pins may be used on a rear mounted plug-in unit toensure alignment with the connectors.

14. Rear mounted plug-in unit cooling consideration

When rear mounted plug-in units are installed the power dissipation needs to be considered. The construc-tion of the subrack should permit airßow management.

15. Front and rear plug-in unit front panel protective ground (See Figures 10 and 11)

15.1 Mechanical design

The plug-in unit front panel protective ground pin shall be based on the alignment pin as described in IEEEStd 1101.10-1996 Clause 6. Pin and receptacle shall be in mated condition.

15.2 Requirement

There are two requirements of this standard for plug-in unit front panel protective ground [IEC 60950 (1991-10) [B8] and IEC 61140 (1997-11) [B11]]. They are as follows:

a) Short term current/resistance (200 A at 100 m

W

for 5 ms); b) Continuous current/resistance (25 A at 100 m

W

continuous).

15.3 Resistance

The maximum resistance between the front panel of the plug-in unit and earth ground is 100 m

W

, and isdivided into three parts. They are as follows:

a) 40 m

W

maximum between the plug-in unit front panel (alignment/protective ground pin) and thesubrack (alignment/protective ground pin receptacle);

b) 40 m

W

maximum between the subrack (alignment/protective ground pin receptacle) and the subrackframe ground;

c) 20 m

W

maximum between the subrack frame ground and the earth ground.

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15.4 Minimum galvanic compatibility and contact operations

Minimum galvanic compatibility between the alignment/protective ground pin and the protector groundreceptacle is nickel-to-nickel, meaning both parts are nickel plated at a minimum. The minimum mechanicalendurance is 200 contact operations.

15.5 Pass criteria

After testing, the assembly tested must be reusable.

Figure 10ÑSubrack protective ground receptacle zone

Figure 11ÑSubrack front and rear protective ground receptacle position(subrack front view shown)

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Annex A

(normative)

Inspection Dimensions for Subracks and Associated Plug-in Units in Accordance with IEEE 1101.1, IEEE 1101.10 and IEEE Draft P1101.11 Using the IEC 61076-4-101 Connector Series

A.1 General overview

A.1.1 Annex scope

This annex may be applied in all Þelds of electronics where equipment and installations are required to con-form to the 482.6 mm (19 in) equipment practice based on IEEE P1101.1 (D1.0, 1997), IEEE Std 1101.10-1996, IEC 60297-3 (1984-01), and IEC 60297-4 (1995-03). This annex covers subracks equipped with frontplug-in units in accordance with IEEE P1101.1 (D1.0, 1997) and IEEE Std 1101.10-1996, and provides foradditional rear mounted plug-in units in the same subrack.

A.1.1.1 Choice of connectors

This annex refers only to connectors in accordance with IEC 61076-4-101 (1995-05) [B9], with referencesto IEEE P1101.1 (D1.0, 1997) and IEEE Std 1101.10-1996. Other suitable connectors may be mixed withIEC 61076-4-101 connectors on the same backplane. This annex deÞnes only the inspection dimensionsrequired for IEC 61076-4-101 compatible connectors.

A.1.1.2 Rear connector shrouds

This annex deÞnes the positioning and interface dimensions of compatible connector shrouds.

A.1.2 Annex purpose

The purpose of this annex is to specify dimensions that will ensure mechanical interchangeability of sub-racks and plug-in units based on IEEE P1101.1 (D1.0, 1997), IEEE Std 1101.10-1996, IEEE 1101.11-1998,IEC 60297-3 (1984-01), and IEC 60297-4 (1995-03), using IEC 61076-4-101 based connectors as well asIEC 61587-1 (May 1998-Draft) and IEC 61587-3 (May 1998-Draft) environmental requirements.

A.1.3 Subrack front and rear mounted plug-in units

This annex speciÞes additional features required to mount front and rear mounted plug-in units in subracks[based on IEC 60297-3 (1984-01) [B4], IEC 60297-4 (1995-03) [B5], IEEE P1101.1 (D1.0, 1997), andIEEE Std 1101.10-1996] that are based on the connector dependent dimensions of the IEC 61076-4-101connector series.

Applications may route user-deÞned input/output (I/O) through the subrack Þxed connectors (16 mm tailbackplane mounted connectors) out of the rear of the subrack via rear mounted plug-in units.

The typically front mounted plug-in unit printed board (PB) sizes (in increments of 60 mm), as deÞned inIEC 60297-3 (1984-01) [B4], IEC 60297-4 (1995-03) [B5], and IEEE P1101.1 (D1.0, 1997), have beenexpanded upon in order to make them suitable for rear mounted plug-in unit applications (in increments of20 mm). See Clause 6 of this standard.

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A.1.4 Front mounted plug-in unit inspection dimensions based on IEC 61076-4-101connectors (2 mm)

The front mounted plug-in unit inspection dimensions are deÞned in Table A.1.

Table A.1ÑFront mounted plug-in unit inspection dimensions (see Figure A.2)

(Db) 100 160 220 280 340 400

DT 2

±

0.4 111.74 171.74 231.74 291.74 351.74 411.74

Dg

±

0.1 76.5 136.5 196.5 256.5 316.5 376.5

Figure A.1ÑArrangement for subrack front/rear mounted plug-in units

NOTES

1ÑThe Dg dimension is used for mounting the solder side cover.

2ÑFor all dimensions in parentheses ( ), see IEEE P1101.1 (D1.0, 1997).

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A.1.5 Rear mounted plug-in unit inspection dimensions based on IEC 61076-4-101connectors (2 mm)

The rear mounted plug-in unit inspection dimensions are deÞned in Table A.2.

Table A.2ÑRear mounted plug-in unit inspection dimensions (see Figure A.3)

(Db) 60 80 (100) 120 140 (160)

DT 2

±

0.4 71.74 91.74 111.74 131.74 151.74 171.74

Dg

± 0.1 36.5 56.5 76.5 96.5 116.5 136.5

Figure A.2ÑFront mounted plug-in unit inspection dimensionsfor IEC 61076-4-101 connectors

NOTES

1ÑThe Dg dimension is used for mounting the solder side cover.

2ÑFor all dimensions in parentheses ( ), see IEEE P1101.1 (D1.0, 1997).

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A.1.6 Subrack rear attachment plane

The rear attachment plane is based on the IEC 60603-2 connector with 17 mm tails and the IEC 61076-4-101 connector with 16 mm tails. The part of the tail that is used as the rear Þxed connector contact pin shallcomply with the performance level of the front Þxed connector. The RDx inspection dimension enables theuser to inspect interchangeability with the appropriate plug-in unit.

The RDc inspection dimension is important for the designer of the subrack and backplane (see Table A.3).

Table A.3ÑRear mounted plug-in unit subrack inspection dimensions (see Figure A.4)

(Db) 60 80 (100) 120 140 (160)

RDc +0.5 Ð0 82.48 102.48 122.48 142.48 162.48 182.48

RDx ³ 72.14 92.14 112.14 132.14 152.14 172.14

Figure A.3ÑRear mounted plug-in inspection dimensionsfor IEC 61076-4-101 connectors

NOTEÑFor all dimensions in parentheses ( ), see IEEE P1101.1 (D1.0, 1997).

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A.1.7 Rear backplane mounted plug-in unit Þxed connector relationship

The purpose of the shroud is to convert tails that protrude out of the back of the subrack (via a backplane)into connector pins (a connector) in accordance to IEC 61076-4-101 (1995-05) [B9] (see Figure A.5).

The shroud spacer and the shroud bottom thickness (which may or may not include the shroud spacer) are tobe agreed upon by between manufacturer and user.

A.1.8 Connector alignment

Space permitting additional connectors without contacts may be used on a rear mounted plug-in unit toensure alignment with the connectors. Shrouds with alignment features may also be used.

Figure A.4ÑSubrack attachment planes and inspection dimensionsfor IEC 61076-4-101 connectors

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0.65±0.16

21.18±0.16

21.83

0.5 R

2.0

Cableconnector latch

Connector shroud

Figure A.5ÑRear backplane mounted connector shroud on 16 mm tails

See Clause A.1.6 of this annex

Detail A0.65±0.16

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Annex B

(informative)

Bibliography

[B1] ANSI/EIA 310-D-1992, Racks, Panels, and Associated Equipment.

[B2] IEC 60050 International Electrotechnical Vocabulary.

[B3] IEC 60297-1 (1986-09), Dimensions of mechanical structures of the 482.6 mm (19 in) series. Part 1:Panels and racks.

[B4] IEC 60297-3 (1984-01), Dimensions of mechanical structures of the 482.6 mm (19 in) series. Part 3:Subracks and associated plug-in units.

[B5] IEC 60297-4 (1995-03), Dimensions of mechanical structures of the 482.6 mm (19 in) series. Part 4:Subracks and associated plug-in unitsÑAdditional dimensions.

[B6] IEC 60603-2 (1995-09), Connectors for frequencies below 3 MHz for use with printed boardsÑPart 2:Detail speciÞcation for two-part connectors with assessed quality, for printed boards, for basic grid of 2.54mm (0.1 in) with common mounting features.

[B7] IEC 60916 (1988-07), Mechanical structures for electronic equipment: Terminology.

[B8] IEC 60950 (1991-10), Safety of information technology equipment.

[B9] IEC 61076-4-101 (1995-05), Connectors with assessed quality, for use in d.c. low-frequency analogueand in digital high speed data applicationsÑPart 4: Printed board connectorsÑSection 101: Detail speciÞca-tion for two-part connector modules having a basic grid of 2.0 mm for printed boards and backplanes inaccordance with IEC 60917.

[B10] IEC 61076-4-1xx, (1998-Draft) Expanded IEC (60)603-2 Type C Connector.

[B11] IEC 61140 (1997-11), Protection against electric shockÑCommon aspects for installation and equip-ment.

[B12] ISO 1101: 1983, Extract 1: 1983, Technical drawingÑGeometrical tolerancingÑToleranced charac-teristics and symbolsÑExamples of indication.