ISO/IEC 24702:2006

INTERNATIONAL ISO/IEC
STANDARD 24702
First edition
2006-10
Information technology –
Generic cabling –
Industrial premises
Reference number
INTERNATIONAL ISO/IEC
STANDARD 24702
First edition
2006-10
Information technology –
Generic cabling –
Industrial premises
Copyright  2006 ISO/IEC, Geneva   All rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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CONTENTS
FOREWORD.7

INTRODUCTION.8

1 Scope.10

2 Normative references .10

3 Definitions and abbreviations.13

3.1 Definitions .13
3.2 Abbreviations .15
4 Conformance.15
5 Structure .16
5.1 General .16
5.2 Functional elements .16
5.3 Cabling subsystem .17
5.3.1 General structure.17
5.3.2 Campus backbone cabling subsystem .18
5.3.3 Building backbone cabling subsystem.18
5.3.4 Floor cabling subsystem .18
5.3.5 Intermediate cabling subsystem.19
5.3.6 Centralized cabling architecture.19
5.3.7 Design objectives .19
5.4 Interconnection of subsystems .20
5.5 Accommodation of functional elements.21
5.6 Interfaces .22
5.6.1 Equipment interfaces and test interfaces .22
5.6.2 Channels and permanent links.22
5.6.3 External network interface .22
5.7 Dimensioning and configuring.22
5.7.1 General .22
5.7.2 Distributors.23
5.7.3 Cables.23
5.7.4 Apparatus attachment and equipment cords .23

5.7.5 Patch cords and jumpers .23
5.7.6 TO.23
5.7.7 Telecommunications rooms and equipment rooms.24
5.7.8 Industrial enclosures .24
5.7.9 Building entrance facilities.24
6 Channel performance .24
6.1 General .24
6.2 Environmental performance.26
6.2.1 General .26
6.2.2 Environmental classification .26
6.3 Transmission performance .28
6.3.1 General .28
6.3.2 Balanced cabling .29
6.3.3 Optical fibre cabling.33

24702  ISO/IEC:2006(E) – 3 –
7 Reference implementations .34

7.1 General .34

7.2 Balanced cabling.35

7.2.1 General .35

7.2.2 Intermediate cabling .35

7.2.3 Backbone cabling .35

7.3 Optical fibre cabling .35

7.3.1 General .35

7.3.2 Component choice.35

7.3.3 Maximum channel lengths .35
8 Cable requirements .36
8.1 Introduction .36
8.2 Operating environment .36
8.3 Balanced cables .37
8.4 Optical fibre cables.37
8.4.1 All-silica optical fibre cables .37
8.4.2 Plastic optical fibre cables .38
8.4.3 Plastic clad silica optical fibre cables.39
8.4.4 Propagation delay .39
9 Connecting hardware requirements .39
9.1 Introduction .39
9.2 General requirements.40
9.2.1 Location .40
9.2.2 Design.40
9.2.3 Mounting .40
9.2.4 Marking and colour coding.41
9.3 Operating environment .41
9.4 Connecting hardware for balanced cabling .41
9.4.1 General requirements .41
9.4.2 Performance marking .41
9.4.3 Operating environment .41
9.4.4 Mechanical and electrical characteristics of balanced connecting
hardware .42
9.5 Connecting hardware for optical fibres .44
9.5.1 Operating environment .44

9.5.2 Connecting hardware for all-silica optical fibres .45
9.5.3 Connecting hardware for plastic optical fibres.45
9.5.4 Connecting hardware for plastic clad silica fibres.46
10 Cords .47
10.1 General .47
10.2 Operating environment .47
10.3 Balanced cords .47
10.3.1 General .47
10.3.2 Cable insertion loss .48
10.3.3 Identification.48
10.3.4 Operating environment .48
10.3.5 Electrical performance requirements for patch cords .49

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10.4 Optical fibre cords .49

10.4.1 General .49

10.4.2 Identification.50

10.4.3 Performance requirements for patch cords .50

10.4.4 Operating environment .50

Annex A (normative) Permanent link performance limits .52

A.1 General .52

A.2 Balanced cabling .52

A.2.1 General .52

A.2.2 Additional requirements.53
A.2.3 Optical fibre cabling .54
Annex B (normative) Test methods .55
B.1 General .55
B.1.1 Visual inspection .55
B.1.2 Measurements.55
B.2 Test parameters for balanced cabling .60
B.2.1 General .60
B.2.2 Wire map.60
B.2.3 Length.60
B.2.4 Propagation delay .60
B.2.5 Delay skew.61
B.2.6 Attenuation (insertion loss).61
B.2.7 Near end crosstalk loss (NEXT, pair-to-pair and power sum) .61
B.2.8 Equal level far end crosstalk loss (ELFEXT, pair-to-pair and power sum) .61
B.2.9 Attenuation to crosstalk ratio (ACR, pair-to-pair and power sum).61
B.2.10 Return loss.
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