ISO/IEC 11801-5:2017
(Main)Information technology — Generic cabling for customer premises — Part 5: Data centres
Information technology — Generic cabling for customer premises — Part 5: Data centres
ISO/IEC 11801-5:2017(E) This document specifies generic cabling within and to the computer room spaces of data centre premises, or computer room spaces within other types of building. Additionally those premises can include office spaces (for which generic cabling is specified in ISO/IEC 11801-2) or industrial spaces (for which generic cabling is specified in ISO/IEC 11801-3).
Technologies de l'information — Câblage générique des locaux d'utilisateurs — Partie 5: Titre manque
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ISO/IEC 11801-5
Edition 1.0 2017-11
INTERNATIONAL
STANDARD
Information technology – Generic cabling for customer premises –
Part 5: Data centres
ISO/IEC 11801-5:2017-11(en)
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ISO/IEC 11801-5
Edition 1.0 2017-11
INTERNATIONAL
STANDARD
Information technology – Generic cabling for customer premises –
Part 5: Data centres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.200 ISBN 978-2-8322-5043-3
Warning! Make sure that you obtained this publication from an authorized distributor.
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CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviated terms . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms . 13
4 Conformance . 13
5 Structure of the generic cabling system . 14
5.1 General . 14
5.2 Functional elements . 14
5.3 General structure and hierarchy . 14
5.4 Cabling subsystems . 16
5.4.1 General . 16
5.4.2 Network access cabling subsystem . 16
5.4.3 Main distribution cabling subsystem . 16
5.4.4 Intermediate distribution cabling subsystem . 16
5.4.5 Zone distribution cabling subsystem . 16
5.4.6 Design objectives . 17
5.5 Accommodation of functional elements . 17
5.6 Interfaces . 17
5.6.1 Equipment interfaces and test interfaces . 17
5.6.2 Channels and links . 18
5.7 Dimensioning and configuring . 19
5.7.1 Distributors . 19
5.7.2 Redundancy . 20
5.7.3 External network interface . 21
5.7.4 Cables . 22
5.7.5 Equipment cords . 22
5.7.6 Patch cords and jumpers . 22
5.7.7 Equipment outlets . 22
5.7.8 LDP . 23
5.7.9 Building entrance facilities . 23
5.8 Earthing and equipotential bonding . 23
6 Channel performance requirements . 23
6.1 General . 23
6.2 Environmental performance . 25
6.3 Transmission performance . 25
6.3.1 General . 25
6.3.2 Balanced cabling . 25
6.3.3 Optical fibre cabling . 25
7 Link performance requirements . 26
7.1 General . 26
7.2 Balanced cabling . 26
7.3 Optical fibre cabling . 26
8 Reference implementations . 26
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ISO/IEC 11801-5:2017 © ISO/IEC 2017 – 3 –
8.1 General . 26
8.2 Balanced cabling . 26
8.2.1 Assumptions . 26
8.2.2 Zone distribution cabling . 27
8.2.3 Cabling between distributors . 30
8.2.4 Network access cabling . 33
8.3 Optical fibre cabling . 35
8.3.1 General . 35
8.3.2 Component choice . 35
8.3.3 Dimensions . 36
9 Cable requirements . 36
9.1 General . 36
9.2 Balanced cables . 36
9.3 Optical fibre cables . 36
10 Connecting hardware requirements . 36
10.1 General requirements . 36
10.1.1 Overview . 36
10.1.2 Location . 36
10.1.3 Design . 37
10.1.4 Operating environment . 37
10.1.5 Mounting . 37
10.1.6 Installation practices . 37
10.1.7 Marking and colour coding . 37
10.2 Connecting hardware for balanced cabling . 37
10.2.1 General requirements . 37
10.2.2 Performance marking . 37
10.2.3 Mechanical characteristics . 37
10.3 Connecting hardware for optical fibre cabling . 38
10.3.1 General requirements . 38
10.3.2 ENI requirements . 38
10.3.3 EO requirements . 38
10.3.4 Optical fibre assignments at the EO . 39
10.3.5 Other connecting hardware . 39
11 Requirements for cords and jumpers . 39
11.1 Jumpers . 39
11.2 Balanced cords . 39
11.3 Optical fibre cords . 39
Annex A (normative) Combination of balanced cabling links . 40
A.1 General . 40
A.2 Requirements . 40
Annex B (informative) Usage of high density connecting hardware within optical fibre
cabling. 41
B.1 General . 41
B.2 Use cases for high density connecting hardware . 41
Annex C (informative) Examples of structures in accordance with ISO/IEC 11801-5 . 45
C.1 General . 45
C.2 Data centre minimum configuration . 46
C.3 End of Row concept . 47
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C.4 Middle of Row concept . 48
C.5 Top of Rack concept . 49
C.6 End of Row and Middle of Row concept with redundancy . 50
C.7 Top of Rack concept with redundancy . 51
C.8 End of Row concept with full redundancy . 52
C.9 Top of Rack concept with redundancy . 53
Annex D (informative) Examples of networking architectures . 54
D.1 General . 54
D.2 Data centre fabric fat-tree . 54
D.3 Data centre fabric full-mesh . 55
D.4 Data centre fabric interconnected meshes . 55
D.5 Data centre fabric centralized switch . 56
D.6 Data centre fabric virtual switch . 57
Bibliography . 58
Figure 1 – Relationships between the generic cabling documents produced by
ISO/IEC JTC 1/SC 25 . 8
Figure 2 – Structure of generic cabling within a data centre . 15
Figure 3 – Hierarchical structure of generic cabling within a data centre . 15
Figure 4 – Example of accommodation of functional elements . 17
Figure 5 – Test and equipment interfaces . 19
Figure 6 – Connection of functional elements providing redundancy . 21
Figure 7 – Examples of external service cabling connections to the ENI . 22
Figure 8 – Example of a channel with four connections . 24
Figure 9 – Example of a system showing the location of cabling interfaces . 25
Figure 10 – Zone distribution cabling models . 28
Figure 11 – Cabling model between distributors using Class E to F . 31
A A
Figure 12 – Cabling model between distributors using Class I and II . 31
Figure 13 – Network access cabling models . 34
Figure A.1 – Examples of combination of different links . 40
Figure B.1 – Examples of high density connecting hardware within main distribution
cabling and intermediate distribution cabling . 42
Figure B.2 – Examples of high density connecting hardware at the LDP and EO within
zone distribution cabling . 44
Figure C.1 – Key for Figures C.2 through C.9 . 45
Figure C.2 – Example of a minimum configuration . 46
Figure C.3 – Example of End of Row configuration . 47
Figure C.4 – Example of Middle of Row configuration . 48
Figure C.5 – Example of Top of Rack configuration . 49
Figure C.6 – Example of End of Row configuration with redundancy . 50
Figure C.7 – Example of Top of Rack configuration with redundancy . 51
Figure C.8 – Example of End of Row configuration with full redundancy . 52
Figure C.9 – Example of Top of Rack configuration with full redundancy . 53
Figure D.1 – Fat-tree example . 54
Figure D.2 – Full-mesh example . 55
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ISO/IEC 11801-5:2017 © ISO/IEC 2017 – 5 –
Figure D.3 – Interconnected mesh example . 56
Figure D.4 – Centralized switch example . 56
Figure D.5 – Virtual switch example . 57
Table 1 – Zone distribution cabling – length assumptions for balanced cabling using
Classes E to F . 29
A A
Table 2 – Zone distribution cabling – length assumptions for balanced cabling using
Classes I and II . 30
Table 3 – Zone distribution channel length equations for Classes . 30
Table 4 – Cabling between distributors – length assumptions for balanced cabling
using Classes E to F . 31
A A
Table 5 – Cabling between distributors – length assumptions for balanced cabling
using Classes I and II . 32
Table 6 – Length equations for cabling between distributors . 32
Table 7 – Network access cabling channel equations . 35
Table 8 – Connecting hardware of the type used at the EO . 37
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INFORMATION TECHNOLOGY –
GENERIC CABLING FOR CUSTOMER PREMISES –
Part 5: Data centres
FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees established
by the respective organization to deal with particular fields of technical activity. ISO and IEC technical
committees collaborate in fields of mutual interest. Other international organizations, governmental and non-
governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology,
ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
2) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
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apply IEC, ISO and ISO/IEC publications transparently to the maximum extent possible in their national and
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International Standard ISO/IEC 11801-5 was prepared by subcommittee 25: Interconnection
of information technology equipment, of ISO/IEC joint technical committee 1: Information
technology.
This first edition cancels and replaces ISO/IEC 24764:2010 and Amendment 1:2014. This
edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) standard re-structured to contain only those requirements that are specific for generic
cabling systems installed in data centres;
b) addition of balanced cabling channels Class I and Class II;
c) addition of examples of structures in accordance with ISO/IEC 11801-5 in Annex C;
d) addition of examples of networking architectures in Annex D.
ISO/IEC 11801-5 is to be read in conjunction with ISO/IEC 11801-1.
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ISO/IEC 11801-5:2017 © ISO/IEC 2017 – 7 –
This International Standard has been approved by vote of the member bodies, and the voting
results can be obtained from the address given on the second title page.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the ISO/IEC 11801 series, published under the general title Information
technology – Generic cabling for customer premises, can be found on the IEC website.
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INTRODUCTION
The importance of cabling infrastructure is similar to that of other fundamental utilities such as
water and energy supply and interruptions to the services provided over that infrastructure
can have a serious impact. A lack of design foresight, the use of inappropriate components,
incorrect installation, poor administration or inadequate support can threaten quality of service
and have commercial consequence for all types of users.
This document specifies generic cabling within and to the computer room spaces of data
centre premises, or computer room spaces within other types of building.
Additionally those premises can include
• office spaces for which generic cabling is specified in ISO/IEC 11801-2,
• industrial spaces for which generic cabling is specified in ISO/IEC 11801-3.
Generic cabling for distributed building services in data centre spaces is specified in
ISO/IEC 11801-6, which addresses all of the above premises and spaces within them.
Figure 1 shows the schematic and contextual relationships between the standards relating to
information technology cabling produced by ISO/IEC JTC 1/SC 25, namely the ISO/IEC 11801
series of standards for generic cabling design, standards for the installation, operation and
administration of generic cabling and for testing of installed generic cabling.
IEC
Figure 1 – Relationships between the generic cabling
documents produced by ISO/IEC JTC 1/SC 25
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ISO/IEC 11801-5:2017 © ISO/IEC 2017 – 9 –
The generic cabling specified by this document provides users with
a) an application independent system capable of supporting a wide range of applications in a
range of installation and operating environments,
b) a flexible scheme such that modifications are both easy and economical,
c) a multi-vendor supply chain within an open market for cabling components.
In addition, this document provides
d) relevant industry professionals with guidance allowing the accommodation of cabling
before specific requirements are known, i.e. in the initial planning either for construction or
refurbishment and for further deployment as the requirements of areas are defined,
e) industry and standardization bodies with a cabling system which supports current products
and provides a basis for future product development and applications standardization.
Applications addressed in this document include those developed by the technical committees
of IEC (including the subcommittees of ISO/IEC JTC 1) and study groups of ITU-T as used to
support high data rate, mission-critical services within the densely connected environment of
data centre spaces.
This document has taken into account requirements specified in application standards listed
in Annex E of ISO/IEC 11801-1:2017.
This document should be read in conjunction with ISO/IEC 11801-1, which was created to
consolidate general requirements for generic cabling into a single standard which allows the
other standards in the ISO/IEC 11801 series to have a common reference.
Physical layer requirements for the applications listed in Annex E of ISO/IEC 11801-1:2017
have been analysed to determine their
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