ISO/IEC 11801-5:2017

ISO/IEC 11801-5
Edition 1.0 2017-11
INTERNATIONAL
STANDARD
Information technology – Generic cabling for customer premises –
Part 5: Data centres
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about
ISO/IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address
below or your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
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

– 2 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
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

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

– 4 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
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

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

– 6 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
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
from all interested IEC National Committees and ISO member bodies.
3) IEC, ISO and ISO/IEC publications have the form of recommendations for international use and are accepted
by IEC National Committees and ISO member bodies in that sense. While all reasonable efforts are made to
ensure that the technical content of IEC, ISO and ISO/IEC publications is accurate, IEC or ISO cannot be held
responsible for the way in which they are used or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees and ISO member bodies undertake to
apply IEC, ISO and ISO/IEC publications transparently to the maximum extent possible in their national and
regional publications. Any divergence between any ISO, IEC or ISO/IEC publication and the corresponding
national or regional publication should be clearly indicated in the latter.
5) ISO and IEC do not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. ISO or IEC are not responsible
for any services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or ISO or its directors, employees, servants or agents including individual
experts and members of their technical committees and IEC National Committees or ISO member bodies for
any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or
for costs (including legal fees) and expenses arising out of the publication of, use of, or reliance upon, this
ISO/IEC publication or any other IEC, ISO or ISO/IEC publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this ISO/IEC publication may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
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.

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.

– 8 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
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

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 compatibility with the cabling performance specified in
this document and, together with statistics concerning premises geography from different
countries and the models described in Clause 6, have been used to develop the requirements
for cabling components and to stipulate their arrangement into cabling systems.
As a result, this International Standard specifies a structure for generic cabling supporting a
wide variety of applications, which
1) adopts balanced cabling channel and link Classes E , F, F , I and II specified in
A A
ISO/IEC 11801-1,
2) adopts component requirements, specified in ISO/IEC 11801-1, and specifies cabling
implementations that ensure performance of permanent links and of channels that meet or
exceed the requirements of a specified group (e.g. Class) of applications,
3) adopts optical fibre cabling channel and link requirements specified in ISO/IEC 11801-1.
Life expectancy of generic cabling systems can vary depending on environmental conditions,
supported applications, aging of materials used in cables, and other factors such as access to
pathways (campus pathways are more difficult to access than building pathways). With
appropriate choice of components, generic cabling systems meeting the requirements of this
document are expected to have a life expectancy of at least ten years
This document has taken into account requirements specified in application standards listed
in ISO/IEC 11801-1:2017, Annex E. It refers to International Standards for components and
test methods whenever appropriate International Standards are available.

– 10 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
INFORMATION TECHNOLOGY –
GENERIC CABLING FOR CUSTOMER PREMISES –

Part 5: Data centres
1 Scope
This part of ISO/IEC 11801 specifies generic cabling within and to the computer room spaces
of data centre premises, or data centre spaces within other types of buildings. It covers
balanced cabling and optical fibre cabling.
This document is optimized for premises in which the maximum distance over which
telecommunications services can be distributed is 2 000 m. The principles of this document
can also be applied to larger installations.
Cabling specified by this document supports a wide range of services including voice, data
and video that can also incorporate the supply of power.
This document specifies directly or via reference to ISO/IEC 11801-1
a) the structure and minimum configurations for generic cabling within data centres,
b) the interfaces at the equipment outlet (EO) and the external network interface (ENI),
c) the performance requirements for cabling links and channels,
d) the implementation requirements and options,
e) the performance requirements for cabling components,
f) the conformance requirements and verification procedures.
Safety (e.g. electrical safety and protection, fire) and electromagnetic compatibility (EMC)
requirements are outside the scope of this document, and are covered by other standards and
by regulations. However, information given by this document can be of assistance.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60603-7-7, Connectors for electronic equipment – Part 7-7: Detail specification for 8-way,
shielded, free and fixed connectors for data transmissions with frequencies up to 600 MHz
IEC 60603-7-41, Connectors for electronic equipment – Part 7-41: Detail specification for
8-way, unshielded, free and fixed connectors, for data transmissions with frequencies up to
500 MHz
IEC 60603-7-51, Connectors for electronic equipment – Part 7-51: Detail specification for
8-way, shielded, free and fixed connectors, for data transmissions with frequencies up to
500 MHz
IEC 60603-7-71, Connectors for electronic equipment – Part 7-71: Detail specification for
8-way, shielded, free and fixed connectors, for data transmission with frequencies up to
1 000 MHz
IEC 60603-7-81, Connectors for electronic equipment – Part 7-81: Detail specification for
8-way, shielded, free and fixed connectors, for data transmissions with frequencies up to
2 000 MHz
IEC 60603-7-82, Connectors for electronic equipment – Part 7-82: Detail specification for
8-way, 12 contacts, shielded, free and fixed connectors, for data transmissions with
frequencies up to 2 000 MHz
IEC 60874-19-1, Fibre optic interconnecting devices and passive components – Connectors
for optical fibres and cables – Part 19-1: Fibre optic patch cord connector type SC-PC
(floating duplex) standard terminated on multimode fibre type A1a, A1b – Detail specification
IEC 61754-7-1, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 7-1: Type MPO connector family – One fibre row
IEC 61754-7-2, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 7-2: Type MPO connector family – Two fibre rows
IEC 61754-20, Fibre optic connector interfaces – Part 20: Type LC connector family
IEC 61755-3-2, Fibre optic connector optical interfaces – Part 3-2: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode
fibres
ISO/IEC 11801-1:2017, Information technology – Generic cabling for customer premises –
Part 1: General requirements
ISO/IEC 14763-2, Information technology – Implementation and operation of customer
premises cabling – Part 2: Planning and installation
ISO/IEC 30129, Information technology – Telecommunications bonding networks for buildings
and other structures
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 11801-1 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
computer room
one or more spaces primarily dedicated to housing cabling and equipment used for
electronics data storage, processing and networking
3.1.2
computer room space
area within the data centre that accommodates the data processing, data storage and
telecommunications equipment that provides the primary function of the data centre

– 12 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
3.1.3
equipment outlet
fixed connecting device for terminating the zone distribution cabling and providing the
interface to the equipment cord
3.1.4
fixed zone distribution cable
cable connecting the zone distributor to either the equipment outlet or, if present, the local
distribution point
3.1.5
intermediate distribution cable
cable connecting the intermediate distributor to the zone distributor
3.1.6
intermediate distributor
distributor used to make connections between the main distribution cabling subsystem,
intermediate distribution cabling subsystem, network access cabling subsystem and cabling
subsystems specified in ISO/IEC 11801-1 and active equipment
3.1.7
local distribution point
connection point in the zone distribution cabling subsystem between a zone distributor and an
equipment outlet
3.1.8
local distribution point cable
cable connecting a local distribution point to an equipment outlet
3.1.9
local distribution point link
transmission path between a local distribution point and the interface at the other end of the
fixed zone distribution cable including the connecting hardware at each end
3.1.10
main distribution cable
cable connecting the main distributor to the intermediate distributor or the zone distributor
3.1.11
main distributor
distributor used to make connections between the main distribution cabling subsystem,
network access cabling subsystem and cabling subsystems as specified in ISO/IEC 11801-1
and active equipment
3.1.12
network access cable
cable connecting the external network interface (or other distributors of the ISO/IEC 11801
series) to the main distributor, intermediate distributor or zone distributor
3.1.13
transition assembly
assembly of cabled optical fibres and connectors, with an MPO connector on one end and
simplex or duplex connectors on the other end
3.1.14
zone distribution cable
cable connecting the zone distributor to the equipment outlet(s) or local distribution point(s),
where present
3.1.15
zone distributor
distributor used to make connections between the main distribution cabling subsystem,
intermediate distribution cabling subsystem, zone distribution cabling subsystem, network
access cabling subsystem, cabling subsystems specified in ISO/IEC 11801-1 and active
equipment
3.2 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO/IEC 11801-1 and the
following apply.
CuC copper cabling
ENI external network interface
EO equipment outlet
ID intermediate distributor
LDP local distribution point
MD main distributor
OFC optical fibre cabling
SAN storage area network
ZD zone distributor
4 Conformance
For a cabling installation to conform to this document the following applies.
a) The configuration and structure shall conform to the requirements outlined in Clause 5.
b) Channels shall meet the requirements specified in Clause 6 when subjected to
environment conditions, local to the channels (see NOTE below), as defined by the
applicable environmental Class(es) of Clause 6.
This shall be achieved by one of the following:
1) a channel design and implementation ensuring that the prescribed channel
performance of Clause 6 is met;
2) attachment of appropriate components to a permanent link or CP link design meeting
the prescribed performance class of Clause 7. Channel performance shall be ensured
where a channel is created by adding more than one cord to either end of a link
meeting the requirements of Clause 7;
3) for E1 environments, using the reference implementations of Clause 8 and compatible
cabling components conforming to the requirements of Clauses 9, 10, and 11, that is
based upon a statistical approach of performance modelling.
c) The interfaces to the cabling at the EO shall conform to the requirements of Clause 10
with respect to mating interfaces and performance when subjected to environment
conditions, local to the connecting hardware (see NOTE below), as defined by the
applicable environmental Class(es) of Clause 6.
d) Connecting hardware at other places in the cabling structure shall meet the performance
requirements specified in Clause 10 when subjected to environment conditions, local to
the connecting hardware (see NOTE below), as defined by the applicable environmental
Class(es) of Clause 6.
e) The requirements of ISO/IEC 14763-2 and ISO/IEC 30129 shall be met.
This document does not specify which tests and sampling levels should be adopted. Test
methods to assess conformance with the channel and link requirements of Clause 6 and
Clause 7, respectively, are specified in ISO/IEC 11801-1. The test parameters to be
measured, the sampling levels and the treatment of measured results to be applied for

– 14 – ISO/IEC 11801-5:2017 © ISO/IEC 2017
particular installation shall be defined in the installation specification and quality plan for that
installation prepared in accordance with ISO/IEC 14763-2.
In the absence of the channel, the conformance of the link shall be used to verify
conformance with ISO/IEC 11801-5.
Specifications marked "ffs" are preliminary specifications, and are not required for
conformance to this document.
NOTE The applicable environmental classification of ISO/IEC 11801-1:2017, 6.2.2, local to the cabling or cabling
component(s), is that of the environment immediately adjacent to the cabling or cabling component(s).
5 Structure of the generic cabling system
5.1 General
Clause 5 identifies the functional elements of generic cabling for data centres, describes how
they are connected together to form subsystems and identifies the interfaces at which
application-specific components are connected to the generic cabling. Examples of structures
in accordance with Clause 5 can be found in Annex C.
Applications listed in ISO/IEC 11801-1:2017, Annex E are supported by connecting active
equipment at the external network interfaces, equipment outlets and the distributors.
Examples of network architectures in accordance with Clause 5 can be found in Annex D.
5.2 Functional elements
The functional elements of generic cabling are as follows:
a) external network interface (ENI) – not defined in ISO/IEC 11801-1;
b) network access cable – not defined in ISO/IEC 11801-1;
c) main distributor (MD) – equivalent to distributor 3 in ISO/IEC 11801-1;
d) main distribution cable – equivalent to subsystem cable 3 in ISO/IEC 11801-1;
e) intermediate distributor (ID) – equivalent to distributor 2 in ISO/IEC 11801-1;
f) intermediate distribution cable – equivalent to subsystem cable 2 in ISO/IEC 11801-1;
g) zone distributor (ZD) – equivalent to distributor 1 in ISO/IEC 11801-1;
h) zone distribution cable – equivalent to subsystem cable 1 in ISO/IEC 11801-1;
i) local distribution point (LDP) – equivalent to consolidation point in ISO/IEC 11801-1;
j) local distribution point cable (LDP cable) – equivalent to cable Y in ISO/IEC 11801-1;
k) equipment outlet (EO) – equivalent to TE outlet in ISO/IEC 11801-1.
Groups of these functional elements are connected together to form cabling subsystems to
provide the required applications to the telecommunications equipment and terminal
equipment.
5.3 General structure and hierarchy
Generic cabling systems in data centres contain up to four cabling subsystems: network
access cabling, main distribution cabling, intermediate distribution cabling and zone
distribution cabling. Where present within the premises, distributors of other parts of the
ISO/IEC 11801 series are connected to the generic cabling within the data centre using the
network access cabling.
The cabling subsystems are connected together to create a generic cabling system with a
structure as shown in Figure 2. The composition of the cabling subsystems is described in
5.4.2, 5.4.3,
...