EN 50600-2-4:2015

SLOVENSKI STANDARD
01-maj-2015
Informacijska tehnologija - Naprave in infrastruktura podatkovnega centra - 2-4.
del: Pokabljenje za telekomunikacije
Information technology - Data centre facilities and infrastructures -- Part 2-4:
Telecommunications Cabling Infrastructure
Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren -- Teil 2-4:
Infra¬struktur der Telekommunikationsverkabelung
Technologie de l’information - Installation et infrastructures de centres de traitement de
données -- Partie 2-4: Infrastructure du câblage dédié télécommunications
Ta slovenski standard je istoveten z: EN 50600-2-4:2015
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50600-2-4

NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2015
ICS 35.020; 35.110; 35.160
English Version
Information technology - Data centre facilities and infrastructures
- Part 2-4: Telecommunications cabling infrastructure
Technologie de l'information - Installation et infrastructures Informationstechnik - Einrichtungen und Infrastrukturen von
de centres de traitement de données - Partie 2-4: Rechenzentren - Teil 2-4: Infrastruktur der
Infrastructure du câblage dédié télécommunications Telekommunikationsverkabelung
This European Standard was approved by CENELEC on 2015-02-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50600-2-4:2015 E
Content
Foreword . 5
Introduction . 6
1 Scope . 8
2 Normative references. 8
3 Terms, definitions and abbreviations . 9
3.1 Terms and definitions . 9
3.2 Abbreviations . 10
4 Conformance . 11
5 Telecommunications cabling within the data centre . 11
5.1 General . 11
5.2 Information technology and network telecommunications cabling in the computer room space . 14
5.3 Structured cabling for other data centre spaces and application specific structured cabling . 16
6 Availability design principles for telecommunications cabling infrastructure . 17
7 Availability classification for telecommunications cabling infrastructure . 17
7.1 General . 17
7.2 Telecommunications cabling for the computer room . 18
7.3 Telecommunications cabling for offices . 22
7.4 Telecommunications cabling for monitoring and control . 22
8 Pathways and pathway systems for telecommunications cabling . 22
8.1 General . 22
8.2 Pathways . 23
8.3 Pathway systems . 24
9 Cabinets and racks for the computer room space . 25
9.1 General requirements. 25
9.2 Requirements for dimensions . 25
9.3 Recommendations . 25
10 Documentation and quality plan . 25
10.1 Requirements for documentation . 25
10.2 Recommendations for documentation . 25
10.3 Requirements for the quality plan . 26
11 Management and operation of the telecommunications cabling infrastructure . 26
11.1 General . 26
11.2 Automated infrastructure management systems . 26
11.3 Fibre optic cabling . 26
Annex A (normative) Cabling design concepts . 27
A.1 General . 27

– 3 – EN 50600-2-4:2015
A.2 Class 1 cabling concept . 27
A.3 Class 2 cabling concepts . 28
A.4 Class 3 cabling concepts . 30
A.5 Class 4 cabling concepts . 32
Annex B (informative) Energy efficiency considerations for the telecommunications cabling
infrastructure . 35
Bibliography . 36
Figures
Figure 1 - Schematic relationship between the EN 50600 standards . 7
Figure 2 – Impact of growth in an unstructured point-to-point cabling infrastructure . 13
Figure 3 – Example of point-to-point cabling . 13
Figure 4 – Structured cabling infrastructure: setup and growth . 14
Figure 5 – Data centre cabling subsystems according to EN 50173-5 . 15
Figure 6 – Office cabling subsystems according to EN 50173-2 . 15
Figure 7 – Building service cabling subsystem according to EN 50173-6 . 16
Figure 8 – Telecommunication cabling Class 1 using direct attached cords . 18
Figure 9 – Transmission channels (interconnect and cross-connect) . 19
Figure 10 – ENI redundancy for Class 1 and 2 . 19
Figure 11 – Managing moves, adds and changes . 20
Figure 12 - Redundant multipath telecommunication cabling Class 3 . 20
Figure 13 - Redundant multipath telecommunication cabling Class 4 . 21
Figure A.1 – Symbols of network elements . 27
Figure A.2 – Example of a Class 1 cabling implementation . 27
Figure A.3 – Example for Class 2 EoR cabling implementation. 28
Figure A.4 – Example for Class 2 MoR cabling implementation . 29
Figure A.5 – Example for Class 2 ToR cabling implementation . 30
Figure A.6 – Example for Class 3 EoR cabling implementation. 31
Figure A.7 – Example for Class 3 ToR cabling implementation . 32
Figure A.8 – Example for Class 4 EoR cabling implementation. 33

Figure A.9 – Example for Class 4 ToR cabling implementation . 34
Tables
Table 1 – Telecommunication cabling Availability Classes per space architecture and overall data centre
Availability Class for facilities and infrastructures . 18

– 5 – EN 50600-2-4:2015
Foreword
This document (EN 50600-2-4:2015) has been prepared by CLC/TC 215 "Electrotechnical aspects of
telecommunication equipment".
The following dates are fixed:
• latest date by which this document has to be (dop) 2016-02-16
implemented at national level by publication
of an identical national standard or by
endorsement
(dow) 2018-02-16
• latest date by which the national standards
conflicting with this document have to
be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and
the European Free Trade Association.

Introduction
The unrestricted access to internet-based information demanded by the information society has led to an
exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are housing
and supporting the information technology and network telecommunications equipment for data processing,
data storage and data transport. They are required both by network operators (delivering those services to
customer premises) and by enterprises within those customer premises.
Data centres need to provide modular, scalable and flexible facilities and infrastructures to easily
accommodate the rapidly changing requirements of the market. In addition, energy consumption of data
centres has become critical both from an environmental point of view (reduction of carbon footprint) and with
respect to economical considerations (cost of energy) for the data centre operator.
The implementation of data centres varies in terms of:
a) purpose (enterprise, co-location, co-hosting or network operator facilities);
b) security level;
c) physical size;
d) accommodation (mobile, temporary and permanent constructions).
The needs of data centres also vary in terms of availability of service, the provision of security and the
objectives for energy efficiency. These needs and objectives influence the design of data centres in terms of
building construction, power distribution, environmental control and physical security. Effective management
and operational information is required to monitor achievement of the defined needs and objectives.
This series of European Standards specifies requirements and recommendations to support the various
parties involved in the design, planning, procurement, integration, installation, operation and maintenance of
facilities and infrastructures within data centres. These parties include:
1) owners, facility managers, ICT managers, project managers, main contractors;
2) architects, building designers and builders, system and installation designers;
3) facility and infrastructure integrators, suppliers of equipment;
4) installers, maintainers.
At the time of publication of this European Standard, EN 50600 series will comprise the following standards:
EN 50600-1, Information technology - Data centre facilities and infrastructures - Part 1: General concepts
EN 50600-2-1, Information technology - Data centre facilities and infrastructures - Part 2-1: Building
construction
EN 50600-2-2, Information technology - Data centre facilities and infrastructures - Part 2-2: Power
distribution
EN 50600-2-3, Information technology - Data centre facilities and infrastructures - Part 2-3: Environmental
control
EN 50600-2-4, Information technology - Data centre facilities and infrastructures - Part 2-4:
Telecommunications cabling infrastructure
EN 50600-2-5, Information technology - Data centre facilities and infrastructures - Part 2-5: Security systems
EN 50600-3-1, Information technology - Data centre facilities and infrastructures - Part 3-1: Management and
operational information
The inter-relationship of the standards within the EN 50600 series is shown in Figure 1.

– 7 – EN 50600-2-4:2015
EN 50600-2-1
Building construction
EN 50600-2-2
Power distribution
EN 50600-2-3
Environmental control
EN 50600-1
General concepts
EN 50600-2-4
Telecommunications
cabling infrastructure
EN 50600-2-5
Security systems
EN 50600-3-1
Management and
operational information
Figure 1 - Schematic relationship between the EN 50600 standards
EN 50600-2-X standards specify requirements and recommendations for particular facilities and
infrastructures to support the relevant classification for “availability”, “security” and “energy efficiency
enablement” selected from EN 50600-1.
EN 50600-3-X documents specify requirements and recommendations for data centre operations, processes
and management.
This European Standard addresses the specific requirements for the telecommunications cabling
infrastructure in data centres used for the purpose of IT networking and building services (in accordance with
the requirements of EN 50600-1).
This European Standard is intended for use by and collaboration between architects, building designers and
builders, system and installation designers.
This series of European Standards does not address the selection of information technology and network
telecommunications equipment, software and associated configuration issues.

1 Scope
This European Standard addresses the wide range of telecommunications cabling infrastructures within data
centres based upon the criteria and classifications for “availability” within EN 50600-1.
This European Standard specifies requirements and recommendations for the following:
a) information technology and network telecommunications cabling (e.g. SAN and LAN);
b) general information technology cabling to support the operation of the data centre;
c) telecommunications cabling to monitor and control, as appropriate, power distribution, environmental
control and physical security of the data centre;
d) other building automation cabling;
e) pathways, spaces and enclosures for the telecommunications cabling infrastructures.
Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this European
Standard and are covered by other standards and regulations. However, information given in this European
Standard may be of assistance in meeting these standards and regulations.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 50173-1, Information technology - Generic cabling systems - Part 1: General requirements
EN 50173-2, Information technology - Generic cabling systems - Part 2: Office premises
EN 50173-5, Information technology - Generic cabling systems - Part 5: Data centres
EN 50173-6, Information technology - Generic cabling systems – Part 6: Distributed building services
EN 50174-1, Information technology - Cabling installation - Part 1: Installation specification and quality
assurance
EN 50174-2, Information technology - Cabling installation - Part 2 Installation planning and practices inside
buildings
EN 50600-1:2012, Information technology - Data centre facilities and infrastructures - Part 1: General
concepts
EN 50600-2-1, Information technology - Data centre facilities and infrastructures – Part 2-1: Building
construction
EN 50600-2-3, Information technology - Data centre facilities and infrastructures - Part 2-3: Environmental
control
1)
EN 50600-3-1 , Information technology - Data centre facilities and infrastructures - Part 3-1: Management
and operational information
———————
1)
Submitted to formal vote.
– 9 – EN 50600-2-4:2015
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50600-1 and the following apply.
3.1.1
application-specific cabling
structured cabling with a configuration and performance which is considered to provide a specific benefit for
a single, or limited number of applications, as compared to generic cabling
3.1.2
central patching location
passive cross-connect to connect different functional elements of a data centre
Note 1 to entry: A central patching location can be located in the main distribution area and/or the intermediate distribution area and is
therefore a special configuration of an MD and/or an ID.
3.1.3
cross-connect
method of connecting a patch panel port to another patch panel port by the use of a patch cord or jumper
3.1.4
data centre information technology equipment
equipment in the computer room space of a data centre that transports and/or stores and/or processes
information
3.1.5
fixed cabling
cabling subsystem between closures which has either a peer-to-peer or hierarchical structure and which
enables the installation of cross-connects or interconnects at those closures
3.1.6
generic cabling
structured telecommunications cabling system, capable of supporting a wide range of applications
Note 1 to entry: Application-specific hardware is not a part of generic cabling.
Note 2 to entry: Generic cabling can be installed without prior knowledge of the required applications.
[SOURCE: EN 50173-1:2011, 3.1.40 – modified: changed the editorial presentation of NOTES]
3.1.7
interconnect
method of connecting a patch panel port to an equipment port by the use of equipment cords
3.1.8
office network information technology equipment
equipment in data centre spaces that transports and/or stores and/or processes information
3.1.9
point-to-point connection
direct connection of two pieces of IT equipment using a dedicated cable rather than a generic cabling system
3.1.10
structured cabling
telecommunications cabling comprising fixed cables between points of distribution at which equipment or
other fixed cables may be connected

3.1.11
telecommunications provider
either an access provider or a service provider
Note 1 to entry: The term access provider is defined in EN 50174-2:2009/A2:2014, 3.1.1.
Note 2 to entry: The term service provider is defined in EN 50174-2:2009/A2:2014, 3.1.30.
3.1.12
zone patching location
passive cross-connect to connect different function elements of a data centre zone. A zone patching location
can be located in the zone distribution area and is therefore a special configuration of a ZD.
3.2 Abbreviations
For the purposes of this document, the abbreviations given in EN 50600-1 and the following abbreviations
apply.
BEF Building Entrance Facility
BD Building Distributor
C
Connection
CD Campus Distributor
CP Consolidation Point
CPL Central Patching Location
ENI External Network Interface
EO Equipment Outlet
EoR End of Row
EQP Transmission Equipment
FD Floor Distributor
ID Intermediate Distributor
LDP Local Distribution Point
MD Main Distributor
MoR Middle of Row
SCP Service Concentration Point
SD Service Distributor
SO Service Outlet
TE Terminal Equipment
TO Telecommunications Outlet
– 11 – EN 50600-2-4:2015
ToR Top of Rack
ZD Zone Distributor
ZPL Zone Patching Location
4 Conformance
For a data centre to conform to this European Standard:
a) the cabling design shall meet the requirements of Clause 5;
b) the cabling design for the selected Availability Class shall be in accordance with Clause 7;
c) the design and specifications of pathways and spaces shall be in accordance with Clauses 8
and 9;
d) the information technology cabling to support the operation of the data centre shall be in
accordance with EN 50173-2, except where 7.3 allows an alternative approach ;
e) the information technology cabling to support the IT networking function of the data centre shall be in
accordance with EN 50173-5, except where 7.2 allows an alternative approach;
f) telecommunications cabling for monitoring and/or control of power distribution, environmental control and
physical security shall be in accordance with EN 50173-6, except where 7.4 allows an alternative
approach;
g) installation specification, quality assurance, installation planning and practice of cabling shall be in
accordance with EN 50174 series and Clauses 8 and 9;
h) national and local regulations, including safety, shall be met.
5 Telecommunications cabling within the data centre
5.1 General
5.1.1 The importance of telecommunications cabling within data centre spaces
The telecommunications cabling within the data centre serves to support the following:
a) data centre information technology and network telecommunications;
b) monitoring and controlling of other data centre infrastructures;
c) building management and automation.
The design and planning of cabling infrastructures should be undertaken at an early stage of the data centre
design or refurbishment and should be integrated with the design and planning of:
1) electrical power;
2) environmental control systems;
3) security systems;
4) lighting systems.
This clause defines the requirements and recommendations for the performance, design criteria and
architectures for the different cabling types in a data centre.

The importance of the information technology and network telecommunications cabling infrastructure is
similar to that of other infrastructures such as environmental control, power distribution and security. As with
other utilities, interruptions to service can have a serious impact. Poor quality of service due to lack of
planning, use of inappropriate components, incorrect installation, poor administration or inadequate support
can threaten an organisation's effectiveness.
5.1.2 Cabling implementation
The cabling infrastructures in a data centre shall be appropriate to provide networking and
telecommunications capabilities in and between dedicated data centre spaces.
For the purposes of this standard, two types of cabling are considered for data centre spaces:
a) point-to-point;
b) fixed cabling implemented using structured cabling including the generic cabling solutions of the
EN 50173 series. The closures may be grouped and accommodated in cabinets, frames or racks
which act as cabling presentation facilities. The cabling presentation facilities allow
interconnection or cross-connections between fixed cabling or between fixed cabling and IT
equipment in close proximity.
5.1.3 Point-to-point cabling
5.1.3.1 General
The point-to-point connection method uses discrete cords (typically factory-produced) that directly connect
the active equipment. Each cord connects a single port of one device to a single port of another device.
Although point-to-point cabling seems to be the simplest and most cost effective method of providing
connections, for several reasons this cabling type should only be used for connections within the same or
two adjacent cabinets, frames or racks. Point-to-point cabling is often not reusable as the data centre
evolves and equipment types and locations change and may have a limited life time expectation. Continuous
changes to the required interconnections increase both the planning and the operational resources required
for each change (see Figure 2 and Figure 3) and increases the risk of interfering with other infrastructures -
including those for environmental control.
5.1.3.2 Restrictions on the use of point-to-point cabling
Where this standard allows point-to-point cabling, it should ony be used subject to the following restrictions:
a) the mechanical performance of cords or cables used for point-to-point connections shall meet the
requirements of the installation environment (e.g. pathway systems);
b) connectors on cords shall be protected against damage during installation, disconnection or removal;
c) point-to-point connections shall only be used where the replacement of the cord following damage to
either connector can be performed without disruption to the data centre operation;
d) cords shall be managed so as to avoid mechanical damage and/or accidental disconnection to adjacent
connections during insertion or removal;
e) cords shall be labelled at both ends to show their origin and destination in accordance with the level 3
administration requirements of EN 50174-1;
f) the impact of point to point connections on the fire load of cabling shall be assessed and mitigation
provided if necessary;
g) cords providing point-to-point connections shall not be located where they restrict cooling airflow towards
active equipment.
– 13 – EN 50600-2-4:2015
Figure 2 – Impact of growth in an unstructured point-to-point cabling infrastructure

Figure 3 – Example of point-to-point cabling
5.1.4 Fixed cabling
A structured cabling system approach, illustrated in Figure 4, shows the equipment ports presented at
remote central patching locations (CPLs). Server-to-storage connections are made using short, easily
managed, cords within the CPL. The use of distributed zone patching locations (ZPL), connected to the
CPLs with fixed cables provides additional flexibility for managing changes.
Figure 4 shows how a fixed cabling implementation isolates the change activity to the defined areas. New
equipment is connected to a CPL or ZPL without impacting active systems so no scheduled downtime is
required. The equipment can then be connected to the active systems during the scheduled downtime by
simply reconfiguring the cords at the CPL or ZPL. If a change causes a problem, it is only necessary to
reconnect the cords into their pre-change configuration. The structured approach enables more accurate
predictions of the time required to implement system changes and recovery resulting in easier, faster
changes that introduce less risk and enable improved overall system operation.
Fixed cables may have a greater minimum bending radius than cords and this shall be considered in
pathway and pathway system design and planning.

Figure 4 – Structured cabling infrastructure: setup and growth
5.2 Information technology and network telecommunications cabling in the computer room space
5.2.1 General
The cabling infrastructures in a data centre shall be appropriate to provide networking and
telecommunications capabilities in and between many of the dedicated data centres spaces. The cabling
infrastructure described in this clause is that between and within the cabinets, frames and racks which
constitute the computer room space and may take one of, or a combination of, the following forms:
a) point-to-point;
b) fixed:
1) generic - structured cabling in accordance with EN 50173-5 for IT and network
telecommunications;
2) generic - structured cabling in accordance to EN 50173-2 for IT and network
telecommunications;
3) generic - structured cabling in accordance with EN 50173-6 for monitoring and control;
4) application specific cabling.
The chosen infrastructure strategy shall take into account the need to support existing and future
networking and storage applications and significant amounts of change.
5.2.2 Generic cabling for data centre information technology equipment
Generic cabling infrastructure designs in accordance with the EN 50173 series are based upon a defined
cabling model and support the development of high data rate applications. EN 50173-5 defines generic
cabling to provide multiple services and to connect large quantities of equipment within the limited space of
data centre premises, and is to be used together with EN 50173-1.

– 15 – EN 50600-2-4:2015
Information technology cabling to support the operation of the data centre shall be in accordance with
EN 50173-5.
Figure 5 shows the cabling subsystem architecture of EN 50173-5.

Figure 5 – Data centre cabling subsystems according to EN 50173-5
Generic cabling in accordance with EN 50173-5 uses pre-defined pathways and spaces that are specifically
intended to support changing demands and provides:
a) scalability via a modular design;
b) a greater level of flexibility with equipment moves, adds and changes;
c) a level of consistency with generic cabling design methodology for other services such as power
supply distribution and environmental control;
d) the support for a wide range of applications in the data centre.
Generic cabling systems are intended to avoid the impact of the uncontrolled use of point-to-point cables
described in 5.1.3.2 by using fixed cables within defined cable pathways between panels (patch panel) at
designated patching locations. This greatly simplifies cabling modifications by managing changes at the
patching locations rather than disconnecting, moving and reconnecting discrete cables under the floor or in
ceiling spaces.
5.2.3 Generic cabling for office network information technology equipment
Information technology cabling to support the operation of the data centre shall be in accordance with
EN 50173-2.
Figure 6 shows the cabling subsystem architecture of EN 50173-2.

Figure 6 – Office cabling subsystems according to EN 50173-2

5.2.4 Generic Cabling for monitoring and control
EN 50173-6 specifies generic cabling that supports a wide range of communication services within premises.
It reflects the increasing use of generic cabling in support of non-user specific services, including the
monitoring and control of data centre infrastructures. Many of these services require the use of remote
powered devices and include:
a) energy management as described in EN 50600-2-2: e.g. lighting, power distribution, incoming
utility metering;
b) environmental control as described in EN 50600-2-3; e.g. temperature, humidity;
c) personnel management as described in EN 50600-2-5, e.g. access control, cameras, motion/
proximity detectors, time and attendance monitoring.
Cabling for these purposes shall be in accordance with EN 50173-6.
Figure 7 shows the cabling subsystem architecture of EN 50173-6.

Figure 7 – Building service cabling subsystem according to EN 50173-6
5.2.5 Application-specific fixed cabling
In cases where data centre owners agree to the use of application-specific cabling because of advantages
compared with generic cabling, those application-specific cabling systems shall have a fixed and structured
infrastructure approach in accordance with the cabling subsystem architecture of EN 50173-5 (see Figure 5).
5.3 Structured cabling for other data centre spaces and application-specific structured cabling
5.3.1 General
The cabling infrastructures in a data centre shall be appropriate to provide networking and
telecommunications capabilities in and between many of the dedicated data centres spaces. The cabling
infrastructure between and within the data centre spaces other than the computer room space shall take one
or more of the following forms:

– 17 – EN 50600-2-4:2015
a) generic – structured cabling in accordance with EN 50173-2 for IT and network telecommunications (see
5.2.3);
b) generic - structured cabling in accordance with EN 50173-6 for monitoring and control (see 5.2.4);
c) application specific (see 5.3.2).
5.3.2 Application-specific cabling using a fixed infrastructure
In cases where data centre owners agree to the use of application-specific cabling because of advantages
compared with generic cabling, those application-specific cabling systems shall have a fixed and structured
infrastructure approach in accordance with the cabling subsystem architecture of EN 50173-2 (see Figure 6).
6 Availability design principles for telecommunications cabling infrastructure
EN 50600-1:2012, Annex A, gives guidance about design principles for availability. This standard uses the
principles of:
a) redundancy;
b) maintainability;
c) scalability / future proofness and
d) simplicity.
as a basis for the design of:
1) the telecommunications cabling itself;
2) the telecommunications architecture;
3) associated pathways and spaces.
in order to achieve the desired Availability Class for the telecommunications infrastructure as described in
Clause 6.
Redundancy within the networks of the data centre shall be implemented by means of the active equipment
without the need for manual interaction. All redundancy implementations within the cabling (e.g. multi-path
routeing; Classes 3 and 4) are in support of that provided by active equipment.
7 Availability classification for telecommunications cabling infrastructure
7.1 General
This clause classifies the architecture and the redundancy concept of all telecommunications cabling
infrastructures as it relates to the chosen overall Availability Class for facilities and infrastructures of the data
centre according to EN 50600-1.
Table 1 defines the minimum requirements for all telecommunications cabling types in the different data
centre spaces to achieve the chosen overall Availability Class of the data centre as defined by EN 50600-1.
All defined Availability Classes for the different cabling types and spaces shall be met in order to achieve the
chosen overall data centre Availability Class for facilities and infrastructures.

Table 1 – Telecommunication cabling Availability Classes per space architecture and overall data centre
Availability Class for facilities and infrastructures
Data centre space Cabling type Overall data Overall data Overall data Overall data
centre facilities centre facilities centre facilities centre facilities
and and and and
infrastructure - infrastructure - infrastructure - infrastructure -
Availability Availability Availability Availability
Class 1 Class 2 Class 3 Class 4
Computer room space Inter-cabinets 7.2.1 7.2.2 7.2.3 7.2.4
Class 1 Class 2 Class 3 Class 4
Intra-cabinets 7.2.1 7.2.1 7.2.1 7.2.1
Class 1 Class 1 Class 1 Class 1
Adjacent cabinets 7.2.1 7.2.1 7.2.1 7.2.1
Class 1 Class 1 Class 1 Class 1
Monitoring and 7.4 7.4 7.4 7.4
Control
Office style cabling 7.3 7.3 7.3 7.3
Control room space Office style cabling 7.3 7.3 7.3 7.3
Monitoring and 7.4 7.4 7.4 7.4
Control
Other spaces Office Style 7.3 7.3 7.3 7.3
Monitoring and 7.4 7.4 7.4 7.4
Control
7.2 Telecommunications cabling for the computer room
7.2.1 Cabling for Availability Class 1
A telecommunications cabling infrastructure for Availability Class 1 uses either a point-to-point connection
(i.e. equipment cords) for the transmission channel (see Figure 8) or a fixed cabling infrastructure (see
Figure 9) in a single-path configuration as shown in Figure 10.

Figure 8 – Telecommunication cabling Class 1 using direct attached cords

– 19 – EN 50600-2-4:2015
CChhaannnneell
FFiixxeedd c caabblliinngg
iinnfrfraasstrtruucctuturree
CCrorossss--ccoonnnneecct at apppprrooaacchh CCrorossss--ccoonnnneecct at apppprrooaacchh
EQEQPP CC CC CC CC CC CC EQEQPP
EEqquuiippmmeennt t PPaatctchh c coorrdd// EEqquuiippmmeennt t
PPaatctchh c coorrdd//
ccoordrd JuJummpperer ccoordrd
JuJummpperer
EEqquuiippmmeennt t
EEqquuiippmmeennt t
ccoordrd
ccoordrd
EQEQPP CC CC CC CC EQEQPP
IInnteterrccoonnnneecct at apppprrooaacchh IInnteterrccoonnnneecct at apppprrooaacchh

Figure 9 – Transmission channels (interconnect and cross-connect)
The point-to-point connections shall use pre-terminated cords and shall be restricted to local connections
within the same cabinet or between adjacent cabinets, frames and racks.

TTeelleeccoommmmuunniiccaatitioonnss
pprroovviiddeerr A A
CCLLAASS 1SS 1
ENENII MDMD IDID ZZDD EOEO
TTeelleeccoommmmuunniiccaatitioonnss TTeelleeccoommmmuunniiccaatitioonnss
pprroovviiddeerr A A pprroovviiddeerr B B
CCLLAASS 2SS 2
ENENII MDMD IDID ZZDD EOEO
Figure 10 – ENI redundancy for Class 1 and 2
7.2.2 Cabling for Availability Class 2
A telecommunications cabling infrastructure for Availability Class 2 shall use a fixed cabling infrastructure
(e.g. according to EN 50173-5 or application-specific) in cabling subsystems defined in EN 50173-5 for the
transmission channel design (see Figure 9) with a single-path architecture with redundancy on the ENI as
shown in Figure 10. The pathways for the telecommunications providers shall be designed according to
Clause 8.
Furthermore, the following design criteria shall be met:
a) the design shall be flexible and scalable to allow quick moves, adds and changes by using
central and local patching/cross connect locations in MD, ID and ZD as shown in Figure 11;
b) the patching/cross-connect cabinets/frames/racks used in MD and/or ID (CPL) and ZD (ZPL)
shall offer rear cable management and side patch cord management. The design and selection
of cross-connect cabinets/frames/racks shall take into consideration the maximum planned
cabling capacity and required density inside the cabinets/frames/racks with the objective of
minimising the disruption of airflow to active equipment. One possible and preferred way of
achieving this functionality is to increase the width of the cabinets/frames/racks to offer more
space for cable and patch cords which simplifies operations for moves, adds and changes.

c) where it is intended to create channels from more than a single subsystem via cross-connects in
distributors, the selection of media and component performance shall take into account the
impact of the number of connections within, and the total length of, the channels in relation to
the applications which are intended to be supported.

Figure 11 – Managing moves, adds and changes
7.2.3 Cabling for Availability Class 3
A telecommunications cabling infrastructure for Availability Class 3 shall use a fixed cabling infrastructure
(e.g. according to EN 50173-5 or application-specific) in cabling subsystems defined in EN 50173-5 for the
transmission channel design (see Figure 9) with a multi-path redundancy configuration using diverse
physical pathways as shown in Figure 12. The pathways for the telecommunications providers shall be
designed according to Clause 8.

TTeelleeccoommmmuunniiccaatitioonnss TTeelleeccoommmmuunnccaatitioonnss
pprroovviiddeerr A A pprroovviiddeerr B B
EOEO
CCLLAASS 3SS 3
ENENII MDMD IDID ZZDD
EOEO
ENENII
PPatathhwwayay A A
PPatathhwwayay B B
TTeelleeccoommmmuunniiccaatitioonnss TTeelleeccoommmmuunniiccaatitioonnss
pprroovviiddeerr A A pprroovviiddeerr B B

Figure 12 - Redundant multipath telecommunication cabling Class 3

– 21 – EN 50600-2-4:2015
Furthermore, the following design criteria shall be met:
a) the design shall be flexible and scalable to allow quick moves, adds and changes by using
central and l
...