BRITISH STANDARD BS EN EN 50173-5:2007 50173-5:2007 +A2:2012 +A1:2010 Incorporating Incorporating corrigendum corrigendum May 2011 May 2011 Information technology — Generic cabling systems — Part 5: Data centres ICS 33.040.50 BS EN 50173-5:2007+A2:2012 National foreword This British Standard is the UK implementation of EN 50173-5:2007+A2:2012, incorporating corrigendum May 2011 It supersedes BS EN 50173-5:2007+A1:2010, which will be withdrawn on 12 November 2015 The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CENELEC text carry the number of the CENELEC amendment For example, text altered by CENELEC amendment A1 is indicated by The start and finish of text introduced or altered by corrigendum is indicated in the text by tags Text altered by CENELEC corrigendum May 2011 is indicated in the text by The UK participation in its preparation was entrusted to Technical Committee TCT/7, Telecommunications — Installation requirements A list of organizations represented on this committee can be obtained on request to its secretary In addition to the requirements listed in subclause 1.2, conformance to BS EN 50173-5:2007 also requires the application of BS 6701 This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 © The British Standards Institution 2013 Published by BSI Standards Limited 2013 ISBN 978 580 76805 Amendments/corrigenda issued since publication Date Comments 31 March 2011 Implementation of CENELEC amendment A1:2010 31 July 2011 Implementation of CENELEC corrigendum May 2011 28 February 2013 Implementation of CENELEC amendment A2:2012 BS EN 50173-5:2007+A2:2012 EUROPEAN STANDARD EN 50173-5:2007+A1 50173-5:2007+A2 NORME EUROPÉENNE EUROPÄISCHE NORM November 2010 2012 December Incorporating corrigendum May 2011 ICS 33.040.50 English version Information technology Generic cabling systems Part 5: Data centres Technologies de l'information Systèmes de câblage générique Partie 5: Centres de données Informationstechnik Anwendungsneutrale Kommunikationskabelanlagen Teil 5: Rechenzentren This European Standard was approved by CENELEC on 2007-04-11 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 Central Secretariat 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 Central Secretariat has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels © 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 50173-5:2007 E BS EN EN50173-5:2007+A1:2010 50173-5:2007+A2:2012 BS EN 50173-5:2007+A1:2010 (E) (E) EN 50173-5:2007+A2:2012 BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) –2 - 2– –2– Foreword Foreword This European Standard was prepared by the Technical Committee CENELEC TC 215, Electrotechnical aspects of telecommunication This European Standard wasequipment prepared by the Technical Committee CENELEC TC 215, Electrotechnical aspects of telecommunication equipment The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50173-5 on 2007-04-11 The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50173-5 on 2007-04-11 The following dates were fixed: The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication – latest date by which the EN hasoftoanbeidentical implemented national standard or by endorsement (dop) 2008-05-01 at national level by publication of an identical national standard or by endorsement (dop) 2008-05-01 – latest date by which the national standards conflicting with ENby have to be (dow) 2010-05-01 – latestthe date which thewithdrawn national standards conflicting with the EN have to be withdrawn (dow) 2010-05-01 The European Standards EN 50173:1995 and EN 50173-1:2002 have been developed to enable the application-independent cabling to support and ICT EN applications in office Their basic principles, The European Standards EN 50173:1995 50173-1:2002 havepremises been developed to enable the however, are applicable to other types of applications and in other types of premises application-independent cabling to support ICT applications in office premises Their basic principles, however, are applicable to other types of applications and in other types of premises TC 215 has decided to establish relevant European Standards which address the specific requirements of these premises In order to point relevant out the commonalities of these cabling design these EN are TC 215 has decided to establish European Standards which address thestandards, specific requirements of published as individual parts the out series 50173, thus also acknowledging that standards recognize these premises In order to of point theEN commonalities of these cabling design standards,users these EN are the designation “EN 50173” synonym for 50173, genericthus cabling published as individual partsas of athe series EN alsodesign acknowledging that standards users recognize the designation “EN 50173” as a synonym for generic cabling design At the time of publication of this European Standard, series EN 50173 comprises the following standards: At the time of publication of this European Standard, series EN 50173 comprises the following standards: EN 50173-1 Information technology – Generic cabling systems – Part 1: General requirements EN 50173-2 50173-1 Information technology requirements EN Information technology – – Generic Generic cabling cabling systems systems – – Part Part 1: 2: General Office premises EN EN 50173-2 50173-3 EN 50173-3 EN 50173-4 EN EN 50173-4 50173-5 EN EN 50173-5 50173-6 Information premises Information technology technology – – Generic Generic cabling cabling systems systems – – Part Part 2: 3: Office Industrial premises Information technology technology – – Generic Generic cabling cabling systems systems – – Part Part 4: 3: Homes Industrial premises Information Information Information technology technology – – Generic Generic cabling cabling systems systems – – Part Part 4: 5: Homes Data centres Information technology – Generic cabling systems – Part 5: Data centres Information technology – Generic cabling systems – Part 6: Distributed building services Foreword to amendment A1 Foreword to amendment A1 This amendment was prepared by the Technical Committee CENELEC TC 215, Electrotechnical aspects of telecommunication equipment This amendment was prepared by the Technical Committee CENELEC TC 215, Electrotechnical aspects of telecommunication The text of the draftequipment was submitted to the formal vote and was approved by CENELEC as amendment A1 to EN onwas 2010-12-01 The50173-5:2007 text of the draft submitted to the formal vote and was approved by CENELEC as amendment A1 to EN 50173-5:2007 on 2010-12-01 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall notthat be held for identifying any or allmay suchbe patent rights of patent Attention is drawn to the possibility someresponsible of the elements of this document the subject rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights The following dates were fixed: The following dates were the fixed: – latest date by which amendment has to be implemented at national level by publication of an identical – latest date by which the amendment has to be implemented national standard or by endorsement at national level by publication of an identical (dop) 2011-12-01 national standard or the by endorsement – latest date by which national standards conflicting (dop) 2011-12-01 with the amendment have to be withdrawn – latest date by which the national standards conflicting (dow) 2013-12-01 with the amendment have to be withdrawn This standard introduces several changes in order to align the standard (dow) with the changes resulting from the 2013-12-01 introduction new Channel classes and component in with EN 50173-1:2011 Furthermore it This standardofintroduces several changes in order to alignCategories the standard the changes resulting from the introduces normative annex on theand use component of high density optical fibre hardware introductiona new of new Channel classes Categories in connecting EN 50173-1:2011 Furthermore it introduces a new normative of high density opticaltables fibre connecting hardware For the convenience of the annex readeron ofthe thisuse standard, the pertinent are reproduced in total, with grey shading of new table cells Where modifications to text apply to single expressions or a few only,grey this For the convenience of the reader of this standard, the pertinent tables are reproduced in words total, with is indicated by underlining shading of new table cells Where modifications to text apply to single expressions or a few words only, this is indicated by underlining EN 50173-5:2007/A2:2012 -2- -3- BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) ForewordForeword to amendment A2 This document (EN 50173-5:2007/A2:2012) 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 implemented at national level by publication of an identical national standard or by endorsement • latest date by which the national standards conflicting with this document have to be withdrawn (dop) 2013-11-12 (dow) 2015-11-12 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC shall not be held responsible for identifying any or all such patent rights This document introduces the intermediate distribution cabling subsystem as a new functional element to the topology of generic cabling in data centres BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) –3 - 4– - BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) Contents Introduction Scope and conformance 1.1 Scope 1.2 Conformance Normative references 10 Definitions and abbreviations .10 3.1 Definitions 10 3.2 Abbreviations 11 Structure of the generic cabling system in data centres .12 4.1 General 12 4.2 4.3 Functional elements 12 General structure and hierarchy 12 4.4 Cabling subsystems 13 4.5 4.6 Accommodation of functional elements 14 Interfaces 15 4.7 Dimensioning and configuring 15 Channel performance in data centres 18 5.1 General 18 5.2 5.3 Environmental performance 19 Transmission performance 20 Reference implementations in data centres 21 6.1 General 21 6.2 6.3 Balanced cabling 21 Optical fibre cabling 27 Cable requirements in data centres 28 7.1 General 28 7.2 Balanced cables 28 7.3 Optical fibre cables 28 Connecting hardware requirements in data centres 29 8.1 General requirements 29 8.2 Connecting hardware for balanced cabling 29 8.3 Connecting hardware for optical fibre cabling 29 Requirements for cords and jumpers in data centres 30 9.1 Jumpers 30 BS EN 50173-5:2007+A1:2010 –4– EN (E) 9.2 50173-5:2007+A1:2010 Balanced cords 30 9.3 Optical fibre cords 30 BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) -5–4– BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) Annex A (normative) Link performance limits 31 9.3 Optical fibre cords 29 Annex A performance limitsconnecting 30 Annex B (normative) (normative) Link Usage of high density hardware within optical fibre cabling 32 Annex B of high distribution density connecting within optical fibre cabling 34 31 Annex C (normative) (normative) Usage Intermediate cablinghardware subsystem Bibliography 33 Bibliography 44 BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) Figures –4– Figure - Schematic relationship between the EN 50173 series and other relevant standards 9.3 Optical fibre cords 13 29 Figure - Structure of generic cabling .12 Annex performance 30 13 Figure 3A- (normative) HierarchicalLink structure of genericlimits cabling 12 Figure Example of Usage accommodation of functional elements 14 Annex 4B- (normative) of high density connecting hardware within optical fibre cabling 15 31 16 Figure - Test and equipment interfaces 15 Bibliography 33 17 Figure - Connection of functional elements providing redundancy 16 Figures 17 Figure - The External Network Interface 16 19 Figure a channel 18 Figure Example Schematicofrelationship between the EN 50173 series and other relevant standards 19 Figure Example systemcabling showing the location of cabling interfaces 18 Figure Structure of of ageneric .12 23 Figure 10- -Hierarchical Zone distribution cabling modelscabling 22 Figure structure of generic 12 24 Figure 11- –Example Main distribution cabling model 23 Figure of accommodation of functional elements 14 26 Figure Network access cabling model 15 .25 Figure 12 - -Test and equipment interfaces 31 Figure - Link options 30 Figure A.1 - Connection of functional elements providing redundancy 16 33 Figure B.1 - Examples high density connecting hardware within main distribution cabling .32 Figure - The Externalof Network Interface 16 Figure B.2 - Examples of high density connecting hardware at the LDP and EO within zone Figure - Example of a channel 18 33 distribution cabling 32 Figure - Example of a system showing the location of cabling interfaces 18 Figure C.1 – Structure of generic cabling 35 Tables Figure 10 - Zone distribution cabling models 22 Figure C.2 – Hierarchical structure of generic cabling 35 Figure 11 – Main distribution cabling model 23 Table 1C.3 - Contextual between of ENfunctional 50173 series and other relevant standards Figure – Examplerelationship of accommodation elements 36 Figure 12 - Network access cabling model .25 Table 2C.4 - Zone distribution channel length equations .21 Figure – Test and equipment interfaces .37 Figure A.1 - Link options 30 Table 3C.5 - Main distribution channel lengthelements equations 24 Figure – Connection of functional providing redundancy 38 Figure B.1 - Examples of high density connecting hardware within main distribution cabling .32 Table 4C.6 - Network access cabling channelcabling length model equations 26 Figure – Intermediate distribution 39 Figure B.2 - Examples of high density connecting hardware at the LDP and EO within zone Table 5C.7 - Optical fibre channel length equations .27 Figure – Main cabling model 41 distribution cabling distribution 32 Tables Table - Contextual relationship between EN 50173 series and other relevant standards 22 Table - Zone distribution channel length equations .21 25 Table - Main distribution channel length equations 24 27 Table - Network access cabling channel length equations 26 28 Table - Optical fibre channel length equations .27 Table C.1 – Intermediate distribution channel equations 40 Table C.2 – Main distribution channel equations 42 Table C.3 – Optical fibre channel parameters 43 BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) –5 - 6– - BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) Introduction The importance of the information technology cabling infrastructure is similar to that of other utilities such as heating, lighting and electricity supplies As with other utilities, interruptions to service can have 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 Cabling within data centres comprises both application-specific and multipurpose networks that are missioncritical to the enterprise Generic cabling designs in accordance with the EN 50173 series have supported the development of high data rate applications based upon a defined cabling model This European standard recognizes the benefit of generic cabling to provision multiple services and to connect large quantities of equipment within the limited space of data centre premises, and is to be used in conjunction with EN 50173-1 This European Standard, EN 50173-5, provides: a) users with an application independent generic cabling system and an open market for cabling components; b) requirements for infrastructures that support critical applications within data centres; c) a flexible cabling scheme such that modifications are both easy and economical; d) a scaleable structure to support expansion with minimum operational disruption; e) building professionals (for example, architects) with guidance allowing the accommodation of cabling before specific requirements are known; i.e in the initial planning either for construction or refurbishment; f) industry and standardisation bodies with a cabling system which supports current products and provides a basis for future product development and applications standardisation This European Standard specifies multi-vendor cabling, and is related to: - the associated standard covering general requirements for generic cabling within premises (EN 50173-1); - standards for cabling components developed by Technical Committees of CENELEC and/or IEC; - standards for the quality assurance and installation of information technology cabling (series EN 50174) and testing of installed cabling (EN 50346); - applications developed by the technical committees of IEC (including the subcommittees of ISO/IEC JTC 1) and study groups of ITU-T It is anticipated that the generic cabling system meeting the requirements of this European Standard will have a life expectancy in excess of ten years BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) –6– BS EN 50173-5:2007+A2:2012 BS EN 50173-5:2007+A1:2010 – 6- 7– EN 50173-5:2007+A1:2010 (E) EN 50173-5:2007+A2:2012 (E) Figure and Table show the schematic and contextual relationships between the standards produced by TC 215 for information technology cabling, namely Figure and Table show the schematic and contextual relationships between the standards produced by 1) thisfor and other partstechnology of the EN cabling, 50173 series; TC 215 information namely 2) 1) application dependent cabling designseries; (e.g EN 50098 series); this and other parts of the EN 50173 3) 2) - 350098 installation 50174 series); application (EN dependent cabling design (e.g EN series); 4) 3) testing of installed cabling (EN 50346); installation (EN 50174 series); EN 50173-5:2007/A2:2012 5) equipotential bonding requirements (EN 50310) 4) testing of installed cabling (EN 50346); Foreword !5) In addition, a number of Technical Reports have been developed to support or extend the application of equipotential bonding (EN 50310) Add following including after EN requirements 50173-5: thesethe standards, ! In addition, a number of Technical Reports have been developed to support or extend the application of EN 50173-6 50173-99-1, Information technologyin– support Genericof cabling systems – Part 6: Distributed building - CLC/TR Cabling guidelines 10 GBASE-T, these standards, including services - CLC/TR 50173-99-2, Information technology – Implementation of BCT applications using cabling in - CLC/TR 50173-99-1, Cabling guidelines in support of 10 GBASE-T, accordance with EN 50173-4 Introduction - CLC/TR 50173-99-2, Information technology – Implementation of BCT applications using cabling in accordance with EN 50173-4 EN 50098-1: Customer premises EN 50173-2: Information technology: Replace Figure technology by the- following figure: cabling for information Generic cabling - Office premises ISDN basic access EN 50098-1: Customer premises EN 50098-1: Customer premises EN 50098-2: Customer premises cabling technology for information cabling for information technology cabling for information technology ISDN basic access ISDN2048 basickbit/s access ISDN primary access and EN 50098-2: Customer premises EN 50098-2: premises leased line Customer network interface cabling forfor information technology - cabling information technology 2048 kbit/s ISDN primary access andand 2048 kbit/s ISDN primary access leased line network interface leased line network interface EN 50173-3: Information technology: EN 50173-2: Information technology: EN 50173-2:Generic Information technology: cabling - Industrial premises Generic cabling - Office premises Generic cabling - Office premises EN 50173-4: Information technology: EN 50173-3: Information technology: EN 50173-3: Information technology: Generic cabling - Homes Generic- Industrial cabling - premises Industrial premises Generic cabling EN 50173-5:technology: Information technology: EN 50173-4: Information EN 50173-4: Information technology: Generic cabling - Data centres Generic cabling Homes Generic cabling - Homes EN 50173-1: Information technology: Generic cabling - General requirements EN 50173-1: Information technology: EN 50173-1: Information technology: GenericGeneric cabling cabling - General requirements - General requirements EN 50173-5: Information technology: EN 50173-5: Information technology: Generic cabling - Data centres Generic cabling - Data centres EN 50173-6: Information technology: Generic cabling – Distributed building services EN 50174-1: Information technology – Cabling installation – Installation specification and quality assurance 50174-1: Information technology – ENEN 50174-1: Information technology Cabling installation - Specification and Cabling installation – Installation quality assuranceand quality assurance specification EN 50310: Application of equipotential bonding and earthing in buildings with information technology equipment EN 50310: Application of equipotential bonding and earthing in buildings with information technology equipment EN 50174-2: Information technology Cabling installation - Installation planningInformation and practices inside buildings EN 50310: Application of equipotential EN 50174-2: technology EN installation 50174-2: Information Cabling - Installationtechnology - bonding and earthing in buildings with planning and installation practices inside buildings information technology equipment Cabling - Installation planning and practices inside buildings EN 50174-3: Information technology Cabling installation - Installation EN 50174-3: Information technology planning and practices outside buildings Cabling installation - Installation EN 50174-3: Information planning and practices outside technology buildings Cabling installation - Installation planning and practices outside buildings EN 50346: Information technology Cabling installation EN 50346: Information technology Testing of installed cabling Figure - Cabling installation Testing of installed cabling EN 50346: Information technology Cabling installation Schematic relationship between Testing of installed cabling the EN 50173 series and other relevant standards Figure – Schematic relationship between the EN 50173 series and other relevant standards" Figure – Schematic relationship between the EN 50173 series and other relevant standards" BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) – 30 - 31– - Annex A (normative) Link performance limits A.1 General This annex contains performance requirement formulae for permanent links and local distribution point (LDP) links as shown in Figure A.1 and relates to ˆEN 50173-1:2011‰ , Annex A The cabling under test in Configurations A and B is termed the permanent link: a) Configuration A comprises fixed cabling only b) Configuration C comprises fixed cabling and a LDP cable Measurements made for this configuration are invalid if the LDP cable is changed The cabling under test in Configuration D contains fixed cabling only and is termed the LDP link In all configurations the test configuration reference plane of a link is within the test cord next to, and including, the test cord connection which mates to the termination point of the link under test ! Network access/ main distribution/ zone distribution cabling Tester Zone distribution cabling Tester C C C Configuration A C Tester Configuration C PP/ENI/EO PP C C Tester C PP C C LDP EO Permanent link Zone distribution cabling Tester C C C C Tester Configuration D LDP PP LDP link Figure A.1 – Link options " A.2 Balanced cabling A.2.1 General Consideration should be given to measuring performance at worst case temperatures, or calculating worst case performance based on measurements made at other temperatures A.2.2 Requirements Link performance shall meet the requirement of ˆEN 50173-1:2011‰, A.1 A.3 Optical fibre cabling Link performance shall meet the requirements of ˆEN 50173-1:2011‰, A.3.1 BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) – 31 - 32– - BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) ! Annex B (normative) Usage of high density connecting hardware within optical fibre cabling B.1 General For the purposes of this annex, the term “high density connecting hardware” refers to optical fibre connecting hardware that provides interconnection: a) of multi-element cabling (more than two optical fibres); b) at a greater density than is possible using groups of the duplex optical fibre interface as specified at the EO (see Clause 8); c) through a transition assembly, or a fan-out cord High density connecting hardware may be required in the following locations: 1) interfaces to switchblades for high density switches; 2) interfaces to equipment using parallel optics sources and detectors; 3) one or both ends of equipment cords at distributors; 4) one or both ends of patch cords at distributors; 5) at LDPs; 6) interfaces that replace duplex EO connectors B.2 Structure of cabling subsystems Examples of high density connecting hardware within cabling subsystems in accordance with Clause are shown in Figure B.1 (main distribution cabling) and Figure B.2 (zone distribution cabling) B.3 Channel performance In order to conform to this standard the channel performance shall meet the requirements specified in Clause Channel attenuation requirements of Classes OF-300, OF-500 and OF-2000 as specified in EN 50173-1 are based on a total insertion loss allocation of 1,5 dB for connecting hardware for channels of length 300 m, 500 m and 000 m respectively Using connecting hardware that is minimally compliant with the performance specified in EN 50173-1 limits the number of connections within the channel to two where the channels are of maximum length The use of connecting hardware having attenuation performance that exceeds the requirements of EN 50173-1 and/or the implementation of shorter channels may allow the required channel performance to be achieved using additional connections and splices Figure B.1 and Figure B.2 show a number of implementations that include more than two connections High density connecting hardware may be manufacturer- and application- specific The connecting hardware transmission performance as specified in Clause and/or the required channel performance of Clause may not be achievable In such cases it should be verified that the channel performance meets the requirements of the application (see ˆEN 50173-1:2011‰ , Annex F)." BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) – 32 - 33– - ! MD C H = high density connecting hardware C EQP C C C H H C C C C C Equipment cord ZD C Transition assembly Transition assembly H H H H H EQP High density equipment cord MD H H ZD High density equipment cord EQP EQP Equipment cord ZD EQP C ZD H H H EQP Channel Figure B.1 – Examples of high density connecting hardware within main distribution cabling H = high density connecting hardware C C EO C H C EQP C EQP C C Transition assembly Equipment cord C C H EO C C LDP C LDP cable Equipment cord EO H LDP cable EO High density equipment cord H H H EQP H EQP LDP Figure B.2 – Examples of high density connecting hardware at the LDP and EO within zone distribution cabling" -5- BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) EN 50173-5:2007/A2:2012 - 34 - Insert the following new Annex C Annex C (normative) Intermediate distribution cabling subsystem C.1 General Larger data centres may require an additional subsystem in order to support a reasonable administration system that will allow for the interconnection of several main distributors In such case the main distributor will become the common distributor, which now connects several intermediate distributors, which act as local main distributors This annex defines the additional requirements that are required for such implementations C.2 C.2.1 Structure Functional elements In addition to the distributors specified in 4.1, Annex C specifies the following functional element and interface of generic cabling: – intermediate distributor (ID) C.2.2 General structure and hierarchy Generic cabling systems in accordance with this annex contain an additional cabling subsystem: the intermediate distribution cabling subsystem Network access cabling subsystems may be connected directly to the intermediate distributor The cabling subsystems are connected together to create a generic cabling system with a structure as shown in Figure C.1 The composition of the intermediate distribution cabling subsystem is described in C.2.3 The functional elements of the cabling subsystems are interconnected to form a basic hierarchical topology as shown in Figure C.2 Where the functions of distributors are combined (see 4.7.1) the cabling subsystems linking them are not required Connection to application-specific equipment at an ID adopts an interconnect or a cross-connect approach (see EN 50173-1) Passive connections between cabling subsystems adopt either a cross connect approach, by way of either patch cords or jumpers, or an interconnect approach BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) - 35 -6- EN 50173-5:2007/A2:2012 ENI MD ID LDP ZD EO EQP Distributor in accordance with EN 50173-1 Main distribution cabling subsystem Network access cabling subsystem Intermediate distribution cabling subsystem Zone distribution cabling subsystem Equipment cabling Generic cabling system Figure C.1 – Structure of generic cabling Distributor in accordance with EN 50173-1 ENI ENI Network access cabling subsystem Network access cabling subsystem MD Main distribution cabling subsystem ID ZD ZD Intermediate distribution cabling subsystem ID Zone distribution cabling subsystem LDP EO EO LDP EO EO LDP EO EO EO LDP EO EO ZD LDP EO EO EO LDP EO EO LDP EO EO EO Zone distribution cabling subsystem ZD LDP EO EO EO optional cables NOTE Network access cabling is also used to connect distributors in accordance with EN 50173-1 to the ID Figure C.2 – Hierarchical structure of generic cabling BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) C.2.3 C.2.3.1 - 36 -7- EN 50173-5:2007/A2:2012 Cabling subsystems Main distribution cabling subsystem The main distribution cabling subsystem extends from an MD to the IDs connected to it The subsystem includes a) the main distribution cables, b) the mechanical termination of the main distribution cables at the MD together with associated patch cords and/or jumpers at the MD, c) the mechanical termination of the main distribution cables at the ID Although equipment cords are used to connect the transmission equipment to the cabling subsystem, they are not considered part of the main distribution cabling subsystem because they are applicationspecific C.2.3.2 Intermediate distribution cabling subsystem The intermediate distribution cabling subsystem extends from an ID to the ZDs connected to it The subsystem includes a) the intermediate distribution cables, b) the mechanical termination of the intermediate distribution cables at the ID together with associated patch cords and/or jumpers at the ID, c) the mechanical termination of the intermediate cables at the ZD Although equipment cords are used to connect the transmission equipment to the cabling subsystem, they are not considered part of the intermediate distribution cabling subsystem because they are application-specific C.2.4 Accommodation of functional elements Figure C.3 shows an example of how the intermediate distributor is accommodated in a building (only a single floor of the building is shown for simplicity) The ID shall be housed in permanent and accessible locations within the data centre Equipment/telecommunications room in accordance with EN 50173-1 Distributor in accordance with EN 50173-1 Data centre BEF ENI MD ID EO ZD LDP Figure C.3 – Example of accommodation of functional elements - 37 -8- EN 50173-5:2007/A2:2012 C.2.5 BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) Interfaces Potential equipment interfaces and test interfaces for the intermediate distribution cabling subsystem are located as shown in Figure C.4 EI EI EI EI ZD ID EQP C C TI EI C C TI TI a) Intermediate distribution cabling EI EI C TI EQP TI EI ID MD EQP C C C C C TI TI b) C C EQP TI Main distribution cabling Figure C.4 – Test and equipment interfaces C.2.6 Dimensioning and configuring Figure C.5 shows one of many possible examples of the connection of functional elements within the structured framework to provide such protection against failure in one or more parts of the cabling infrastructure This might form the basis for the design of generic cabling for a data centre providing some protection against such hazards as fire damage or the failure of the external network feeder cable BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) - 38 -9- EN 50173-5:2007/A2:2012 ENI ENI MD MD ID ID ZD ZD LDP LDP Distributor in accordance with EN 50173-1 EO EO EO EO EO EO EO EO EO EO EO EO Figure C.5 – Connection of functional elements providing redundancy C.3 C.3.1 Channel performance in data centres General Channels are implemented using a) network access cabling only, b) main distribution cabling only, c) intermediate distribution cabling only, d) zone distribution cabling only, e) combinations of the above C.3.2 Transmission performance – Balanced cabling The intermediate distribution cabling shall be designed to provide a channel performance as required from Class EA or higher as specified in EN 50173-1:2011, taking into consideration the requirements for application support over the lifetime of the cabling In the case of cable sharing, additional requirements shall be taken into account for balanced cabling The additional crosstalk requirements are specified in 7.2 EN 50173-5:2007/A2:2012 C.4 BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) - 39 - 10 - Reference implementations in data centres C.4.1 General This clause describes implementations of generic cabling that utilise components referenced in Clauses 7, and These reference implementations meet the requirements of Clause and, when installed in accordance with EN 50174 series of standards, meet the channel transmission performance requirements of 5.3 when subjected to the relevant environmental classifications of 5.2 To ensure the integrity of the environmental performance of the cabling components, compatibility between cabling components shall be assured by design and in accordance with EN 50174-1 C.4.2 Balanced cabling C.4.2.1 Intermediate distribution cabling C.4.2.1.1 Component choice The selection of balanced cabling components will be determined by the Class of applications to be supported by the cabling Refer to EN 50173-1:2011, Annex F, for guidance Using the models of C.4.2.1.2: a) Category 6A components provide Class EA balanced cabling performance; b) Category components provide Class F balanced cabling performance; c) Category 7A components provide Class FA balanced cabling performance Cables and connections of different Categories may be mixed within a channel however the resultant cabling performance will be determined by the Category of the lowest performing component C.4.2.1.2 Dimensions Figure C.6 shows the models used to correlate intermediate distribution cabling dimensions specified in this Clause with the channel specifications in Clause Channel Intermediate distribution cable ID EQP ZD C C Equipment cord C Patch cord/ Jumper C C Patch cord/ Jumper C EQP Equipment cord Figure C.6 – Intermediate distribution cabling model The connection of application-specific equipment to the intermediate distribution cabling at the ID and ZDs adopts either an interconnect or cross-connect approach (see EN 50173-1) The channel includes cords comprising patch and equipment cords For the purposes of this subclause, jumpers used in place of patch cords are treated as cords In order to accommodate cables used for patch cords, jumpers and equipment cords with different insertion loss specifications, the length of the cables used within a channel shall be determined by the equations shown in Table C.1 BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) - 40 - 11 - EN 50173-5:2007/A2:2012 In Table C.1, it is assumed that a) the flexible cable within these cords has a higher insertion loss specification than that used in the main distribution cable (see Clause 9), b) the cables within these cords in the channel have a common insertion loss specification The following general restrictions apply: 1) the physical length of the channel shall not exceed 100 m; 2) the physical length of the intermediate distribution cable shall not exceed 90 m and may be less depending on the length of cords used and the number of connections; 3) when four connections are used in a channel, the physical length of the intermediate distribution cable should be at least 15 m NOTE Channel and permanent links performance requirements are based on assumptions regarding minimum length and insertion loss of cords The maximum length of the intermediate distribution cable will depend on the total length of cords to be supported within a channel During the operation of the installed cabling, a management system should be implemented to ensure that the cords used to create the channel conform with the design rules for the data centre Table C.1 - Intermediate distribution channel equations Model Implementation equations Class EA a Class F a Class FA Interconnect – interconnect I = 107 – – F×X I =107 – – F×X I =107 – 2a – F×X Interconnect – cross-connect I = 106 – 3a – F×X I =106 – 3a – F×X I =106 – 3a – F×X Cross-connect – cross-connect I =105 – 3a – F×X I =105 – 3a – F×X I =105 – 3a – F×X I maximum length of the intermediate distribution cable (m) F combined length of patch cords, jumpers and equipment cords (m) X ratio of flexible cable insertion loss (dB/m) to intermediate distribution cable insertion loss (dB/m) – see Clause NOTE For operating temperatures above 20 °C, I should be reduced by 0,2 % per °C for screened cables and 0,4 % per °C (20 °C to 40 °C) and 0,6 % per °C (> 40 °C to 60 °C) for unscreened cables Manufacturers’/suppliers’ information shall be consulted where the intended operating temperature exceeds 60 °C a This length reduction is to provide an allocated margin to accommodate insertion loss deviation C.4.2.2 Main distribution cabling C.4.2.2.1 Component choice See 6.2.3.1 C.4.2.2.2 Dimensions Figure C.7 shows the models used to correlate main distribution cabling dimensions specified in this clause with the channel specifications in Clause EN 50173-5:2007/A2:2012 - 41 - 12 - Channel BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) Main distribution cable MD EQP ID C C Equipment cord C Patch cord/ Jumper C C Patch cord/ Jumper C EQP Equipment cord Figure C.7 – Main distribution cabling model The connection of application-specific equipment to the main distribution cabling at the MD and IDs adopts either an interconnect or cross-connect approach (see EN 50173-1) The channel includes cords comprising patch and equipment cords For the purposes of this subclause, jumpers used in place of patch cords are treated as cords In order to accommodate cables used for patch cords, jumpers and equipment cords with different insertion loss specifications, the length of the cables used within a channel shall be determined by the equations shown in Table C.2 In Table C.2 it is assumed that a) the flexible cable within these cords has a higher insertion loss specification than that used in the main distribution cable (see Clause 9), b) the cables within these cords in the channel have a common insertion loss specification The following general restrictions apply: 1) the physical length of the channel shall not exceed 100 m; 2) the physical length of the main distribution cable shall not exceed 90 m and may be less depending on the length of cords used and the number of connections; 3) when four connections are used in a channel, the physical length of the main distribution cable should be at least 15 m NOTE Channel and permanent links performance requirements are based on assumptions regarding minimum length and insertion loss of cords The maximum length of the main distribution cable will depend on the total length of cords to be supported within a channel During the operation of the installed cabling, a management system should be implemented to ensure that the cords used to create the channel conform with the design rules for the data centre BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) - 42 - 13 - EN 50173-5:2007/A2:2012 Table C.2 – Main distribution channel equations Model Implementation equations Class EA Class F Class FA Interconnect – interconnect M =107 – 3a – F×X M =107 – 2a – F×X M =107 – 2a – F×X Interconnect – cross-connect M =106 – 3a – F×X M =106 – 3a – F×X M =106 – 3a – F×X Cross-connect – cross-connect M =105 – 3a – F×X M =105 – 3a – F×X M =105 – 3a – F×X M maximum length of the main distribution cable (m) F combined length of patch cords, jumpers and equipment cords (m) X ratio of flexible cable insertion loss (dB/m) to main distribution cable insertion loss (dB/m) – see Clause NOTE For operating temperatures above 20 °C, M should be reduced by 0,2 % per °C for screened cables and 0,4 % per °C (20 °C to 40 °C) and 0,6 % per °C (> 40 °C to 60 °C) for unscreened cables Manufacturers’/suppliers’ information shall be consulted where the intended operating temperature exceeds 60 °C a This length reduction is to provide an allocated margin to accommodate insertion loss deviation C.4.3 Optical fibre channel lengths – Main and intermediate distribution cabling channel lengths The models of Figure C.6 and Figure C.7 are applicable to optical fibre cabling for intermediate distribution cabling and main distribution cabling It should be noted that the connection systems used to terminate fixed optical cabling may contain mated connections and splices (permanent or re-useable) and that cross-connects may comprise re-useable splices In order to accommodate differing quantities of mated connections and splices of the cables used within a channel of a given Class (see Clause 5), the total channel length shall be determined by the equations shown in Table C.3 The number and overall attenuation of connections and splices may be restricted by application standards BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) - 43 - 14 - EN 50173-5:2007/A2:2012 Table C.3 – Optical fibre channel parameters Cabled optical fibre Class Implementation equations Category Wavelength Multimode OM3/OM4 850 nm OS2 Maximum length m OF-100 L = 535 - 214x – 90y L = 100 - 500x – 200y 100 OF-300 L = 735 - 214x – 90y L = 300 - 500x – 200y 300 OF-500 L = 935 - 214x – 90y L = 500 - 500x – 200y 500 OF-2000 L = 435 - 214x – 90y L = 000 - 500x – 200y 000 Singlemode OS1 300 nm 310 nm 550 nm OF-300 L = 800 - 750x – 300y L = 800 - 750x – 300y 300 OF-500 L = 000 - 750x – 300y L = 000 - 750x – 300y 500 OF-2000 L = 500 - 750x – 300y L = 500 - 750x – 300y 000 OF-300 L=4 500 – 875x – 750 y L=4 500 – 875x – 750 y 300 OF-500 L=5 000 – 875x – 750y L=5 000 – 875x – 750y 500 OF-2000 L=8 750 – 875x – 750y L=8 750 – 875x – 750y 000 OF-5000 L=10 000 – 875x – 750y L=10 000 – 875x – 750y 000 OF-10000 L=15 000 – 875x – 750y L=15 000 – 875x – 750y 10 000 L = the length of the channel (m) x = total number of mated connections in the channel y = total number of splices in the channel C.5 Cable requirements The minimum requirements for cables installed in the intermediate cabling subsystems are specified in 7.2 and 7.3 C.6 Connecting hardware requirements The minimum requirements for connecting hardware installed at the ID are specified in 8.2 and 8.3 C.7 Cord and jumper requirements The minimum requirements for cord and jumpers installed at the ID are specified in 9.2 and 9.3 C.8 Link performance limits The Configuration A of Figure A.1 is applicable to intermediate cabling BS EN 50173-5:2007+A2:2012 EN 50173-5:2007+A2:2012 (E) –- 15 33 - 44–- – 33 – BS EN 50173-5:2007+A1:2010 50173-5:2007/A2:2012 ENEN 50173-5:2007+A1:2010 (E) BS EN 50173-5:2007+A1:2010 EN 50173-5:2007+A1:2010 (E) Bibliography Add the following reference: Bibliography Bibliography EN 50098-1+A1:2002, 50173-6 1), Information technology Generic systems – Part –6: Distributed building EN Customer premises– cabling forcabling Information Technology Part 1: ISDN basic access services EN 50098-1+A1:2002, 50098-2, CustomerCustomer premisespremises cabling cabling for Information Technology – Part– 2: 2048 kbit/sbasic ISDN primary for Information Technology Part 1: ISDN access access and leased line network interface EN 50098-2, Customer premises cabling for Information Technology – Part 2: 2048 kbit/s ISDN primary !EN access and leased line network interfacetechnology – Generic cabling systems – Part 2: Office premises 50173-2:2007+A1:2010, Information !EN 50173-2:2007+A1:2010, premises 50173-3:2007+A1:2010, Information technology – Generic cabling systems – Part 2: 3: Office Industrial premises 50173-3:2007+A1:2010, Information technology – Generic cabling systems – Part 3: EN 50173-4:2007+A1:2010, 4: Industrial Homes "premises 1) EN 50310, 50173-6Application , Information technology – bonding Generic cabling systems Part 6: Distributed building services 50173-4:2007+A1:2010, Information technology – Generic cabling systems –with Part 4: Homes "technology of equipotential and earthing in –buildings information equipment EN 50310, Application of equipotential bonding and earthing in buildings with information technology !EN 50346:2002+A1:2007+A2:2009, Information technology – Cabling installation – Testing of installed cabling " equipment !EN 50346:2002+A1:2007+A2:2009, 60603-7-7, Connectors for electronic equipment – Part–7-7: Detailinstallation specification for 8-way, shielded, free" Information technology Cabling – Testing of installed cabling and fixed connectors, for data transmission with frequencies up to 600 MHz (IEC 60603-7-7:2006) EN 60603-7-7, Connectors for electronic equipment – Part 7-7: Detail specification for 8-way, shielded, free EN Connectors for electronic requirements - Part 3-104: Detail and61076-3-104, fixed connectors, for data transmission with equipment frequencies -upProduct to 600 MHz (IEC 60603-7-7:2006) specification for 8-way, shielded free and fixed connectors for data transmissions with frequencies up to EN 61076-3-104, Connectors for electronic equipment - Product requirements - Part 3-104: Detail 000 MHz (IEC specification for 61076-3-104:2006) 8-way, shielded free and fixed connectors for data transmissions with frequencies up to !1 CLC/TR 50173-99-1, Cabling guidelines in support of 10 GBASE-T 000 MHz (IEC 61076-3-104:2006) !CLC/TR CLC/TR 50173-99-2, 50173-99-1, Cabling guidelines in support of 10 GBASE-T of BCT applications using cabling in Information technology – Implementation accordance with EN 50173-4 CLC/TR 50173-99-2, Information technology – Implementation of BCT applications using cabling in accordance with EN 50173-4 for electronic equipment – Part 7-71: Detail specification for 8-way, shielded, EN 60603-7-71, Connectors free and fixed connectors, for data transmission with frequencies up to 000 MHz (IEC 60603-7-71)" EN 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 000 MHz (IEC 60603-7-71)" ——————— 1) Approved for formal vote. blank