BS EN 61753-087-2:2011 BSI Standards Publication Fibre optic interconnecting devices and passive components — Performance standard Part 087-2: Non-connectorized single-mode bidirectional 310 nm upstream 490 nm downstream WWDM devices for category C — Controlled environment NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide™ BRITISH STANDARD BS EN 61753-087-2:2011 National foreword This British Standard is the UK implementation of EN 61753-087-2:2011 It is identical to IEC 61753-087-2:2010 The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interconnecting devices and passive components A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © BSI 2011 ISBN 978 580 64897 ICS 33.180.20 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 May 2011 Amendments issued since publication Amd No Date Text affected BS EN 61753-087-2:2011 EUROPEAN STANDARD EN 61753-087-2 NORME EUROPÉENNE March 2011 EUROPÄISCHE NORM ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Performance standard Part 087-2: Non-connectorized single-mode bidirectional 1310 nm upstream and 1490 nm downstream WWDM devices for category C Controlled environment (IEC 61753-087-2:2010) Dispositifs d'interconnexion et composants passifs fibres optiques Norme de performance Partie 087-2: Dispositifs WWDM unimodaux non connectorisés bidirectionnels 310 nm en voie montante et 490 nm en voie descendante et pour la catégorie C Environnement contrôlé (CEI 61753-087-2:2010) Lichtwellenleiter Verbindungselemente und passive Bauteile Betriebsverhalten Teil 087-2: Nicht mit Steckverbindern versehene bidirektionale 310-nmupstream-1 490-nm-downstreamEinmoden-WWDM-Bauteile für die Kategorie C Kontrollierte Umgebung (IEC 61753-087-2:2010) This European Standard was approved by CENELEC on 2011-01-13 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, Croatia, 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 Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 61753-087-2:2011 E BS EN 61753-087-2:2011 EN 61753-087-2:2011 -2- Foreword The text of document 86B/3095/FDIS, future edition of IEC 61753-087-2, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61753-087-2 on 2011-01-13 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 not be held responsible for identifying any or all such patent rights The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-10-13 – latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-01-13 Annex ZA has been added by CENELEC Endorsement notice The text of the International Standard IEC 61753-087-2:2010 was approved by CENELEC as a European Standard without any modification In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 61300-2-48 NOTE Harmonized as EN 61300-2-48 IEC 62074-1 NOTE Harmonized as EN 62074-1 -3- BS EN 61753-087-2:2011 EN 61753-087-2:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application 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 NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies Publication Year Title EN/HD Year IEC 60793-2-50 - Optical fibres Part 2-50: Product specifications - Sectional specification for class B single-mode fibres EN 60793-2-50 - IEC 61300-2-1 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-1: Tests - Vibration (sinusoidal) EN 61300-2-1 - IEC 61300-2-4 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-4: Tests - Fibre/cable retention EN 61300-2-4 - IEC 61300-2-9 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-9: Tests - Shock EN 61300-2-9 - IEC 61300-2-14 - EN 61300-2-14 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-14: Tests - Optical power handling and damage threshold characterization - IEC 61300-2-17 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-17: Tests - Cold EN 61300-2-17 - IEC 61300-2-18 - EN 61300-2-18 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-18: Tests - Dry heat - High temperature endurance - IEC 61300-2-19 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-19: Tests - Damp heat (steady state) EN 61300-2-19 - IEC 61300-2-22 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-22: Tests - Change of temperature EN 61300-2-22 - BS EN 61753-087-2:2011 EN 61753-087-2:2011 -4- Publication Year Title EN/HD Year IEC 61300-2-42 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-42: Tests - Static side load for connectors EN 61300-2-42 - IEC 61300-2-44 - EN 61300-2-44 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-44: Tests - Flexing of the strain relief of fibre optic devices - IEC 61300-3-2 - EN 61300-3-2 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-2: Examinations and measurements Polarization dependent loss in a single-mode fibre optic device - IEC 61300-3-6 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss EN 61300-3-6 - IEC 61300-3-7 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-7: Examinations and measurements Wavelength dependence of attenuation and return loss of single mode components EN 61300-3-7 - IEC 61300-3-20 - EN 61300-3-20 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-20: Examinations and measurements Directivity of fibre optic branching devices - IEC 61753-1 2007 EN 61753-1 Fibre optic interconnecting devices and passive components performance standard Part 1: General and guidance for performance standards 2007 BS EN 61753-087-2:2011 –2– 61753-087-2 Ó IEC:2010 CONTENTS FOREWORD Scope Normative references Test Test report Performance requirements 5.1 5.2 5.3 5.4 Annex A Reference components Dimensions Sample size Test details and requirements (normative) Sample size 11 Annex B (informative) General information for 1310 nm upstream and 1490 nm downstream PON WWDM device 12 Bibliography 13 Figure B.1 – Example for 490 nm downstream and 310 nm upstream WWDM at central office and customer side 12 Table – Test details and requirements Table A.1 – Sample size 11 BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 –5– FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS – PERFORMANCE STANDARD – Part 087-2: Non-connectorized single-mode bidirectional 310 nm upstream and 490 nm downstream WWDM devices for category C – Controlled environment Scope This part of IEC 61753 contains the minimum initial performance, test and measurement requirements and severities which a fibre optic pigtailed 310 nm upstream and 490 nm downstream wide wavelength division multiplexing (WWDM) passive optical network (PON) device must satisfy in order to be categorized as meeting the requirements of category C (controlled environments), as defined in Annex A of IEC 61753-1:2007 Annex B of this standard provides information concerning the function of the 310 nm upstream and 490 nm downstream WWDM Normative references The following referenced documents are indispensable for the application 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 60793-2-50, Optical fibre cables – Part 2-50: Indoor cables – Family specification for simplex and duplex cables for use in terminated cable assemblies IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-1: Tests – Vibration (sinusoidal) IEC 61300-2-4, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-4: Tests – Fibre/cable retention IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-9: Tests – Shock IEC 61300-2-14, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-14: Tests – Optical power handling and damage threshold characterization IEC 61300-2-17, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-17: Tests – Cold IEC 61300-2-18, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-18: Tests – Dry heat – High temperature endurance IEC 61300-2-19, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-19: Tests – Damp heat (steady state) IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-22: Tests – Change of temperature BS EN 61753-087-2:2011 –6– 61753-087-2 Ó IEC:2010 IEC 61300-2-42, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-42: Tests - Static side load for connectors IEC 61300-2-44, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-44: Tests – Flexing of the strain relief of fibre optic devices IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-2: Examinations and measurements – Polarization dependent loss in a single-mode fibre optic device IEC 61300-3-6, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-6: Examinations and measurements – Return loss IEC 61300-3-7, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-7: Examinations and measurements – Wavelength dependence of attenuation and return loss of single mode components IEC 61300-3-20, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-20: Examinations and measurements – Directivity of fibre optic branching devices IEC 61753-1:2007, Fibre optic interconnecting devices and passive components performance standard – Part 1: General and guidance for performance standards Test Unless otherwise specified, all test methods are in accordance with the IEC 61300 series Each test defines the number of samples to be evaluated The samples used for each test are intended to be previously unstressed new samples but may also be selected from previously used samples if desired The samples shall have pigtails of single-mode fibres as per IEC 60793-2-50 type B 1.1 or B 1.3 in either coated fibres (primary and secondary) or reinforced cable format All measurements shall be carried out at normal room conditions, unless otherwise stated All tests shall be carried out over the operating wavelength ranges of 260 nm to 360 nm, 480 nm to 500 nm, unless otherwise specified NOTE 310 nm and 490 nm are the nominal or centre wavelengths, stated for the ranges 260 nm to 360 n m and 480 nm to 500 nm as defined in ITU-T Recommendations G.983.3 and G.984.2 and IEEE standard 802.3ah-2004 Test report Fully documented test reports and supporting evidence shall be prepared and be available for inspection as evidence that the tests have been carried out and complied with 5.1 Performance requirements Reference components The testing for these components does not require the use of reference components BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 5.2 –7– Dimensions Dimensions shall comply with either an appropriate IEC interface standard or with those given in appropriate manufacturers drawings, where the IEC interface standard does not exist or cannot be used 5.3 Sample size Sample sizes for the tests are defined in Annex A of this document 5.4 Test details and requirements For test details and requirements please see Table Table – Test details and requirements No Test Insertion loss (Attenuation) IEC 61300-3-7 Requirement £ 0,8 dB Insertion loss shall be met over the operating wavelength ranges Details Launch patchcord length: Source type: ³2m Launch conditions: The wavelength of the source shall be longer than cut-off wavelength of the fibre Test results shall be obtained under measurement uncertainty of ± 0,1 dB Other requirements: Wavelength isolation IEC 61300-3-7 ³ 20 dB between wavelength ranges 260 nm to 360 nm and 480 nm to 1500 nm; Launch patchcord length: Source type: Launch conditions: Other requirements: Directivity ³ 50 dB Grade U IEC 61300-3-20 Directivity shall be met over the operating wavelength ranges Return loss ³ 50 dB Grade U IEC 61300-3-6 Return loss shall be met over the specified wavelength ranges Unpolarised ³2m Unpolarised The wavelength of the source shall be longer than cut-off wavelength of the fibre Test results shall be obtained under measurement uncertainty of ± dB Source: Laser diode (LD) Other requirements: Test results shall be obtained under measurement uncertainty of ± dB All ports not under test shall be terminated to avoid unwanted reflections contributing to the measurement The directivity shall be measured between any pair of input or output ports Source: LD Other requirements: Test results shall be obtained under measurement uncertainty of ± dB All ports not under test shall be terminated to avoid unwanted reflections contributing to the measurement BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 –8– Table (continued) No Test Polarisation Dependent Loss (PDL) IEC 61300-3-2 Requirement ³2m Other requirements: Test results shall be obtained under measurement uncertainty of ± 0,05 dB Source type LD Max power to be applied at wavelength ranges 480 nm to 500 nm and 260 nm to 360 nm: Power increments: Test duration: 300 mW ( ~ +25 dBm) Other requirements: Test results shall be obtained under insertion loss measurement uncertainty of ±0,1 dB Test results shall be obtained under return loss measurement uncertainty of ±1 dB Temperature: Duration of the exposure: Maximum sampling interval during the test: Measurements required: - 10 °C ± °C 96 h During and on completion of the test the insertion loss limits of Test No shall be met Temperature: + 60 °C ± °C Duration of the exposure: 96 h After the test the isolation limits of Test No shall be met Maximum sampling interval during the test: 1h During and on completion of the test the return loss limits of Test No shall be met Measurements required: Insertion loss shall be measured before, during and after the test Return loss shall be measured before, during and after the test Polarisation dependent loss shall be met over the specified wavelength ranges Optical power handling and damage threshold characterization ³ 300 mW (sum of power at the two wavelength ranges at the same time) IEC 61300-2-14 method During and on completion of the test the insertion loss limits of Test No shall be met After the test the isolation limits of Test No shall be met During and on completion of the test the return loss limits of Test No shall be met Cold IEC 61300-2-17 During and on completion of the test the insertion loss limits of Test No shall be met After the test the isolation limits of Test No shall be met During and on completion of the test the return loss limits of Test No shall be met Dry heat – High temperature endurance Details Launch patchcord length: Source type: £ 0,2 dB IEC 61300-2-18 LD dB 0,5 h at each power level 1h Insertion loss shall be measured before, during and after the test Return loss shall be measured before, during and after the test BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 –9– Table (continued) No Test Change of temperature IEC 61300-2-22 Requirement During and on completion of the test the insertion loss limits of Test No shall be met After the test the isolation limits of Test No shall be met During and on completion of the test the return loss limits of Test No shall be met 10 Damp heat (steady state) During and on completion of the test the insertion loss limits of Test No shall be met IEC 61300-2-19 After the test the isolation limits of Test No shall be met During and on completion of the test the return loss limits of Test No shall be met 11 Vibration After the test the insertion loss limits of Test No shall be met IEC 61300-2-1 After the test the isolation limits of Test No shall be met After the test the return loss limits of Test No shall be met 12 Shock After the test the insertion loss limits of Test No shall be met IEC 61300-2-9 After the test the isolation limits of Test No shall be met After the test the return loss limits of Test No shall be met Details High temperature:: Low temperature: Number of cycles: Rate of temperature change: Duration at extreme temperatures: Maximum sampling interval during the test: Measurements required: + 60 °C ± °C Temperature: Humidity: Duration of the exposure: + 40 °C ± °C 93 % RH + % RH, - % RH 96 h Maximum sampling interval during the test: Measurements required: 1h Frequency range: Constant vibration amplitude: Number of cycles (10 Hz - 55 Hz 10 Hz): Frequency change: Number of axes: Duration per axis: Measurements required: Acceleration force: Number of axes: Duration shock: Pulse: Number of shocks: Measurements required: - 10 °C ± °C °C/min 1h 0,5 h Insertion loss shall be measured before, during and after the test Return loss shall be measured before, during and after the test Insertion loss shall be measured before, during and after the test Return loss shall be measured before, during and after the test 10 Hz - 55 Hz 0,75 mm 15 octave/min orthogonal 0,5 h Insertion loss shall be measured before and after the test Return loss shall be measured before and after the test 500 gn main axes, perpendicular on each other ms Half sine per axis and direction (two in each direction) Insertion loss shall be measured before and after the test Return loss shall be measured before and after the test BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 – 10 – Table (continued) No 13 Test Fibre/cable retention Requirement After the test the insertion loss limits of Test No shall be met Details Magnitude of the load: IEC 61300-2-4 After the test the isolation limits of Test No shall be met After the test the return loss limits of Test No shall be met Load application point: Load rate: Duration of the load: Measurements required: 14 Flexing of the strain relief of fibre optic devices IEC 61300-2-44 After the test the insertion loss limits of Test No shall be met After the test the isolation limits of Test No shall be met After the test the return loss limits of Test No shall be met 15 Static side load After the test the insertion loss limits of Test No shall be met Magnitude of the load: Rate of load application: Load application point: Number of cycles: Measurements required: Magnitude of the load: IEC 61300-2-42 After the test the isolation limits of Test No shall be met After the test the return loss limits of Test No shall be met Load application point: Load rate: Duration of the load: Measurements required: 10 N ± N for reinforced cable 5,0 N ± 0,5 N for secondary coated fibre 2,0 N ± 0,2 N at 0,5 N/s for primary coated fibre 0,3 m from the end of device N/s for reinforced cable 0,5 N/s for coated fibre 120 s at 10 N 60 s at N and N Insertion loss shall be measured before and after the test Return loss shall be measured before and after the test 2,0 N ± 0,2 N for reinforced cable 0,5 N/s for reinforced cable 0,2 m from end of device 30 cycles Insertion loss shall be measured before and after the test Return loss shall be measured before and after the test 1,0 N ± 0,1 N for reinforced cable 0,2 N ± 0,1 N for secondary coated fibres 0,3 m from the end of device 0,5 N/s h at 1N at 0,2 N Insertion loss shall be measured before and after the test Return loss shall be measured before and after the test BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 – 11 – Annex A ( normative) Sample size Sample sizes are referred to in Table A.1 Table A.1 – Sample size Test number Test Sample size Insertion loss 12 Total channel isolation 12 Directivity 12 Return loss 12 Polarization dependent loss 12 Optical power handling and damage threshold characterization 12 Cold Dry heat - High temperature endurance Damp heat (steady state) 10 Change of temperature 11 Vibration 12 Shock 13 Fibre / c able retention 14 Flexing of the strain relief of fibre optic devices 15 Static side load BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 – 12 – Annex B (informative) General information for 1310 nm upstream and 1490 nm downstream PON WWDM device The 310 nm upstream and 490 nm downstream PON WWDM devices are used inside the PON for facilitating the transport of downstream traffic from the central office (CO) optical line terminal (OLT) with the upstream signal from the optical network unit (ONU) installed at the premises They also can be used to combine and separate the downstream and upstream traffic at the customer ONU They multiplex and demultiplex the voice and data: – 310 nm channel for Data/Voice upstream – 490 nm channel for Data/Voice downstream Figure B.1 shows an example for application of 490 nm downstream and 310 nm upstream WWDM devices at central office and customer side Transmitter (ont) Receiver (co) 310 310 PON splitter 310 490 WDM (co) 310 490 WDM (ont) 490 490 Receiver (ont) Transmitter (co) OLT ONU IEC 2820/10 Figure B.1 – Example for 490 nm downstream and 310 nm upstream WWDM at central office and customer side NOTE Typically the device in the OLT is subjected to Category C as the OLT is used inside the CO Depending whether the ONU is installed inside or outside the premis es, the devic e is subjected to either Category C or Category O BS EN 61753-087-2:2011 61753-087-2 Ó IEC:2010 – 13 – Bibliography IEC 61300-2-48, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 2-48: Tests – Temperature-humidity cycling IEC 62074-1, Fibre optic WDM devices – Part 1: Generic specification ITU-T Recommendation G.983.3, A broadband optical access system with increased service capability by wavelength allocation ITU-T Recommendation G.984.2, Gigabit-capable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specification ITU-T Recommendation G.671, Transmission characteristics of optical components and subsystems IEEE Std 802.3ah.-2004, IEEE Standard for Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements – Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications Amendment: Media Access Control Parameters, Physical Layers, and Management Parameters for Subscriber Access Networks _ This page deliberately left blank British Standards Institution (BSI) BSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions Information on standards British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 BSI provides a wide range of information on national, European and international standards through its Knowledge Centre BSI offers Members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Tel: +44 (0)20 8996 7669 Fax: +44 (0)20 8996 7001 Email: plus@bsigroup.com Buying standards You may buy PDF and hard copy versions of standards directly using a credit card from the BSI Shop on the website www.bsigroup.com/shop In addition all orders for BSI, international and foreign standards publications can be addressed to BSI Customer Services Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: orders@bsigroup.com In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Tel: +44 (0)20 8996 7004 Fax: +44 (0)20 8996 7005 Email: knowledgecentre@bsigroup.com Various BSI electronic information services are also available which give details on all its products and services Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: info@bsigroup.com BSI Subscribing Members are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsigroup.com Information regarding online access to British Standards via British Standards Online can be found at www.bsigroup.com/BSOL Further information about BSI is available on the BSI website at www.bsigroup.com/standards Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Email: copyright@bsigroup.com BSI Group Headquarters 389 Chiswick High Road London W4 4AL UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 www.bsigroup.com/standards raising standards worldwide™