BS EN 61753-071-2:2014 BSI Standards Publication Fibre optic interconnecting devices and passive components — Performance standard Part 071-2: Non-connectorised single-mode fibre optic x and x spatial switches for category C — Controlled environments BRITISH STANDARD BS EN 61753-071-2:2014 National foreword This British Standard is the UK implementation of EN 61753-071-2:2014 It is identical to IEC 61753-071-2:2014 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 © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 71132 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 August 2014 Amendments/corrigenda issued since publication Date Text affected BS EN 61753-071-2:2014 EUROPEAN STANDARD EN 61753-071-2 NORME EUROPÉENNE EUROPÄISCHE NORM July 2014 ICS 33.180.20 English Version Fibre optic interconnecting devices and passive components Performance standard - Part 071-2: Non-connectorized singlemode fibre optic × and × spatial switches for category C Controlled environments (IEC 61753-071-2:2014) Dispositifs d'interconnexion et composants passifs fibres optiques - Norme de performance - Partie 071-2: Commutateurs spatiaux optiques unimodaux × et × non connectorisés pour la catégorie C - Environnements contrôlés (CEI 61753-071-2:2014) Lichtwellenleiter - Verbindungselemente und passive Bauteile - Betriebsverhalten - Teil 071-2: Nicht mit Steckverbindern versehene räumliche x und x Einmodenschalter für die Kategorie C - Kontrollierte Umgebung (IEC 61753-071-2:2014) This European Standard was approved by CENELEC on 2014-06-17 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 © 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 61753-071-2:2014 E BS EN 61753-071-2:2014 EN 61753-071-2:2014 -2- Foreword The text of document 86B/3748/FDIS, future edition of IEC 61753-071-2, 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 approved by CENELEC as EN 61753-071-2:2014 The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-03-17 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-06-17 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 Endorsement notice The text of the International Standard IEC 61753-071-2:2014 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 61300-3-3 NOTE Harmonised as EN 61300-3-3 IEC 61300-3-4 NOTE Harmonised as EN 61300-3-4 IEC 61300-3-6 NOTE Harmonised as EN 61300-3-6 IEC 62343-2 NOTE Harmonised as EN 62343-2 BS EN 61753-071-2:2014 EN 61753-071-2:2014 -3- Annex ZA (normative) Normative references to international publications with their corresponding European publications 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 NOTE When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies NOTE Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60876-1 - Fibre optic interconnecting devices and passive components - Fibre optic spatial switches Part 1: Generic specification Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-1: Tests - Vibration (sinusoidal) Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-4: Tests - Fibre/cable retention Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-9: Tests - Shock Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-14: Tests - High optical power Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-17: Tests - Cold Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-18: Tests - Dry heat - High temperature endurance Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-19: Tests - Damp heat (steady state) Basic test and measurement procedures Part 2-22: Tests - Change of temperature EN 60876-1 - EN 61300 (Series) - EN 61300-2-1 - EN 61300-2-4 - EN 61300-2-9 - EN 61300-2-14 - EN 61300-2-17 - EN 61300-2-18 - EN 61300-2-19 - - - IEC 61300 (Series) IEC 61300-2-1 - IEC 61300-2-4 - IEC 61300-2-9 - IEC 61300-2-14 - IEC 61300-2-17 - IEC 61300-2-18 - IEC 61300-2-19 - IEC 61300-2-22 - BS EN 61753-071-2:2014 EN 61753-071-2:2014 IEC 61300-2-42 - IEC 61300-2-44 - IEC 61300-3-2 - IEC (mod) 61300-3-7- IEC 61300-3-20 - IEC 61300-3-21 - IEC 61300-3-50 - IEC 61753-1 2007 -4Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 2-42: Tests - Static side load for strain relief 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 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-2: Examinations and measurements Polarization dependent loss in a singlemode fibre optic device 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 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-20: Examinations and measurements Directivity of fibre optic branching devices Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-21: Examinations and measurements Switching time Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-50: Examinations and measurements Crosstalk for optical spatial switches Fibre optic interconnecting devices and passive components performance standard Part 1: General and guidance for performance standards EN 61300-2-42 - EN 61300-2-44 - EN 61300-3-2 - EN 61300-3-7 - EN 61300-3-20 - EN 61300-3-21 - EN 61300-3-50 - EN 61753-1 2007 –2– BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 CONTENTS Scope Normative references Terms and definitions Test conditions Test report Reference components Performance requirements 7.1 Dimensions 7.2 Test details and requirements Annex A (normative) Sample size 13 Bibliography 14 Figure – Configuration of × spatial switch Figure – Configuration of × spatial switch, non-crossover type Figure – Configuration of × spatial switch, crossover type Table – Single-mode spectral bands Table – Test details and requirements Table A.1 – Number of samples for each test 13 BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 –5– FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS – PERFORMANCE STANDARD – Part 071-2: Non-connectorized single-mode fibre optic × and × spatial switches for category C – Controlled environments Scope This part of IEC 61753 contains the minimum initial test and measurement requirements and severities which non-connectorized single-mode fibre optic × and × spatial switches need to 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 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 IEC 60876-1, Fibre optic interconnecting devices and passive components – Fibre optic spatial switches – Part 1: Generic specification IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic test and measurement procedures 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 –High optical power 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 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 –6– 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 2-42: 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: Examination and measurements – Polarization dependent loss in a single-mode fibre optic device 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 61300-3-21, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-21: Examinations and measurements – Switching time and bounce time IEC 61300-3-50, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-50: Examinations and measurements – Crosstalk for optical spatial switches IEC 61753-1:2007, Fibre optic interconnecting devices and passive components performance standard – Part 1: General and guidance for performance standards IEC/TR 62343-6-5, Dynamic modules – Part 6-5: Investigation of operating mechanical shock and vibration tests for dynamic modules ITU-T G-series Recommendations: Transmission systems and media,digital systems and networks – Supplement 39, Optical system design and engineering considerations Terms and definitions For the purposes of this document, the following terms and definitions, as well as those given in IEC 60876-1, apply 3.1 × spatial switch single-mode fibre-pigtailed × spatial switch as shown in Figure Note to entry: There is one input port and two output ports Outputs Input State State IEC Key 1, 2, and show a port number Figure – Configuration of × spatial switch 1577/14 BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 –7– 3.2 × spatial switch single-mode fibre-pigtailed × spatial switch as shown in Figures and Note to entry: There are two input ports and two output ports Inputs Outputs State State State 2 State IEC 1578/14 Key 1, 2, and show a port number Figure – Configuration of × spatial switch, non-crossover type Inputs Outputs State State IEC 1579/14 Key 1, 2, and show a port number Figure – Configuration of × spatial switch, crossover type 3.3 operational vibration vibration test whose relevant parameters should be monitored during the test 3.4 operational shock shock test whose relevant parameters should be monitored during the test Test conditions Unless otherwise specified, all test methods are in accordance with the IEC 61300 series × and × spatial switches used for each test are intended to be previously unstressed new samples but may also be selected from previously used samples if desired All measurements shall be carried out under standard atmospheric conditions, unless otherwise stated If the device is provided with an active temperature control, this shall be set at the setpoint specified by the manufacturer The requirements apply to every combination of input and output port Table is intended to provide guidance on the wavelength ranges of the various spectral bands It is not intended to serve as a specification Values of operating wavelength used in performance verification shall be specified between the customer and supplier or shall be as defined in the manufacturer’s specification –8– BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 Table – Single-mode spectral bands a a Band Descriptor Range nm O-band Original 260 to 360 E-band Extended 360 to 460 S-band Short wavelength 460 to 530 C-band Conventional 530 to 565 L-band Long wavelength 565 to 625 U-band Ultralong wavelength 625 to 675 ITU-T Supplement 39 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 Reference components The test for these components does not require the use of reference components 7.1 Performance requirements Dimensions Dimensions shall comply with those given in appropriate manufacturers’ drawings 7.2 Test details and requirements The requirements are given only for pigtailed × and × spatial switches A minimum length of fibre or cable of 1,5 m per port shall be included in all climatic and environmental test chambers The test details and requirements are shown in Table Table – Test details and requirements (1 of 5) No Tests Insertion loss Requirements ≤ 1,0 dB IEC 61300-3-7 Details Launch fibre length: ≥ 2,0 m Light source type: Unpolarized light Test results should be obtained under measurement uncertainty of ± 0,1 dB Crosstalk IEC 61300-3-50 ≤ –50 dB Launch fibre length: ≥ 2,0 m Light source type: Unpolarized light Test results should be obtained under measurement uncertainty of ± dB BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 –9– Table (2 of 5) No Tests Return loss Requirements ≥ 50 dB Grade U IEC 61300-3-7 Details Launch fibre length: ≥ 2,0 m Light source type: Unpolarized light Test results should be obtained under measurement uncertainty of ± dB Directivity ≤ –60 dB Launch fibre length: ≥ 2,0 m Light source type: Unpolarized light IEC 61300-3-20 Test results should be obtained under measurement uncertainty of ± dB Switching time ≤ 10 ms IEC 61300-3-21 Polarization dependent loss (PDL) ≤ 0,1 dB Launch fibre length: ≥ 2,0 m Switching from isolated state to conducting state Elapsed time when the output power of a specified output port maintains between 90 % and 110 % of its steady-state value of the output power from the time the actuation energy is applied Switching from conducting state to isolated state Elapsed time when the output power of a specified output port maintains between % and 10 % of its steady-state value of the output power from the time the actuation energy is removed Launch fibre length: ≥ 2,0 m The allowable PDL combination applies to all combination of input and output ports IEC 61300-3-2 Test results should be obtained under measurement uncertainty of ±0,05 dB High optical power IEC 61300-2-14 Before and after the test, the limits of insertion loss, isolation and return loss of test no 1, and shall be met During the test, the insertion loss change is monitored During and after the test, the insertion loss change shall be within ± 0,3 dB of the initial value During the test, the crosstalk change is monitored The sum of the initial value and the change of the crosstalk shall be within the value defined at test no During the test, the return loss change is monitored The sum of the initial value and the change of the return loss shall be within the value defined at test no Optical power 300 mW Wavelength 550 nm Duration of the optical power exposure 30 Temperature: 60 °C ± 2° C + − % RH Relative humidity: 93 Note Different wavelength is acceptable when there is a negotiation between customer and supplier – 10 – BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 Table (3 of 5) No Tests Cold IEC 61300-2-17 Requirements Details Temperature: –10° C ± 2° C Duration of exposure: 96 h Temperature: + 60° C ± 2° C Duration of exposure: 96 h Temperature: + 40 ± °C Relative humidity: 93 Duration of exposure: 96 h Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met High temperature: + 60 ± °C Low temperature: –10 ± °C Number of cycles: Cycles During and after the test, the insertion loss change shall be within ± 0,3 dB of the initial value Duration at extreme temperature: 60 Rate of change: °C/min Frequency range: Hz – 55 Hz Number of axes: orthogonal axes Number of sweeps: 15 /axis Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met The insertion loss change after the test shall be within ± 0,3 dB of the initial value High temperature endurance IEC 61300-2-18 Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met The insertion loss change after the test shall be within ± 0,3 dB of the initial value 10 Damp heat (steady state) IEC 61300-2-19 Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met The insertion loss change after the test shall be within ± 0,3 dB of the initial value 11 Change of temperature IEC 61300-2-22 + − % RH During the test, the crosstalk change is monitored The sum of the initial value and the change of the crosstalk shall be within the value defined at test no.2 12 Vibration IEC 61300-2-1 Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met Sweep rate: The insertion loss change after the test shall be within ± Amplitude: 0,3 dB of the initial value octave/min 0,75 mm BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 – 11 – Table (4 of 5) No 13 Tests Optical fibre cable flexing IEC 61300-2-44 Requirements Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met Details Tensile force: N for reinforced cable Number of cycles: 30 cycles ± 90° Magnitude and rate of application: (10 ± 1) N at N/s for reinforced cables The insertion loss change after the test shall be within ± 0,3 dB of the initial value 14 Fibre/cable retention IEC 61300-2-4 Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met The insertion loss change after the test shall be within ± 0,3 dB of the initial value (5,0 ± 0,5) N at 0,5 N/s for secondary coated fibres (2,0 ± 0,2) N at 0,5 N/s for primary coated fibres Duration of the test 120 s duration at 10 N 60 s duration at N or N 15 Static side load IEC 61300-2-42 Point of application of tensile load: 0,3 m from the exit point of the fibre / cable from the specimen Method of mounting: The sample shall be rigidly mounted such that the load is only applied to the fibre/cable retention mechanism Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met Magnitude and duration of the tensile load: N for h for reinforced cable Before and after the test, the limits of insertion loss, crosstalk and return loss of test no.1, and shall be met Acceleration: Direction of application: The insertion loss change after the test shall be within ± 0,3 dB of the initial value 16 Shock IEC 61300-2-9 Operational vibration IEC 61300-2-1 During the test the insertion loss shall be within ± 0,3 dB of initial value under ambient environmental conditions Two mutually perpendicular directions Components: 000 m/s Modules: 0,125 kg < module mass ≤ 0,225 kg: 000 m/s The insertion loss change after the test shall be within ± 0,3 dB of the initial value 17 0,2 N for for secondary coated fibres 0,225 kg < module mass ≤ kg: 500 m/s Duration: ms, half sine pulse Number of axis: axes in directions Number of shocks: shocks per axis, 12 shock in total Frequency range: 50 – 500 Hz Condition: G for three orthogonal axes Duration: sweeps/direction Sampling rate: KHz Note: The test condition is based on IEC/TR 62343-6-5 – 12 – BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 Table (5 of 5) No 18 Tests Requirements Operational shock During the test the insertion loss shall be within ± 0,3 dB IEC 61300-2-9 of original value under ambient environmental conditions Details Condition: 40 G, ms for three orthogonal axes Duration: times/direction Sampling rate: KHz Note The test condition is based on IEC/TR 62343-6-5 BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 – 13 – Annex A (normative) Sample size The number of samples to be evaluated for each test is defined in the sample size column in Table A.1 Table A.1 – Number of samples for each test No Test Sample size Insertion loss 12 Crosstalk 12 Return loss 12 Directivity 12 Switching time 12 Polarization dependent loss (PDL) 12 Optical power handling Cold High temperature endurance 10 Damp heat (steady state) 11 Change of temperature 12 Vibration (sinusoidal) 13 Optical fibre cable flexing 14 Fibre/cable retention 15 Static side load 16 Shock 17 Operational vibration 18 Operational shock – 14 – BS EN 61753-071-2:2014 IEC 61753-071-2:2014 © IEC 2014 Bibliography IEC 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-3: Examinations and measurements – Active monitoring of changes in attenuation and return loss IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-4: Examinations and measurements – Attenuation 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 62343-2, Dynamic modules – Part 2: Reliability qualification _ This page deliberately left blank This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Revisions We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions Our British Standards and other publications are updated by amendment or revision The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through our open consultation process Organizations of all sizes and across all sectors choose standards to help them achieve their goals Information on standards We can provide you with the knowledge that your organization needs to succeed Find out more about British Standards by visiting our website at bsigroup.com/standards or contacting our Customer Services team or Knowledge Centre Buying standards You can buy and download PDF versions of BSI publications, including British and adopted European and international standards, through our website at bsigroup.com/shop, where hard copies can also be purchased If you need international and foreign standards from other Standards Development Organizations, hard copies can be ordered from our Customer Services team Subscriptions Our range of subscription services are designed to make using standards easier for you For further information on our subscription products go to bsigroup.com/subscriptions With British Standards Online (BSOL) you’ll have instant access to over 55,000 British and adopted European and international standards from your desktop It’s available 24/7 and is refreshed daily so you’ll always be up to date You can keep in touch with standards developments and receive substantial discounts on the purchase price of standards, both in single copy and subscription format, by becoming a BSI Subscribing Member PLUS is an updating service exclusive to BSI Subscribing Members You will automatically receive the latest hard copy of your standards when they’re revised or replaced To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit bsigroup.com/shop With a Multi-User Network Licence (MUNL) you are able to host standards publications on your intranet Licences can cover as few or as many users as you wish With updates supplied as soon as they’re available, you can be sure your documentation is current For further information, email bsmusales@bsigroup.com BSI Group Headquarters 389 Chiswick High Road London W4 4AL UK We continually improve the quality of our products and services to benefit your business If you find an inaccuracy or ambiguity within a British Standard or other BSI publication please inform the Knowledge Centre Copyright All the data, software and documentation set out in all British Standards and other BSI publications are the property of and copyrighted by BSI, or some person or entity that owns copyright in the information used (such as the international standardization bodies) and has formally licensed such information to BSI for commercial publication and use 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 Details and advice can be obtained from the Copyright & Licensing Department Useful Contacts: Customer Services Tel: +44 845 086 9001 Email (orders): orders@bsigroup.com Email (enquiries): cservices@bsigroup.com Subscriptions Tel: +44 845 086 9001 Email: subscriptions@bsigroup.com Knowledge Centre Tel: +44 20 8996 7004 Email: knowledgecentre@bsigroup.com Copyright & Licensing Tel: +44 20 8996 7070 Email: copyright@bsigroup.com