Bsi bs en 60793 2 20 2016

BS EN 60793-2-20:2016 BSI Standards Publication Optical fibres Part 2-20: Product specifications — Sectional specification for category A2 multimode fibres BRITISH STANDARD BS EN 60793-2-20:2016 National foreword This British Standard is the UK implementation of EN 60793-2-20:2016 It is identical to IEC 60793-2-20:2015 It supersedes BS EN 60793-2-20:2009 which is withdrawn The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables A list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 2016 Published by BSI Standards Limited 2016 ISBN 978 580 85612 ICS 33.180.10 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 March 2016 Amendments/corrigenda issued since publication Date Text affected BS EN 60793-2-20:2016 EUROPEAN STANDARD EN 60793-2-20 NORME EUROPÉENNE EUROPÄISCHE NORM February 2016 ICS 33.180.10 Supersedes EN 60793-2-20:2009 English Version Optical fibres - Part 2-20: Product specifications - Sectional specification for category A2 multimode fibres (IEC 60793-2-20:2015) Fibres optiques - Partie 2-20: Spécifications de produits Spécification intermédiaire pour les fibres multimodales de catégorie A2 (IEC 60793-2-20:2015) Lichtwellenleiter - Teil 2-20: Produktspezifikationen Rahmenspezifikation für Mehrmodenfasern der Kategorie A2 (IEC 60793-2-20:2015) This European Standard was approved by CENELEC on 2015-12-24 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 © 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 60793-2-20:2016 E BS EN 60793-2-20:2016 EN 60793-2-20:2016 European foreword The text of document 86A/1602/CDV, future edition of IEC 60793-2-20, prepared by SC 86A "Fibres and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60793-2-20:2016 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) 2016-09-24 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-12-24 This document supersedes EN 60793-2-20:2009 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 60793-2-20:2015 was approved by CENELEC as a European Standard without any modification BS EN 60793-2-20:2016 EN 60793-2-20:2016 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 60793-1-20 2001 Optical fibres Part 1-20: Measurement methods and test procedures - Fibre geometry EN 60793-1-20 2002 IEC 60793-1-21 - Optical fibres Part 1-21: Measurement methods and test procedures - Coating geometry EN 60793-1-21 - IEC 60793-1-22 - Optical fibres Part 1-22: Measurement methods and test procedures - Length measurement EN 60793-1-22 - IEC 60793-1-30 - Optical fibres Part 1-30: Measurement methods and test procedures - Fibre proof test EN 60793-1-30 - IEC 60793-1-31 - Optical fibres Part 1-31: Measurement methods and test procedures - Tensile strength EN 60793-1-31 - IEC 60793-1-40 - Optical fibres Part 1-40: Measurement methods and test procedures - Attenuation EN 60793-1-40 - IEC 60793-1-41 - Optical fibres Part 1-41: Measurement methods and test procedures - Bandwidth EN 60793-1-41 - IEC 60793-1-43 - Optical fibres Part 1-43: Measurement methods and test procedures - Numerical aperture measurement EN 60793-1-43 - IEC 60793-1-46 - Optical fibres Part 1-46: Measurement methods and test procedures - Monitoring of changes in optical transmittance EN 60793-1-46 - BS EN 60793-2-20:2016 EN 60793-2-20:2016 Publication Year Title EN/HD Year IEC 60793-1-50 - Optical fibres Part 1-50: Measurement methods and test procedures - Damp heat (steady state) tests EN 60793-1-50 - IEC 60793-1-51 - Optical fibres Part 1-51: Measurement methods and test procedures - Dry heat (steady state) tests EN 60793-1-51 - IEC 60793-1-52 - Optical fibres Part 1-52: Measurement methods and test procedures - Change of temperature tests EN 60793-1-52 - IEC 60793-2 - Optical fibres Part 2: Product specifications - General EN 60793-2 - –2– BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 CONTENTS FOREWORD Scope Normative references Specifications 3.1 3.2 3.3 3.4 3.5 Annex A General Dimensional requirements Mechanical requirements Transmission requirements Environmental requirements (normative) Specifications for sub-category A2a multimode fibres 10 A.1 A.2 A.3 A.4 A.5 Annex B General 10 Dimensional requirements 10 Mechanical requirements 10 Transmission requirements 10 Environmental requirements 11 (normative) Specifications for sub-category A2b multimode fibres 12 B.1 B.2 B.3 B.4 B.5 Annex C General 12 Dimensional requirements 12 Mechanical requirements 12 Transmission requirements 12 Environmental requirements 13 (normative) Specifications for sub-category A2c multimode fibres 14 General 14 C.1 C.2 Dimensional requirements 14 C.3 Mechanical requirements 14 C.4 Transmission requirements 14 C.5 Environmental requirements 15 Bibliography 16 Table – Relevant dimensional attributes and measurement methods Table – Dimensional requirements common to all category A2 fibres Table – Additional dimensional attributes required for each sub-category Table – Relevant mechanical attributes and test methods Table – Mechanical requirements common to all category A2 fibres Table – Relevant transmission attributes and measurement methods Table –Requirements common to all category A2 fibres Table – Relevant environmental attributes and test methods Table A.1 –Dimensional requirements specific to A2a fibres 10 Table A.2 – Mechanical requirements specific to A2a fibres 10 Table A.3 –Transmission requirements specific to A2a fibres 11 Table A.4 – Environmental exposure tests 11 Table A.5 – Attributes measured 11 BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 –3– Table B.1 – Dimensional requirements specific to A2b fibres 12 Table B.2 – Mechanical requirements specific to A2b fibres 12 Table B.3 – Transmission requirements specific to A2b fibres 12 Table B.4 – Environmental exposure tests 13 Table B.5 – Attributes measured 13 Table C.1 – Dimensional requirements specific to A2c fibres 14 Table C.2 – Mechanical requirements specific to A2c fibres 14 Table C.3 – Transmission requirements specific to A2c fibres 14 Table C.4 – Environmental exposure tests 15 Table C.5 – Attributes measured 15 –4– BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION OPTICAL FIBRES – Part 2-20: Product specifications – Sectional specification for category A2 multimode fibres FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees) The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”) Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter 5) IEC itself does not provide any attestation of conformity Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity IEC is not responsible for any services carried out by independent certification bodies 6) All users should ensure that they have the latest edition of this publication 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications 8) Attention is drawn to the Normative references cited in this publication Use of the referenced publications is indispensable for the correct application of this publication 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights IEC shall not be held responsible for identifying any or all such patent rights International Standard IEC 60793-2-20 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics This third edition cancels and replaces the second edition, published in 2007 This edition constitutes a technical revision This edition includes the following significant technical changes with respect to the previous edition: a) Na th has been replaced by NA ff ; b) specified test specimen length and measurement details for core diameter and NA ff measurements BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 –5– The text of this standard is based on the following documents: CDV Report on voting 86A/1602/CDV 86A/1628A/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table This publication has been drafted in accordance with the ISO/IEC Directives, Part A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can be found on the IEC website The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific publication At this date, the publication will be • reconfirmed, • withdrawn, • replaced by a revised edition, or • amended A bilingual version of this publication may be issued at a later date IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents Users should therefore print this document using a colour printer –6– BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 OPTICAL FIBRES – Part 2-20: Product specifications – Sectional specification for category A2 multimode fibres Scope This part of IEC 60793 is applicable to sub-categories A2a, A2b, and A2c These fibres are used or can be incorporated in information transmission equipment and optical fibre cables (typically up to km) Three types of requirements apply to these fibres: • general requirements as defined in IEC 60793-2; • specific requirements common to the category A2 multimodal fibres covered in this standard and which are given in Clause 3; • particular requirements applicable to individual sub-categories or specific applications, which are defined in the normative family specification annexes 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 60793-1-20:2001, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre geometry IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures – Coating geometry IEC 60793-1-22, Optical fibres – Part 1-22: Measurement methods and test procedures – Length measurement IEC 60793-1-30, Optical fibres – Part 1-30: Measurement methods and test procedures – Fibre proof test IEC 60793-1-31, Optical fibres – Part 1-31: Measurement methods and test procedures – Tensile strength IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures – Attenuation IEC 60793-1-41, Optical fibres – Part 1-41: Measurement methods and test procedures – Bandwidth IEC 60793-1-43, Optical fibres – Part 1-43: Measurement methods and test procedures – Numerical aperture measurement IEC 60793-1-46, Optical fibres – Part 1-46: Measurement methods and test procedures – Monitoring of changes in optical transmittance BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 –7– IEC 60793-1-50, Optical fibres – Part 1-50: Measurement methods and test procedures – Damp heat (steady state) tests IEC 60793-1-51, Optical fibres – Part 1-51: Measurement methods and test procedures – Dry heat (steady state) tests IEC 60793-1-52, Optical fibres – Part 1-52: Measurement methods and test procedures – Change of temperature tests IEC 60793-2, Optical fibres –Part 2: Product specifications – General Specifications 3.1 General The fibre shall consist of a glass core and a glass cladding in accordance with the definition given in IEC 60793-2 3.2 Dimensional requirements Relevant dimensional attributes and measurement methods are indicated in Table Dimensional requirements common to all sub-categories appear in Table Table lists additional dimensional attributes that shall be specified by each sub-category Table – Relevant dimensional attributes and measurement methods Attribute Measurement method Cladding diameter IEC 60793-1-20 diameter a IEC 60793-1-20 Core non-circularity IEC 60793-1-20 Core-cladding concentricity error IEC 60793-1-20 Coating diameter IEC 60793-1-21 Fibre length IEC 60793-1-22 Core a Core diameter is specified at 850 nm ± 10 nm with a test specimen length of 2,0 m ± 0,2 m and a threshold value k CORE of 0,5 (IEC 60793-1-20 Method B) Table – Dimensional requirements common to all category A2 fibres Attribute Unit Limit Core non-circularity % ≤4 Coating diameter µm Fibre length km a The diameter of the coating is dependent on the cable structure and applications b Length requirements vary and should be agreed between supplier and customer a b –8– BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 Table – Additional dimensional attributes required for each sub-category Attribute Cladding diameter Core diameter 3.3 Mechanical requirements Relevant mechanical attributes and test methods are indicated in Table Mechanical requirements common to all sub-categories are given in Table Table – Relevant mechanical attributes and test methods Attribute Test method Tensile strength IEC 60793-1-31 (0,5 m specimen length) Strain rate %/min to %/min Proof test IEC 60793-1-30 Table – Mechanical requirements common to all category A2 fibres Attribute Proof stress level a Unit Limit GPa ≥ 0,345 a For the relation between different units, see 7.4 of IEC TR 62048:2014 3.4 Transmission requirements Relevant transmission attributes and measurement methods are given in Table Requirements common to all sub-categories are given in Table Table – Relevant transmission attributes and measurement methods Attribute Attenuation coefficient Modal a bandwidth a Numerical aperture NA ff Test IEC 60793-1-40 IEC 60793-1-41 a,b Change of optical transmission IEC 60793-1-43 IEC 60793-1-46 a When measuring attenuation, modal bandwidth and numerical aperture, the appropriate launching conditions should be applied as specified in the corresponding measurement methods (IEC 60793-1-40, IEC 60793­1­41 and IEC 60793-1-43) b Numerical aperture (NA ff ) is specified at a test specimen length of 2,0 m ± 0,2 m with a threshold value, k NA of 0,5 measured at 850 nm BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 –9– Table –Requirements common to all category A2 fibres Attribute Attenuation coefficient at λ Y nm a Modal bandwidth at λ Y nm a Numerical aperture (NA ff ) a 3.5 Unit Limit dB/km ≤ 10 MHz ⋅ ≥ 10 km Unitless 0,23 ± 0,03 or 0,26 ± 0,03 The wavelength, λ Y , shall be agreed between supplier and customer Environmental requirements Relevant environmental attributes and test methods are given in Table Table – Relevant environmental attributes and test methods Attribute Test method Damp heat tests IEC 60793-1-50 Dry heat tests IEC 60793-1-51 Change of temperature tests IEC 60793-1-52 BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 – 10 – Annex A (normative) Specifications for sub-category A2a multimode fibres A.1 General The clauses and tables in Annex A contain the particular requirements applicable to A2a fibres Common requirements, repeated here for ease of reference from the sectional specification, are noted by an entry in the “Reference” column Relevant notes from the sectional specification are not repeated but indicated with a superscript “ SS ” A.2 Dimensional requirements Table A.1 contains dimensional requirements specific to A2a fibres Table A.1 –Dimensional requirements specific to A2a fibres Attribute Unit Limit Reference Cladding diameter µm 140 ±10 3.2 Core diameter µm 100 ±4 3.2 Table Core non-circularity % ≤4 3.2 Coating diameter µm See 3.2 3.2 Fibre length km See 3.2 3.2 A.3 Mechanical requirements Table A.2 contains mechanical requirements specific to A2a fibres Table A.2 – Mechanical requirements specific to A2a fibres Attribute Unit Limit Reference Proof stress level GPa ≥ 0,345 SS 3.3 A.4 Transmission requirements Table A.3 contains transmission requirements specific to A2a fibres BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 – 11 – Table A.3 –Transmission requirements specific to A2a fibres Attribute Unit Limit Reference Attenuation coefficient at λ Y nm SS dB/km ≤ 10 3.4 ≥ 10 3.4 Modal bandwidth at λ Y nm SS Numerical aperture (NA ff ) A.5 MHz ⋅ km Unitless 0,23 ±0,03 or 3.4 0,26 ±0,03 Table Environmental requirements Tables A.4 and A.5 contain environmental exposure tests and measurement methods specific to A2a fibres Test and measurements shall be documented in two forms: – relevant environmental attributes, test methods and test conditions are given in Table A.4; – measurements of a particular mechanical and transmission attribute that may change during exposure to the environmental test are listed in Table A.5 Table A.4 – Environmental exposure tests Environment Test method Test condition Damp heat IEC 60793-1-50 +70 °C, 85 % RH, 30 days Dry heat IEC 60793-1-51 +70 °C, 30 days Change of temperature IEC 60793-1-52 T a : –20 °C, T b :+70 °C Table A.5 – Attributes measured Attribute Change in optical transmission at attenuation coefficient at λ Y nm SS Tensile strength Unit Limit dB/km ≤2 GPa at 15 % and 50 % Weibull probability levels 2,20 at 15 % Reference 2,41 at 50 % These tests are normally conducted periodically as type-tests for a fibre design Unless otherwise indicated, the recovery period allowed between the completion of the environmental exposure and measuring the attributes shall be as stated in the particular environmental test method BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 – 12 – Annex B (normative) Specifications for sub-category A2b multimode fibres B.1 General The clauses and tables in Annex B contain the particular requirements applicable to A2b fibres Common requirements, repeated here for ease of reference from the sectional specification, are noted by an entry in the “Reference” column Relevant notes from the sectional specification are not repeated but indicated with a superscript “ SS ” B.2 Dimensional requirements Table B.1 contains dimensional requirements specific to A2b fibres Table B.1 – Dimensional requirements specific to A2b fibres Attribute Unit Limit Reference Cladding diameter µm 240 ±10 3.2 Core diameter µm 200 ±8 3.2 Table Core non-circularity % ≤4 3.2 Coating diameter µm See 3.2 3.2 Fibre length km See 3.2 3.2 B.3 Mechanical requirements Table B.2 contains mechanical requirements specific to A2b fibres Table B.2 – Mechanical requirements specific to A2b fibres Attribute Unit Limit Proof stress level GPa 0,345 SS B.4 ≥ Reference 3.3 Transmission requirements Table B.3 contains transmission requirements specific to A2b fibres Table B.3 – Transmission requirements specific to A2b fibres Attribute Unit Limit Reference Attenuation coefficient at λ Y nm SS dB/km ≤ 10 3.4 ≥ 10 3.4 0,23 ±0,03 or 0,26 ±0,03 3.4 Table Modal bandwidth at λ Y nm SS Numerical aperture (NA ff ) MHz ⋅ km Unitless BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 B.5 – 13 – Environmental requirements Tables B.4 and B.5 contain environmental exposure tests and measurement methods specific to A2b fibres Test and measurements shall be documented in two forms: – relevant environmental attributes, test methods and test conditions are given in Table B.4 – measurements of a particular mechanical and transmission attribute that may change during exposure to the environmental test are listed in Table B.5 Table B.4 – Environmental exposure tests Environment Test method Test condition Damp heat IEC 60793-1-50 +70 °C, 85 % RH, 30 days Dry heat IEC 60793-1-51 +70 °C, 30 days Change of temperature IEC 60793-1-52 T a : -20 °C, T b :+70 °C Table B.5 – Attributes measured Attribute Change in optical transmission at attenuation coefficient at λ Y nm SS Tensile strength Unit Limit dB/km ≤2 GPa at 15 % and 50 % Weibull probability levels 0,75 at 15 % 0,82 at 50 % Reference These tests are normally conducted periodically as type tests for a fibre design Unless otherwise indicated, the recovery period allowed between the completion of the environmental exposure and measuring the attributes shall be as stated in the particular environmental test method BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 – 14 – Annex C (normative) Specifications for sub-category A2c multimode fibres C.1 General The clauses and tables in Annex C contain the particular requirements applicable to A2c fibres Common requirements, repeated here for ease of reference from the sectional specification, are noted by an entry in the “Reference” column Relevant notes from the sectional specification are not repeated but indicated with a superscript “ SS ” C.2 Dimensional requirements Table C.1 contains dimensional requirements specific to A2c fibres Table C.1 – Dimensional requirements specific to A2c fibres Attribute Unit Limit Reference Cladding diameter µm 280 ±10 3.2 Core diameter µm 200 ±8 3.2 Table Core non-circularity % ≤4 3.2 Coating diameter µm See 3.2 3.2 Fibre length km See 3.2 3.2 C.3 Mechanical requirements Table C.2 contains mechanical requirements specific to A2c fibres Table C.2 – Mechanical requirements specific to A2c fibres Attribute Unit Limit Reference Proof stress level GPa ≥ 0,345 SS 3.3 C.4 Transmission requirements Table C.3 contains transmission requirements for A2c fibres Table C.3 – Transmission requirements specific to A2c fibres Attribute Unit Limit Reference Attenuation coefficient at λ Y nm SS dB/km ≤ 10 3.4 ≥ 10 3.4 0,23 ±0,03 or 0,26 ±0,03 3.4 Table Modal bandwidth at λ Y nm SS Numerical aperture (NA ff ) MHz ⋅ km Unitless BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 C.5 – 15 – Environmental requirements Tables C.4 and C.5 contain environmental exposure tests and measurement methods specific to A2c fibres Test and measurements shall be documented in two forms: – relevant environmental attributes, test methods and test conditions are given in Table C.4 – measurements of a particular mechanical and transmission attribute that may change during exposure to the environmental test are listed in Table C.5 Table C.4 – Environmental exposure tests Environment Test method Test condition Damp heat IEC 60793-1-50 +70 °C, 85 % RH, 30 days Dry heat IEC 60793-1-51 +70 °C, 30 days Change of temperature IEC 60793-1-52 T a : -20 °C, T b :+70 °C Table C.5 – Attributes measured Attribute Change in optical transmission at attenuation coefficient at λ Y nm SS Tensile strength Unit Limit dB/km ≤2 GPa at 15 % and 50 % Weibull probability levels 0,55 at 15 % 0,60 at 50 % Reference These tests are normally conducted periodically as type tests for a fibre design Unless otherwise indicated, the recovery period allowed between the completion of the environmental exposure and measuring the attributes shall be as stated in the particular environmental test method – 16 – BS EN 60793-2-20:2016 IEC 60793-2-20:2015 © IEC 2015 Bibliography IEC TR 62048:2014, Optical fibres – Reliability – Power law theory _ This page deliberately left blank This page deliberately left 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