1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20876-9 SANS 60793-2-20:2008 Edition 2 IEC 60793-2-20:2007 Edition 2SOUTH AFRICAN NATIONAL STANDARD Optical fibres Part 2-20: Product spec
4、ifications Sectional specification for category A2 multimode fibres This national standard is the identical implementation of IEC 60793-2-20:2007 and is adopted with the permission of the International Electrotechnical Commission. WARNING Can only be used in conjunction with SANS 60793-2. Published
5、by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 60
6、793-2-20:2008 Edition 2 IEC 60793-2-20:2007 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA SC 74A, Communication technology Fibre optics, in accordance with procedures of Standards South Africa, in compliance w
7、ith annex 3 of the WTO/TBT agreement. This SANS document was published in February 2008. This SANS document supersedes SANS 60793-2-20:2002 (edition 1). This standard may only be used and printed by approved subscription and freemailing clients of the SABS. IEC 60793-2-20 Edition 2.0 2007-10 INTERNA
8、TIONAL STANDARD NORME INTERNATIONALE Optical fibres Part 2-20: Product specifications Sectional specification for category A2 multimode fibres Fibres optiques Partie 2-20: Spcifications de produits Spcification intermdiaire pour les fibres multimodales de catgorie A2 INTERNATIONAL ELECTROTECHNICAL C
9、OMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE N ICS 33.180.10 PRICE CODE CODE PRIX ISBN 2-8318-9333-X SANS 60793-2-20:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 2 60793-2-20 IEC:2007 CONTENTS FOREWORD. 0H3 1 Scope. 1H5 2 Normat
10、ive references . 2H5 3 Specifications. 3H6 3.1 General . 4H6 3.2 Dimensional requirements . 5H6 3.3 Mechanical requirements. 6H7 3.4 Transmission requirements . 7H7 3.5 Environmental requirements 8H8 Annex A (normative) Family specifications for A2a multimode fibres 9H9 Annex B (normative) Family sp
11、ecifications for A2b multimode fibres 10H11 Annex C (normative) Family specifications for A2c multimode fibres 11H13 Bibliography 12H15 Table 1 Relevant dimensional attributes and measurement methods 13H6 Table 2 Requirements common to category A2 fibres. 14H7 Table 3 Additional attributes required
12、in the family specifications. 15H7 Table 4 Relevant mechanical attributes and test methods 16H7 Table 5 Requirements common to category A2 fibres. 17H7 Table 6 Relevant transmission attributes and measurement methods. 18H8 Table 7 Requirements common to fibres of category A2. 19H8 Table 8 Relevant e
13、nvironmental attributes and test methods 20H8 Table A.1 Dimensional requirements specific to A2a fibres . 21H9 Table A.2 Mechanical requirements specific to A2a fibres 22H9 Table A.3 Transmission requirements specific to A2a fibres. 23H9 Table A.4.1 Environmental exposure tests . 24H10 Table A.4.2 A
14、ttributes measured 25H10 Table B.1 Dimensional requirements specific to A2b fibres 26H11 Table B.2 Mechanical requirements specific to A2b fibres 27H11 Table B.3 Transmission requirements specific to A2b fibres. 28H11 Table B.4.1 Environmental exposure tests . 29H12 Table B.4.2 Attributes measured 3
15、0H12 Table C.1 Dimensional requirements specific to A2c fibres 31H13 Table C.2 Mechanical requirements specific to A2c fibres 32H13 Table C.3 Transmission requirements specific to A2c fibres. 33H13 Table C.4.1 Environmental exposure tests . 34H14 Table C.4.2 Attributes measured 35H14 SANS 60793-2-20
16、:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.60793-2-20 IEC:2007 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 2-20: Product specifications Sectional specification for category A2 multimode fibres FOREWORD 1) The Int
17、ernational 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 ele
18、ctronic 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 committ
19、ees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
20、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 h
21、as 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 accur
22、ate, 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 regiona
23、l publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity
24、with an IEC Publication. 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 pers
25、onal 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 ref
26、erences 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 fo
27、r 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 second edition cancels and replaces the first edition, published in 2002. It constitutes a technical revision
28、. The main changes from the previous edition are: the addition of tensile strength requirement; the removal of water immersion requirement; the addition of environmental requirements. SANS 60793-2-20:2008This standard may only be used and printed by approved subscription and freemailing clients of t
29、he SABS. 4 60793-2-20 IEC:2007 The text of this standard is based on the following documents: CDV Result of voting 86A/1129/CDV 86A/1151/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 d
30、rafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of 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 maintenance result
31、 date indicated on the IEC web site 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. SANS 60793-2-20:2008This standard may only be used and printed by approved subsc
32、ription and freemailing clients of the SABS.60793-2-20 IEC:2007 5 OPTICAL FIBRES Part 2-20: Product specifications Sectional specification for category A2 multimode fibres 1 Scope This part of IEC 60793-2 is applicable to optical fibres type A2a, A2b, and A2c. These fibres are used or can be incorpo
33、rated in information transmission equipment and optical fibre cables (typically up to 2 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 giv
34、en in Clause 3; particular requirements applicable to individual fibre types or specific applications, which are defined in the normative family specification annexes. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated referenc
35、es, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60793-1-20, Optical fibres Part 1-20: Measurement methods and test procedures Fibre geometry IEC 60793-1-21, Optical fibres Part 1-21: Measurement methods
36、 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
37、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 proced
38、ures Numerical aperture IEC 60793-1-46, Optical fibres Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance SANS 60793-2-20:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 6 60793-2-20 IEC:2007
39、IEC 60793-1-50, Optical fibres Part 1-50: Measurement methods and test procedures Damp heat (steady state) IEC 60793-1-51, Optical fibres Part 1-51: Measurement methods and test procedures Dry heat IEC 60793-1-52, Optical fibres Part 1-52: Measurement methods and test procedures Change of temperatur
40、e IEC 60793-2:2003, Optical fibres Part 2: Product specifications General IEC 62048, Optical fibres Reliability Power law theory 3 Specifications 3.1 General The fibre shall consist of a glass core and a glass cladding in accordance with 4.2 of IEC 60793-2. The term “glass” refers to material usuall
41、y consisting of non-metallic oxides. The composition of some fibres may be all glass, or glass and glass/hard polymeric composites. 3.2 Dimensional requirements Relevant dimensional attributes and measurement methods are indicated in Table 1. Requirements common to all fibres in category A2 appear i
42、n Table 2. Table 3 lists additional attributes that shall be specified by each family specification. Table 1 Relevant dimensional attributes and measurement methods Attribute Measurement method Cladding diameter IEC 60793-1-20 Core diameter IEC 60793-1-20 Core non-circularity IEC 60793-1-20 Core-cla
43、dding concentricity error IEC 60793-1-20 Coating diameter IEC 60793-1-21 Fibre length IEC 60793-1-22 SANS 60793-2-20:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.60793-2-20 IEC:2007 7 Table 2 Requirements common to category A2 fibres Att
44、ribute Unit Limits Core non-circularity % 4 Coating diameter m aFibre length km ba 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.Table 3 Additional attributes required in the family speci
45、fications Attributes Cladding diameter Core diameter 3.3 Mechanical requirements Relevant mechanical attributes and test methods are indicated in Table 4. Requirements common to all fibres in category A2 are given in Table 5. Table 4 Relevant mechanical attributes and test methods Attribute Test met
46、hod Tensile strength IEC 60793-1-31 (0,5 m sample length) Strain rate 3 % to 5 % / minute Proof test IEC 60793-1-30 Table 5 Requirements common to category A2 fibres Attribute Unit Limit Proof stress level GPa 0,345 aa For the relation between different units, see 4.4 of IEC 62048. 3.4 Transmission
47、requirements Relevant transmission attributes and measurement methods are given in Table 6. Requirements common to all fibres in category A2 are given in Table 7. SANS 60793-2-20:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 8 60793-2-20
48、 IEC:2007 Table 6 Relevant transmission attributes and measurement methods Attribute Test Attenuation coefficient aIEC 60793-1-40 Optical continuity IEC 60794-1-40 or IEC 60793-1-46 Modal bandwidth aIEC 60793-1-41 Numerical aperture aIEC 60793-1-43 Theoretical numerical aperture IEC 60793-1-20 Chang
49、e of optical transmission IEC 60793-1-46 a When measuring attenuation and modal bandwidth and numerical aperture, the appropriate launching conditions should be applied - as specified in Annex A of the specified part of IEC 60793-1. The testing length shall be agreed between customer and supplier Table 7 Requirements common to fibres of category A2 Attribute Unit Limit Atte
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