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 0-626-18263-8 SANS 60794-3-21:2006Edition 1 IEC 60794-3-21:2005Edition 1SOUTH AFRICAN NATIONAL STANDARD Optical fibre cables Part 3-21: Outdoor cabl
4、es Detailed specification for optical self-supporting aerial telecommunication cables for use in premises cabling This national standard is the identical implementation of IEC 60794-3-21:2005 and is adopted with the permission of the International Electrotechnical Commission. Published by Standards
5、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 SANS 60794-3-21:2006 Edition 1 IEC 60794-3-21:2005 Edition 1 Table of changes Change No. Date Scope National foreword This S
6、outh African standard was approved by National Committee StanSA SC 74A, Communication technology Fibre optics, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. NORME INTERNATIONALECEIIECINTERNATIONAL STANDARD 60794-3-21Premire ditionFirst
7、edition2005-06Cbles fibres optiques Partie 3-21: Cbles extrieurs Spcification particulire pour les cbles optiques de tlcommunication ariens autoporteurs utiliss dans le cblage de locaux Optical fibre cables Part 3-21: Outdoor cables Detailed specification for optical self- supporting aerial telecomm
8、unication cables for use in premises cabling Pour prix, voir catalogue en vigueur For price, see current catalogue IEC 2005 Droits de reproduction rservs Copyright - all rights reserved Aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun p
9、rocd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de lditeur. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publis
10、her. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch CODE PRIX PRICE CODE H Commission Electrotechnique InternationaleInternational Electrotechnical Commi
11、ssion 60794-3-21 IEC:2005 3 CONTENTS FOREWORD.5 1 Scope.9 2 Normative references .9 3 General requirements.9 4 Particular requirements 11 4.1 Environmental requirements11 4.1.1 Temperature cycling 11 4.2 Transmission requirements .11 4.2.1 Attenuation of cabled fibre.11 4.2.2 Fibre bandwidth require
12、ments13 Bibliography15 Table 1 Multimode maximum cable attenuation coefficient (dB/km)11 Table 2 Single-mode maximum cable attenuation coefficient (dB/km) 13 Table 3 Minimum multimode fibre bandwidth (MHzkm)13 60794-3-21 IEC:2005 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRE CABLES Par
13、t 3-21: Outdoor cables Detailed specification for optical self-supporting aerial telecommunication cables for use in premises cabling FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (I
14、EC 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
15、, 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 non-
16、governmental 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
17、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 ac
18、cepted 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 internat
19、ional 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
20、latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity 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 it
21、s 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
22、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
23、 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 60794-3-21 has been prepared by subcommittee SC86A: Fibres and cables, of IE
24、C technical committee 86: Fibre optics. This first edition of IEC 60794-3-21 cancels and replaces IEC/PAS 60794-3-21, published in March 2004. This standard is to be used in conjunction with IEC 60794-1-1, IEC 60794-1-2, IEC 60794-3, Edition 2, and IEC 60794-3-20. The text of this standard is based
25、on the following documents: FDIS Report on voting 86A/999/FDIS 86A/1007/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. 60794-3-21 IEC:2005 7 This publication has been drafted in accordance with the ISO/IEC Direc
26、tives, Part 2. IEC 60794 consists of the following parts, under the general title Optical fibre cables: Part 1-1: Generic specification General Part 1-2: Generic specification Basic optical cable test procedures Part 2: Indoor cables Sectional specification Part 2-10: Indoor cables Family specificat
27、ion for simplex and duplex cables Part 2-11: Indoor cables Detailed specification for simplex and duplex cables for use in premises cabling Part 2-20: Indoor cables Family specification for multi-fibre optical distribution cables Part 2-21: Indoor cables Detailed specification for multi-fibre optica
28、l distribution cables for use in premises cabling Part 2-30: Indoor cables Family specification for optical fibre ribbon cables Part 2-31: Indoor cables Detailed specification for optical fibre ribbon cables for use in premises cabling Part 3 : Sectional specification Outdoor cables Part 3-10: Outdo
29、or cables Family specification for duct and directly buried optical telecommunication cables Part 3-12: Outdoor cables Detailed specification for duct and directly buried optical telecommunication cables for use in premises cabling Part 3-20: Outdoor cables Family specification for optical self-supp
30、orting aerial telecommunication cables Part 3-21: Outdoor cables Detailed specification for optical self-supporting aerial telecommunication cables for use in premises cabling Part 3-30: Outdoor cables Family specification for optical telecommunication cables for lake and river crossings Part 4 : Se
31、ctional specification Aerial optical cables along electrical power lines The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication
32、. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. 60794-3-21 IEC:2005 9 OPTICAL FIBRE CABLES Part 3-21: Outdoor cables Detailed specification for optical self-supporting aerial telecommunication cables for use in premises cabling 1 Scope This
33、part of IEC 60794 is a detailed specification. It presents the detailed requirements specific to optical self-supporting telecommunication cables for use in premises cabling, to ensure compatibility with ISO 1180111. The requirements of the family specification IEC 60794-3-20 are applicable to cable
34、s covered by this standard. 2 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
35、. They complete the normative references already listed in the generic specification (IEC 60794-1-1, Clause 2, and IEC 60794-1-2, Clause 2) in the sectional specification (IEC 60794-3, Clause 2), or in the family specification (IEC 60794-3-20, Clause 2). IEC 60793-2-10:2002, Optical fibres Part 2-10
36、: Product specification Sectional specification for category A1 multimode fibre IEC 60793-2-50, 2004, Optical fibres Part 2-50: Product specification Sectional specification for class B single-mode fibre IEC 60794-1-1:2001, Optical fibre cables Part 1-1: Generic specification General IEC 60794-1-2:2
37、003, Optical fibre cables Part 1-1: Generic specification Basic optical cable test procedures IEC 60794-3:2002, Optical fibre cables Part 3: Sectional specification Outdoor cables IEC 60794-3-20:2002, Optical fibre cables Part 3-20: Outdoor optical fibre cables Family Specification for optical self-
38、supporting aerial telecommunication cables 3 General requirements The cables shall comply with the family specification, IEC 60794-3-20, and meet the requirements which are defined in it. 1Figures between brackets refer to the Bibliography. 60794-3-21 IEC:2005 11 The optical fibres contained in the
39、cables which are covered by this standard shall comply with one of the following standards, and meet the normative requirements defined in them as applicable: IEC 60793-2-50, Annex A Single-mode fibre, B1.1 type; IEC 60793-2-50, Annex C Single-mode fibre, B1.3 type; IEC 60793-2-10, Annex A Multimode
40、 fibre, A1a type, 50 m core diameter; IEC 60793-2-10, Annex B Multimode fibre, A1b type, 62,5 m core diameter. To ensure compatibility with ISO 118011, optical performance level requirements are presented in terms of the performance classification codes as follows: OS1 Single-mode fibre, B1.1 or B1.
41、3 type; OM1 Multimode fibre, A1a or A1b type; OM2 Multimode fibre, A1a or A1b type; OM3 Multimode fibre, A1a.2 type. NOTE These codes are informative from the perspective of the requirements defined in this detailed specification. 4 Particular requirements These requirements either define a specific
42、 option relative to the requirements of IEC 60794-3-20 or define additional requirements. 4.1 Environmental requirements 4.1.1 Temperature cycling The cable shall meet the requirements of IEC 60794-3-20, subclause 4.6.2.8, with the following values: TA1: 20 C TA2: 45 C TB1: +60 C TB2: +70 C 4.2 Tran
43、smission requirements 4.2.1 Attenuation of cabled fibre Depending on the fibre type, the attenuation coefficient of the cabled fibre shall be less than the maximum values in Table 1 for the multimode fibres and less than the maximum values in Table 2 for single-mode fibres for the wavelengths listed
44、 in the column headings. The fibre type shall be agreed between customer and supplier. Table 1 Multimode maximum cable attenuation coefficient (dB/km) Fibre type Attenuation coefficient at 850 nm Attenuation coefficient at 1 300 nm IEC 60793-2-10, A1a.1 type 3,5 1,5 IEC 60793-2-10, A1a.2 type 3,5 1,
45、5 IEC 60793-2-10, A1b type 3,5 1,5 60794-3-21 IEC:2005 13 Table 2 Single-mode maximum cable attenuation coefficient (dB/km) Fibre type Attenuation coefficient at 1 310 nm Attenuation coefficient at 1 550 nm IEC 60793-2-50, B1.1 or B1.3 type 1,0 1,0 4.2.2 Fibre bandwidth requirements There are no ban
46、dwidth requirements on single-mode fibre. For cables containing multimode fibres, the uncabled fibre shall be specified at one of the performance levels defined in Table 3 in terms of minimum bandwidth (MHzkm), wavelength, and type of measurement. The fibre type and performance level shall be agreed
47、 between customer and supplier. Table 3 Minimum multimode fibre bandwidth (MHzkm) Fibre type Nominal core diameter m Overfilled bandwidth at 850 nm Overfilled bandwidth at 1 300 nm Effective modal bandwidth at 850 nm* Performance code from ISO 11801 1 IEC 60793-2-10, A1a.1 type 50 200 500 Non-applic
48、able OM1 IEC 60793-2-10, A1a.1 type 50 500 500 Non-applicable OM2 IEC 60793-2-10, A1a.2 type 50 1 500 500 2 000 OM3 IEC 60793-2-10, A1b type 62,5 200 500 Non-applicable OM1 IEC 60793-2-10, A1b type 62,5 500 500 Non-applicable OM2 60794-3-21 IEC:2005 15 Bibliography 1 ISO 11801:2002, Information technology Generic cabling for customers premises _ Standards South AfricaThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .
