1、BSI Standards Publication Guidance for the selection of drop cables PD IEC/TR 62901:2016National foreword This Published Document is the UK implementation of IEC/TR 62901:2016. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1
2、, 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 Institutio
3、n 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 85067 7 ICS 33.180.10 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 April 2016. Amendments
4、/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TR 62901:2016 IEC TR 62901 Edition 1.0 2016-03 TECHNICAL REPORT Guidance for the selection of drop cables INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.180.10 ISBN 978-2-8322-3235-4 Registered trademark of the Inter
5、national Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside PD IEC/TR 62901:2016 2 IEC TR 62901:2016 IEC 2016 CONTENTS FOREWORD . 5 1 Scope 7 2 Normative references. 7 3 Terms, definitions and abbreviations 7 3.1 Terms and
6、definitions 7 3.2 Abbreviations 8 4 Application spaces . 8 4.1 General . 8 4.2 Installation between poles . 9 4.2.1 General . 9 4.2.2 Self-supporting cables 9 4.2.3 Lashed and suspended cables . 11 4.3 Installation in ducts . 12 4.4 Installation in sewer, water and gas pipes 12 4.5 Direct-buried cab
7、les 12 4.6 Installation on facades 13 5 Installation options . 14 5.1 General . 14 5.2 Installation between poles . 14 5.2.1 General . 14 5.2.2 Self-supporting cables 14 5.2.3 Lashed cables 16 5.2.4 Suspended cables 16 5.3 Cables in ducts . 16 5.3.1 General . 16 5.3.2 Pulling . 16 5.3.3 Jetting . 16
8、 5.3.4 Blowing 17 5.3.5 Pushing . 17 5.4 Installation in sewer, water and gas pipes 17 5.4.1 General . 17 5.4.2 Specific deployment options . 17 5.5 Direct-buried cables 17 5.6 Installation on facades 18 5.6.1 General . 18 5.6.2 Specific installation options 18 6 Testing 18 6.1 General . 18 6.2 Stan
9、dard test procedures 18 6.3 Additional test methods . 19 6.3.1 General . 19 6.3.2 Abrasion resistance against wind induced vibration in contact with rough surface . 19 6.3.3 Tensioning performance test 19 7 Examples of commonly used drop cable designs 20 7.1 General . 20 PD IEC/TR 62901:2016IEC TR 6
10、2901:2016 IEC 2016 3 7.2 Designs to be used for the installation between poles 20 7.2.1 Self-supporting cables 20 7.2.2 Lashed and suspended cables . 25 7.3 Designs to be used for the installation in ducts 26 7.4 Designs to be used for the installation in sewer, water and gas pipes . 27 7.5 Designs
11、to be used for direct-buried cables . 27 7.6 Designs to be used for the installation at facades. 28 Annex A (informative) Installation of fibre optic drop cables along facades 31 A.1 Method 1: Tensioning the cable using clamps between anchors . 31 A.2 Method 2: Attaching the cable with using crimps
12、on the wall . 31 A.3 Method 3: Installing a duct (e.g. fixed by crimps) and pushing the cable through the duct 31 A.4 Method 4: Using of alternative routes through the restricted space of windows and doors 31 Annex B (informative) Estimation of the pushing length . 32 Annex C (informative) Additiona
13、l clamp types for optical drop cables 34 Bibliography . 36 Figure 1 Configuration of a typical FTTH network 8 Figure 2 Dead ends to be used for the installation of long length self-supporting cables 9 Figure 3 P-clamp . 10 Figure 4 MCC 10 Figure 5 Wedge clamp . 11 Figure 6 Motor-driven lash machine
14、11 Figure 7 Crimp used to fix a cable to the messenger wire . 12 Figure 8 Tape armored cable . 13 Figure 9 Puncture-free installation of drop cable . 14 Figure 10 Attack of drop cables by cicada . 15 Figure 11 Tensioning performance test set-up 20 Figure 12 Self-supporting dielectric aerial cable 21
15、 Figure 13 Stranded self-supporting dielectric aerial cable . 21 Figure 14 Self-supporting aerial cable with non concentrically- arranged strength members 22 Figure 15 Flat self-supporting aerial cable with strength members on both sides . 23 Figure 16 Rectangular design with one integrated messenge
16、r wire and strength members 24 Figure 17 Indoor / outdoor aerial drop cable with removable sheath 24 Figure 18 Lashed cable 25 Figure 19 Cables suitables for pushing . 26 Figure 20 Robust direct-buried cable with low diameter . 27 Figure 21 Facade cables 29 Figure C.1 Droplet type clamp 34 Figure C.
17、2 Fish type clamp. 34 Figure C.3 P-clamp 35 Figure C.4 Wedge type clamp 35 PD IEC/TR 62901:2016 4 IEC TR 62901:2016 IEC 2016 Table 1 Self-supporting dielectric aerial cables . 21 Table 2 Stranded self-supporting dielectric aerial cables . 22 Table 3 Self-supporting cable with non concentrically-arra
18、nged strength members 22 Table 4 Flat self-supporting aerial cable with strength members on both sides 23 Table 5 Rectangular design with one integrated messenger wire and strength member 24 Table 6 Indoor / outdoor aerial drop cable with removable sheath . 25 Table 7 Lashed cable . 25 Table 8 Desig
19、ns to be used for the installation in ducts . 27 Table 9 Robust direct-buried cable with low diameter 28 Table 10 Designs to be used for the installation at facades . 30 Table 11 Facade cable for fibre counts up to 4 fibres 30 PD IEC/TR 62901:2016IEC TR 62901:2016 IEC 2016 5 INTERNATIONAL ELECTROTEC
20、HNICAL COMMISSION _ GUIDANCE FOR THE SELECTION OF DROP CABLES 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 c
21、o-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
22、 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- governmental organizations liaising with the IEC also participate in th
23、is 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 internation
24、al 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 e
25、fforts 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 Public
26、ations 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. I
27、ndependent 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)
28、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 cost
29、s (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 applica
30、tion 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. The main task of IEC technical committees is to prepare Internati
31、onal Standards. However, a technical committee may propose the publication of a Technical Report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC TR 62901, which is a Technical Report, has been prep
32、ared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. The text of this technical report is based on the following documents: Enquiry draft Report on voting 86A/1676/DTR 86A/1707/RVC Full information on the voting for the approval of this technical report can be fo
33、und in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. PD IEC/TR 62901:2016 6 IEC TR 62901:2016 IEC 2016 The committee has decided that the contents of this publication will remain unchanged until the stability d
34、ate 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 Th
35、e 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. PD IEC/TR 62901:2016IEC TR 62901:2016 IEC 2016 7 GUIDANCE
36、FOR THE SELECTION OF DROP CABLES 1 Scope This Technical Report defines the term “drop cable“, describes the application spaces and the performance requirements as a consequence of the different applications. Cable design options which result from specific applications which are not yet described in
37、the existing product specifications will be explained. This technical report also gives some guidance on cable testing with focused attention on cable performance requirements which are not covered by existing standards yet. This technical report is not intended to be used as a product standard. 2 N
38、ormative 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 amendmen
39、ts) applies. None 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 drop cables cables closing the gap between distribution cables (starting at the Network Access Point or NAP) and the single users hom
40、e (Multi Dwelling Units or MDUs), or other premises Note 1 to entry: Drop cables are deployed in aerial, in duct, direct-buried, on facades as well as indoor/outdoor cables. Note 2 to entry: Drop cables end either outside the building or inside the building. Therefore, often so-called indoor/outdoor
41、 cables are needed to provide the appropriate fire performance. Note 3 to entry: The Network access point (NAP) or Access Point is connected to the users house by aerial drop cables or underground drop cables, as shown in Figure 1. PD IEC/TR 62901:2016 8 IEC TR 62901:2016 IEC 2016 Figure 1 Configura
42、tion of a typical FTTH network 3.2 Abbreviations ADSS All Dielectric Self-Supporting Cable ARP Aramid Reenforced Plastic EFL Excess Fibre Length FRNC Flame Retardant Non Corrosive FTTH Fiber To The Home GRP Glass Fibre Reinforced Plastic HDPE High Density PE LDPE Low Density PE LSZH Low Smoke Zero H
43、alogen MCC Metal Cable Clamp NOTE MCC are not made of metal anymore. MDPE Medium Density PE NAP Network Access Point PE Polyethylene PP Polypropylene FR Flame Retardant TB Tight Buffered Fibre or Tight Buffer 4 Application spaces 4.1 General Clause 4 describes most of the different ways commonly use
44、d to connect the end user to the distribution cable. IEC Access point Access point Closure Splitter Aerial cable Users buildings Apartment houses Underground cable Users houses Distribution Feeder PD IEC/TR 62901:2016IEC TR 62901:2016 IEC 2016 9 4.2 Installation between poles 4.2.1 General In some c
45、ountries, the installation of fibre optic aerial drop cable is the most preferred option because of the relatively low effort compared to other methods like installation in ducts, direct burying, etc. Especially when the distribution cable has been installed between poles, it is common practice to a
46、lso use an aerial installation for the last few meters from the NAP to the building. The connection to the NAP can either be done by splicing individual fibres to the NAP, or using field-installable connectors, or using preconnectorized cables when the NAP is designed to access the branched fibres v
47、ia already installed connectors. Normally, only lower fibre counts (e.g. 1 to 8 optical fibres) are required. The distances are short (typically between 20 m and 100 m), thus the span lengths between the poles are also short (15 m to 50 m). Depending on the preferred installation method, fibre optic
48、al cables can be installed as self- supporting cables, lashed cables or suspended cables. Even though the span length is short, ice and wind loads have to be taken into account especially when stringent sag requirements are to be fulfilled. Cables with a black sheath are typically used for outdoor i
49、nstallations. The black colour is the result of the addition of “carbon black“. A concentration of approximately 2,5 % ensures the long term stability against UV radiation. When other sheath colours are used (e.g. for a better appearance) UV stabilizers have to be added. The functionality of those stabilizers has to be demonstrated by appropriate test procedures. 4.2.2 Self-supporting cables A self-supporting cable contains all require
