1、 IEC 61156-8Edition 1.0 2009-05INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 8: Symmetrical pair/quad cables with transmission characteristics up to 1 200 MHz Work area wiring Sectional specification IEC61156-8:2009(E) THIS PUBLICATION IS COPYRIGHT
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9、 +41 22 919 03 00 IEC 61156-8Edition 1.0 2009-05INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 8: Symmetrical pair/quad cables with transmission characteristics up to 1 200 MHz Work area wiring Sectional specification INTERNATIONAL ELECTROTECHNICAL
10、COMMISSION QICS 33.120.20 PRICE CODEISBN 2-8318-1040-9 Registered trademark of the International Electrotechnical Commission 2 61156-8 IEC:2009(E) CONTENTS FOREWORD.4 1 Scope.6 2 Normative references6 3 Terms and definitions .6 4 Installation considerations.7 4.1 Installation conditions 7 4.2 Climat
11、ic conditions.7 5 Materials and cable construction .7 5.1 General remarks7 5.2 Cable construction.7 5.2.1 Conductor7 5.2.2 Insulation.7 5.2.3 Cable element .7 5.2.4 Cable make-up 8 5.2.5 Screening of cable core .8 5.2.6 Sheath.8 5.2.7 Identification 8 5.2.8 Finished cable .8 6 Characteristics and re
12、quirements8 6.1 General remarks8 6.2 Electrical characteristics 9 6.2.1 Conductor resistance .9 6.2.2 Resistance unbalance9 6.2.3 Dielectric strength9 6.2.4 Insulation resistance 9 6.2.5 Mutual capacitance 9 6.2.6 Capacitance unbalance9 6.2.7 Transfer impedance.9 6.2.8 Coupling attenuation 10 6.2.9
13、Current-carrying capacity .10 6.2.10 Shield resistance .10 6.3 Transmission characteristics10 6.3.1 Velocity of propagation (phase velocity) .10 6.3.2 Phase delay and differential delay (delay skew)10 6.3.3 Attenuation 11 6.3.4 Unbalance attenuation .11 6.3.5 Near-end crosstalk (NEXT).11 6.3.6 Far-e
14、nd crosstalk (FEXT) .12 6.3.7 Alien (exogenous) near-end crosstalk 12 6.3.8 Alien (exogenous) far-end crosstalk .12 6.3.9 Alien (exogenous) crosstalk of bundled cables .12 6.3.10 Impedance.12 6.3.11 Return loss (RL).12 6.4 Mechanical and dimensional characteristics and requirements .13 6.4.1 Dimensi
15、onal requirements13 6.4.2 Elongation at break of the conductors 13 61156-8 IEC:2009(E) 3 6.4.3 Tensile strength of the insulation13 6.4.4 Elongation at break of the insulation.13 6.4.5 Adhesion of the insulation to the conductor 13 6.4.6 Elongation at break of the sheath.13 6.4.7 Tensile strength of
16、 the sheath 13 6.4.8 Crush test of the cable.13 6.4.9 Impact test of the cable13 6.4.10 Bending under tension .13 6.4.11 Repeated bending of the cable.13 6.4.12 Tensile performance of the cable .13 6.4.13 Shock test of the cable.14 6.4.14 Bump test of the cable .14 6.4.15 Vibration test of a cable .
17、14 6.5 Environmental characteristics 14 6.5.1 Shrinkage of insulation.14 6.5.2 Wrapping test of insulation after thermal ageing.14 6.5.3 Bending test of insulation at low temperature .14 6.5.4 Elongation at break of the sheath after ageing14 6.5.5 Tensile strength of the sheath after ageing.14 6.5.6
18、 Sheath pressure test at high temperature.14 6.5.7 Cold bend test of the cable 14 6.5.8 Heat shock test14 6.5.9 Damp heat steady state .14 6.5.10 Solar radiation .15 6.5.11 Solvents and contaminating fluids 15 6.5.12 Salt mist and sulphur dioxide .15 6.5.13 Water immersion .15 6.5.14 Hygroscopicity
19、15 6.5.15 Wicking .15 6.5.16 Flame propagation characteristics of a single cable15 6.5.17 Flame propagation characteristics of bunched cables.15 6.5.18 Halogen gas evolution15 6.5.19 Smoke generation15 6.5.20 Toxic gas emission 15 6.5.21 Integrated fire test .15 7 Introduction to the blank detail s
20、pecification 16 Bibliography17 Table 1 Transfer impedance.10 Table 2 Coupling attenuation 10 Table 3 Attenuation, constant values 11 Table 4 Return loss (RL).12 4 61156-8 IEC:2009(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES FOR DIGITAL COMMUNICATIONS Par
21、t 8: Symmetrical pair/quad cables with transmission characteristics up to 1 200 MHz Work area wiring Sectional specification FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC Nation
22、al 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, Publicl
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30、ut 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
31、 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 61156-8 has been prepared by subcommittee 46C: Wires and symmetric cables, of IEC tec
32、hnical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories. The text of this standard is based on the following documents: FDIS Report on voting 46C/887/FDIS 46C/894/RVD Full information on the voting for the approval of this standard can b
33、e found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 61156-8 IEC:2009(E) 5 A list of all parts of the IEC 61156 series, under the general title: Multicore and symmetrical pair/quad cables for digital commun
34、ications, can be found on the IEC website. 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. At this date, the publicatio
35、n will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 61156-8 IEC:2009(E) MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES FOR DIGITAL COMMUNICATIONS Part 8: Symmetrical pair/quad cables with transmission chara
36、cteristics up to 1 200 MHz Work area wiring Sectional specification 1 Scope This sectional specification relates to IEC 61156-1 and IEC 61156-7. The cables described herein are specified up to 1 200 MHz and are specifically designed to build patch, equipment, and work area cables as defined in ISO/I
37、EC 11801 and ISO/IEC 15018. It covers a cable having four individually screened (STP) pairs. The cable may be provided with a common screen over the cable core. The transmission characteristics are specified for a frequency range 4 MHz to 1 200 MHz and at 20 C. These cables can be used for various c
38、ommunication channels which use as many as four pairs simultaneously. In this sense, this sectional specification provides the cable characteristics required by system developers to evaluate new systems. The cables covered by this sectional specification are intended to operate with voltages and cur
39、rents normally encountered in communication systems. These cables are not intended to be used in conjunction with low impedance sources, for example the electric power supplies of public utility mains. 2 Normative references The following referenced documents are indispensable for the application of
40、 this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60304, Standard colours for insulation for low-frequency cables and wires IEC 61156-1:2007, Multicore and symmetrical pa
41、ir/quad cables for digital communications Part 1: Generic specification IEC 61156-7, Multicore and symmetrical pair/quad cables for digital communications Part 7: Symmetrical pair cables with transmission characteristics up to 1 200 MHz Sectional specification for digital and analog communication ca
42、bles 3 Terms and definitions For the purposes of this document, the terms and definitions defined in IEC 61156-1 apply. 61156-8 IEC:2009(E) 7 4 Installation considerations 4.1 Installation conditions Installation considerations are defined in Clause 4 of IEC 61156-1. 4.2 Climatic conditions Under st
43、atic conditions, the cables shall operate in the temperature range from 20 C to +60 C. The temperature dependence of the cables is specified, and should be taken into account for the design of an actual cabling system. 5 Materials and cable construction 5.1 General remarks The choice of materials an
44、d cable construction shall be suitable for the intended application and installation of the cable. Particular care shall be taken to meet any special requirements for the fire performance (such as burning properties, smoke generation, evolution of halogen gas, etc.). 5.2 Cable construction The cable
45、 construction shall be in accordance with the details and dimensions given in the relevant detail specification. 5.2.1 Conductor The conductor shall be solid or stranded annealed copper conductor, in accordance with IEC 61156-1 and shall have a nominal diameter between 0,4 mm to 0,65 mm. The strande
46、d conductor should have preferably seven strands. Higher conductor diameters may be used if compatible with the connecting hardware. 5.2.2 Insulation The conductor shall be insulated with a suitable thermoplastic material. Examples of suitable materials are polyolefin; fluoropolymer; low-smoke zero-
47、halogen thermoplastic material. The insulation may be solid or cellular with or without a solid dielectric skin. The insulation shall be continuous and shall have a thickness such that the completed cable meets the specified requirements. The insulation colour code is not specified but shall be indi
48、cated in the relevant detail specification. The colours shall be readily identifiable and shall correspond reasonably with the standard colours shown in IEC 60304. NOTE It is acceptable to mark or stripe the “a“ wire with the colour of the “b“ wire to facilitate pair identification. 5.2.3 Cable elem
49、ent The cable element shall be screened pair or quad adequately twisted. The screen of the cable element shall be in accordance with 5.2.3.1 of IEC 61156-1. 8 61156-8 IEC:2009(E) 5.2.4 Cable make-up A spacer may be used to separate the cable elements. The cable elements, including spacers, shall be assembled to form the cable core. The core of the cable may be wrapped with a protective layer of non-hygroscopic and not-wicking material. 5.2.5 Screening of cable
