1、 IEC/PAS 61156-1-4Edition 1.0 2010-06PUBLICLY AVAILABLE SPECIFICATIONPRE-STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 1-4:Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Conductor heating of bundled data grade cables for limited p
2、ower transmission based on IEEE 802.3 IEC/PAS 61156-1-4:2010(E)colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.THIS PUBLICATION IS COPYRI
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10、rial licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.IEC/PAS 61156-1-4Edition 1.0 2010-06PUBLICLY AVAILABLE SPECIFICATIONPRE-STANDARD Multicore and symmetrical pair/quad
11、cables for digital communications Part 1-4:Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Conductor heating of bundled data grade cables for limited power transmission based on IEEE 802.3 INTERNATIONAL ELECTROTECHNICAL COMMISSION XICS 33.120.20 PRICE CODEISBN 978-2-88
12、912-032-1 Registered trademark of the International Electrotechnical Commission colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-28-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 PAS 611
13、56-1-4 IEC:2010(E)CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.8 3 Terms,definitions,symbols,units and abbreviated terms.8 3.1 Terms and definitions.8 3.2 Symbols,units and abbreviated terms.9 4 The testing of bundled cables.11 4.1 General comments.11 4.2 The bundling of cables.11 4.3 The su
14、spension of the cable bundle.14 4.4 Assessment of the concatenated loop resistance of all pairs.16 5 The temperature as a function of the current load in conductors of bundled cables in hexagonal densest packing structure.17 5.1 The test description.17 5.2 The temperature measurement.18 5.3 The heat
15、 generation and the resulting increase of the resistance.20 5.4 The specific resistivity referencing the IACS.24 6 Assessing already deployed cable systems.26 6.1 Background.26 6.2 The installed base.26 6.3 A simplified assessment of the installed base.27 7 The higher performing data grade cables.27
16、 7.1 Conductor and cable diameters.27 8 The heat dissipation on heated and bundled cables.28 8.1 Radiation.28 8.2 Conduction.28 8.3 Convection.28 9 The heat dissipation in a heated conductor,pair or cable which has to be taken into account.29 9.1 The heat dissipation of individual components.29 9.2 The heat dissipation of real cables.35 10 Thermodynamic considerations for a combined experimental and mathematical solution of the heating problem.37 10.1 Objective.37 10.2 The cable bundle consid
