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IEC 61156-6：2007 Multicore and symmetrical pair／quad cables for digital communications－Part 6.pdf
Multicore and symmetrical pair/quad
cables for digital communications –
Part 6:
Symmetrical pair/quad cables with
transmission characteristics up to 1 000 MHz –
Work area wiring – Sectional specification
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2007 IEC, Geneva, Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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–2–
61156-6 © IEC:2007(E)
CONTENTS
FOREWORD...........................................................................................................................4
1
2
3
4
Scope ...............................................................................................................................6
Normative references .......................................................................................................6
Terms and definitions .......................................................................................................7
Installation considerations ................................................................................................7
4.1 General ...................................................................................................................7
4.2 Climatic conditions ..................................................................................................7
Materials and cable construction ......................................................................................7
5.1
5.2
General remarks......................................................................................................7
Cable construction ..................................................................................................7
5.2.1 Conductor....................................................................................................7
5.2.2 Insulation.....................................................................................................7
5.2.3 Cable element .............................................................................................7
5.2.4 Cable make-up ............................................................................................8
5.2.5 Screening of the cable core .........................................................................8
5.2.6 Sheath.........................................................................................................8
5.2.7 Identification ................................................................................................8
5.2.8 Finished cable .............................................................................................8
Characteristics and requirements .....................................................................................8
6.1
6.2
General remarks......................................................................................................8
Electrical characteristics and tests ..........................................................................9
6.2.1 Conductor resistance...................................................................................9
6.2.2 Resistance unbalance .................................................................................9
6.2.3 Dielectric strength .......................................................................................9
6.2.4 Insulation resistance....................................................................................9
6.2.5 Mutual capacitance......................................................................................9
6.2.6 Capacitance unbalance ...............................................................................9
6.2.7 Transfer impedance .....................................................................................9
6.2.8 Coupling attenuation.................................................................................. 10
6.2.9 Ampacity ................................................................................................... 10
Transmission characteristics ................................................................................. 10
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)......................................................................... 12
6.3.6 Far-end crosstalk (FEXT) ........................................................................... 12
6.3.7 Alien (exogenous) near-end crosstalk ........................................................ 13
6.3.8 Alien (exogenous) far-end crosstalk........................................................... 13
6.3.9 Alien (exogenous) crosstalk of bundled cables .......................................... 14
6.3.10 Mean characteristic impedance ................................................................. 14
6.3.11 Return loss (RL) ........................................................................................ 14
Mechanical and dimensional characteristics and requirements .............................. 14
6.4.1 Dimensional requirements ......................................................................... 14
6.4.2 Elongation at break of the conductors ........................................................ 14
6.4.3 Tensile strength of the insulation ............................................................... 14
5
6
6.3
6.4
61156-6 © IEC:2007(E)
–3–
7
6.4.4 Elongation at break of the insulation .......................................................... 15
6.4.5 Adhesion of the insulation to the conductor ............................................... 15
6.4.6 Elongation at break of the sheath .............................................................. 15
6.4.7 Tensile strength of the sheath ................................................................... 15
6.4.8 Crush test of the cable .............................................................................. 15
6.4.9 Impact test of the cable ............................................................................. 15
6.4.10 Bending under tension ............................................................................... 15
6.4.11 Repeated bending of the cable .................................................................. 15
6.4.12 Tensile performance of the cable ............................................................... 15
6.4.13 Shock-test requirements of the cable ......................................................... 15
6.4.14 Bump-test requirements of the cable ......................................................... 15
6.4.15 Vibration-test requirements of a cable ....................................................... 15
6.5 Environmental characteristics ................................................................................ 15
6.5.1 Shrinkage of insulation .............................................................................. 15
6.5.2 Wrapping test of insulation after thermal ageing ........................................ 16
6.5.3 Bending test of insulation at low temperature ............................................ 16
6.5.4 Elongation at break of the sheath after ageing ........................................... 16
6.5.5 Tensile strength of the sheath after ageing ................................................ 16
6.5.6 Sheath pressure test at high temperature .................................................. 16
6.5.7 Cold bend test of the cable ........................................................................ 16
6.5.8 Heat shock test.......................................................................................... 16
6.5.9 Damp heat steady state ............................................................................. 16
6.5.10 Solar radiation ........................................................................................... 16
6.5.11 Solvents and contaminating fluids.............................................................. 16
6.5.12 Salt mist and sulphur dioxide ..................................................................... 16
6.5.13 Water immersion ....................................................................................... 16
6.5.14 Hygroscopicity ........................................................................................... 16
6.5.15 Wicking ..................................................................................................... 16
6.5.16 Flame propagation characteristics of a single cable ................................... 17
6.5.17 Flame propagation characteristics of bunched cables ................................ 17
6.5.18 Halogen gas evolution ............................................................................... 17
6.5.19 Smoke generation ..................................................................................... 17
6.5.20 Toxic gas emission .................................................................................... 17
6.5.21 Integrated fire test ..................................................................................... 17
Introduction to the blank detail specification ................................................................... 17
Bibliography.......................................................................................................................... 18
Table 1 – Cable categories .....................................................................................................6
Table 2 – Transfer impedance .............................................................................................. 10
Table 3 – Coupling attenuation ............................................................................................. 10
Table 4 – Attenuation, constant values ................................................................................. 11
Table 5 – Near-end unbalance attenuation............................................................................ 12
Table 6 – Worst-pair PS NEXT values .................................................................................... 12
Table 7 – Worst-pair PS EL FEXT .......................................................................................... 13
Table 8 – PS ANEXT .............................................................................................................. 13
Table 9 – PS AELFEXT .......................................................................................................... 14
Table 10 – Return loss .......................................................................................................... 14
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