Twinax cables for digital communications - Part 1: Generic specification

IEC 62783-1:2019(E) specifies definitions and requirements of twinax cables used in digital communication systems. These cables are intended to be used in indoor applications. This generic specification details the requirements and transmission characteristics for single twinax elements as well as multiple twinax elements within the same sheath, i.e. “twinax cable”.
This generic specification is supplemented with family specifications that give additional requirements based on the specific application, e.g. the maximum specified frequency of the cables.

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IEC 62783-1 ®
Edition 1.0 2019-01
Twinax cables for digital communications –
Part 1: Generic specification
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IEC 62783-1 ®
Edition 1.0 2019-01
Twinax cables for digital communications –

Part 1: Generic specification
ICS 33.120.20 ISBN 978-2-8322-6249-8

– 2 – IEC 62783-1:2019 © IEC 2019
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Requirements for cables construction . 9
4.1 General remarks . 9
4.2 Cable construction . 9
4.2.1 General . 9
4.2.2 Conductor . 9
4.2.3 Insulation . 10
4.2.4 Colour code . 10
4.2.5 Drain wire . 10
4.2.6 Screening of cable assembly element . 10
4.2.7 Cable make-up . 10
4.2.8 Screening of the cable core . 10
4.2.9 Sheath . 10
4.2.10 Colour of sheath . 11
4.2.11 Identification . 11
4.2.12 Finished cable . 11
5 Requirements and test methods . 11
5.1 General . 11
5.2 Electrical tests . 12
5.2.1 Conductor resistance . 12
5.2.2 Resistance unbalance. 12
5.2.3 Dielectric strength . 12
5.2.4 Insulation resistance . 12
5.2.5 Mutual capacitance . 12
5.2.6 Surface transfer impedance . 12
5.3 Transmission requirements and tests . 12
5.3.1 General . 12
5.3.2 Characteristic impedance . 13
5.3.3 Return loss . 13
5.3.4 Attenuation . 13
5.3.5 Propagation delay, inter-element delay skew, and intra-element delay
skew . 14
5.3.6 Near-end crosstalk (NEXT) . 14
5.3.7 Attenuation to crosstalk ratio far-end (ACR-F) . 15
5.3.8 Transverse conversion loss (TCL) . 15
5.3.9 Equal level transverse conversion transfer loss (ELTCTL) . 15
5.3.10 Screening attenuation . 15
5.3.11 Coupling attenuation . 15
5.4 Mechanical and dimensional requirements and test methods . 15
5.4.1 General . 15
5.4.2 Measurement of dimensions . 15
5.4.3 Elongation at break of the conductor. 16
5.4.4 Tensile strength of the insulation . 16

5.4.5 Elongation at break of the sheath . 16
5.4.6 Tensile strength of the sheath . 16
5.4.7 Crush test of the cable . 16
5.4.8 Impact test of the cable . 16
5.4.9 Repeated bending of the cable . 16
5.4.10 Tensile performance of the cable . 16
5.5 Environmental tests . 16
5.5.1 Shrinkage of the insulation . 16
5.5.2 Wrapping test of the insulation after thermal ageing . 16
5.5.3 Bending test of the insulation at low temperature . 16
5.5.4 Tensile strength and elongation of the sheath after ageing . 16
5.5.5 Sheath pressure test at high temperature . 16
5.5.6 Cold bend test of the cable . 17
5.5.7 Heat shock test . 17
5.5.8 Flame propagation characteristics of a single cable . 17
5.5.9 Flame propagation characteristics of bunched cables . 17
5.5.10 Smoke generation . 17
5.5.11 Combined flame and smoke test for cables in environmental air
handling spaces . 17
Bibliography . 18

Table 1 – Nominal attenuation values, dB/10 m . 13

– 4 – IEC 62783-1:2019 © IEC 2019

Part 1: Generic specification
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