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.

General Information

Status
Published
Publication Date
23-Jan-2019
Current Stage
PPUB - Publication issued
Completion Date
24-Jan-2019
Ref Project

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IEC 62783-1
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
Twinax cables for digital communications –
Part 1: Generic specification
IEC 62783-1:2019-01(en)
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IEC 62783-1
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
Twinax cables for digital communications –
Part 1: Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-6249-8

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62783-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

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

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IEC 62783-1:2019 © IEC 2019 – 3 –

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

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– 4 – IEC 62783-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TWINAX CABLES FOR DIGITAL COMMUNICATIONS –
Part 1: Generic specification
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 co-operation on all questions concerning standardization in the electrical and electronic fields. To

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62783-1 has been prepared by subcommittee 46C: Wires and

symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, RF connectors,

RF and microwave passive components and accessories.
The text of this International Standard is based on the following documents:
FDIS Report on voting
46C/1107/FDIS 46C/1113/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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IEC 62783-1:2019 © IEC 2019 – 5 –

A list of all parts in the IEC 62783 series, published under the general title Twinax cables for

digital communications, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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– 6 – IEC 62783-1:2019 © IEC 2019
INTRODUCTION

This International Standard specifies the generic characteristics of twinax cables, which use

multiple twinax cable elements for transmission of digital signals.

These cables are intended for use in high-performance information technology systems and

data interface interconnection systems. Twinax cables are generally used in short-reach data

communication links, which reach about 1 m to 10 m. Information technology interconnection

standards that use twinax cables include Ethernet, Fibre channel, SAS, SATA, and others.

IEC 62783 (all parts) includes separate family specifications, which are provided for each

information technology interconnection standard’s specific twinax cable requirements.

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IEC 62783-1:2019 © IEC 2019 – 7 –
TWINAX CABLES FOR DIGITAL COMMUNICATIONS –
Part 1: Generic specification
1 Scope

This part of IEC 62783 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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of 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 60028, International standard of resistance for copper
IEC 60068 (all parts), Environmental testing

IEC 60189-1, Low-frequency cables and wires with PVC insulation and PVC sheath – Part 1:

General test and measuring methods
IEC 60304, Standard colours for insulation for low-frequency cables and wires

IEC 60332-1-2, Tests on electric and optical fibre cables under fire conditions – Part 1-2: Test

for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW pre-

mixed flame

IEC 60332-2-2, Tests on electric and optical fibre cables under fire conditions – Part 2-2: Test

for vertical flame propagation for a single small insulated wire or cable – Procedure for

diffusion flame

IEC 60332-3-10, Tests on electric and optical fibre cables under fire conditions – Part 3-10:

Test for vertical flame spread of vertically-mounted bunched wires or cables – Apparatus

IEC TR 60344, Calculation of d.c. resistance of plain and coated copper conductors of low-

frequency cables and wires – Application guide

IEC 60708, Low-frequency cables with polyolefin insulation and moisture barrier polyolefin

sheath

IEC 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test

procedures – General guidance
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– 8 – IEC 62783-1:2019 © IEC 2019

IEC 60811-201, Electric and optical fibre cables – Test methods for non-metallic materials –

Part 201: General tests – Measurement of insulation thickness

IEC 60811-203, Electric and optical fibre cables – Test methods for non-metallic materials –

Part 203: General tests – Measurement of overall dimensions

IEC 60811-401, Electric and optical fibre cables – Test methods for non-metallic materials –

Part 401: Miscellaneous tests – Thermal ageing methods – Ageing in an air oven

IEC 60811-406, Electric and optical fibre cables – Test methods for non-metallic materials –

Part 406: Miscellaneous tests – Resistance to stress cracking of polyethylene and

polypropylene compounds

IEC 60811-501, Electric and optical fibre cables – Test methods for non-metallic materials –

Part 501: Mechanical tests – Tests for determining the mechanical properties of insulating and

sheathing compounds

IEC 60811-502, Electric and optical fibre cables – Test methods for non-metallic materials –

Part 502: Mechanical tests – Shrinkag
...

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