Twinax cables for digital communications - Part 1-1: Time domain test methods for twinax cables for digital communications - General requirements

IEC 62783-1-1:2022 specifies time domain test methods, parameters and requirements for fixtures for twinax cables (known also as twin-axial cables or twin-coaxial cables) used in digital communication systems. The methods and fixtures facilitate measurements of differential and common mode transmission parameters as well as single-ended mode parameters. This document is applicable to twinax cables and also to symmetric cables with pitch.

General Information

Status
Published
Publication Date
16-Jun-2022
Current Stage
PPUB - Publication issued
Completion Date
17-Jun-2022
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IEC 62783-1-1:2022 - Twinax cables for digital communications - Part 1-1: Time domain test methods for twinax cables for digital communications - General requirements
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IEC 62783-1-1
Edition 1.0 2022-06
INTERNATIONAL
STANDARD
colour
inside
Twinax cables for digital communications –
Part 1-1: Time domain test methods for twinax cables for digital
communications – General requirements
IEC 62783-1-1:2022-06(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62783-1-1
Edition 1.0 2022-06
INTERNATIONAL
STANDARD
colour
inside
Twinax cables for digital communications –
Part 1-1: Time domain test methods for twinax cables for digital
communications – General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.20 ISBN 978-2-8322-3853-0

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62783-1-1:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions and abbreviated terms ........................................................................ 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated term .................................................................................................... 8

4 Test equipment ................................................................................................................ 8

4.1 Measurement equipment ......................................................................................... 8

4.2 Coaxial cables (test leads) ...................................................................................... 8

4.3 Test fixtures ............................................................................................................ 9

4.4 Termination resistors .............................................................................................. 9

4.5 Through calibration kit (Thru kit) ............................................................................. 9

5 Test conditions ................................................................................................................ 9

6 Measurement methods .................................................................................................. 10

6.1 Calibration ............................................................................................................ 10

6.2 De-skew ................................................................................................................ 10

6.3 Establish the reference plane for the TDR measurement ....................................... 10

6.4 Establish the reference plane for the TDT measurement ....................................... 11

6.5 Measurement ........................................................................................................ 11

7 Test report ..................................................................................................................... 11

Bibliography .......................................................................................................................... 12

Figure 1 – Test schematic diagram for open location of the test fixture ................................. 10

Figure 2 – Test schematic diagram for TDT measurement .................................................... 11

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IEC 62783-1-1:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TWINAX CABLES FOR DIGITAL COMMUNICATIONS –
Part 1-1: Time domain test methods for twinax cables
for digital communications – General requirements
FOREWORD

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

IEC 62783-1-1 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. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
46C/1191/CDV 46C/1218/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.
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– 4 – IEC 62783-1-1:2022 © IEC 2022

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

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 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.

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contents. Users should therefore print this document using a colour printer.
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IEC 62783-1-1:2022 © IEC 2022 – 5 –
INTRODUCTION

This document specifies the general requirements of time domain test methods for twinax

cables used in information technology systems. The high data rates of these systems need both

frequency domain test methods and time domain test methods to ensure signal integrity.

Time domain here refers to time domain analysis or display(s), as defined by an X-Y graph

where the X-axis is either time or electrical length of device under test (DUT), and the Y-axis is

magnitude (voltage, impedance or reflection coefficient). Time domain display provides a direct

view of the DUT's characteristics. In addition, time domain method gives information concerning

the reflection and transmission of the DUT and it can show the effect of each discontinuity as a

function of time or distance.
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– 6 – IEC 62783-1-1:2022 © IEC 2022
TWINAX CABLES FOR DIGITAL COMMUNICATIONS –
Part 1-1: Time domain test methods for twinax cables
for digital communications – General requirements
1 Scope

This part of IEC 62783-1 specifies time domain test methods, parameters and requirements for

fixtures for twinax cables (known also as twin-axial cables or tw
...

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