Specification for the testing of balanced and coaxial information technology cabling - Part 2: Cords as specified in ISO/IEC 11801 and related standards

IEC 61935-2:2010 provides methods to ensure compatibility of balanced cords to be used in cabling according to ISO/IEC 11801 and provides test methods and associated requirements to demonstrate the performance and reliability of these balanced cords during their operational lifetime. This International Standard may also be used for providing test methods for assessing the behaviour of other balanced cords. This third edition cancels and replaces the second edition published in 2005. It differs from the second edition in that it covers category 6A to category 7A cords as defined in ISO/IEC 11801.

Spécification relative aux essais des câblages symétriques et coaxiaux des technologies de l'information - Partie 2: Cordons tels que spécifiés dans l'ISO/CEI 11801 et normes associées

La CEI 61935-2:2010 fournit des méthodes en vue de s'assurer de la compatibilité des cordons à paires symétriques à utiliser dans les câblages selon l'ISO/IEC 11801, ainsi que des méthodes d'essai et leurs exigences associées pour démontrer les performances et la fiabilité de ces cordons à paires symétriques au cours de leur durée de vie opérationnelle. La présente Norme internationale peut également être utilisée en vue de fournir des méthodes d'essai pour l'évaluation du comportement d'autres cordons à paires symétriques. Cette troisième édition annule et remplace la deuxième édition publiée en 2005. Elle diffère de la deuxième édition en ce qu'elle couvre les cordons de catégorie 6A à catégorie 7A, comme défini dans l'ISO/IECEI 11801.

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IEC 61935-2
Edition 3.0 2010-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specification for the testing of balanced and coaxial information technology
cabling –
Part 2: Cords as specified in ISO/IEC 11801 and related standards
Spécification relative aux essais des câblages symétriques et coaxiaux des
technologies de l’information –
Partie 2: Cordons tels que spécifiés dans l’ISO/CEI 11801
et normes associées
IEC 61935-2:2010
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61935-2
Edition 3.0 2010-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specification for the testing of balanced and coaxial information technology
cabling –
Part 2: Cords as specified in ISO/IEC 11801 and related standards
Spécification relative aux essais des câblages symétriques et coaxiaux des
technologies de l’information –
Partie 2: Cordons tels que spécifiés dans l’ISO/CEI 11801
et normes associées
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 33.040.20; 33.120.20 ISBN 978-2-88912-001-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61935-2 © IEC:2010
CONTENTS

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

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

1 Scope...............................................................................................................................7

2 Normative references .......................................................................................................7

3 Terms and definitions .......................................................................................................8

4 General requirements and test configuration ....................................................................8

4.1 Cable and connector design ....................................................................................8

4.2 Balanced cord, cable and connector tests ...............................................................8

4.3 Test configuration and equipment............................................................................8

4.4 Balanced cord tests requirements ...........................................................................9

5 Acceptance tests ............................................................................................................10

5.1 Visual inspection ...................................................................................................10

5.2 Wire map...............................................................................................................11

5.3 Propagation delay .................................................................................................12

5.4 Delay skew............................................................................................................12

5.5 Insertion loss.........................................................................................................12

5.6 Return loss............................................................................................................12

5.7 Near end crosstalk (NEXT)....................................................................................13

5.8 Assumptions used in the development of cord requirements..................................16

6 Balanced cord test procedure – Network analyser test configuration ..............................16

7 Periodic tests .................................................................................................................17

7.1 General .................................................................................................................17

7.2 Tensile strength ....................................................................................................17

7.3 Flexure..................................................................................................................18

7.4 Bending.................................................................................................................19

7.5 Twisting.................................................................................................................19

7.6 Crushing ...............................................................................................................20

7.7 Dust test................................................................................................................21

7.8 Coupling attenuation .............................................................................................23

7.9 Climatic sequence .................................................................................................24

8 Test head requirements..................................................................................................24

8.1 General .................................................................................................................24

8.2 Minimum requirements for all test head designs ....................................................24

8.3 Additional FEXT requirements for balanced connector compatible test heads........25

8.4 Additional return loss requirements for balanced connector compatible test

heads ....................................................................................................................25

8.5 NEXT loss centering requirements for balanced connector compatible test

heads ....................................................................................................................25

Bibliography..........................................................................................................................27

---------------------- Page: 4 ----------------------
61935-2 © IEC:2010 – 3 –
Figure 1 – Test configuration for balanced cord for NEXT and return loss

measurements ........................................................................................................................9

Figure 2 – Correct pairing .....................................................................................................11

Figure 3 – Incorrect pairing ...................................................................................................11

Figure 4 – Initial marking of the cable sheath........................................................................17

Figure 5 – Final visual inspection..........................................................................................17

Figure 6 – Fixture for balanced cord flexure test ...................................................................18

Figure 7 – Bending test: assembly in U shape ......................................................................19

Figure 8 – Twisting test: assembly in U shape ......................................................................20

Figure 9 – Fixture for cable crushing test ..............................................................................21

Figure 10 – Measuring device ...............................................................................................23

Figure 11 – Centering of NEXT properties of the balanced connector test head ....................26

Table 1 – Return loss requirements ......................................................................................13

Table 2 – Balanced cord return loss requirements at key frequencies ...................................13

Table 3 – Category 5 balanced cord NEXT requirements at key frequencies.........................15

Table 4 – Category 6 balanced cord NEXT requirements at key frequencies.........................15

Table 5 – Category 6 balanced cord NEXT requirements at key frequencies ......................15

Table 6 – Category 7 balanced cord NEXT requirements at key frequencies.........................15

Table 7 – Category 7 balanced cord NEXT requirements at key frequencies ......................15

Table 8 – Assumptions for cabling components used in the development of NEXT and

return loss requirements .......................................................................................................16

Table 9 – Coupling attenuation limits ....................................................................................23

---------------------- Page: 5 ----------------------
– 4 – 61935-2 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATION FOR THE TESTING OF BALANCED AND
COAXIAL INFORMATION TECHNOLOGY CABLING –
Part 2: Cords as specified in ISO/IEC 11801 and related standards
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

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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

International Standard IEC 61935-2 has been prepared by IEC technical committee 46:

Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and

accessories.
This third edition cancels and replaces the second edition published in 2005.

This third edition of IEC 61935-2 differs from the second edition in that it covers category 6

to category 7 cords as defined in ISO/IEC 11801.
---------------------- Page: 6 ----------------------
61935-2 © IEC:2010 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
46/351/FDIS 46/364/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
The French version of this standard has not been voted upon.

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

A list of all parts of the IEC 61935 series, under the general title: Specification for the testing

of balanced and coaxial information technology cabling, can be found on the IEC website.

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

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

the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – 61935-2 © IEC:2010
INTRODUCTION

Balanced cords are constructed for connecting equipment using free connectors according to

IEC 60603-7 series, IEC 61076-3-104 and IEC 61076-3-110. It is known that connecting

hardware performance is subject to influence by the properties of the free connector

termination and therefore balanced cords should be tested to determine the quality of the

assembly. Moreover, the performance of balanced cords may differ due to the performances

of the involved separate components depending upon the efficiency of the manufacturing

procedure. Manufacturing procedures also impact upon the reliability of these balanced cords.

Therefore, the primary object of this standard is to provide test methods to ensure

compatibility of balanced cords to be used in cabling according to ISO/IEC 11801. Another

object is to provide test methods and associated requirements to demonstrate the

performance and reliability of these balanced cords during their operational lifetime.

The test methods described in this standard may also be used for any balanced cords that

include twisted pairs terminated at each end.
---------------------- Page: 8 ----------------------
61935-2 © IEC:2010 – 7 –
SPECIFICATION FOR THE TESTING OF BALANCED AND
COAXIAL INFORMATION TECHNOLOGY CABLING –
Part 2: Cords as specified in ISO/IEC 11801 and related standards
1 Scope

This International Standard provides methods to ensure compatibility of balanced cords to be

used in cabling according to ISO/IEC 11801 and provides test methods and associated

requirements to demonstrate the performance and reliability of these balanced cords during

their operational lifetime. This International Standard may also be used for providing test

methods for assessing the behaviour of other balanced cords.
2 Normative references

The following referenced documents are indispensable for the application 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 60068-2-61, Environmental testing – Part 2: Test methods – Test Z/AMB: Climatic

sequence

IEC 60603-7 (all parts), Connectors for electronic equipment – Part 7: Detail specifications

IEC 60603-7:2008, Connectors for electronic equipment – Part 7: Detail specification for 8-

way, unshielded, free and fixed connectors

IEC 60603-7-51, Connectors for electronic equipment – Part 7-51: Detail specification for 8-

way, shielded, free and fixed connectors, for data transmission with frequencies up to 500

MHz

IEC 61076-3-104, Connectors for electronic equipment – Product requirements – Part 3-104:

Detail specification for 8-way, shielded free and fixed connectors for data transmissions with

frequencies up to 1000 MHz

IEC 61076-3-110, Connectors for electronic equipment – Product requirements – Part 3-110:

Rectangular connectors – Detail specification for shielded, free and fixed connectors for data

transmission with frequencies up to 1000 MHz

IEC 61156 (all parts), Multicore and symmetrical pair/quad cables for digital communications

IEC 61156-1, Multicore and symmetrical pair/quad cables for digital communications – Part 1:

Generic specification

IEC 61156-6, 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

IEC 61935-1:2009, Specification for the testing of balanced and coaxial information

technology cabling – Part 1: Installed balanced cabling as specified in ISO/IEC 11801 and

related standards
---------------------- Page: 9 ----------------------
– 8 – 61935-2 © IEC:2010

IEC 612153-4-11, Metallic communication cable test methods – Part 4-11: Electromagnetic

compatibility (EMC) – Coupling attenuation or screening attenuation of patch cords, coaxial

cable assemblies, pre-connectorized cables – Absorbing clamp method
ISO/IEC 11801, Information technology – Generic cabling for customer premises
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61935-1 and the

following apply.
3.1
cord
a cable assembly as defined in IEC 61935-1 whatever its targeted use

NOTE In this document, the usage of balanced cord covers, amongst others, work area cord, patch cord and

equipment cord. The terminology “modular plug cord” is an alternative expression.

4 General requirements and test configuration
4.1 Cable and connector design

When compliance with ISO/IEC 11801 is required, the design of the cables and connectors

should conform to the applicable parts of IEC 61156 and IEC 60603-7, IEC 61076-3-110 and

IEC 61076-3-104 respectively.
4.2 Balanced cord, cable and connector tests

For balanced cords complying with ISO/IEC 11801, cables and connectors used in cable

assemblies should be assessed separately in accordance with IEC 61156-1 and IEC 60603-7,

IEC 61076-3-104 or IEC 61076-3-110 respectively. These component tests do not need to be

repeated on the balanced cord, but the terminated contact height should be assessed (e.g.

dimension K2 of Table 1 of IEC 60603-7).

For other cords, the cables and connectors shall be assessed separately according to their

respective standard unless there are no component standards. In this case, all tests will be

performed on the cords, including interface tests. The acceptance tests described in this

document shall be performed on a balanced cord on a lot-by-lot basis.

The periodic tests described in this document are type tests that have to be performed

according to the quality system of the manufacturer.
4.3 Test configuration and equipment

The reference measurement procedures that are described in this standard require the use of

a network analyser, coaxial interface cables, r.f. transformers (baluns), twisted pair test leads

and impedance matching terminations. Refer to IEC 61935-1 for requirements of test

equipment, including baluns (see 4.2.6 of IEC 61935-1). The nominal impedance for the test

set-up and the terminations is 100 Ω. The same tests may be used for 120 Ω and 150 Ω

cords, but the measurement methods have not been evaluated for these nominal impedance

values.
---------------------- Page: 10 ----------------------
61935-2 © IEC:2010 – 9 –

The test configuration includes termination test heads at each end of the cord. For NEXT and

return loss, the test configuration is as shown in Figure 1. The terminals on the test heads

interface with the test equipment. Refer to IEC 61935-1 for detailed connection diagrams. All

pairs shall be terminated with differential plus common mode terminations per IEC 61935-1.

Resistive type terminations are preferred.
4 5
IEC 1351/10
Key
1 test interface 5 cord under test
2 network analyser (receiver, in –50 Ω) 6 ground plane
3 near end test head 7 far end test head
4 balun

Figure 1 – Test configuration for balanced cord for NEXT and return loss measurements

4.4 Balanced cord tests requirements

The test methods described in this specification characterise balanced cords according to

ISO/IEC 11801. They may be also used for other cords. For certification purposes, the test

schedule refers to these tests.
The cord test requirements include tests that can be performed on each cord or

representative samples produced, and tests that are only performed on representative

samples of cords. The sampling only tests (known as periodic tests) include:
• tensile strength;
• flexure;
• bending/twisting;
• crushing;
• dust test;
---------------------- Page: 11 ----------------------
– 10 – 61935-2 © IEC:2010
• climatic sequence;
• coupling attenuation.
The periodic tests are described in detail in Clause 7.
The acceptance tests that can be performed on each cord include:
• visual inspection;
• wire map;
• return loss;
• pair-to-pair NEXT.

If all components used to assemble the cord are not assured to be compliant to their

respective component standards, the following additional tests should be performed:

• insertion loss (attenuation);
• propagation delay;
• delay skew;
• d.c. resistance;
• d.c. resistance unbalance.

The requirements to be verified on each cord are described in detail in Clause 5.

Balanced cords shall meet the transmission requirements of its designated category and, with

appropriate test heads, the transmission requirements of all lower categories, e.g. a category

7 balanced cord shall meet the:
• category 7 requirements when tested with a category 7 test head;
A A
• category 7 requirements when tested with a category 7 test head;
• category 6 requirements when tested with a category 6 test head;
A A
• category 6 requirements when tested with a category 6 test head;
• category 5 requirements when tested with a category 5 test head.
5 Acceptance tests
5.1 Visual inspection

Visual inspection of balanced cords shall be performed by visual inspection with normal or

corrected vision without any additional magnification:
• the condition, workmanship and finish are satisfactory;
• the marking, when specified in the relevant specification, is legible;

• mechanical damage is absent and there is no undesired movement or displacement of

parts;
• flaking of materials or finishes is absent;
• the length as specified.
---------------------- Page: 12 ----------------------
61935-2 © IEC:2010 – 11 –
5.2 Wire map

A conductor map test is intended to verify correct pin termination at each end and to check for

installation connectivity errors. For each of the conductors in the cable, and the screen(s), if

any, the conductor map indicates
• continuity to the remote end;
• shorts between any two or more conductors/screen(s);
• transposed pairs;
• reversed pairs;
• split pairs;
• any other connection errors.

Correct connectivity of telecommunications outlet/connectors is defined in ISO/IEC 11801 (or

Figure 2 (for four pair cables).
equivalent), and is illustrated in
1 1
2 2
3 3
6 6
5 5
4 4
7 7
8 8
Screen Screen
IEC 1229/09
Figure 2 – Correct pairing

A reversed pair occurs when the polarity of one pair is reversed at one end of the balanced

cord (also called a tip/ring reversal). See Figure 3a for an illustration of a reversed pair.

A transposed pair occurs when the two conductors in a pair are connected to the position for

a different pair at the remote connection. See Figure 3b for an illustration of transposed pairs.

NOTE Transposed pairs are sometimes referred to as crossed pairs.

Split pairs occur when pin to pin continuity is maintained but physical pairs are separated.

See Figure 3c for an illustration of split pairs.
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3
6 6 6 6 6
5 5 5 5 5 5
4 4 4 4 4 4
7 7 7 7 7 7
8 8 8 8 8 8
Screen Screen Screen Screen Screen Screen
IEC 1230/09 IEC 1231/09 IEC 1232/09
Figure 3a – Reversed pair
Figure 3b – Transposed pairs
Figure 3c – Split pairs
Figure 3 – Incorrect pairing
---------------------- Page: 13 ----------------------
– 12 – 61935-2 © IEC:2010

If the balanced cord wire map test is conformant, then a “pass” shall be reported.

5.3 Propagation delay

Propagation delay is assumed to be met by design when using cables and connectors that

comp
...

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