IEC 60603-7-51:2010

Connectors for electronic equipment - Part 7-51: Detail specification for 8-way, shielded, free and fixed connectors, for data transmissions with frequencies up to 500 MHz

IEC 60603-7-51:2010 covers 8-way, shielded, free and fixed connectors, references dimensional, mechanical, electrical and environmental characteristics and tests in IEC 60603-7, and specifies electrical transmission requirements, including power sum alien (exogenous) crosstalk, for frequencies up to 500 MHz. These connectors are intermateable and interoperable with other IEC 60603-7 series connectors as defined in Clause 2 of IEC 60603-7-1. These connectors are backward compatible with other IEC 60603-7 series connectors.

Connecteurs pour équipements électroniques - Partie 7-51: Spécification particulière pour les fiches et les embases blindées à 8 voies pour la transmission de données à des fréquences jusqu'à 500 MHz

La CEI 60603-7-51:2010 couvre les fiches et les embases blindées à 8 voies et spécifie les exigences dimensionnelles, mécaniques, électriques et environnementales ainsi que les essais dans la CEI 60603-7 et elle spécifie les exigences de transmission électrique y compris la puissance de diaphonie exogène cumulée pour des fréquences jusqu'à 500 MHz. Ces connecteurs sont accouplables et interopérables avec les autres connecteurs de la série CEI 60603-7 comme cela est défini à l'Article 2 de la CEI 60603-7-1. Ces connecteurs offrent une compatibilité amont avec les autres connecteurs de la série CEI 60603-7.

General Information

• Status: Published
• Publication Date: 09-Mar-2010
• ICS: 31.220.10 - Plug-and-socket devices. Connectors
• Technical Committee: SC 48B - Electrical connectors
• Current Stage: PPUB - Publication issued
• Start Date: 10-Mar-2010
• Completion Date: 15-Mar-2010

Overview

IEC 60603-7-51:2010 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies detailed requirements for 8-way, shielded connectors used in electronic equipment. Particularly designed for data transmissions with frequencies up to 500 MHz, this standard addresses free and fixed connectors widely utilized in Category 6 class E cabling systems as per ISO/IEC 11801 specifications.

The standard builds upon the base framework established in IEC 60603-7 and focuses on electrical transmission performance, mechanical, environmental, and dimensional characteristics. Importantly, the connectors covered by IEC 60603-7-51 are interoperable and intermateable with other connectors from the IEC 60603-7 series while maintaining backward compatibility, ensuring seamless integration within diverse electronic systems.

Key Topics

• Connector Type and Configuration: The standard applies exclusively to 8-way shielded connectors, both free (plug) and fixed (receptacle), designed for optimized high-frequency data transmission.

• Transmission Frequency Scope: Performance is specified for signals up to 500 MHz, making these connectors suitable for high-speed data communication applications.

• Electrical Performance Requirements: The standard highlights critical electrical parameters including insertion loss, return loss, propagation delay, delay skew, and various crosstalk characteristics such as Near-End Crosstalk (NEXT), Far-End Crosstalk (FEXT), and alien crosstalk. Power sum alien (exogenous) crosstalk limits are specifically defined to ensure signal integrity in dense cabling environments.

• Mechanical & Environmental Characteristics: Compliance with mechanical durability, environmental conditions, and standardized test procedures specified in IEC 60603-7 ensures robust performance under real-world operating conditions.

• Interoperability and Backward Compatibility: Connectors conforming to IEC 60603-7-51 are fully intermateable with other IEC 60603-7 series connectors and comply with the backward compatibility requirements, facilitating upgrades and system maintenance without requiring new infrastructure.

• Testing and Validation: The standard includes comprehensive test methods and schedules covering resistance, vibration, environmental aging, and signal integrity tests, following IEC 60512 and associated signal integrity testing protocols.

Applications

IEC 60603-7-51 connectors are essential components in various electronic and communication systems requiring reliable, high-speed data transmission. Typical applications include:

• Structured cabling systems adhering to Category 6 (Class E) performance standards for enterprise Local Area Networks (LANs).

• Data communication equipment such as switches, routers, and network interface cards, where high-frequency shielding is critical to prevent electromagnetic interference (EMI).

• Industrial and instrumentation environments needing robust, shielded connectors capable of maintaining signal quality under mechanical stress and varying climatic conditions.

• Interconnect solutions in telecommunication infrastructure supporting frequencies up to 500 MHz.

• Systems requiring backward compatible connectors to upgrade transmission capabilities without complete hardware overhauls.

Related Standards

IEC 60603-7-51 references and complements several important standards to ensure comprehensive applicability and compliance:

• IEC 60603-7: The base specification for connectors for electronic equipment, offering dimensional, mechanical, electrical, and environmental characteristics and tests.

• IEC 60603-7-1: Detail specification for 8-way shielded free and fixed connectors, referenced for dimensions and pin configuration.

• ISO/IEC 11801: International standard defining categories for structured cabling systems; specifically Category 6 (Class E) is pertinent to this IEC standard.

• IEC 60512 Series: Specifies test methods and measurements relevant to connector performance, including signal integrity tests for alien crosstalk and power sum crosstalk.

• IEC 61156 Series: Covers multicore and symmetrical pair/quad cables for digital communications, complementary to connector standards ensuring overall system performance.

---

For professionals in electrical and electronic equipment design, network infrastructure, and quality assurance, adherence to IEC 60603-7-51 guarantees connector solutions that meet rigorous international performance and compatibility standards. Utilizing these connectors enhances data transmission reliability, minimizes signal degradation, and supports next-generation communication systems.

Standards Content (Sample)

IEC 60603-7-51 ®
Edition 1.0 2010-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electronic equipment –
Part 7-51: Detail specification for 8-way, shielded, free and fixed connectors,
for data transmissions with frequencies up to 500 MHz

Connecteurs pour équipements électroniques –
Partie 7-51: Spécification particulière pour les fiches et les embases blindées
à 8 voies pour la transmission de données à des fréquences jusqu'à 500 MHz

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IEC 60603-7-51 ®
Edition 1.0 2010-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electronic equipment –
Part 7-51: Detail specification for 8-way, shielded, free and fixed connectors,
for data transmissions with frequencies up to 500 MHz

Connecteurs pour équipements électroniques –
Partie 7-51: Spécification particulière pour les fiches et les embases blindées
à 8 voies pour la transmission de données à des fréquences jusqu'à 500 MHz

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 31.220.10 ISBN 978-2-88910-234-1
– 2 – 60603-7-51 © IEC:2010
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 General .7
1.1 Scope.7
1.2 Normative references .7
2 Terms and definitions .8
3 Common features and isometric view .8
4 Cable terminations and internal connections – Fixed and free connectors .8
5 Gauges .8
6 Characteristics .8
6.1 General .8
6.2 Pin and pair grouping assignment. .8
6.3 Classification into climatic category.8
6.4 Electrical characteristics.8
6.5 Transmission characteristics .8
6.5.1 General .8
6.5.2 Insertion loss.9
6.5.3 Return loss .9
6.5.4 Propagation delay .9
6.5.5 Delay skew.9
6.5.6 NEXT loss .9
6.5.7 Power sum NEXT loss (for information only).9
6.5.8 FEXT Loss.10
6.5.9 Power sum FEXT loss (for information only) .10
6.5.10 Transverse conversion loss .10
6.5.11 Transverse conversion transfer loss .10
6.5.12 Power Sum Alien (Exogenous) NEXT .10
6.5.13 Power Sum Alien (Exogenous) FEXT.11
6.6 Mechanical.11
7 Tests and test schedule.11
7.1 General .11
7.2 Arrangement for contact resistance test .11
7.3 Arrangement for vibration test .11
7.4 Test procedures and measuring methods .11
7.5 Preconditioning .11
7.6 Wiring and mounting of specimens .12
7.6.1 Wiring.12
7.6.2 Mounting .12
7.7 Test schedules .12
7.7.1 Basic (minimum) test schedule .12
7.7.2 Full test schedule .12
Bibliography.14

60603-7-51 © IEC:2010 – 3 –
Table 1 – Test Group EP .13

– 4 – 60603-7-51 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRONIC EQUIPMENT –

Part 7-51: Detail specification for 8-way, shielded, free and fixed
connectors, for data transmissions with frequencies up to 500 MHz

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,
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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 60603-7-51 has been prepared by subcommittee 48B: Connectors,
of IEC technical committee 48: Electromechanical components and mechanical structures for
electronic equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
48B/2093/FDIS 48B/2143/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

60603-7-51 © IEC:2010 – 5 –
A list of all parts of the IEC 60603 series, under the general title Connectors for electronic
equipment, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date 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.
– 6 – 60603-7-51 © IEC:2010
INTRODUCTION
IEC 60603-7 is the base specification of the whole series. Subsequent specifications do not
duplicate information given in the base document, but list only additional requirements. For
complete specification regarding a component of a higher number document all lower
numbered documents shall be considered as well. The following diagram shows the
interrelation of the documents:

Unshielded Shielded
IEC 60603-7 IEC 60603-7-1
3 MHz
100 MHz
IEC 60603-7-2 IEC 60603-7-3
IEC 60603-7-4 IEC 60603-7-5
250 MHz
IEC 60603-7-41 IEC 60603-7-51
500 MHz
600 MHz
Indicates reference for IEC 60603-7-7
dimensions, mechanical and
electrical characteristics,
tests and test schedules
IEC 60603-7-71
1 000 MHz
Indicates reference for
transmission performance
(backward compatibility)
IEC 327/10
60603-7-51 © IEC:2010 – 7 –
CONNECTORS FOR ELECTRONIC EQUIPMENT –

Part 7-51: Detail specification for 8-way, shielded, free and fixed
connectors, for data transmissions with frequencies up to 500 MHz

1 General
1.1 Scope
This part of IEC 60603 covers 8-way, shielded, free and fixed connectors, references
dimensional, mechanical, electrical and environmental characteristics and tests in
IEC 60603-7, and specifies electrical transmission requirements, including power sum alien
(exogenous) crosstalk, for frequencies up to 500 MHz.
These connectors are typically used as category 6 connectors in class E cabling systems
A A
specified in ISO/IEC 11801.
These connectors are intermateable and interoperable with other IEC 60603-7 series
connectors as defined in Clause 2 of IEC 60603-7-1.
These connectors are backward compatible with other IEC 60603-7 series connectors.
NOTE Transmission performance categories: in this IEC standard, the term “category”, when used in reference to
transmission performance, refers to those categories defined by ISO/IEC 11801.
1.2 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 60512-1-100, Connectors for electronic equipment – Tests and measurements – Part 1-
100: General – Applicable publications
IEC 60512-25-9, Connectors for electronicl equipment – Tests and measurements – Part 25-9:
Signal integrity tests – Test 25i: Alien crosstalk
IEC 60512-27-100 , Connectors for electronic equipment – Tests and measurements – Part
27-100: Signal integrity tests up to 500 MHz on IEC 60603-7 series connectors – Tests 27a to
27g
EC 60603-7:2008, Connectors for electronic equipment – Part 7: Detail specification for 8-way,
unshielded, free and fixed connectors
IEC 60603-7-1:2009, Connectors for electronic equipment – Part 7: Detail specification for 8-
way, shielded, free and fixed connectors
IEC 61156 (all parts), Multicore and symmetrical pair/quad cables for digital communications
___________
To be published.
– 8 – 60603-7-51 © IEC:2010
2 Terms and definitions
For the purposes of this document, the terms and definitions of Clause 2 of IEC 60603-7,
apply as well as the following.
2.1
backward compatibility
the backward compatibility requirement ensures that a free or fixed connector which is in
compliance with this standard, mated with a fixed or free connector in compliance with any
lower frequency IEC 60603-7 series connector, fully complies with the requirements of the
lower frequency IEC 60603-7 series connector
3 Common features and isometric view
See Clause 3 of IEC 60603-7-1 for dimensions, views and requirements.
4 Cable terminations and internal connections – Fixed and free connectors
See Clause 4 of IEC 60603-7-1 for cable termination and internal connections types.
5 Gauges
The gauges as defined by Clause 5 of IEC 60603-7-1 shall apply.
6 Characteristics
6.1 General
Connectors according to IEC 60603-7-51 shall also conform to all relevant requirements
specified by IEC 60603-7-1.
6.2 Pin and pair grouping assignment
The pin and pair grouping assignment of 6.2 of IEC 60603-7 applies.
6.3 Classification into climatic category
Connectors according to IEC 60603-7-51 are classified in the same climatic categories as
defined by IEC 60603-7.
6.4 Electrical characteristics
Connectors according to IEC 60603-7-51 shall also conform to the electrical characteristics
specified by IEC 60603-7-1.
6.5 Transmission characteristics
6.5.1 General
Compliance to this standard in respect to transmission characteristics, is determined
according to specific test methods described in test group EP, see Table 1. The
interoperability of connectors compliant to this standard shall be demonstrated by testing the
fixed connectors with the full range of free connectors according to future IEC 60512-27-100,
Compliance to this standard in respect to the alien (exogenous) crosstalk is determined
according to specific test methods described in IEC 60512-25-9.

60603-7-51 © IEC:2010 – 9 –
All transmission performance requirements apply between the reference planes specified in
future IEC 60512-27-100.
NOTE In the following subclauses f is the frequency expressed in MHz.
6.5.2 Insertion loss
Conditions:
IEC 60512, test 27a
Mated connectors
All pairs: ≤ 0,02x f dB from 1 MHz to 500 MHz.
Whenever the formula results in a value less than 0,1 dB, the requirement shall revert
to 0,1 dB.
6.5.3 Return loss
Conditions:
IEC 60512, test 27b
Mated connectors
All pairs: ≥ 68-20log (f) dB from 1 MHz to 500 MHz .
Whenever the formula results in a value greater than 30 dB, the requirement shall
revert to 30 dB.
6.5.4 Propagation delay
All pairs: ≤ 2,5 ns
Propagation delay test does not need to be performed, since it is assumed that
connectors comply by design.
6.5.5 Delay skew
All pair combinations: ≤ 1,25 ns
NOTE This characteristic is calculated from the individual propagation delay measurements and, as with
propagation delay (6.5.4), it is assumed that connectors comply by design.
6.5.6 NEXT loss
Conditions:
IEC 60512, test 27c
Mated connectors
All pair combinations: ≥ 94-20log (f) dB from 1 MHz to 250 MHz .
All pair combinations: ≥ 46,04 -30log (f/250) dB from 250 MHz to 500 MHz .
Whenever the formula results in a value greater than 75 dB, the requirement shall
revert to 75 dB.
6.5.7 Power sum NEXT loss (for information only)
Conditions:
Mated connectors,
−NEXT
n ik
PS NEXT = −10log 10
k ∑
i=1,i≠k
All pairs: ≥ 90-20log (f) dB from 1 MHz to 250 MHz .

– 10 – 60603-7-51 © IEC:2010
All pairs: ≥ 42,04-30log (f/250) dB from 250 MHz to 500 MHz .
NOTE This characteristic is calculated from the individual NEXT loss measurements and connector compliance is
achieved by compliance to the NEXT loss requirements (6.5.6).
6.5.8 FEXT Loss
Conditions:
IEC 60512, test 27d
Mated connectors
All pair combinations: ≥ 83,1-20log (f) dB from 1 MHz to 500 MHz .
Whenever the formula results in a value greater than 75 dB, the requirement shall
revert to 75 dB.
6.5.9 Power sum FEXT loss (for information only)
Conditions:
Mated connectors,
−FEXT
n ik
PS FEXT = −10log 10
k ∑
i=1,i≠k
All pairs: ≥ 80,1-20*log (f) dB from 1 MHz to 500 MHz .
NOTE This characteristic is calculated from the individual FEXT loss measurements and connector compliance is
achieved by compliance to the FEXT loss requirements (6.5.8).
6.5.10 Transverse conversion loss
Conditions:
IEC 60512, test 27f
Mated connectors
All pairs: ≥ 68-20log (f) dB from 1 MHz to 500 MHz .
Whenever the formula results in a value greater than 50 dB, the requirement shall
revert to 50 dB.
6.5.11 Transverse conversion transfer loss
Conditions:
IEC 60512, test 27g
Mated connectors
All pairs: ≥ 68-20log (f) dB from 1 MHz to 500 MHz .
Whenever the formula results in a value greater than 50 dB, the requirement shall
revert to 50 dB.
6.5.12 Power Sum Alien (Exogenous) NEXT
Conditions:
IEC 60512, test 25i
Mated connectors
−ANEXT
kij
N 4
⎡ ⎤
PS ANEXT = −10log 10
⎢ ⎥
∑∑
k
j=1 i=1
⎢ ⎥
⎣ ⎦
60603-7-51 © IEC:2010 – 11 –
All pairs: ≥ 110,5 – 20log(f) dB from 1 MHz to 500 MHz.
Whenever the formula results in a value greater than 72 dB, the requirement shall revert to
72 dB.
NOTE Power Sum Alien (Exogenous) NEXT cannot be determined by a mated connector in isolation. Connector
compliance is achieved by assessing a connector’s performance when mounted in accordance with the
manufacturer’s installation instructions for each mounting type assessed and in relation to all other significant
connectors in close proximity (see IEC 60512-25-9).
6.5.13 Power Sum Alien (Exogenous) FEXT
Conditions:
IEC 60512, test 25i
Mated connectors
−AFEXT
kij
N 4
⎡ ⎤
PS AFEXT = −10log 10
⎢ ⎥
k ∑∑
j=1 i=1
⎢ ⎥
⎣ ⎦
All pairs: ≥ 107 – 20log(f) dB from 1 MHz to 500 MHz.
Whenever the formula results in a value greater than 72 dB, the requirement shall revert to
72 dB.
NOTE Power Sum Alien (Exogenous) FEXT cannot be determined by a mated connector in isolation. Connector
compliance is achieved by assessing a connector’s performance when mounted in accordance with the
manufacturer’s installation instructions for each mounting type assessed and in relation to all other significant
connectors in close proximity (see IEC 60512-25-9).
6.6 Mechanical
Connectors according to IEC 60603-7-51 shall also conform to the mechanical characteristics
specified by IEC 60603-7-1.
7 Tests and test schedule
7.1 General
See 7.1 of IEC 60603-7.
7.2 Arrangement for contact resistance test
For useful information regarding contact resistance tests see 7.2 of IEC 60603-7-1.
7.3 Arrangement for vibration test
For useful information regarding the principle of vibration tests see 7.3 of IEC 60603-7.
7.4 Test procedures and measuring methods
See 7.4 of IEC 60603-7.
7.5 Preconditioning
See 7.5 of IEC 60603-7.
– 12 – 60603-7-51 © IEC:2010
7.6 Wiring and mounting of specimens
7.6.1 Wiring
Wiring of these connectors shall take into account the wire and cable diameter of the cables
defined in the IEC 61156 series as applicable by manufacturer’s specification.
7.6.2 Mounting
See 7.6.2 of IEC 60603-7.
7.7 Test schedules
The test parameters required shall not be less than those listed in Clause 6.
7.7.1 Basic (minimum) test schedule
Not applicable.
7.7.2 Full test schedule
7.7.2.1 General
In addition to the test schedule of IEC 60603-7-1, one further group of two sets of mated
connectors is required for group EP. The free connectors for group EP shall additionally meet
the requirements of the future IEC 60512-27-100 and IEC 60512-25-9.
NOTE Additional sets of connectors are required for the Alien (Exogenous) NEXT and FEXT (EP10 and EP11)
measurements according to IEC 60512-25-9.
7.7.2.2 Test group P preliminary
All the test group specimens shall be subjected to the preliminary group P of IEC 60603-7 and
the preliminary group P of IEC 60603-7-1.
7.7.2.3 Test group AP
See 7.7.2.3 of IEC 60603-7 and 7.7.2.3 of IEC 60603-7-1.
7.7.2.4 Test group BP
See 7.7.2.4 of IEC 60603-7 and 7.7.2.4 of IEC 60603-7-1.
7.7.2.5 Test group CP
See 7.7.2.5 of IEC 60603-7 and 7.7.2.5 of IEC 60603-7-1.
7.7.2.6 Test group DP
See 7.7.2.6 of IEC 60603-7 and 7.7.2.6 of IEC 60603-7-1.

60603-7-51 © IEC:2010 – 13 –
7.7.2.7 Test group EP
Table 1 – Test Group EP
Test Test Measurement to be performed
phase
Title IEC 60512 Severity or Title IEC 60512 Requirements
Test No. condition of test Test No.

EP1  All pairs, one Insertion loss Test 27a Per 6.5.2
direction
EP2  All pairs, both NEXT loss Test 27c Per 6.5.6
directions, (pair to
pair)
EP3  All pairs, both Return loss Test 27b Per 6.5.3
directions
EP4  All pairs, both FEXT loss Test 27d Per 6.5.8
directions, (pair to
pair)
EP5  All pairs, both TCL Test 27f Per 6.5.10
directions
EP6  All pairs, both TCTL Test 27g Per 6.5.11
directions
EP7 Input to output Measurement points Millivolt level Test 2a Per 6.4.5.
resistance as defined in 6.4.5 method
All input/output
connector paths
EP8 Resistance Measurement points Millivolt level Test 2a Per 6.4.6
unbalanc
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