ISO 19642-12:2023

Road vehicles - Automotive cables - Part 12: Dimensions and requirements for unscreened twisted pair RF cables with a specified analogue bandwidth up to 1 GHz

This document specifies the dimensions and requirements for unscreened single twisted pair RF cables with a specified analogue bandwidth up to 1 GHz intended for use in road vehicle applications where the nominal system voltage is 30 V a.c. or 60 V d.c.

Véhicules routiers — Câbles automobiles — Partie 12: Dimensions et exigences pour les câbles RF en paire torsadée non blindés de bande passante analogique spécifiée jusqu'à 1 GHz

General Information

• Status: Published
• Publication Date: 25-May-2023
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Drafting Committee: ISO/TC 22/SC 32/WG 4 - Automotive electrical cables
• Current Stage: 6060 - International Standard published
• Start Date: 26-May-2023
• Due Date: 11-Mar-2023
• Completion Date: 26-May-2023

Overview

ISO 19642-12:2023 specifies dimensions and performance requirements for unscreened single twisted-pair RF (UTP / JUTP) cables for road-vehicle applications with a specified analogue bandwidth up to 1 GHz. The standard targets cables intended for vehicle electrical systems with nominal voltages of 30 V a.c. or 60 V d.c. and defines test methods, construction features and pass/fail criteria applicable to in-vehicle RF signal links.

Key topics and technical requirements

This part of the ISO 19642 series covers:

• Scope and general conditions
  • Intended use in road vehicles, nominal system voltage limits and general test conditions.
• Cable construction and designators
  • Requirements for cores, twisted-pair geometry, optional separator and outer sheath.
• Dimensional requirements
  • Outside diameter, insulation thickness, conductor diameter, CSA, lay length and ovality criteria.
• Electrical requirements and RF performance
  • Low‑frequency electrical tests (conductor resistance, continuity, insulation resistivity, withstand voltage).
  • RF tests including characteristic impedance (frequency and time domain), insertion loss (IL), return loss (RL), velocity of propagation and unbalance attenuations.
• Mechanical tests
  • Strip force, break force, cyclic/dynamic bending, minimum bending radius, abrasion and flexibility tests.
• Environmental tests
  • Ageing (long term 3 000 h and short term 240 h at temperature class rating), thermal overload, pressure tests, shrinkage, cold impact, humidity cycling, resistance to water, chemicals, ozone, flame propagation and durability of markings.
• Representative element testing
  • Procedures to select representative cable elements for testing and reference test setups.

Practical applications

ISO 19642-12:2023 is specifically useful where reliable RF signal transmission up to 1 GHz is required in automotive environments, such as:

• In-vehicle infotainment links, antenna feeders and interconnects
• Camera and sensor cabling for driver-assistance systems (where analogue RF links are used)
• On-board test and measurement harnesses and prototype vehicle integrations

Compliance ensures predictable electrical performance, mechanical robustness and environmental durability under typical automotive service conditions.

Who should use this standard

• Automotive cable manufacturers and designers
• OEM vehicle electrical architects and component engineers
• Test laboratories performing electrical, RF and environmental qualification
• Suppliers specifying in-vehicle RF interconnects and harness integrators

Related standards

• Other parts of the ISO 19642 series covering automotive cable families and related tests
• Relevant ISO/IEC test methods and automotive electrical/EMC test standards used alongside ISO 19642-12 for complete qualification

Keywords: ISO 19642-12:2023, automotive cables, unscreened twisted pair RF cables, 1 GHz, in-vehicle RF, UTP, JUTP, characteristic impedance, insertion loss, environmental testing.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 19642-12
First edition
2023-05
Road vehicles — Automotive cables —
Part 12:
Dimensions and requirements for
unscreened twisted pair RF cables
with a specified analogue bandwidth
up to 1 GHz
Véhicules routiers — Câbles automobiles —
Partie 12: Dimensions et exigences pour les câbles RF en paire
torsadée non blindés de bande passante analogique spécifiée jusqu'à
1 GHz
Reference number
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword . vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specifications . 1
4.1 General test conditions . 1
4.2 Safety concerns . 2
4.3 Voltage rating . 2
4.4 Temperature classes . 2
4.5 Cable construction . 2
4.5.1 Single Cores . 2
4.5.2 Twisted pair . 3
4.5.3 Separator . 3
4.5.4 Sheath . 3
4.6 Cable designators . 3
4.7 Representative cable elements testing . 4
4.8 Reference and requirements for the tests. 4
4.9 General remark on requirements . 4
5 Requirements for the cable’s dielectric cores . 4
5.1 General . 4
5.2 Dimensional tests . . 4
5.2.1 Cable outside diameter . 4
5.2.2 Insulation thickness . 5
5.2.3 Conductor diameter . 5
5.2.4 Cross sectional area (CSA) . 5
5.2.5 In-process cable outside diameter . 5
5.3 Electrical tests . 5
5.3.1 Conductor resistance . . 5
5.3.2 Determination of temperature coefficients . 5
5.3.3 Withstand voltage . 5
5.3.4 Withstand voltage after environmental testing . 5
5.3.5 Insulation faults . 5
5.3.6 Insulation volume resistivity . 6
5.4 Mechanical tests . 6
5.4.1 Strip force . 6
5.4.2 Abrasion . 6
5.4.3 Breaking force of the finished cable. 6
5.4.4 Cyclic bending . 6
5.4.5 Flexibility . 6
5.5 Environmental tests . 6
5.5.1 Test specimen preparation and winding tests . 6
5.5.2 Long term heat ageing, 3 000 h, at temperature class rating . 6
5.5.3 Short term heat ageing, 240 h at temperature class rating +25 K . 6
5.5.4 Thermal overload, 6 h at temperature class rating + 50 K . 6
5.5.5 Pressure test at high temperature . 6
5.5.6 Shrinkage by heat . 6
5.5.7 Low temperature winding . 7
5.5.8 Cold impact . 7
5.5.9 Temperature and humidity cycling . 7
5.5.10 Resistance to hot water . 7
5.5.11 Resistance to liquid chemicals . 7
iii
5.5.12 Durability of cable marking . 7
5.5.13 Stress cracking resistance . 7
5.5.14 Resistance to ozone . 7
5.5.15 Resistance to flame propagation . 7
6 Requirements for the finished UTP or JUTP cables . 7
6.1 General . 7
6.2 Dimensional tests . . 7
6.2.1 Cable outside diameter for JUTP cables . 7
6.2.2 Ovality of sheath for JUTP cables. 8
6.2.3 Thickness of sheath for JUTP cables . 8
6.2.4 In-process cable outside diameter for JUTP cables . 8
6.2.5 Lay length . 8
6.3 Electrical tests . 8
6.3.1 Electrical continuity . 8
6.3.2 Withstand voltage at final inspection . 8
6.3.3 Screening effectiveness . 8
6.3.4 Sheath fault on screened cables . 8
6.3.5 General information on electrical test setups of unscreened balanced cables . 8
6.3.6 General information on low frequency electrical tests . 8
6.3.7 Resistance unbalance . 8
6.3.8 Capacitance . 9
6.3.9 Inductance . . 9
6.3.10 General information on radio frequency (RF) electrical tests . 9
6.3.11 Velocity of propagation . . 9
6.3.12 Characteristic impedance in frequency domain (CIF). 10
6.3.13 Characteristic impedance in time domain (CIT) . 10
6.3.14 Insertion loss, IL . 10
6.3.15 Return loss, RL . 10
6.3.16 Unbalance attenuations . 10
6.4 Mechanical tests . 10
6.4.1 Strip force of sheath. 10
6.4.2 Cyclic bending . 11
6.4.3 Flexibility . 11
6.4.4 Cyclic bending test for RF cables . 11
6.4.5 Dynamic bending tests for RF cables . 11
6.4.6 Test for assessment of minimum bending radius. 11
6.4.7 Strip force of screen . 11
6.4.8 Abrasion test of sheath . 11
6.5 Environmental tests . 11
6.5.1 Test specimen preparation and winding tests . 11
6.5.2 Long term heat ageing, 3 000 h at temperature class rating . 11
6.5.3 Short term heat ageing, 240 h at temperature class rating + 25 °C .12
6.5.4 Thermal overload, 6 h at temperature class rating + 50 °C . .12
6.5.5 Pressure test at high temperature .12
6.5.6 Shrinkage by heat of sheath .12
6.5.7 Low temperature winding .12
6.5.8 Cold impact . 12
6.5.9 Temperature and humidity cycling .12
6.5.10 Resistance to liquid chemicals .12
6.5.11 Durability of sheath marking .12
6.5.12 Resistance to ozone .12
6.5.13 Artificial weathering .13
6.5.14 Resistance to flame propagation . 13
7 Test overview tables .13
7.1 Test table for single cores . 13
7.2 Test tables for finished cables . 14
8 Cable types .17
iv
8.1 Cable parameters . 17
8.2 Application requirements . 19
8.2.1 CAN . 19
8.2.2 CAN FD . 19
8.2.3 FlexRay . 19
8.2.4 100BASE-T1 Ethernet . 21
8.2.5 1000BASE-T1 Ethernet . 25
Annex A (normative) Colour combinations .29
Bibliography .30
v
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had received notice of
(a) patent(s) which may be required to implement this document. However, implementers are cautioned
that this may not represent the latest information, which may be obtained from the patent database
available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent
rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
A list of all parts in the ISO 19642 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
vi
Introduction
This document has been added to existing standards in the ISO 19642 series. It was prepared following
a joint resolution to improve the general structure of the ISO Automotive Electric Cable standards. This
new structure adds more clarity and, by defining a new standard family, opens up the standard for
future amendments.
Many other standards currently refer to ISO 6722-1, ISO 6722-2 and ISO 14572. Therefore, these
standards will stay valid at least until the next scheduled systematic review and will be replaced later
on by the ISO 19642 series.
For new automotive cable projects customers and suppliers are advised on using the ISO 19642 series.
vii
INTERNATIONAL STANDARD ISO 19642-12:2023(E)
Road vehicles — Automotive cables —
Part 12:
Dimensions and requirements for unscreened twisted pair
RF cables with a specified analogue bandwidth up to 1 GHz
WARNING — The use of this document may involve hazardous materials, operations, and
equipment. This document does not purport to address all of the safety concerns, if any, associated
with its use. It is the responsibility of the user of this document to establish appropriate safety
practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This document specifies the dimensions and requirements for unscreened single twisted pair RF cables
with a specified analogue bandwidth up to 1 GHz intended for use in road vehicle applications where
the nominal system voltage is 30 V a.c. or 60 V d.c.
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.
ISO 19642-1, Road vehicles — Automotive cables — Part 1: Terminology and design guidelines
1)
ISO 19642-2:— , Road vehicles — Automotive cables — Part 2: Test methods
ISO 19642-3, Road vehicles — Automotive cables — Part 3: Dimensions and requirements for 30 V a.c. or
60 V d.c. single core copper conductor cables
ISO 21111-8:2022, Road vehicles — In-vehicle Ethernet — Part 8: Electrical 100-Mbit/s Ethernet
transmission media, components and tests
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19642-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Specifications
4.1 General test conditions
The test conditions of ISO 19642-2 shall apply. The descriptions of the tests are found in ISO 19642-2.
This document only contains requirements and specific remarks. The cables shall be submitted to the
tests as specified in Clause 7.
1) Second edition under preparation. Stage at the time of publication: ISO/PRF 19642-2:2023.
The single cores of the UTP cable shall meet the requirements of ISO 19642-3. Dimensions and conductor
definitions may be different, but shall be documented in the test report.
If suppliers and customers agree upon modifications or changes to the methods and requirements, it is
required that all the changes and modifications are clearly documented.
NOTE The clause numbers in this document are aligned with the clause numbers in ISO 19642-2. Test clause
numbers not needed in this document are identified as “Test is not required” or “Test is not possible”.
4.2 Safety concerns
See the “Warning" at the beginning of this document.
4.3 Voltage rating
The voltage rating is established by the rating of the cores 30 V a.c. or 60 V d.c.
4.4 Temperature classes
The temperature class rating is established by the rating(s) of the core and sheath. The rating of the
cable shall be equal to the lowest rating of the core and sheath. For details on temperature classes, see
ISO 19642-1.
4.5 Cable construction
For detailed information on preferred constructions please refer to Table 9 and Table 10. Other
constructions and materials are permissible when agreed between customer and supplier.
4.5.1 Single Cores
4.5.1.1 Conductor
4.5.1.1.1 Conductor material
For conductor materials see ISO 19642-3 and for additional materials see Table 1.
Table 1 — Additional permissible conductor materials
Specification Conductor material
Copper magnesium alloy
(CuMg02)
CEN/TS 13388
Copper silver alloy (CuAg01)
Copper tin alloy (CuSn03)
ASTM B452 Copper clad steel (CCS)
ASTM B105 Copper alloy
4.5.1.1.2 Conductor construction
For conductor construction of the core see ISO 19642-3 and Table 9 and Table 10.
4.5.1.1.3 Maximum conductor outside diameter
For conductor construction requirements of preferred cable types, refer to Table 9 and Table 10. If
possible, use maximum conductor outside diameter values as specified in ISO 19642-3.
4.5.1.2 Insulation material
The material used shall be documented in the supplier data sheet.
4.5.1.3 Maximum outside diameter of the single cores
The maximum and minimum diameter of the single cores depend upon the specified impedance and
may not follow the specifications according to ISO 19642-3. If different, outside diameters and minimal
wall thickness shall be documented in the supplier data sheet.
4.5.2 Twisted pair
4.5.2.1 Lay length
The lay length shall be documented in the supplier data sheet.
4.5.2.2 Diameter of twisted pair
For JUTP cables the diameter of the twisted pair is referenced as inner diameter of sheath.
4.5.3 Separator
If a separator is used, it shall be documented in the supplier data sheet. The description shall contain
information about type of material, e.g. PP foil, PETP foil, powder, etc.
4.5.4 Sheath
4.5.4.1 Sheath material
The sheath material shall be a flame retardant polymer compound or an intrinsically non-flammable
polymer. The material used shall be documented in the supplier data sheet.
4.5.4.2 Sheath thickness
For sheathed cables, different sheath thicknesses are allowed per this document.
For new constructions it is recommended to define the thickness of the sheath according to
2)
ISO 19642-1:— , Annex A.
4.6 Cable designators
For the definition of the cable designators see Table 2.
For reference numbers of preferred cable types refer to Table 9 and Table 10.
2) Second edition under preparation. Stage at the time of publication: ISO/PRF 19642-1:2023.
Table 2 — Cable designator description
Designator Valid entries Comment
UTP unshielded twisted pair cable without a sheath
construction
JUTP Jacketed unshielded twisted pair cable with a sheath
delimiter -
impedance 100, 120, … nominal value of the differential RF cable impedance
delimiter -
reference # 1, 2, 3, … up to 3-digit reference number to identify similar cable types
lower case version designator to differentiate between similar con-
version a
structions
delimiter white space delimiter
# of cores 2x 2x for pair
CSA of cores 0,13 cross sectional area of cores [mm ]
EXAMPLE JUTP-100 -11a 2x0,13.
4.7 Representative cable elements testing
When a test is required, all combinations of different cable elements shall meet the appropriate
requirements. However, if testing of representative cable elements is permitted, compliance for cables
with different dimensions, but with the same insulation and sheath compound, may be demonstrated by
testing samples of the cable with the thinnest sheath wall thickness only. For all other cables a reduced
test procedure is acceptable. The remaining mandatory tests for initial certification shall be performed
following Tables 4 to 7.
4.8 Reference and requirements for the tests
All tests are defined in ISO 19642-2. This document only contains requirements and specific remarks.
4.9 General remark on requirements
Requirements for preferred unscreened single pair RF cable types are specified in Table 9 and Table 10.
The requirements for other unscreened single pair RF cable types shall be as agreed between customer
and supplier.
5 Requirements for the cable’s dielectric cores
5.1 General
The cable’s dielectric cores shall be tested according to ISO 19642-2 at the cable temperature class
rating. Tests on the dielectric cable cores in JUTP cables shall be performed according to Table 4.
For any UTP cable the cores shall meet all requirements of ISO 19642-3, dimensions may be different
but shall be identified in the test report.
NOTE For preferred cable types refer to Table 9 and Table 10.
5.2 Dimensional tests
5.2.1 Cable outside diameter
The dielectric core outside diameter shall meet the required tolerances in Table 9 and Table 10.
5.2.2 Insulation thickness
The insulation thickness shall be checked and documented against the supplier datasheet.
5.2.3 Conductor diameter
No single value shall be outside the required tolerances in Table 9 and Table 10.
5.2.4 Cross sectional area (CSA)
No single value shall be outside the required tolerances in Table 9 and Table 10.
5.2.5 In-process cable outside diameter
In-process cable outside diameter monitoring is mandatory. No single value shall be outside the
required tolerances in Table 9 and Table 10.
5.3 Electrical tests
5.3.1 Conductor resistance
No single value shall be outside the required tolerances in Table 9 and Table 10. The conductor resistance
in Table 9 and Table 10 includes the twisting loss. For determination of maximum conductor resistance
refer to the design guidelines in ISO 19642-1:—, A.5.
5.3.2 Determination of temperature coefficients
Test is not required.
5.3.3 Withstand voltage
5.3.3.1 Test voltage
After applying the test voltage of 1 kV a.c. for 30 min, no ramp up of the voltage is required.
5.3.3.2 Requirement
Breakdown shall not occur.
5.3.4 Withstand voltage after environmental testing
5.3.4.1 Test voltage
The test voltage is 1 kV a.c., hold for 1 min.
5.3.4.2 Requirement
Breakdown shall not occur.
5.3.5 Insulation faults
All cores shall be subjected to the inline insulation faults test during the extrusion process.
5.3.5.1 Test voltage
The test voltage is 1 kV a.c.
5.3.5.2 Requirement
Breakdown shall not occur.
5.3.6 Insulation volume resistivity
The value shall be ≥ 1 × 10 Ω∙× mm.
5.4 Mechanical tests
5.4.1 Strip force
The measured force shall be within the values as agreed between customer and supplier.
5.4.2 Abrasion
Test is not required.
5.4.3 Breaking force of the finished cable
Test is not required.
5.4.4 Cyclic bending
Test is not required.
5.4.5 Flexibility
Test is not required.
5.5 Environmental tests
5.5.1 Test specimen preparation and winding tests
Test is not required.
5.5.2 Long term heat ageing, 3 000 h, at temperature class rating
Test is not required.
5.5.3 Short term heat ageing, 240 h at temperature class rating +25 K
Test is not required.
5.5.4 Thermal overload, 6 h at temperature class rating + 50 K
Test is not required.
5.5.5 Pressure test at high temperature
If no conductor is visible, perform a withstand voltage after environmental testing as given in 5.3.4.
During 5.3.3.2 a withstand voltage after environmental testing breakdown shall not occur.
5.5.6 Shrinkage by heat
The maximum shrinkage shall not exceed 2 mm from either end.
5.5.7 Low temperature winding
After winding, no conductor shall be visible. During 5.3.3.2 a withstand voltage after environmental
testing breakdown shall not occur.
5.5.8 Cold impact
Test is not required.
5.5.9 Temperature and humidity cycling
Test is not required.
5.5.10 Resistance to hot water
Test is not required.
5.5.11 Resistance to liquid chemicals
Test is not required.
5.5.12 Durability of cable marking
Test is not required.
5.5.13 Stress cracking resistance
Test is not required.
5.5.14 Resistance to ozone
Test is not required.
5.5.15 Resistance to flame propagation
Test is not required.
6 Requirements for the finished UTP or JUTP cables
6.1 General
The cables shall be tested per ISO 19642-2 according to their temperature class rating. UTP cables shall
be submitted to the tests as specified in Table 5. JUTP cables shall be submitted to the tests as specified
in Table 6. Tests according to Table 5 are not required for JUTP cables.
6.2 Dimensional tests
6.2.1 Cable outside diameter for JUTP cables
Measure the following parameters if applicable:
— outside diameter of twisted cores;
— outside diameter of sheath.
No single value shall be greater than the maximum value in Table 10.
6.2.2 Ovality of sheath for JUTP cables
Ovality shall be < 10 %.
NOTE Sheath ovality can be different after handling due to mechanical deformation.
6.2.3 Thickness of sheath for JUTP cables
No single value shall be less than the minimum value in Table 10.
6.2.4 In-process cable outside diameter for JUTP cables
In-process cable outside diameter monitoring is mandatory.
No single value shall be greater than the maximum value in Table 10.
6.2.5 Lay length
The lay length shall be checked and documented against the supplier datasheet.
6.3 Electrical tests
6.3.1 Electrical continuity
The indicator shall show continuity.
6.3.2 Withstand voltage at final inspection
Breakdown shall not occur between core(s) when applying a test voltage of 1 kV a.c. or d.c. to be
measured at the end of the test specimen for a minimum of 3 s.
6.3.3 Screening effectiveness
Test is not possible.
6.3.4 Sheath fault on screened cables
Test is not possible.
6.3.5 General information on electrical test setups of unscreened balanced cables
Perform the low and high frequency tests using the test setups defined in 8.2.
6.3.5.1 Test set ups for unscreened balanced cables
For long time ageing no special test setup is defined. RF parameters are measured at the start and after
the end of the ageing only. RF tests where a ground reference is needed shall use test setup 3 or 4.
6.3.6 General information on low frequency electrical tests
Information is not provided in this edition.
6.3.7 Resistance unbalance
Test is not possible.
6.3.8 Capacitance
6.3.8.1 General information
Information is not provided in this edition.
6.3.8.2 Samples
Information is not provided in this edition.
6.3.8.3 Mutual capacitance
If applicable, no single value shall fall outside the tolerances specified in Table 9 and Table 10.
This property is also used for the calculation of the characteristic impedance according to 6.3.12.
6.3.9 Inductance
Test is not required.
6.3.10 General information on radio frequency (RF) electrical tests
Submit a new cable, which was not subjected to any prior environmental stress, to the RF tests in Table 7.
Test the cable again after applied stresses according to the requirements in Table 8 and subsequent
environmental test descriptions. The measurements shall be performed at room temperature. At least
three samples shall be measured for this test.
If not otherwise defined the test shall be performed with a start frequency of 10 MHz and a stop
frequency of 120 % of the analogue bandwidth defined for the cable types in Table 9 and Table 10.
6.3.11 Velocity of propagation
6.3.11.1 General
3)
Perform the tests for unbalanced cables following ISO 19642-2:— , 6.3.11.1.2.
6.3.11.2 Phase velocity v (f) of propagation
p
If applicable, no single value shall fall outside the tolerances specified in 8.2. This property is also used
for the calculation of the characteristic impedance according to 6.3.12.
6.3.11.3 Group velocity v (f) of propagation
g
Test is not required.
6.3.11.4 Intra-pair skew for symmetrical data transmission
Test is not required.
6.3.11.5 In-pair skew for symmetrical data transmission
Test is not required.
6.3.11.6 Propagation delay
If applicable, no single value shall fall outside the tolerances specified in 8.2.
3) Second edition under preparation. Stage at the time of publication: ISO/PRF 19642-2:2023.
6.3.12 Characteristic impedance in frequency domain (CIF)
6.3.12.1 Unbalanced cables (CICMF)
Test is not possible.
6.3.12.2 Balanced cables (CIDMF)
This test gives an overview of the impedance of the cable depicted over the applied frequency but no
information on the impedance at different lengths from the input into the cable. This is the preferred
method. If applicable, no single value shall fall outside the tolerances specified in 8.2.
6.3.13 Characteristic impedance in time domain (CIT)
6.3.13.1 Unbalanced cables (CICMT)
Test is not possible.
6.3.13.2 Balanced cables (CIDMT)
This test gives an overview of the impedance of the cable depicted over the length of the sample but
no information on the influence of different frequencies. If applicable, no single value in the evaluation
window shall fall outside the tolerances specified in 8.2. The difference of the results on the new cable
and on the cable after stresses must not be greater than the related tolerances in Table 9 and Table 10.
6.3.14 Insertion loss, IL
6.3.14.1 Unbalanced cables
Test is not possible.
6.3.14.2 Balanced cables
If applicable, no single value shall fall outside the tolerances specified in 8.2.
6.3.15 Return loss, RL
6.3.15.1 Unbalanced cables
Test is not possible.
6.3.15.2 Balanced cables
If applicable, no single value shall fall outside the tolerances specified in 8.2.
6.3.16 Unbalance attenuations
If applicable, no single value shall fall outside the tolerances specified in 8.2.
6.4 Mechanical tests
6.4.1 Strip force of sheath
The undisturbed section of the sheath shall be able to be removed from the interior cores. The
requirement for this test shall be established by agreement between customer and supplier.
6.4.2 Cyclic bending
The requirement for this test shall be established by agreement between customer and supplier.
6.4.3 Flexibility
The requirement for this test shall be established by agreement between customer and supplier.
6.4.4 Cyclic bending test for RF cables
The requirement for this test shall be established by agreement between customer and supplier.
6.4.5 Dynamic bending tests for RF cables
Test is not required.
6.4.6 Test for assessment of minimum bending radius
Test is not required.
6.4.7 Strip force of screen
Test is not possible.
6.4.8 Abrasion test of sheath
This test is only possible for JUTP cables. The requirement for this test shall be established by agreement
between customer and supplier.
6.5 Environmental tests
6.5.1 Test specimen preparation and winding tests
ISO 19642-2:—, 6.5.1 describes the mandrel sizes used for preparation of specimens in different
subsequent environmental tests.
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