ISO 20860-1:2008

Road vehicles - 50 ohms impedance radio frequency connection system interface - Part 1: Dimensions and electrical requirements

ISO 20860-1:2008 specifies male and female connectors of the 50 ohms impedance system interface for radio frequency applications in road vehicles, and ensures communication to and within road vehicles. It specifies dimensional and electrical requirements and characteristics required for interchange ability. This connection system can be applied in all relevant equipment and cable connections of road vehicles.

Véhicules routiers — Interface de système de connexion de radiofréquence d'une impédance de 50 ohms — Partie 1: Dimensions et exigences électriques

General Information

• Status: Published
• Publication Date: 14-Oct-2008
• 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 6 - On-board electrical connections
• Current Stage: 9093 - International Standard confirmed
• Start Date: 08-Jul-2024
• Completion Date: 13-Dec-2025

Overview

ISO 20860-1:2008 defines the mechanical and electrical characteristics of a 50 Ω impedance radio frequency (RF) connection system interface for road vehicles. It specifies the male and female coaxial connectors, their dimensions, coding options, and key electrical characteristics to ensure interchangeability across vehicle equipment and cable assemblies. This part focuses on dimensions and electrical requirements; test procedures are covered in ISO 20860-2.

Key topics and technical requirements

• Connector geometry and coding
  • Detailed dimensional drawings for male (cable connector CC and connector on apparatus CA) and female (FCC) connectors.
  • Mechanical coding ribs and arrangements for physical keying and colour coding (RAL references) to prevent mismating.
  • Support for multiple-interface designs (dual connectors Type X and Type Y).
• Electrical characteristics
  • Nominal impedance: 50 Ω.
  • Frequency range: 0 GHz to 4 GHz.
  • Return loss, insertion loss and shielding effectiveness requirements (measurement zones defined).
  • Dielectric withstand voltage: minimum 500 V.
  • Working voltage/current: ≤ 60 V DC and ≤ 1 A DC.
  • Insulation resistance: 1 000 MΩ before strain, 500 MΩ after strain.
  • Contact resistance: centre and outer contacts ≤ 5 mΩ before, ≤ 40 mΩ after 25 matings.
• Mechanical performance
  • Insertion and extraction forces ≤ 25 N; locking strength and strain relief values defined.
  • Minimum mating cycles: 25.
  • Material/coating guidance: gold (Au) for centre contact coating; nickel (Ni) or tin (Sn) for outer contact coating.
• Designations and interchangeability
  • Standardized naming conventions (e.g., ISO 20860 CC–H) to simplify procurement and documentation.

Applications

ISO 20860-1 is applicable wherever reliable RF connections are needed in vehicles:

• Vehicle antennas (cellular, GPS, AM/FM, satellite)
• Telematics and infotainment modules
• RF cable harnesses and interface assemblies
• Antenna distribution systems and repeaters inside vehicles
• Connector suppliers, OEMs, and tier‑1 automotive electronics manufacturers specifying compatible RF interfaces

Who uses it:

• Automotive engineers and systems integrators
• RF connector and cable manufacturers
• Test laboratories and QA teams verifying mechanical/electrical conformance
• Procurement and standards compliance groups at OEMs and suppliers

Related standards

• ISO 20860-2 (Test procedures for this interface)
• IEC 60169-1 (RF connectors - general requirements and measuring methods)
• DIN 47299-1 (RF coaxial connector terminology and coupling)
• RAL 840‑HR (colour reference for codings)

Keywords: ISO 20860-1, 50 ohm impedance, RF connector, automotive RF interface, coaxial interface, dimensions and electrical requirements, vehicle antenna connectors, RF interchangeability.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20860-1
First edition
2008-10-15
Road vehicles — 50 Ω impedance radio
frequency connection system interface —
Part 1:
Dimensions and electrical requirements
Véhicules routiers — Interface de système de connexion de fréquence
radio de 50 Ω —
Partie 1: Dimensions et exigences électriques

Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved

Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Dimensions and coding . 2
4.1 General. 2
4.2 Male connector. 2
4.3 Female connector . 2
4.4 Coding ribs . 2
4.5 Mechanical and colour codings of the connection system. 2
4.6 Multiple interfaces . 2
5 Designations . 9
6 Characteristic values. 9
7 Test procedures . 11
Bibliography . 12

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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 20860-1 was prepared by Technical Committee ISO/TC 22, Road vehicles.
ISO 20860 consists of the following parts, under the general title Road vehicles — 50 Ω impedance radio
frequency connection system interface:
⎯ Part 1: Dimensions and electrical requirements
⎯ Part 2: Test procedures
iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 20860-1:2008(E)

Road vehicles — 50 Ω impedance radio frequency connection
system interface —
Part 1:
Dimensions and electrical requirements
1 Scope
This part of ISO 20860 specifies male and female connectors of the 50 Ω impedance system interface for
radio frequency applications in road vehicles, and ensures communication to and within road vehicles.
It specifies dimensional and electrical requirements and characteristics required for interchange ability.
This connection system can be applied in all relevant equipment and cable connections of road vehicles.
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.
ISO 20860-2, Road vehicles — 50 Ω impedance radio frequency connection system interface — Part 2: Test
procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
male contact
pin contact
contact intended to make electrical engagement on its outer surface and which will enter a female contact
(socket)
3.2
...