ISO 21111-4:2020

INTERNATIONAL ISO
STANDARD 21111-4
First edition
2020-03
Road vehicles — In-vehicle Ethernet —
Part 4:
General requirements and test
methods of optical gigabit Ethernet
components
Véhicules routiers — Ethernet embarqué —
Partie 4: Exigences générales et méthodes de test des composants
optiques pour l'Ethernet gigabit
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 3
5 1000BASE-RHC components . 4
6 Header connector . 5
6.1 Dimension criteria . 5
6.2 Mechanical coding . 8
6.3 Requirements of header connector . 9
6.4 Evaluation .10
6.4.1 High storage temperature exposure .10
6.4.2 Low storage temperature exposure .10
6.4.3 Operating temperature range .11
7 Cable connector .11
7.1 Cable plug .11
7.1.1 Dimension criteria .11
7.1.2 Mechanical coding .13
7.2 Cable socket .13
7.2.1 Dimension criteria .13
7.2.2 Mechanical coding .16
7.3 Requirements of cable connector .16
7.4 Evaluation .16
7.4.1 High storage temperature exposure .16
7.4.2 Low storage temperature exposure .17
7.4.3 Operation temperature range (informative) .17
8 POF and POF cable .17
8.1 POF .17
8.2 Requirements of POF .17
8.3 Outline of POF .18
8.3.1 Cladding diameter .18
8.3.2 Numerical aperture .18
8.3.3 Attenuation .19
8.4 POF cable .20
8.5 Requirements of POF cable .21
8.6 Evaluation .22
8.6.1 High storage temperature exposure .22
8.6.2 Low storage temperature exposure .22
8.6.3 Operation temperature range .23
8.6.4 Minimum bending radius .23
8.6.5 Maximum bending attenuation .24
8.6.6 Tensile strength .25
8.6.7 Crush .26
8.6.8 Edge impact .27
8.6.9 Static torsion .28
8.6.10 Resistance to flame propagation .29
9 Optical channel.30
9.1 General .30
9.2 Optical harness (informative) .30
9.3 Positions of test points .31
9.4 Requirements .31
9.4.1 Electrical characteristics .31
9.4.2 Optical characteristics .32
9.4.3 Physical characteristics .32
9.4.4 Temperature environmental characteristics .33
9.4.5 Combined environment examination .33
9.4.6 Specific environmental examination .33
9.5 Methodology (informative) .34
9.5.1 Light source setup .34
9.5.2 Excitation, test setup and measurement equipment .34
9.5.3 Harness setup .35
9.6 Evaluation (characteristics of photoelectric conversion) .36
9.6.1 Optical PMD transmitter input electrical interface .36
9.6.2 Optical PMD receiver output electrical interface .38
9.7 Evaluation (optical characteristics) .40
9.7.1 Minimum average output power at TP2 .40
9.7.2 Extinction ratio at TP2 .40
9.7.3 EAF profile at TP2 .41
9.7.4 Minimum average output power at TP2’ .41
9.7.5 Minimum average output power at TP3 .43
9.7.6 Range of optical input power at TP3’ .43
9.7.7 Maximum coupling attenuation at optical in-line .45
9.8 Evaluation (physical characteristics).46
9.8.1 Minimum retention force .46
9.8.2 Maximum insertion force .47
9.8.3 Maximum unlock and release force .48
9.8.4 Durability of repeated mating and unmating . .48
9.8.5 Maximum cable holding force .49
9.9 Evaluation (temperature environmental characteristics) .49
9.9.1 High storage temperature exposure .49
9.9.2 Low storage temperature exposure .50
9.9.3 High operation temperature exposure .50
9.9.4 Low operation temperature exposure .51
9.10 Evaluation (combined environmental examination) .51
9.10.1 General.51
9.10.2 Flow chart of environmental load tests for optical PMD transmitter .51
9.10.3 Operation test after durability of mate and un-mate .52
9.10.4 Operation test after high temperature exposure .52
9.10.5 Operation test after temperature and vibration .53
9.10.6 Operation test after heat shock .53
9.10.7 Operation test after humidity/temperature cycle procedure .54
9.10.8 Operation test after specific vibration profile .54
9.10.9 Requirement of combined environmental examination .54
9.11 Evaluation (specific environmental examination) .55
9.11.1 General.55
9.11.2 Individual environmental load tests for optical harness .55
9.11.3 Operation test after specific physical impact .55
9.11.4 Operation test after chemical durability procedure .55
9.11.5 Operation test after Noxious gas exposure .56
9.11.6 Operation test after specific dust condition exposure .56
9.11.7 Operation test after specific drop procedure .56
9.11.8 Requirements of specific environmental examination .57
Annex A (informative) System power budget .58
Annex B (informative) Mode filter .60
Bibliography .62
iv © ISO 2020 – All rights reserved

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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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 21111 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 © ISO 2020 – All rights reserved

Introduction
The ISO 21111 series includes in-vehicle Ethernet requirements and test plans that are disseminated in
other International Standards and complements them with additional test methods and requirements.
The resulting requirement and test plans are structured in different documents following the Open
Systems Interconnection (OSI) reference model and grouping the documents that depend on the
physical media and bit rate used.
In general, the Ethernet requirements are specified in ISO/IEC/IEEE 8802-3. The ISO 21111 series
provides supplemental specifications (e.g. wake-up, I/O functionality), which are required for in-vehicle
Ethernet applications. In road vehicles, Ethernet networks are used for different purposes requiring
different bit-rates. Currently, the ISO 21111 series specifies the 1-Gbit/s optical and 100-Mbit/s
electrical physical layer.
The ISO 21111 series contains requirement specifications and test methods related to the in-vehicle
Ethernet. This includes requirement specifications for physical layer entity (e.g. connectors, physical
layer implementations) providers, device (e.g. electronic control units, gateway units) suppliers, and
system (e.g. network systems) designers. Additionally, there are test methods specified for conformance
testing and for interoperability testing.
Safety (electrical safety, protection, fire, etc.) and electromagnetic compatibility (EMC) requirements
are out of the scope of the ISO 21111 series.
The structure of the specifications given in the ISO 21111 series complies with the Open Systems
[13] [14]
Interconnection (OSI) reference model specified in ISO/IEC 7498-1 and ISO/IEC 10731 .
ISO 21111-1 defines the terms which are used in this series of standards and provides an overview of
the standards for in-vehicle Ethernet including the complementary relations to ISO/IEC/IEEE 8802-3,
the document structure, type of physical entities, in-vehicle Ethernet specific functionalities and so on.
ISO 21111-2 specifies the interface between reconciliation sublayer and physical entity including
reduced gigabit media independent interface (RGMII), and the common physical entity wake-up and
synchronized link sleep functionalities, independent from physical media and bit rate.
ISO 21111-3 specifies supplemental requirements to a physical layer capable of transmitting
1-Gbit/s over plastic optical fibre compliant with ISO/IEC/IEEE 8802-3, with specific application to
communications inside road vehicles, and a test plan for physical entity conformance testing.
This document specifies the optical components requirements and test methods for 1-Gbit/s optical in-
vehicle Ethernet.
ISO 21111-5 specifies, for 1-Gbit/s optical in-vehicle Ethernet, requirements on the physical layer at
system level, requirements on the interoperability test set-ups, the interoperability test plan that checks
the requirements for the physical layer at system level, requirements on the device-level physical layer
conformance test set-ups, and device-level physical layer conformance test plan that checks a set of
requirements for the OSI physical layer that are relevant for device vendors.
ISO 21111-6 specifies advanced features of an ISO/IEC/IEEE 8802-3 in-vehicle Ethernet physical layer
(often also called transceiver), e.g. for diagnostic purposes for in-vehicle Ethernet physical layers. It
specifies advanced physical layer features, wake-up and sleep features, physical layer test suite,
physical layer control requirements and conformance test plan, physical sublayers test suite and
physical sublayers requirements and conformance test plan.
ISO 21111-7 specifies the implementation for ISO/IEC/IEEE 8802-3:2017/Amd 1:2017, which defines
the interface implementation for automotive applications together with requirements on components
used to realize this Bus Interface Network (BIN). ISO 21111-7 also defines further testing and system
requirements for systems implemented according to the system specification. In addition, ISO 21111-7
defines the channels for tests of transceivers with a test wiring harness that simulates various electrical
communication channels.
ISO 21111-8 specifies the transmission media, the channel performance and the tests for
ISO/IEC/IEEE 8802-3 in-vehicle Ethernet.
ISO 21111-9 specifies the data link layer requirements and conformance test plan. It specifies the
requirements and test plan for devices and systems with bridge functionality.
ISO 21111-10 specifies the application to network layer requirements and test plan. It specifies the
requirements and test plan for devices and systems that include functionality related with OSI layers
from 3 to 7.
Figure 1 shows the parts of the ISO 21111 series and the document structure.
Figure 1 — In-vehicle Ethernet document reference according to OSI model
viii © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 21111-4:2020(E)
Road vehicles — In-vehicle Ethernet —
Part 4:
General requirements and test methods of optical gigabit
Ethernet components
1 Scope
This document specifies the optical components requirements and test methods for optical gigabit
transmission of in-vehicle Ethernet. Safety (electrical safety, protection, fire, etc.) and electromagnetic
compatibility (EMC) requirements are outside the scope of this document.
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/IEC/IEEE 8802-3:2017/Amd 9:2018, Physical Layer Specifications and Management Parameters for
1000 Mb/s Operation over Plastic Optical Fibre
ISO 8092-2, Road vehicles — Connections for on-board electrical wiring harnesses — Part 2: Definitions,
test methods and general performance requirements
ISO 8092-3, Road vehicles — Connections for on-board electrical wiring harnesses — Part 3: Tabs for multi-
pole connections — Dimensions and specific requirements
ISO 16750-1, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 1: General
ISO 16750-3:2012, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 3: Mechanical loads
ISO 16750-4:2010, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 4: Climatic loads
ISO 16750-5, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 5: Chemical loads
ISO 21111-1, Road vehicles — In-vehicle Ethernet —General information and definitions
IEC 60068-2-60, Environmental testing — Part 2: Tests — Test Ke: Flowing mixed gas corrosion test
IEC 60793-1-20, Optical fibres — Part 1-20: Measurement methods and test procedures — Fibre geometry
IEC 60793-1-21, Optical fibres — Part 1-21: Measurement methods and test procedures — Coating geometry
IEC 60793-1-40, Optical fibres — Part 1-40: Attenuation measurement methods
IEC 60793-2-40, Optical fibres — Part 2-40: Product specifications — Sectional specification for category
A4 multimode fibres
IEC 60793-1-43, Optical fibres — Part 1-43: Measurement methods and test procedures — Numerical
aperture measurement
IEC 60793-1-51, Optical fibres — Part 1-51: Measurement methods and test procedure – Dry heat (steady
state) tests
IEC 60794-1-21, Optical fibre cables — Part 1-21: Generic specification — Basic optical cable test
procedures — Mechanical tests methods
IEC 60794-2-41, Optical fibre cables — Part 2-41: Indoor cables — Product specification for simplex and
duplex buffered A4 fibres
IEC 61300-3-53, Fibre optic interconnecting devices and passive components — Basic test and measurement
procedures — Part 3-53: Examinations and measurements — Encircled angular flux (EAF) measurement
method based on two-dimensional far field data from step index multimode waveguide (including fibre)
ANSI/EIA 364-13, Mating and Un-mating Force Test Procedure for Electrical Connectors and Sockets
EIA 364-38, Cable pull-out test procedure for electrical connectors
EIA/TIA 455-13A, Visual and mechanical inspection of fibre optic components, devices, and assemblies
EIA/TIA 455-20A, Measurement of Change in Optical Transmittance
EIA/TIA 455-34A, Interconnection Device Insertion Loss Test
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21111-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
1000BASE-H
physical coding sublayer (PCS) and physical medium attachment (PMA) sublayers for 1 000 Mb/s
Ethernet that support physical medium dependent (PMD) using duplex plastic optical fibre
3.2
1000BASE-RHC
physical layer specification for 1 000 Mb/s Ethernet using 1000BASE-H (3.1) encoding and red light
(approximately 650 nm) PMD tailored for automotive application requirements
3.3
extinction ratio
ER
ratio of two optical power levels of a digital signal generated (high or low) by an optical source
3.4
FORx
part of an optical PMD receiver (3.10) that includes a photo detector and an amplifier
3.5
FOTx
part of an optical PMD transmitter (3.12) that includes a light emitting device and a driver
3.6
in-line connector
connector resulting of the match of a cable plug and a cable socket
2 © ISO 2020 – All rights reserved

3.7
launch optics
light source with some additional optical components
3.8
mode filter
optical filter that eliminates higher order modes in order to suppress modal dispersion
3.9
mode scrambler
optical component defined in IEC 60793-2-40
3.10
optical PMD receiver
receiver optical front end composed of a photo detector, an amplifier and a waveguide (3.15) for optical
coupling
3.11
optical PMD transceiver
optical front end composed of an optical PMD receiver (3.10) and an optical PMD transmitter (3.12)
3.12
optical PMD transmitter
transmitter optical front end composed of a light emitting device, a driver and waveguide (3.15) for
optical coupling
3.13
passive component
module that does not require energy to operate
Note 1 to entry: POF cable or optical connector as defined in Clause 7 is in this category.
3.14
system power budget
allocation of available optical power in order to ensure that adequate signal strength is available at the
receiver
Note 1 to entry: As defined in A.2.
3.15
waveguide
optical coupling device that is set between the end face of POF and the optical window of the LED or
Photodiode
4 Abbreviated terms
AOP average optical power
DUT device under test
EAF encircled angular flux
FFP far field pattern
FOT fibre optic transceiver
GEPOF gigabit ethernet over plastic optical fibre
I/F interface
LD laser diode
LED light emitting diode
MDI media dependent interface
MRP mechanical reference plane
NA numerical aperture
ORP optical reference plane
PCB printed circuit board
PCS physical coding sublayer
PMA physical media attachment
PMD physical media dependent
POF plastic optical fibre
5 1000BASE-RHC components
Figure 2 specifies the components used for the connection between two GEPOF entities that conform
to the ISO 21111 series. The 1000BASE-H transceiver component includes the functionality described
for the 1000BASE-H transmitter and receiver defined in ISO/IEC/IEEE 8802-3:2017/Amd 9 and for
the GEPOF entity in ISO 21111-3. The optical PMD transceiver component includes the functionality
described for the optical PMD transmitter and receiver defined in ISO/IEC/IEEE 8802-3:2017/Amd 9
and optical coupling elements defined in this document. These elements are enclosed in broken line in
Figure 2.
A GEPOF entity may be integrated in a single component that includes the 1000BASE-H transceiver, the
optical PMD transceiver and the cable socket. The resulting component is defined as integrated header
connector. In an alternative configuration, the GEPOF entity may be implemented by using two different
components. The first one includes the 1000BASE-H transceiver and the second one integrates the
optical PMD transceiver and the cable socket. The resulting component is defined as header connector.
Two GEPOF entities are connected through their MDI bi-directionally through a duplex POF cable or a
pair of simplex POF cables (see 8.4). The POF cable is terminated with two cable plugs that fulfils the
characteristics defined in Clause 9. The connection between two GEPOF entities may include or not one
or more in-line connectors.
4 © ISO 2020 – All rights reserved

Key
1 1000BASE-H transceiver
2 header connector
3 optical PMD transmitter
4 optical PMD receiver
5 mechanics for axis alignment
6 cable plug
7 POF cable
a
Electrical I/F between PMA and PMD.
b
Electrical I/F between PMD and PMA.
Figure 2 — 1000BASE-RHC components
6 Header connector
6.1 Dimension criteria
Two types of header connector are defined.
Type A header connector is defined in Figure 3 and type B header connector is defined in Figure 4. MRP
is used to determine a mechanical position when a header connector and a plug connector are mated.
Additionally, ORP is used to determine an optical position for the efficient optical coupling performance.
The detail H and J of type A and the detail C of type B specify the position of the tip of ferrule of the
cable plug in mated condition.
— Type A
A type A header connector shall comply with the dimensions and tolerances defined in Figure 3.
Dimensions in millimetres
Figure 3 — Header connector (type A)
— Type B
A type B header connector shall comply with the dimensions and tolerances defined in Figure 4.
6 © ISO 2020 – All rights reserved

Dimensions in millimetres
Key
1 in this area no burr permitted, COD Z as shown
Figure 4 — Header connector (type B)
6.2 Mechanical coding
Mechanical coding that prevents possible wrong connection is prepared on the header connector. A set
of different coding for each connector type A and type B is defined. Cable plug and cable socket shall
follow the mechanical coding defined in this subclause.
— Type A
Four types of mechanical coding (A, B, C, D) are defined in Figure 5 for type A.
Dimensions in millimetres
Figure 5 — Mechanical coding (type A)
— Type B
Six types of mechanical coding (A, B, C, D, E, Z) are defined in Figure 6 for type B.
8 © ISO 2020 – All rights reserved

Dimensions in millimetres
Figure 6 — Mechanical coding (type B)
6.3 Requirements of header connector
Table 1 specifies the normative references that contain requirements and test methods that the optical
components shall also comply in addition to the requirements and test methods defined in each
subclause. In case that the result of a test method in the reference over the same parameter differs from
the one defined in the subclause, the result in the reference shall prevail. Requirements of optical and
electrical characteristics are defined in Clause 9.
Table 1 — Requirements of header connector
Subclause Requirement Reference
ISO 8092-2
ISO 16750-1
6.4.1 High storage temperature exposure
ISO 16750-4
EIA/TIA 455-13A
ISO 8092-2
ISO 16750-1
6.4.2 Low storage temperature exposure
ISO 16750-4
EIA/TIA 455-13A
Table 1 (continued)
Subclause Requirement Reference
ISO 8092-2
ISO 16750-1
6.4.3 Operating temperature range ISO 16750-4
EIA/TIA 455-13A
ISO/IEC/IEEE 8802-3:2017/Amd 9
6.4 Evaluation
6.4.1 High storage temperature exposure
6.4.1.1 Purpose
Road vehicles are owned and operated in nearly all land regions of the earth. Significant variation
in environmental conditions due to climatic environment, including diurnal and seasonal cycles, can
therefore be expected. The durability test for high storage temperature is specified.
6.4.1.2 Test setup
The DUT for this durability test is a PCB with a header connector mounted on it. A programmable oven
as defined in 9.5.2 is used to expose the DUT to the defined temperature.
6.4.1.3 Test methods
The header connector dimensions before the test are measured in accordance with EIA/TIA 455-13A.
DUT is put into the programmable oven that shall be held at T . DUT is taken out of the programmable
max
oven after being held for 96 h and held for 24 h at room temperature, and the same header connector
dimensions shall be measured in the same manner as the initial measurement. An applicable test
condition shall be agreed between supplier and vehicle manufacturer. Unless otherwise provided,
designated temperature (T ) is defined in code K in ISO 16750-4:2010, Clause 4.
max
6.4.1.4 Requirement
Exposure test shall be performed at T . Header connector dimensions after durability test shall be
max
within tolerances defined in Figures 3 to 6.
6.4.2 Low storage temperature exposure
6.4.2.1 Purpose
Road vehicles are owned and operated in nearly all land regions of the earth. Significant variation
in environmental conditions due to climatic environment, including diurnal and seasonal cycles, can
therefore be expected. The durability test for low storage temperature is specified.
6.4.2.2 Test setup
The DUT for this durability test is a PCB with a header connector mounted on it. A programmable oven
as defined in 9.5.2 is used to expose the DUT to the defined temperature.
6.4.2.3 Test methods
The header connector dimensions before the test are measured in accordance with EIA/TIA 455-13A.
DUT is put into the programmable oven that shall be held at T . DUT is taken out of the programmable
min
10 © ISO 2020 – All rights reserved

oven after being held for 96 h and held for 24 h at room temperature, and the same header connector
dimensions shall be measured in the same manner as the initial measurement. An applicable test
condition shall be agreed between supplier and vehicle manufacturer. Unless otherwise provided,
designated temperature (T ) is defined in code K in ISO 16750-4:2010, Clause 4.
min
6.4.2.4 Requirement
Exposure test shall be performed at T . Header connector dimensions after durability test shall be
min
within tolerances defined in Figures 3 to 6.
6.4.3 Operating temperature range
6.4.3.1 Purpose
Road vehicles are owned and operated in nearly all land regions of the earth. Significant variation
in environmental conditions due to climatic environment, including diurnal and seasonal cycles, can
therefore be expected. Operating temperature range of a header connector is specified, and test method
is defined.
6.4.3.2 Test setup
DUT for this test consist on a PCB with a header connector mounted and powered. Unless otherwise
specified the operating mode of DUT is defined in ISO/IEC/IEEE 8802-3:2017/Amd 9:2018, 115.5 test
mode 3. A programmable oven as defined in 9.5.2 is used to expose the DUT to the defined temperature.
6.4.3.3 Test methods
The header connector dimensions before the test are measured in accordance with EIA/TIA 455-13A.
The temperature of the programmable oven shall be raised until T and lowered until T with the
max min
temperature slope of 1 °C/min, and again increased back to room temperature with the temperature
slope of 1 °C/min. An applicable test condition shall be agreed between supplier and vehicle
manufacturer. Unless otherwise provided, designated temperature (T and T ) is defined in code K
min max
in ISO 16750-4:2010, Clause 4.
6.4.3.4 Requirement
Operating temperature test shall be performed at T and T . Channel type is defined in
min max
ISO/IEC/IEEE 8802-3:2017/Amd 9:2018, 115.7. Header connector dimensions after exposure test shall
be within tolerances defined in Figures 3 or 4.
7 Cable connector
There are two types of cable connectors, cable plugs and cable sockets. The cable plug shall mate with
either a header connector or a cable socket. Mechanical coding of cable plug and cable socket are defined
in 7.1.2 and 7.2.2.
7.1 Cable plug
7.1.1 Dimension criteria
Two types of cable plug are defined.
Type A cable plug is defined in Figure 7 and type B cable plug is defined in Figure 8. MRP is used to
determine a mechanical position when a cable plug and cable socket are mated. Additionally, ORP is
used to determine an optical position for the efficient optical coupling performance.
— Type A
A type A cable plug shall comply with the dimensions and tolerances defined in Figure 7.
Dimensions in millimetres
Figure 7 — Cable plug (type A)
— Type B
A type B cable plug shall comply with the dimensions and tolerances defined in Figure 8.
Dimensions in millimetres
Figure 8 — Cable plug (type B)
12 © ISO 2020 – All rights reserved

7.1.2 Mechanical coding
Cable plug implements a mechanical coding that prevents possible wrong connection. Type A and type B
cable plug mechanical coding are defined in 6.2.
7.2 Cable socket
7.2.1 Dimension criteria
Two types of cable socket are defined.
Type A cable socket is defined in Figure 9 and type B cable socket is defined in Figure 10. MRP is used
to determine a mechanical position when a cable plug and cable socket are mated. Additionally, ORP is
used to determine an optical position for the efficient optical coupling performance.
— Type A
A type A cable socket connector shall comply with the dimensions and tolerances defined in
Figure 9.
Dimensions in millimetres
Figure 9 — Cable socket (type A)
...