ISO 21806-9:2020

Road vehicles — Media Oriented Systems Transport (MOST) — Part 9: 150-Mbit/s optical physical layer conformance test plan

This document specifies the conformance test plan for the 150-Mbit/s optical physical layer for MOST (MOST150 oPHY), a synchronous time-division-multiplexing network. This document specifies the basic conformance test measurement methods, relevant for verifying compatibility of networks, nodes, and MOST components with the requirements specified in ISO 21806-8[eXtyles1] . [eXtyles1]ISO 21806-8: current stage is 50.00

Véhicules routiers — Système de transport axé sur les médias — Partie 9: Plan d'essais de conformité de la couche optique physique à 150-Mbit/s

General Information

• Status: Published
• Publication Date: 25-Oct-2020
• ICS: 43.040.15 - Car informatics. On board computer systems
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 3 - In-vehicle networks
• Current Stage: 6060 - International Standard published
• Start Date: 26-Oct-2020
• Due Date: 07-Dec-2020
• Completion Date: 26-Oct-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21806-9
First edition
2020-10
Road vehicles — Media Oriented
Systems Transport (MOST) —
Part 9:
150-Mbit/s optical physical layer
conformance test plan
Véhicules routiers — Système de transport axé sur les médias —
Partie 9: Plan d'essais de conformité de la couche optique physique à
150-Mbit/s
Reference number
ISO 21806-9:2020(E)
©
ISO 2020

---------------------- Page: 1 ----------------------
ISO 21806-9:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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 © ISO 2020 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 21806-9:2020(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
4.1 Symbols . 2
4.2 Abbreviated terms . 2
5 Conventions . 3
6 Operating conditions and measurement tools, requested accuracy .3
6.1 Operating conditions . 3
6.2 Apparatus — Measurement tools, requested accuracy . 3
7 Electrical characteristics . 5
7.1 Test according to LVDS . 5
7.2 Test according to LVTTL . 5
8 Optical characteristics . 5
8.1 Measurement of optical output power at SP2. 5
8.2 Measurement of optical input power at SP3 . 6
8.3 Measurement of pigtail fibre attenuation . 7
8.3.1 General. 7
8.3.2 Practical considerations . 9
8.4 Spectral parameters at SP2 .11
8.5 b /b detection at SP2 .11
0 1
8.6 Extinction ratio at SP2 .13
8.7 Optical overshoot and undershoot at SP2 .13
8.7.1 General.13
8.7.2 Overshoot measurement example .14
8.7.3 Undershoot (2 UI) measurement example .16
8.7.4 Undershoot (4UI) measurement example .16
8.8 Transition times at SP2 .17
8.9 Stimulus creation for SP3 .18
9 Measurement of phase variation .19
9.1 General .19
9.2 Measuring alignment jitter .21
9.3 Measuring transferred jitter .23
9.4 Test set-ups .25
9.4.1 Relevant eye mask for MOST components .25
9.4.2 SP4 Jitter measurement (AJ and TJ) .26
9.4.3 SP2 jitter measurement (AJ and TJ) .27
9.5 Crosstalk .28
9.5.1 General.28
9.5.2 Measurement set-up .28
9.5.3 Procedure .29
10 Power-on and power-off .29
10.1 General .29
10.2 Measuring EOC parameters .30
10.2.1 Measuring EOC parameters — Test set-up .30
10.2.2 Measuring EOC parameters — Signal charts.31
10.2.3 Measuring EOC parameters — Test sequences .33
10.3 Measuring OEC parameters .37
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ISO 21806-9:2020(E)

10.3.1 Measuring OEC parameters — Test set-up .37
10.3.2 Measuring OEC parameters — Signal charts.38
10.3.3 Measuring OEC parameters — Test sequences .39
11 Detecting bit rate (frequency reference) .43
12 System performance .43
12.1 General .43
12.2 SP4 receiver tolerance .43
12.3 TimingMaster delay tolerance .44
13 Conformance tests of 150-Mbit/s optical physical layer .47
13.1 Location of interfaces .47
13.2 Control signals .48
13.3 Limited access to specification points .49
13.4 Parameter overview .49
14 Physical layer verification for MOST components, MOST modules, and MOST devices .51
14.1 FOT .51
14.2 Pigtail.52
14.3 MOST device .52
14.4 Development tool .52
15 Full physical layer conformance .52
15.1 Overview .52
15.2 Consideration of FOT .52
15.3 Consideration of pigtail .52
15.4 Consideration of connector interfaces .52
15.5 Generating test signals for the IUT .53
15.5.1 General information .53
15.5.2 Test set-up for jitter measurement .53
16 Limited physical layer conformance .53
16.1 Overview .53
16.2 Generating test signals for the IUT input section SP3 .55
16.3 Analysis of test results .56
16.4 Test flow overview .56
16.5 Measurement of SP3 input signal of the IUT .57
16.6 Measurement of SP2 output signal of the IUT .58
16.7 Functional testing of wake-up and shutdown .58
17 Direct physical measuring accuracy.59
18 General remarks .61
18.1 Definition of family .61
18.2 Supplier guideline for product changes .61
18.3 Dependency of the network frame rate .62
Annex A (informative) Measuring optical signals at SP2 using averaging .63
Annex B (normative) SNR requirements for test equipment .64
Annex C (informative) Limited physical layer conformance for development tools .67
Bibliography .68
iv © ISO 2020 – All rights reserved

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ISO 21806-9:2020(E)

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 31,
Data communication.
A list of all parts in the ISO 21806 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.
© ISO 2020 – All rights reserved v

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ISO 21806-9:2020(E)

Introduction
The Media Oriented Systems Transport (MOST) communication technology was initially developed at
the end of the 1990s in order to support complex audio applications in cars. The MOST Cooperation was
founded in 1998 with the goal to develop and enable the technology for the automotive industry. Today,
1)
MOST enables the transport of high quality of service (QoS) audio and video together with packet data
and real-time control to support modern automotive multimedia and similar applications. MOST is a
function-oriented communication technology to network a variety of multimedia devices comprising
one or more MOST nodes.
Figure 1 shows a MOST network example.
Figure 1 — MOST network example
The MOST communication technology provides
— synchronous and isochronous streaming,
— small overhead for administrative communication control,
— a functional and hierarchical system model,
— API standardization through a function block (FBlock) framework,
— free partitioning of functionality to real devices,
— service discovery and notification, and
[3]
— flexibly scalable automotive-ready Ethernet communication according to ISO/IEC/IEEE 8802-3 .
MOST is a synchronous time-division-multiplexing (TDM) network that transports different data types
on separate channels at low latency. MOST supports different bit rates and physical layers. The network
clock is provided with a continuous data signal.
1) MOST® is the registered trademark of Microchip Technology Inc. This information is given for the convenience
of users of this document and does not constitute an endorsement by ISO.
vi © ISO 2020 – All rights reserved

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ISO 21806-9:2020(E)

Within the synchronous base data signal, the content of multiple streaming connections and control
data is transported. For streaming data connections, bandwidth is reserved to avoid interruptions,
collisions, or delays in the transport of the data stream.
MOST specifies mechanisms for sending anisochronous, packet-based data in addition to control data
and streaming data. The transmission of packet-based data is separated from the transmission of
control data and streaming data. None of them interfere with each other.
A MOST network consists of devices that are connected to one common control channel and packet
channel.
In summary, MOST is a network that has mechanisms to transport the various signals and data streams
that occur in multimedia and infotainment systems.
The ISO standards maintenance portal (https:// standards .iso .org/ iso/ ) provides references to MOST
specifications implemented in today's road vehicles because easy access via hyperlinks to these
specifications is necessary. It references documents that are normative or informative for the MOST
versions 4V0, 3V1, 3V0, and 2V5.
The ISO 21806 series has been established in order to specify requirements and recommendations
for implementing the MOST communication technology into multimedia devices and to provide
conformance test plans for implementing related test tools and test procedures.
To achieve this, the ISO 21806 series is based on the open systems interconnection (OSI) basic reference
[1] [2]
model in accordance with ISO/IEC 7498-1 and ISO/IEC 10731 , which structures communication
systems into seven layers as shown in Figure 2. Stream transmission applications use a direct stream
data interface (transparent) to the data link layer.
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ISO 21806-9:2020(E)

Figure 2 — The ISO 21806 series reference according to the OSI model
The International Organization for Standardization (ISO) draws attention to the fact that it is claimed
that compliance with this document may involve the use of a patent.
ISO takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured ISO that he/she is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In
this respect, the statement of the holder of this patent right is registered with ISO. Information may be
obtained from the patent database available at www .iso .org/ patents.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights other than those in the patent database. ISO shall not be held responsible for identifying
any or all such patent rights.
viii © ISO 2020 – All rights reserved

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INTERNATIONAL STANDARD ISO 21806-9:2020(E)
Road vehicles — Media Oriented Systems Transport
(MOST) —
Part 9:
150-Mbit/s optical physical layer conformance test plan
1 Scope
This document specifies the conformance test plan for the 150-Mbit/s optical physical layer for MOST
(MOST150 oPHY), a synchronous time-division-multiplexing network.
This document specifies the basic conformance test measurement methods, relevant for verifying
compatibility of networks, nodes, and MOST components with the requirements specified in
ISO 21806-8.
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 21806-1, Road vehicles — Media Oriented Systems Transport (MOST) — Part 1: General information
and definitions
ISO 21806-8:2020, Road vehicles — Media Oriented Systems Transport (MOST) — Part 8: 150-Mbit/s
optical physical layer
IEC 60793-1-40, Optical fibres — Part 1-40: Measurement methods and test procedures — Attenuation
IEC 61280-1-3, Fibre optic communication subsystem test procedures — Part 1-3: General communication
subsystems — Central wavelength and spectral width measurement, Method B
IEC 61280-2-2, Fibre optic communication subsystem test procedures — Part 2-2: Digital systems — Optical
eye pattern, waveform and extinction ratio measurement
IEC 61300-3-4, Fibre optic interconnecting devices and passive components — Basic test and measurement
procedures — Part 3-4: Examinations and measurements — Attenuation
2)
JEDEC No. JESD8C.01 , Interface Standard for Nominal 3 V/3.3 V Supply Digital Integrated Circuits
3)
TIA/EIA-644-A , Electrical Characteristics of Low-Voltage Differential Signaling (LVDS) Interface Circuits
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21806-1, ISO 21806-8, 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
2) Available at https:// www .jedec .org/ .
3) Available at https:// www .tiaonline .org/ standards/ .
© ISO 2020 – All rights reserved 1

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ISO 21806-9:2020(E)

— IEC Electropedia: available at http:// www .electropedia .org/
3.1
intersymbol interference
disturbance due to the overflowing into the signal element representing a wanted digit of signal
elements representing preceding or following digits
[SOURCE: IEC Electropedia 702-08-33]
4 Symbols and abbreviated terms
4.1 Symbols
--- empty cell/undefined
t time of optical signal level detection end
OSLE
t time of optical signal level detection start
OSLS
ρ frame rate
Fs
ρ bit rate
BR
4.2 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 21806-1, ISO 21806-8, and the
following apply.
AC alternate current
AJ alignment jitter
AWG arbitrary waveform generator
BW bandwidth
DC direct current
DCD duty cycle distortion
DSO digital sampling oscilloscope
IUT implementation under test
EMD equilibrium mode power distribution
EOC electrical optical converter
FOT fibre optic transceiver
MNC MOST network controller
NA numerical aperture
OEC optical electrical converter
PG pattern generator
PHYSTT physical layer stress test tool
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ISO 21806-9:2020(E)

PLL phase lock loop
POF plastic optical fibre
RMS root mean square
SDA serial data analyser
SMD surface mount device
SNR signal-to-noise ratio
SP Specification Point
THM through hole mount
TJ transferred jitter
UI unit interval
VCM common mode voltage
5 Conventions
[2]
This document is based on OSI service conventions as specified in ISO/IEC 10731 .
6 Operating conditions and measurement tools, requested accuracy
6.1 Operating conditions
Temperature range for MOST components: T = −40 °C to +95 °C according to ISO 21806-8:2020, 11.4.
A
Voltage range for MOST components: V = 3,135 V to 3,465 V according to ISO 21806-8:2020, Clause 10.
CC
NOTE There are functional requirements for the EOC within an extended voltage supply range according to
ISO 21806-8.
6.2 Apparatus — Measurement tools, requested accuracy
The following list provides state-of-the-art tools.
6.2.1 Oscilloscope
— digital samplin
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 21806-9
ISO/TC 22/SC 31 Secretariat: DIN
Voting begins on: Voting terminates on:
2019-10-10 2020-01-02
Road vehicles — Media oriented systems transport (MOST)
framework —
Part 9:
150 Mbit/s optical physical layer conformance test plan
Véhicules routiers — Environnement du système axé sur les médias —
Partie 9: Essai de conformité de la couche optique physique de 150 Mbit/s
ICS: 43.040.15
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 21806-9:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019

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ISO/DIS 21806-9:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DIS 21806-9:2019(E)
Contents Page
Foreword . vi
Introduction . vi
1 Scope .1
2 Normative references .2
3 Terms and definitions .3
4 Abbreviated terms .4
5 Conformance .5
6 Operating conditions and measurement tools, requested accuracy .6
6.1 Operating conditions . 6
6.2 Measurement tools, requested accuracy . 6
7 Electrical characteristics.8
7.1 Test according to LVDS . 8
7.2 Test according to LVTTL . 8
8 Optical characteristics .8
8.1 Measurement of optical output power at SP2 . 8
8.2 Measurement of optical input power at SP3 . 9
8.3 Measurement of pigtail fibre attenuation . 10
8.4 Spectral parameters at SP2 . 13
8.5 b /b detection at SP2 . 14
0 1
8.6 Extinction ratio at SP2 . 15
8.7 Optical overshoot and undershoot at SP2 . 16
8.7.1 General . 16
8.7.2 Overshoot measurement example . 16
8.7.3 Undershoot (2 UI) measurement example . 18
8.7.4 Undershoot (4UI) measurement example . 18
8.8 Transition times at SP2 . 19
8.9 Creating a Stimulus for SP3 . 20
9 Measurement of phase variation . 22
9.1 General . 22
9.2 Measuring alignment jitter . 23
9.3 Measuring transferred jitter . 26
9.4 Test set-ups . 28
9.4.1 Relevant eye mask for MOST components . 28
9.4.2 SP4 Jitter Measurement (AJ and TJ) . 28
9.4.3 SP2 jitter measurement (AJ and TJ) . 31
9.5 Crosstalk . 31
9.5.1 General . 31
9.5.2 Measurement set-up . 31
9.5.3 Procedure . 32
10 Power-on/power-off . 33
10.1 Basics . 33
10.2 Measuring EOC parameters . 33
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ISO/DIS 21806-9:2019(E)
10.2.1 Measuring EOC parameters – Test set-up . 33
10.2.2 Measuring EOC parameters – Signal charts . 35
10.2.3 Measuring EOC parameters – Test sequences . 36
10.3 Measuring OEC parameters . 43
10.3.1 Measuring OEC parameters – Test set-up . 43
10.3.2 Measuring OEC parameters – Signal charts . 44
10.3.3 Measuring OEC parameters – Test sequences . 44
11 Detecting bit rate (frequency reference). 51
12 System performance . 51
12.1 General . 51
12.2 SP4 receiver tolerance . 51
12.3 TimingMaster delay tolerance . 52
13 Conformance tests of 150-Mbit/s optical physical layer . 55
13.1 Location of interfaces . 55
13.2 Control signals. 56
13.3 Limited access to specification points . 56
13.3.1 General . 56
13.3.2 Example for “covered functionality” . 57
13.4 Parameter overview . 57
14 Physical layer verification for MOST components, MOST modules, and MOST devices . 59
14.1 FOT . 59
14.2 Pigtail . 59
14.3 MOST device . 60
14.4 Development tool . 60
15 Full physical layer conformance . 60
15.1 Overview . 60
15.2 Consideration of FOT. 60
15.3 Consideration of pigtail . 60
15.4 Consideration of connector interfaces . 61
15.5 Generating test signals for the IUT . 61
15.5.1 General information . 61
15.5.2 Test set-up for jitter measurement . 61
16 Limited physical conformance . 61
16.1 Overview . 61
16.2 Generating test signals for the IUT input section SP3 . 64
16.3 Analysis of test results . 64
16.4 Test flow overview . 65
16.5 Measurement of SP3 input signal of the IUT . 65
16.6 Measurement of SP2 output signal of the IUT . 66
16.7 Functional testing of wake-up and shutdown. 67
17 Direct physical measuring accuracy . 67
18 General remarks . 69
18.1 Definition of family . 69
18.2 Product changes . 69
18.3 Consideration of the network frame rate . 70
Annex A (informative) Measuring optical signals at SP2 using averaging . 72
Annex B (normative) SNR requirements for test equipment . 73
B.1 Introduction . 73
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ISO/DIS 21806-9:2019(E)
B.1.1 Relevance of conformance . 73
B.1.2 OEC impacts to the measurement . 73
B.2 Measurement of SNR . 73
B.2.1 Set-up . 73
B.2.2 Measurement . 74
B.2.3 SNR calculation . 74
B.3 SNR minimum requirements . 75
B.3.1 General . 75
B.3.2 SNR requirement table . 75
Annex C (normative) Limited physical layer conformance for development tools . 76
Bibliography . 77
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v

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ISO/DIS 21806-9:2019(E)
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 31,
Data communication.
A list of all parts in the ISO 21806 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.
© ISO 2019 – All rights reserved
vi

---------------------- Page: 6 ----------------------
ISO/DIS 21806-9:2019(E)
Introduction
The Media Oriented Systems Transport (MOST) communication technology was initially developed at
the end of the 1990s in order to support complex audio applications in cars. The MOST Cooperation was
founded in 1998 with the goal to develop and enable the technology for the automotive industry. Today,
MOST enables the transport of high Quality of Service (QoS) audio and video together with packet data
and real-time control to support modern automotive multimedia and similar applications. MOST is a
function-oriented communication technology to network a variety of multimedia devices comprising
one or more MOST nodes.
Figure 1 shows a MOST network example.
Figure 1 — MOST network example
The MOST communication technology provides
⎯ synchronous and isochronous streaming,
⎯ small overhead for administrative communication control,
⎯ a functional and hierarchical system model,
⎯ API standardization through a function block (FBlock) framework,
⎯ free partitioning of functionality to real devices,
⎯ service discovery and notification, and
© ISO 2019 – All rights reserved
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ISO/DIS 21806-9:2019(E)
⎯ flexibly scalable automotive-ready Ethernet communication according to ISO/IEC/IEEE 8802-3.
MOST is a synchronous time-division-multiplexing (TDM) network that transports different data types
on separate channels at low latency. MOST supports different bit rates and physical layers. The network
clock is provided with a continuous data signal.
Within the synchronous base data signal, the content of multiple streaming connections and control
data is transported. For streaming data connections, bandwidth is reserved to avoid interruptions,
collisions, or delays in the transport of the data stream.
MOST specifies mechanisms for sending anisochronous, packet-based data in addition to control data
and streaming data. The transmission of packet-based data is separated from the transmission of
control data and streaming data. None of them interfere with each other.
A MOST network consists of devices that are connected to one common control channel and packet
channel.
In summary, MOST is a network that has mechanisms to transport the various signals and data streams
that occur in multimedia and infotainment systems.
The ISO Standards Maintenance Portal (http://standards.iso.org/iso/) provides references to MOST
specifications implemented in today's road vehicles because easy access via hyperlinks to these
specifications is necessary. It references documents that are normative or informative for the MOST
versions 4V0, 3V1, 3V0, and 2V5.
MOST® is the Registered Trademark of Microchip Technology Inc. This information is given for the
convenience of users of this document and does not constitute an endorsement by ISO.
The ISO 21806 series has been established in order to specify requirements and recommendations for
implementing the MOST communication technology into multimedia devices and to provide
conformance test plans for implementing related test tools and test procedures.
To achieve this, the ISO 21806 series is based on the Open Systems Interconnection (OSI) Basic
Reference Model in accordance with ISO/IEC 7498-1 [1] and ISO/IEC 10731 [2], which structures
communication systems into seven layers as shown in Figure 2.
© ISO 2019 – All rights reserved
viii

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ISO/DIS 21806-9:2019(E)

Key
1 Stream transmission application uses a direct stream data interface (transparent) to the data link layer
Figure 2 — ISO 21806 documents reference according to the OSI model

© ISO 2019 – All rights reserved
ix

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DRAFT INTERNATIONAL STANDARD ISO/DIS 21806-9:2019(E)
Road vehicles — Media oriented systems transport (MOST)
framework —
Part 9:
150 Mbit/s optical physical layer conformance test plan
1 Scope
This document specifies the conformance test plan, which covers the MOST150 optical physical layer
conformance tests.
All MOST networks operate as synchronous rings regardless of physical layer media or bit rate.
Therefore, all MOST networks require the same basic types of timing measurements. These actual
timing requirements are specific for the combination of physical layer and bit rate.
This document specifies the basic conformance test measurement methods, relevant for verifying
compatibility of networks, nodes, and MOST components with the requirements specified in
ISO 21806-8.
This document shows basic measurement principles and set-ups for all specified parameters in
ISO 21806-8. There are potentially other options for determining parameters, which are more suitable
for characterization and end-of-line testing in the supply chain. Selection and definition of an
appropriate test strategy are in the responsibility of the supplier. All used measurement procedures
provide measurement traceability to the basic principles shown in this document.
For the majority of parameters, ISO 21806-8 is defined as an interface specification. Parameters and the
requested performance ranges are stated for MOST components sending into the interface. The same
performance ranges shall be considered as input tolerances for MOST components being connected to
the interface as receiver. For verification of output performance of a MOST component that sends into
an interface, the input variations shall be considered – if they exist.
The process of conformance test verification describes how to achieve conformance certification for
ISO 21806-8 MOST devices and MOST components.
For documentation clarity, some values of ISO 21806-8 are used within this document.
IMPORTANT — Clauses 6 to 12 and Annex A in this document specify general conformance
measurement guidelines. Clauses 13 to 18 specify the conformance test plan of ISO 21806-8.
© ISO 2019 – All rights reserved
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ISO/DIS 21806-9:2019(E)
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 21806-1, Road vehicles — Media Oriented Systems Transport (MOST) — Part 1: General
information and definitions
ISO 21806-8, Road vehicles —Media Oriented Systems Transport (MOST) — Part 8: 150-Mbit/s optical
physical layer
MOST, FBlock EnhancedTestability
[SOURCE: http://standards.iso.org/iso/21806/]
MOST, FBlock ExtendedNetworkControl
[SOURCE: http://standards.iso.org/iso/21806/]
MOST150 stress pattern
[SOURCE: http://standards.iso.org/iso/21806/]
IEC 61280-1-3 Ed. 2.0, Fibre optic communication subsystem test procedures — Part 1-3: General
communication subsystems — Central wavelength and spectral width measurement Ed. 2 (2010),
Method B
[SOURCE: https://webstore.iec.ch/home]
AEC-Q100: Failure Mechanism Based Stress Test Qualification For Integrated Circuits
[SOURCE: http://www.aecouncil.com/AECDocuments.html]
IEC 60825-1, Safety of laser products — Part 1: Equipment classification and requirements
[SOURCE: https://webstore.iec.ch/home]
IEC 60825-2, Safety of laser products — Part 2: Safety of Optical Fibre Communication Systems (OFCS)
[SOURCE: https://webstore.iec.ch/home]
IEC 61280-2-2:2008, Fibre optic communication subsystem test procedures — Part 2-2: Digital systems
— Optical eye pattern, waveform and extinction ratio measurement
[SOURCE: https://webstore.iec.ch/home]
IEC 61300-3-4, Fibre optic interconnecting devices and passive components — Basic test and
measurement procedures — Part 3-4: Examinations and measurements – Attenuation
[SOURCE: https://webstore.iec.ch/home]
IEC 60793-1-40, Optical fibres — Part 1-40: Measurement methods and test procedures — Attenuation
[SOURCE: https://webstore.iec.ch/home]
JEDEC No. JESD8C.01, Interface Standard for Nominal 3 V/3.3 V Supply Digital Integrated Circuits
[SOURCE: http://www.jedec.org/]
TIA/EIA-644-A-2001, Electrical Characteristics of Low-Voltage Differential Signaling (LVDS) Interface
Circuits [SOURCE: http://www.tiaonline.org/standards/]
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ISO/DIS 21806-9:2019(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21806-1, ISO 21806-8, and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
⎯ IEC Electropedia: available at http://www.electropedia.org/
⎯ ISO Online browsing platform: available at http://www.iso.org/obp
3.1
intersymbol interference
disturbance due to the overflowing into the signal element representing a wanted digit of signal
elements representing preceding or following digits
Source: IEC Electropedia [702-08-33]
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ISO/DIS 21806-9:2019(E)
4 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 21806-1, ISO 21806-8, and the
following apply.
AC  alternate current
AJ  alignment jitter
AWG arbitrary waveform generator
BR  bit rate
BW  bandwidth
DC  direct current
IUT  implementation under test
EMD equilibrium mode power distribution
EOC  electrical optical converter
FOT  fibre optic transceiver
MNC MOST network controller
NA  numerical aperture
OEC  optical electrical converter
PG  pattern generator
PHYSTT physical layer stress test tool
PLL  phase lock loop
POF  plastic optical fibre
RMS root mean square
SDA  serial data analyser
SMD surface mount device
SNR  signal-to-noise ratio
SP  specification point
THM through hole mount
TJ  transferred jitter
UI  unit interval
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ISO/DIS 21806-9:2019(E)
VCM common mode voltage
5 Conform
...