Road vehicles -- Media Oriented Systems Transport (MOST)

This document specifies the conformance test plan for the 150-Mbit/s coaxial physical layer for MOST (MOST150 cPHY), 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 21806‑10.

Véhicules routiers -- Système de transport axé sur les médias

General Information

Status
Published
Publication Date
30-May-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
20-Apr-2021
Completion Date
20-Apr-2021
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INTERNATIONAL ISO
STANDARD 21806-11
First edition
2021-05
Road vehicles — Media Oriented
Systems Transport (MOST) —
Part 11:
150-Mbit/s coaxial physical layer
conformance test plan
Véhicules routiers — Système de transport axé sur les médias —
Partie 11: Plan d'essais de conformité de la couche coaxiale physique
à 150 Mbit/s
Reference number
ISO 21806-11:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 21806-11:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21806-11:2021(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 ..............................................................4

6.1 Operating conditions ......................................................................................................................................................................... 4

6.2 Apparatus — Measurement tools, requested accuracy ....................................................................................... 4

7 Electrical characteristics .............................................................................................................................................................................. 4

7.1 Test according to LVDS ..................................................................................................................................................................... 4

7.2 Test according to LVTTL .................................................................................................................................................................. 5

8 Coaxial characteristics ................................................................................................................................................................................... 5

8.1 High/low detection at SP2 ............................................................................................................................................................ 5

8.2 Transition times at SP2 .................................................................................................................................................................... 5

8.3 Steady state amplitude at SP2 .................................................................................................................................................... 6

8.4 Attenuation of coaxial interconnect ...................................................................................................................................... 7

8.4.1 General...................................................................................................................................................................................... 7

8.4.2 Coefficient values based on attenuation measurements ............................................................... 7

8.4.3 Fitting of corridor ........................................................................................................................................................... 7

8.4.4 Attenuation test set-up ............................................................................................................................................... 7

8.4.5 Test procedure ................................................................................................................................................................... 8

8.5 RL of connectors and couplers ...............................................................................................................................................13

8.6 Characteristic impedance of coaxial cable ...................................................................................................................13

8.7 RL of coaxial interconnect ..........................................................................................................................................................13

8.8 RL of PCB interfaces ........................................................................................................................................................................15

8.9 Stimulus creation for SP3 ...........................................................................................................................................................16

8.9.1 General...................................................................................................................................................................................16

8.9.2 Pattern generator .........................................................................................................................................................16

8.9.3 Arbitrary signal generator ....................................................................................................................................17

8.9.4 Attenuator .................. .................................................... .....................................................................................................17

8.9.5 Cable or analogue representation ..................................................................................................................17

8.9.6 Noise generator ...................................................................... ........................................................................................18

8.9.7 Creating a stimulus for SP3 for simplex applications ...................................................................18

8.9.8 Creating a stimulus for SP3 for duplex applications ......................................................................20

9 Measurement of phase variation ......................................................................................................................................................23

9.1 General ........................................................................................................................................................................................................23

9.2 Measuring alignment jitter ........................................................................................................................................................25

9.3 Measuring transferred jitter .....................................................................................................................................................27

10 Test set-ups..............................................................................................................................................................................................................30

10.1 General ........................................................................................................................................................................................................30

10.2 Graphical symbols and descriptions .................................................................................................................................30

10.2.1 Pattern generator SP1 ..............................................................................................................................................30

10.2.2 SP3 stimulus .....................................................................................................................................................................30

10.2.3 Standalone simplex ECport under test ......................................................................................................31

10.2.4 Integrated simplex ECport under test ........................................................................................................31

10.2.5 Standalone simplex CEport under test ......................................................................................................32

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 21806-11:2021(E)

10.2.6 Integrated simplex CEport under test ........................................................................................................32

10.2.7 Duplex ECport under test ......................................................................................................................................33

10.2.8 Duplex CEport under test ......................................................................................................................................34

10.3 Set-ups for dual simplex ..............................................................................................................................................................34

10.3.1 General...................................................................................................................................................................................34

10.3.2 SP2 signal quality measurement for simplex .......................................................................................34

10.3.3 SP4 jitter measurement (AJ and TJ) for simplex................................................................................36

10.4 Set-ups for duplex .............................................................................................................................................................................37

10.4.1 General...................................................................................................................................................................................37

10.4.2 Directional couplers ...................................................................................................................................................37

10.4.3 SP2 signal quality measurement for duplex .........................................................................................40

10.4.4 SP4 jitter measurement (AJ and TJ) for duplex ..................................................................................42

11 Power-on and power-off ............................................................................................................................................................................44

11.1 General ........................................................................................................................................................................................................44

11.2 Measuring ECC parameters .......................................................................................................................................................45

11.2.1 Measuring ECC parameters – Test set-up ................................................................................................45

11.2.2 Measuring ECC parameters – Signal charts ...........................................................................................46

11.2.3 Measuring ECC parameters – Test sequences .....................................................................................47

11.3 Measuring CEC parameters .......................................................................................................................................................51

11.3.1 Measuring CEC parameters – Test set-up ................................................................................................51

11.3.2 Measuring CEC parameters – Signal charts ...........................................................................................53

11.3.3 Measuring CEC parameters – Test sequences .....................................................................................53

12 Detecting bit rate (frequency reference) .................................................................................................................................57

13 System performance ......................................................................................................................................................................................57

13.1 General ........................................................................................................................................................................................................57

13.2 SP4 receiver tolerance ...................................................................................................................................................................57

13.3 TimingMaster delay tolerance ................................................................................................................................................58

14 Conformance tests of 150-Mbit/s coaxial physical layer .........................................................................................61

14.1 Location of interfaces .....................................................................................................................................................................61

14.2 Control signals ......................................................................................................................................................................................64

14.3 Limited access to specification points .............................................................................................................................65

14.4 Parameter overview ........................................................................................................................................................................66

15 Limited physical layer conformance .............................................................................................................................................66

15.1 Overview ...................................................................................................................................................................................................66

15.2 Test set-ups 1 and 2 .........................................................................................................................................................................67

15.3 Generating test signals for the IUT input section SP3 ........................................................................................68

15.4 Analysis of test results ...................................................................................................................................................................69

15.5 Test flow overview ............................................................................................................................................................................69

15.6 Measurement of SP3 input signal of the IUT ..............................................................................................................70

15.7 Measurement of SP2 output signal of the IUT ..........................................................................................................71

15.8 Measurement of RL ..........................................................................................................................................................................72

15.9 Functional test of wake-up and shutdown ...................................................................................................................72

16 Direct physical measuring accuracy..............................................................................................................................................72

17 Measurement of Port1 delay drift ...................................................................................................................................................73

Annex A (informative) Limited physical layer conformance for development tools .......................................74

Annex B (normative) SP3 stress conditions ...............................................................................................................................................75

Annex C (normative) Compensation set-up for MOST150 cPHY duplex ......................................................................76

Annex D (informative) Test procedure for 2-port nodes ..............................................................................................................80

Bibliography .............................................................................................................................................................................................................................84

iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21806-11:2021(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 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 21806-11:2021(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
[2]

— 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.

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 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 21806-11:2021(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 an isochronous, 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] [3]

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.
© ISO 2021 – All rights reserved vii
---------------------- Page: 7 ----------------------
ISO 21806-11:2021(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 2021 – All rights reserved
---------------------- Page: 8 ----------------------
INTERNATIONAL STANDARD ISO 21806-11:2021(E)
Road vehicles — Media Oriented Systems Transport
(MOST) —
Part 11:
150-Mbit/s coaxial physical layer conformance test plan
1 Scope

This document specifies the conformance test plan for the 150-Mbit/s coaxial physical layer for MOST

(MOST150 cPHY), 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 21806-10.
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 21806-10, Road vehicles — Media Oriented Systems Transport (MOST) — Part 10: 150-Mbit/s coaxial

physical layer

ISO 20860-2, Road vehicles — 50 ohms impedance radio frequency connection system interface — Part 2:

Test procedures

EN 50289-1-8, Communication cables — Specifications for test methods — Part 1-8: Electrical test

methods — Attenuation

EN 50289-1-11, Communication cables — Specifications for test methods — Part 1-11: Electrical test

methods — Characteristic impedance, input impedance, return loss

No JEDEC JESD8C.01, interface Standard for Nominal 3 V/3.3 V Supply Digital Integrated Circuits

TIA/EIA-644-A-2001, 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 21806-10 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 2021 – All rights reserved 1
---------------------- Page: 9 ----------------------
ISO 21806-11:2021(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 table cell or feature undefined
A DC attenuation
DC_loss
F frequency
ρ network frame rate
ρ bit rate
ν transferred jitter, calculated using the root-mean-square method
RMS
L return loss
V voltage at the LVDS receive terminal P
RXP
V voltage at the LVDS receive terminal N
RXN
V voltage at the LVDS transmit terminal P
TXP
V voltage at the LVDS transmit terminal N
TXN
t time
T temperature
T ambient temperature
T typical temperature
Typ
t start of measurement time
SLS
t end of measurement time
SLE
4.2 Abbreviated terms
AC alternate current
AFE analogue frontend
AJ alignment jitter
BR bit rate
BW bandwidth
2 © ISO 2021 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 21806-11:2021(E)
CEC coaxial electrical converter
CEport coaxial electrical port (combination of AFE and CEC)
Cfg configuration
CTR coaxial transceiver
DC direct current
DSO digital sampling oscilloscope
EMD equilibrium mode power distribution
ECC electrical coaxial converter
ECport electrical coaxial port (co
...

INTERNATIONAL ISO
STANDARD 21806-11
First edition
Road vehicles — Media Oriented
Systems Transport (MOST) —
Part 11:
150-Mbit/s coaxial physical layer
conformance test plan
Véhicules routiers — Système de transport axé sur les médias —
Partie 11: Plan d'essais de conformité de la couche coaxiale physique
à 150 Mbit/s
PROOF/ÉPREUVE
Reference number
ISO 21806-11:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 21806-11:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21806-11:2021(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 ....................................................................................... 4

7 Electrical characteristics .............................................................................................................................................................................. 4

7.1 Test according to LVDS ..................................................................................................................................................................... 4

7.2 Test according to LVTTL .................................................................................................................................................................. 4

8 Coaxial characteristics ................................................................................................................................................................................... 5

8.1 High/low detection at SP2 ............................................................................................................................................................ 5

8.2 Transition times at SP2 .................................................................................................................................................................... 5

8.3 Steady state amplitude at SP2 .................................................................................................................................................... 6

8.4 Attenuation of coaxial interconnect ...................................................................................................................................... 6

8.4.1 General...................................................................................................................................................................................... 6

8.4.2 Coefficient values based on attenuation measurements ............................................................... 7

8.4.3 Fitting of corridor ........................................................................................................................................................... 7

8.4.4 Attenuation test set-up ............................................................................................................................................... 7

8.4.5 Test procedure ................................................................................................................................................................... 8

8.5 RL of connectors and couplers ...............................................................................................................................................13

8.6 Characteristic impedance of coaxial cable ...................................................................................................................13

8.7 RL of coaxial interconnect ..........................................................................................................................................................13

8.8 RL of PCB interfaces ........................................................................................................................................................................15

8.9 Stimulus creation for SP3 ...........................................................................................................................................................16

8.9.1 General...................................................................................................................................................................................16

8.9.2 Pattern generator .........................................................................................................................................................16

8.9.3 Arbitrary signal generator ....................................................................................................................................17

8.9.4 Attenuator .................. .................................................... .....................................................................................................17

8.9.5 Cable or analogue representation ..................................................................................................................17

8.9.6 Noise generator ...................................................................... ........................................................................................18

8.9.7 Creating a stimulus for SP3 for simplex applications ...................................................................18

8.9.8 Creating a stimulus for SP3 for duplex applications ......................................................................20

9 Measurement of phase variation ......................................................................................................................................................23

9.1 General ........................................................................................................................................................................................................23

9.2 Measuring alignment jitter ........................................................................................................................................................25

9.3 Measuring transferred jitter .....................................................................................................................................................27

10 Test set-ups..............................................................................................................................................................................................................30

10.1 General ........................................................................................................................................................................................................30

10.2 Graphical symbols and descriptions .................................................................................................................................30

10.2.1 Pattern generator SP1 ..............................................................................................................................................30

10.2.2 SP3 stimulus .....................................................................................................................................................................30

10.2.3 Standalone simplex ECport under test ......................................................................................................31

10.2.4 Integrated simplex ECport under test ........................................................................................................31

10.2.5 Standalone simplex CEport under test ......................................................................................................32

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 21806-11:2021(E)

10.2.6 Integrated simplex CEport under test ........................................................................................................32

10.2.7 Duplex ECport under test ......................................................................................................................................33

10.2.8 Duplex CEport under test ......................................................................................................................................34

10.3 Set-ups for dual simplex ..............................................................................................................................................................34

10.3.1 General...................................................................................................................................................................................34

10.3.2 SP2 signal quality measurement for simplex .......................................................................................34

10.3.3 SP4 jitter measurement (AJ and TJ) for simplex................................................................................36

10.4 Set-ups for duplex .............................................................................................................................................................................37

10.4.1 General...................................................................................................................................................................................37

10.4.2 Directional couplers ...................................................................................................................................................37

10.4.3 SP2 signal quality measurement for duplex .........................................................................................40

10.4.4 SP4 jitter measurement (AJ and TJ) for duplex ..................................................................................42

11 Power-on and power-off ............................................................................................................................................................................44

11.1 General ........................................................................................................................................................................................................44

11.2 Measuring ECC parameters .......................................................................................................................................................45

11.2.1 Measuring ECC parameters – Test set-up ................................................................................................45

11.2.2 Measuring ECC parameters – Signal charts ...........................................................................................46

11.2.3 Measuring ECC parameters – Test sequences .....................................................................................47

11.3 Measuring CEC parameters .......................................................................................................................................................51

11.3.1 Measuring CEC parameters – Test set-up ................................................................................................51

11.3.2 Measuring CEC parameters – Signal charts ...........................................................................................53

11.3.3 Measuring CEC parameters – Test sequences .....................................................................................53

12 Detecting bit rate (frequency reference) .................................................................................................................................57

13 System performance ......................................................................................................................................................................................57

13.1 General ........................................................................................................................................................................................................57

13.2 SP4 receiver tolerance ...................................................................................................................................................................57

13.3 TimingMaster delay tolerance ................................................................................................................................................58

14 Conformance tests of 150-Mbit/s coaxial physical layer .........................................................................................61

14.1 Location of interfaces .....................................................................................................................................................................61

14.2 Control signals ......................................................................................................................................................................................64

14.3 Limited access to specification points .............................................................................................................................65

14.4 Parameter overview ........................................................................................................................................................................66

15 Limited physical layer conformance .............................................................................................................................................66

15.1 Overview ...................................................................................................................................................................................................66

15.2 Test set-ups 1 and 2 .........................................................................................................................................................................67

15.3 Generating test signals for the IUT input section SP3 ........................................................................................68

15.4 Analysis of test results ...................................................................................................................................................................69

15.5 Test flow overview ............................................................................................................................................................................69

15.6 Measurement of SP3 input signal of the IUT ..............................................................................................................70

15.7 Measurement of SP2 output signal of the IUT ..........................................................................................................71

15.8 Measurement of RL ..........................................................................................................................................................................72

15.9 Functional test of wake-up and shutdown ...................................................................................................................72

16 Direct physical measuring accuracy..............................................................................................................................................72

17 Measurement of Port1 delay drift ...................................................................................................................................................73

Annex A (informative) Limited physical layer conformance for development tools .......................................74

Annex B (normative) SP3 stress conditions ...............................................................................................................................................75

Annex C (normative) Compensation set-up for MOST150 cPHY duplex ......................................................................76

Annex D (informative) Test procedure for 2-port nodes ..............................................................................................................80

Bibliography .............................................................................................................................................................................................................................84

iv PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21806-11:2021(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 2021 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
ISO 21806-11:2021(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
[2]

— 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.

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.
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ISO 21806-11:2021(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 an isochronous, 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] [3]

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.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE vii
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ISO 21806-11:2021(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.
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INTERNATIONAL STANDARD ISO 21806-11:2021(E)
Road vehicles — Media Oriented Systems Transport
(MOST) —
Part 11:
150-Mbit/s coaxial physical layer conformance test plan
1 Scope

This document specifies the conformance test plan for the 150-Mbit/s coaxial physical layer for MOST

(MOST150 cPHY), 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 21806-10.
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 21806-10, Road vehicles — Media Oriented Systems Transport (MOST) — Part 10: 150-Mbit/s coaxial

physical layer

ISO 20860-2, Road vehicles — 50 ohms impedance radio frequency connection system interface — Part 2:

Test procedures

EN 50289-1-8, Communication cables — Specifications for test methods — Part 1-8: Electrical test

methods — Attenuation

EN 50289-1-11, Communication cables — Specifications for test methods — Part 1-11: Electrical test

methods — Characteristic impedance, input impedance, return loss

No JEDEC JESD8C.01, interface Standard for Nominal 3 V/3.3 V Supply Digital Integrated Circuits

TIA/EIA-644-A-2001, 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 21806-10 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/ .
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ISO 21806-11:2021(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 table cell or feature undefined
A DC attenuation
DC_loss
F frequency
ρ network frame rate
ρ bit rate
ν transferred jitter, calculated using the root-mean-square method
RMS
L return loss
t time
T temperature
T ambient temperature
T typical temperature
Typ
t start of measurement time
SLS
t end of measurement time
SLE
4.2 Abbreviated terms
AC alternate current
AFE analogue frontend
AJ alignment jitter
BR bit rate
BW bandwidth
CEC coaxial electrical converter
CEport coaxial electrical port (combination of AFE and CEC)
Cfg configuration
CTR coaxial transceiver
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ISO 21806-11:2021(E)
DC direct current
DSO digital sampling oscilloscope
EMD equilibrium mode power distribution
ECC electrical coaxial converter
ECport electrical coaxial port (combination of AFE and ECC)
IUT implementation under test
MNC
...

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