Road vehicles -- Media Oriented Systems Transport (MOST)

This document provides general information and definitions for Media Oriented Systems Transport (MOST), a synchronous time-division-multiplexing network. This document describes the access to MOST specifications, which are referenced by the ISO 21806 series.

Véhicules routiers -- Système de transport axé sur les médias

General Information

Status
Published
Publication Date
17-Sep-2020
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
12-Aug-2020
Completion Date
12-Aug-2020
Ref Project

Buy Standard

Standard
ISO 21806-1:2020 - Road vehicles -- Media Oriented Systems Transport (MOST)
English language
23 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 21806-1
First edition
2020-09
Road vehicles — Media Oriented
Systems Transport (MOST) —
Part 1:
General information and definitions
Véhicules routiers — Système de transport axé sur les médias —
Partie 1: Information générale et définitions
Reference number
ISO 21806-1:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 21806-1:2020(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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21806-1:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 9

4.1 Symbols ......................................................................................................................................................................................................... 9

4.2 Abbreviated terms ............................................................................................................................................................................... 9

5 Access to MOST specification versions .......................................................................................................................................10

5.1 General ........................................................................................................................................................................................................10

5.2 ISO standards maintenance portal .....................................................................................................................................11

5.3 MOST versions directory structure ....................................................................................................................................11

Annex A (normative) List of implementation relevant documents ...................................................................................13

Annex B (informative) List of supplemental documents ..............................................................................................................21

Bibliography .............................................................................................................................................................................................................................23

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 21806-1:2020(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.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21806-1:2020(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,

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.

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.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 21806-1:2020(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] [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.
vi © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 21806-1:2020(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.
© ISO 2020 – All rights reserved vii
---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 21806-1:2020(E)
Road vehicles — Media Oriented Systems Transport
(MOST) —
Part 1:
General information and definitions
1 Scope

This document provides general information and definitions for Media Oriented Systems Transport

(MOST), a synchronous time-division-multiplexing network.

This document describes the access to MOST specifications, which are referenced by the ISO 21806 series.

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.

MOST Specification Rev. 2.5.0, 10/2006
MOST Specification Rev. 3.0.0E2, 07/2010
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
accumulated jitter

portion of jitter (3.31) at any point in a MOST network (3.43) that is made up entirely of the transferred

jitter (3.84) from all previous nodes (3.57)
3.2
accumulated phase variation

portion of phase variation (3.61) at any point in a MOST network (3.43) that is made up entirely of the

transferred jitter (3.84) and transferred wander (3.85) from all previous nodes (3.57)

3.3
alignment jitter

jitter (3.31) that affects the reception of data by degrading the receiver eye with horizontal closure

2) See Annex A.
3) See Annex A.
© ISO 2020 – All rights reserved 1
---------------------- Page: 8 ----------------------
ISO 21806-1:2020(E)
3.4
anisochronous
DEPRECATED: asynchronous

qualifying a time-varying phenomenon, a timescale or a signal the consecutive significant instants of

which are separated by time intervals which are not all constrained to have the same rated duration or

to have rated durations equal to integral multiples of a unit duration
[SOURCE: IEC Electropedia, 702-04-15, modified — Note 1 to entry was deleted.]
3.5
average pulse width distortion
APWD
average deviation of the signal pulses from their ideal width
3.6
bit rate
number of binary digits transferred per second

[SOURCE: IEC Electropedia, 704-16-07, modified — The term "binary digit rate" was deleted.]

3.7
bits per frame
BPF
number of bits in a network frame (3.54)
3.8
boundary descriptor

value that determines the amount of bandwidth allocated for streaming data (3.75) and packet data (3.60)

3.9
bypass

mechanism that forwards data from Rx to Tx, performing data recovery and clock recovery

3.10
channel
means of transmission of signals in one direction between two points

[SOURCE: IEC Electropedia, 701-02-01, modified — The term was originally "transmission channel"

and Notes 1 and 2 to entry were deleted.]
3.11
channel frame
frame (3.26) that is transported on a channel (3.10)
3.12
connection label
identifier for a streaming connection (3.74)
3.13
control channel
channel (3.10) that is used to transport control data (3.14)
3.14
control data
small data packets with low latency
3.15
control frame
frame (3.26) that transports control data (3.14)
2 © ISO 2020 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 21806-1:2020(E)
3.16
critical unlock
unlock (3.88) or series of unlocks that exceed a certain time
3.17
data-dependent jitter
DDJ
jitter (3.31) generated by changes in the transmitted data pattern
3.18
duplex

pertaining to a mode of operation in which information can be transmitted in both directions

simultaneously between two points

[SOURCE: IEC Electropedia, 701-03-171, modified — The deprecated term "full duplex" was deleted.]

3.19
electrical wake-up line
external line that initiates a network wake-up event
3.20
electromagnetic compatibility
EMC

ability of equipment or a system to function satisfactorily in its electromagnetic environment without

introducing intolerable electromagnetic disturbances to anything in that environment

[SOURCE: IEC Electropedia, 161-01-07]
3.21
electromagnetic interference
EMI

degradation of the performance of an equipment, transmission channel (3.10) or system caused by an

electromagnetic disturbance

[SOURCE: IEC Electropedia, 161-01-06, modified — Notes 1 and 2 to entry were deleted.]

3.22
electronic control unit
ECU

unit adjustable by other than mechanical means (e.g. sensing unit), containing electronic components

and controlling the output via electronic components
[SOURCE: IEC Electropedia, 442-04-22]
3.23
established MOST specification
documents that comply with MOST version 3V0, or 2V5
3.24
eye diagram

“eye-shaped” oscilloscope pattern obtained from the superposition of the signal waveforms from

successive time intervals each allocated to one digit

Note 1 to entry: The eye diagram is used to indicate the amplitude and time margins available to decode the

digital signal.

[SOURCE: IEC Electropedia, 723-10-75, modified — The term "eye pattern" was deleted and "the" was

removed from the beginning of the definition.]
© ISO 2020 – All rights reserved 3
---------------------- Page: 10 ----------------------
ISO 21806-1:2020(E)
3.25
fall time

time interval between the instants at which the instantaneous value of a pulse again reaches a specified

upper value and then a specified lower value

Note 1 to entry: Unless otherwise specified, the upper and lower values are fixed at 90 % and 10 % of the pulse

magnitude.

[SOURCE: IEC Electropedia, 702-03-06, modified — The term "decay time" was deleted.]

3.26
frame

repetitive set of consecutive time-slots constituting a complete cycle of a signal or of another process in

which the relative position of each time-slot in the cycle can be identified

[SOURCE: Electropedia, 704-14-01, modified — Notes 1 and 2 to entry were deleted.]

3.27
frequency reference

device, usually crystal controlled, that provides an accurate and low drift frequency standard for the

MOST network controller (3.44) and MOST network (3.43) timing
3.28
Golden PLL

hardware or software entity that is used to recover the clock required to form an eye diagram (3.24)

3.29
isochronous

qualifying a time-varying phenomenon, a timescale, or a signal the consecutive significant instants of

which are separated by time intervals that all have the same rated duration or have rated durations

equal to integral multiples of a unit duration

[SOURCE: IEC Electropedia, 702-04-13, modified — The deprecated term "synchronous" was deleted

and the Note 1 to entry was deleted.]
3.30
isochronous channel

channel (3.10) that is used to transport isochronous (3.29) data on the network frame (3.54)

3.31
jitter

set of short-term non-cumulative variations in the significant instants of a digital signal from their ideal

positions in time

[SOURCE: IEC Electropedia, 704-16-13, modified — Notes 1 and 2 to entry were deleted.]

3.32
link

signal path between a sending MOST network controller (3.44) and a receiving MOST network controller

3.33
listen-only node
node (3.57) that does not change the content of network frames (3.54)
3.34
lock

reception of three consecutive PREAMBLEs that are aligned to the bit stream and occur at the correct

bit location in the network frame (3.54)
3.35
lock flag
flag that the TimingMaster (3.81) sets when it reaches stable lock (3.34)
4 © ISO 2020 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 21806-1:2020(E)
3.36
logical node address

address value for point-to-point transfers between nodes (3.57) that may be assigned independent of

the node position
3.37
low-level retry
retransmission of the channel frame (3.11) after a certain waiting period
3.38
MOST50
MOST network (3.43) with a bit rate (3.6) of 50 Mbit/s
3.39
MOST150
MOST network (3.43) with a bit rate (3.6) of 150 Mbit/s
3.40
MOST component
hardware part of a MOST device (3.41)

Note 1 to entry: MOST components are, for example, EOC, OEC, MNC, and pigtail. A MOST component can consist

of other MOST components.
3.41
MOST device

electronic control unit (3.22) that contains optical or electrical MOST components (3.40)

3.42
MOST module
MOST components (3.40) that consists of multiple MOST components
3.43
MOST network
communication network connecting MOST devices (3.41)
3.44
MOST network controller
MNC

MOST components (3.40) that performs routing and manages MOST network (3.43) resources

3.45
MOST network service

intermediate layer providing routines to simplify the handling of the MOST network controller (3.44)

3.46
MOST node

entity in the MOST network (3.43) with an assignable logical node address (3.36) and an implemented

MOST network service (3.45) library
3.47
MOST output
output of the MOST network controller (3.44)
3.48
MOST port
MOST network controller's (3.44) connection point to the MOST transceiver (3.49)
3.49
MOST transceiver
transceiver for the MOST network (3.43)
© ISO 2020 – All rights reserved 5
---------------------- Page: 12 ----------------------
ISO 21806-1:2020(E)
3.50
multi-node device
MOST device (3.41) that contains more than one node (3.57)
3.51
NetInterface
communication section of the TimingMaster (3.81) or a TimingSlave (3.83)
3.52
network activity
presence of valid MOST data (3.89) at the input
3.53
network change event
NCE
event that indicates a change of the visible nodes (3.57) value
3.54
network frame
underlying frame (3.26) for all other frame types in the MOST network (3.43)
3.55
network frame rate
periodic repetition frequency of the network frame (3.54)

Note 1 to entry: The default sampling frequency and the network frame rate in a MOST network (3.43) are

identical. Therefore, the abbreviation Fs is used.
3.56
network owner

entity that is responsible for the initial integrity of the network at design time

3.57
node
TimingMaster (3.81), TimingSlave (3.83), or listen-only node (3.33)
3.58
node position address
addresses that is based on the node (3.57) counter value
3.59
packet channel
channel (3.10) that is used to transport packet data (3.60)
3.60
packet data
anisochronous (3.4) data packets
3.61
phase variation

time deviation between the edges of a real signal and the edges of a reference signal (3.63)

3.62
probability density function
PDF
for the distribution function f of the argument x, derivative df(x)/dx

[SOURCE: IEC Electropedia, 103-08-09, modified — The term "probability density" was deleted.]

6 © ISO 2020 – All rights reserved
---------------------- Page: 13 ----------------------
ISO 21806-1:2020(E)
3.63
reference signal
ideal signal formed according to the reference time base (3.64)
3.64
reference time base

network frame rate (3.55) as defined by the crystal oscillator of the TimingMaster (3.81)

3.65
remote-controlled node

TimingSlave (3.83) that is not required to implement the MOST network service (3.45)

3.66
rise time

interval of time between the instants at which the instantaneous value of a pulse first reaches a

specified lower value and then a specified upper value
[SOURCE: IEC Electropedia, 702-03-05, modified — Note 1 to entry was deleted.]
3.67
segment
control frame (3.15) in a segmented transfer
3.68
serial data analyser
SDA

instrument used to perform industry standard jitter (3.31) and amplitude measurements and

operations on a serial data stream
3.69
shutdown flag
flag that indicates an imminent shutdown
3.70
simplex

pertaining to a method of operation in which information can be transmitted in either direction, but

not simultaneously, between two points

[SOURCE: IEC Electropedia, 701-03-161, modified — The deprecated term "half-duplex" was deleted.]

3.71
source address
logical node address (3.36) of the sender
3.72
source data
streaming data (3.75) and packet data (3.60)
3.73
specification point
SP[n]

interface that is a boundary between a transmitting and a receiving MOST component (3.40)

3.74
streaming connection
reserved bandwidth on the network identified by a connection label (3.12)
3.75
streaming data

content, such as audio or video data, which is transmitted synchronously (3.77) or isochronously (3.29)

© ISO 2020 – All rights reserved 7
---------------------- Page: 14 ----------------------
ISO 21806-1:2020(E)
3.76
sudden signal off
SSO
unexpected disappearance of network activity (3.52)
3.77
synchronous

qualifying two time-varying phenomena, time-scales, or signals characterized by corresponding

significant instants which are separated by time intervals of a constant desired duration

Note 1 to entry: In practice, any variations of the time intervals are constrained within specified limits.

Note 2 to entry: Two phenomena, time-scales, or signals may be synchronous without being isochronous (3.29).

Note 3 to entry: For periodic phenomena, time-scales or signals, the corresponding significant instants occur at

the same average rate.
[SOURCE: IEC Electropedia, 704-13-15]
3.78
synchronous channel

channel (3.10) that is used to transport synchronous (3.77) data on the network frame (3.54)

3.79
target address
node position address (3.58), logical address, or group address
3.80
telegram
single control frame (3.15)
3.81
TimingMaster
provider of the network clock
3.82
TimingMaster delay tolerance
MDT

maximum amount of propagation delay through the MOST network (3.43) that the TimingMaster (3.81)

accepts without failure
3.83
TimingSlave
node (3.57) that obtains the network clock from the MOST network (3.43)
3.84
transferred jitter
jitter (3.31) that is propagated through the network
3.85
transferred wander
wander (3.90) that is propagated through the network
3.86
uncorrelated jitter

jitter (3.31) that is not correlated to any other jitter (3.31) source in the MOST network (3.43)

8 © ISO 2020 – All rights reserved
---------------------- Page: 15 ----------------------
ISO 21806-1:2020(E)
3.87
unit interval

longest time interval such that the rated durations of the significant intervals of a signal are all whole

multiple of the duration of this interval

[SOURCE: IEC Electropedia, 721-02-32, modified — The term "signal element" was deleted.]

3.88
unlock

failure to receive an aligned PREAMBLE at the correct bit location for two consecutive frames (3.26),

once locked
3.89
valid MOST data

direct-current-adaptive-encoded data that meets defined link (3.32) quality parameters and bit rate

(3.6) requirements
3.90
wander

long-term non-cumulative variations in the significant instants of a digital signal from their ideal

positions in time
[SOURCE: IEC Electropedia, 704-16-14]
4 Symbols and abbreviated terms
4.1 Symbols
--- empty cell/undefined
4.2 Abbreviated terms
AJ alignment jitter
AL application layer
API application programming interface
BR bit rate
CL connection label
CT conformance test
CTC conformance test case
CTP conformance test plan
DLL data link layer
DTCP Digital Transmission Content Protection
ECU electronic control unit
ePHY electrical physical layer
FBlock function block
© ISO 2020 – All rights reserved 9
---------------------- Page: 16 ----------------------
ISO 21806-1:2020(E)
Fs network frame rate
HDCP High-bandwidth Digital Content Protection
IUT implementation under test
LSb least significant bit
LT lower tester
MNC MOST network controller
MOST Media Oriented Systems Transport
MSb most significant bit
NCE network change event
NL network layer
oPHY optical physical layer
PHY physical layer
PL presentation layer
PLL phase locked loop
POF plastic optical fibre
QoS quality of service
REQ requirement
SL session layer
SSO sudden signal off
STP shielded twisted pair
TDM time-division-multiplexing
TJ transferred jitter
TL transport layer
UT upper tester
UTP unshielded twisted pair
5 Access to MOST specification versions
5.1 General

The ISO standards maintenance portal provides references to the normative and supplemental MOST

specifications. The documents listed in Annex A shall be applied for the selected MOST version. The

documents listed in Annex B contain additional information for the selected MOST version. These

documents comprise different MOST versions:

— MOST version 4V0 specifications are referenced by the ISO 21806 series. Under ISO conformance,

deviations are managed between the manufacturers. The ISO 21806 series is technically equivalent.

10 © ISO 2020 – All rights reserved
---------------------- Page: 17 ----------------------
ISO 21806-1:2020(E)

— MOST version 3V1 specifications are referenced by the ISO 21806 series. Under ISO conformance,

deviations are managed between the manufacturers. The ISO 21806 series is technically equivalent.

— MOST version 3V0 specifications are only referenced by this document. MOST version 3V0

implementations shall be in accordance with MOST Specification Rev. 3.0.0E2, 07/2010. The

compliance test specifications in the MOST version 3V0 are used for conformance testing according to

this document (“conformity according to ISO 21806-1, MOST version 3V0”). Under ISO conformance,

deviations are managed between the manufacturers.

— MOST version 2V5 specifications are only referenced by this document. MOST version 2V5

implementations shall be in accordance with MOST Specification Rev. 2.5.0, 10/2006. The compliance

test specifications in the MOST version 2V5 are used for conformance testing according to this

document (“conformity according to ISO 21806-1, MOST version 2V5”). Under ISO conformance,

deviations are managed between the manufacturers.
5.2 ISO standards maintenance portal

The ISO standards maintenance portal is accessible using this URL: https:// standards .iso .org/ iso/

21806/ -1/ ed -1/ en.

Figure 3 shows where the document, for example "Access_To_MOST_Versions_2019-07.pdf", is located.

The "Access_To_MOST_Versions_2019-07.pdf" document contains hyperlinks to the content that is listed

in Annex A and Annex B.
Figure 3 — Overview of directory structure

The "Access_To_MOST_Versions_2019-07.pdf" document filename is modified each time a newer version

is available. The release date (year: 2019, month: July) is encoded in the filename.

EXAMPLE "Access_To_MOST_Versions_2020-01.pdf" is an example of a document released in January 2020.

5.3 MOST versions directory structure

Figure 4 illustrates the MOST versions directory structure as listed in Annex A and Annex B.

© ISO 2020 – All rights reserved 11
---------------------- Page: 18 ----------------------
ISO 21806-1:2020(E)
Figure 4 — MOST versions directory structure
st nd
The general directory structure consi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.