ISO 21806-8:2020
(Main)Road vehicles — Media Oriented Systems Transport (MOST) — Part 8: 150-Mbit/s optical physical layer
Road vehicles — Media Oriented Systems Transport (MOST) — Part 8: 150-Mbit/s optical physical layer
This document specifies the 150-Mbit/s optical physical layer for MOST (MOST150 oPHY), a synchronous time-division-multiplexing network. This document specifies the applicable constraints and defines interfaces and parameters, suitable for the development of products based on MOST150 oPHY. Such products include fibre optical links and connectors, fibre optic receivers, fibre optic transmitters, electrical to optical converters, and optical to electrical converters. This document also establishes basic measurement techniques and actual parameter values for MOST150 oPHY.
Véhicules routiers — Système de transport axé sur les médias — Partie 8: Couche optique physique à150-Mbit/s
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INTERNATIONAL ISO
STANDARD 21806-8
First edition
2020-10
Road vehicles — Media Oriented
Systems Transport (MOST) —
Part 8:
150-Mbit/s optical physical layer
Véhicules routiers — Système de transport axé sur les médias —
Partie 8: Couche optique physique à150-Mbit/s
Reference number
ISO 21806-8:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 21806-8:2020(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 21806-8:2020(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 . 3
5 Conventions . 4
6 Physical layer service interface to OSI data link layer . 4
6.1 Overview . 4
6.2 Data type definitions . 4
6.3 Event indications and action requests . 4
6.3.1 P_EVENT.INDICATE . 4
6.3.2 P_ACTION.REQUEST . 4
6.4 Parameters . 4
6.4.1 PHY_Event . 4
6.4.2 PHY_Request . . 5
7 Basic physical layer requirements . 5
7.1 Logic terminology . 5
7.1.1 Single-ended low-voltage digital signals . 5
7.1.2 Differential LVDS signals . 6
7.2 Specification points (SPs) . 6
7.3 Phase variation . 7
7.3.1 General. 7
7.3.2 Wander . 7
7.3.3 Jitter . 7
7.3.4 Clock recovery and reference clock . 8
7.3.5 Link quality . 9
7.3.6 MOST network quality .10
8 MOST150 oPHY requirements .14
8.1 General MOST network parameters .14
8.1.1 MOST network coding .14
8.1.2 Specification Point details.15
8.2 Models and measurement methods .16
8.2.1 Golden PLL .16
8.2.2 Jitter filter .17
8.2.3 Retimed bypass mode and stress pattern .18
8.2.4 Optical signal level detection .18
8.2.5 Region of optical signal level detection .18
9 Link specifications .19
9.1 General .19
9.2 Specification Point 1 (SP1) .19
9.3 Specification Point 2 (SP2) .21
9.3.1 Link quality parameters .21
9.3.2 Optical overshoot and undershoot .23
9.4 Specification Point 3 (SP3) .26
9.5 Specification Point 4 (SP4) .27
10 Power-on and power-off .28
10.1 Frequency reference and power supply .28
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ISO 21806-8:2020(E)
10.2 Power supply monitoring circuitry .29
10.3 Optical and electrical signal power state .29
10.3.1 General.29
10.3.2 EOC requirements .29
10.3.3 EOC power-on and power-off sequence .31
10.3.4 OEC requirements .32
10.3.5 OEC power-on and power-off sequence .34
11 MOST network requirements .35
11.1 SP4 receiver tolerance .35
11.2 TimingMaster delay tolerance .36
11.3 Optical fibre link length requirement .36
11.4 Environmental requirements and considerations .36
12 Electrical interfaces .36
12.1 LVDS .36
12.2 Bit rate and frequency tolerance .37
13 FOT packaging .37
13.1 SMD package .37
13.1.1 SMD FOT package reference drawings .37
13.1.2 SMD FOT pinout.37
13.1.3 SMD OEC signal definitions .38
13.1.4 SMD EOC signal definitions .39
13.2 Through-hole mount (THM) package .39
13.2.1 THM FOT package reference drawings .39
13.2.2 THM FOT pinout .40
13.2.3 THM OEC signal definitions .40
13.2.4 THM EOC signal definitions .40
13.3 Small form connector 2+0 SMD 7-Pin-package .41
13.3.1 2+0 Small form connector SMD 7-Pin-package reference drawings .41
13.3.2 Small form connector 2+0 SMD 7-Pin-package FOT pinout .41
13.3.3 7-Pin OEC signal definitions.42
13.3.4 7-Pin EOC signal definitions.42
13.4 MOST150 FO-Transceiver THM 180° .43
13.4.1 MOST150 FO-Transceiver THM 180° reference drawings .43
13.4.2 MOST150 FO-Transceiver THM 180° FOT pinout .43
13.4.3 MOST150 FO-Transceiver THM 180° OEC signal definitions .43
13.4.4 MOST150 FO-Transceiver THM 180° EOC signal definitions .43
13.5 MOST150 FO-Transceiver SMD 90° .43
13.5.1 MOST150 FO-Transceiver SMD 90° reference drawings .43
13.5.2 MOST150 FO-Transceiver SMD 90° FOT pinout .43
13.5.3 MOST150 FO-Transceiver SMD 90° OEC signal definitions .44
13.5.4 MOST150 FO-Transceiver SMD 90° EOC signal definitions .44
14 Device connectors .45
14.1 Connector interfaces .45
14.2 Connector interface loss .45
Bibliography .47
iv © ISO 2020 – All rights reserved
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ISO 21806-8:2020(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
---------------------- Page: 5 ----------------------
ISO 21806-8:2020(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
[4]
— 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
---------------------- Page: 6 ----------------------
ISO 21806-8:2020(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
[2] [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 2020 – All rights reserved vii
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ISO 21806-8:2020(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
---------------------- Page: 8 ----------------------
INTERNATIONAL STANDARD ISO 21806-8:2020(E)
Road vehicles — Media Oriented Systems Transport
(MOST) —
Part 8:
150-Mbit/s optical physical layer
1 Scope
This document specifies the 150-Mbit/s optical physical layer for MOST (MOST150 oPHY), a
synchronous time-division-multiplexing network.
This document specifies the applicable constraints and defines interfaces and parameters, suitable for
the development of products based on MOST150 oPHY. Such products include fibre optical links and
connectors, fibre optic receivers, fibre optic transmitters, electrical to optical converters, and optical to
electrical converters.
This document also establishes basic measurement techniques and actual parameter values for
MOST150 oPHY.
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
IEC 60825-2, Safety of laser products — Part 2: Safety of optical fibre communication systems (OFCS)
2)
JEDEC MS-013E , Standard — Very Thick Profile, Plastic Small Outline (SO) Family, 1,27 mm pitch, 7,50 mm
(.300 inch) Body Width. B1R-PDSO/SOP/SOIC
3)
JEDEC No. JESD8C.01 , Interface Standard for Nominal 3 V/3,3 V Supply Digital Integrated Circuits
4)
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 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
2) Available at https:// www .jedec .org/ .
3) Available at https:// www .jedec .org/ .
4) Available at https:// www .tiaonline .org/ standards/ .
© ISO 2020 – All rights reserved 1
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ISO 21806-8:2020(E)
3.1
electrical to optical converter
EOC
MOST component that converts an electrical signal into an optical signal
3.2
MOST150 oPHY
150-Mbit/s optical physical layer
3.3
numerical aperture
NA
sine of the vertex angle of the largest cone of meridional rays that can enter or leave an optical system
or element, multiplied by the refractive index of the medium in which the vertex of the cone is located
[SOURCE: IEC Electropedia, 731-03-85]
3.4
optical to electrical converter
OEC
MOST component that converts an optical signal into an electrical signal
3.5
pigtail
short length of optical fibre, permanently attached to a component and intended to facilitate jointing
between that component and another optical fibre or component
[SOURCE: IEC Electropedia, 731-05-08, modified — The term was originally "optical fibre pigtail" and
the Note 1 to entry has been deleted.]
4 Symbols and abbreviated terms
4.1 Symbols
--- empty cell/undefined
b the optical signal level when a logic 0 is transmitted
0
b the optical signal level when a logic 1 is transmitted
1
N bits per frame
BPF
ρ network frame rate
Fs
ρ bit rate
BR
T ambient temperature
A
t TimingMaster delay tolerance
MDT
t unit interval
UI
V output high voltage
OH
V output low voltage
OL
2 © ISO 2020 – All rights reserved
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ISO 21806-8:2020(E)
4.2 Abbreviated terms
BER bit error rate
BPF bits per frame
Cd[n] condition
DC direct current
DCA DC adaptive
DDJ data-dependant jitter
DLL data link layer
DSV digital sum value
ECU electronic control unit
EOC electrical to optical converter
EMC electromagnetic compatibility
EMI electromagnetic interference
FOR fibre optic receiver
FOT fibre optic transceiver
FOX fibre optic transmitter
LS low sensitivity
LVDS Low Voltage Differential Signaling
NA numerical aperture
N/A not applicable
MNC MOST network controller
OEC optical to electrical converter
oPHY optical physical layer
PCB printed circuit board
PDF probability density function
PHY physical layer
PLL phase locked loop
POF polymer (plastic) optical fibre
RMS root mean square
Rx data MOST150 oPHY automotive encoded digital bit stream being received
SDA serial data analyser
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ISO 21806-8:2020(E)
SP[n] Specification Point
TDM time-division-multiplexing
Tx data MOST150 oPH
...
DRAFT INTERNATIONAL STANDARD
ISO/DIS 21806-8
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 8:
150 Mbit/s optical physical layer
Véhicules routiers — Environnement du système axé sur les médias —
Partie 8: 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 21806-8:2019(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
---------------------- Page: 1 ----------------------
ISO/DIS 21806-8:2019(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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 21806-8:2019(E)
Contents Page
Foreword . vi
Introduction . vi
1 Scope .1
2 Normative references .3
3 Terms and definitions .4
4 Symbols and abbreviated terms .5
5 Conformance .6
6 PHY service interface to OSI data link layer .7
6.1 Overview . 7
6.2 Data type definitions . 7
6.3 Parameters . 7
6.3.1 PHY_Event . 7
6.3.2 PHY_Request . 7
6.4 Event indications and action requests . 8
6.4.1 P_EVENT.INDICATE . 8
6.4.2 P_ACTION.REQUEST . 8
7 Basic physical layer requirements .9
7.1 Logic terminology . 9
7.1.1 Single-ended low voltage digital signals . 9
7.1.2 Differential LVDS signals . 9
7.2 Phase variation . 10
7.2.1 General . 10
7.2.2 Wander . 10
7.2.3 Jitter . 10
7.2.4 Clock recovery and reference clock . 11
7.2.5 Link quality . 12
7.2.6 MOST network quality . 13
8 MOST150 oPHY requirements . 17
8.1 General MOST network parameters. 17
8.1.1 MOST network coding . 17
8.1.2 Specification point (SP) details . 18
8.2 Models and measurement methods . 19
8.2.1 General . 19
8.2.2 Golden PLL . 19
8.2.3 Jitter filter . 20
8.2.4 Retimed bypass mode and stress pattern . 21
8.2.5 Optical signal level detection . 21
8.2.6 Measurement region . 21
9 Link specifications . 22
9.1 General . 22
9.2 General requirement . 22
9.3 Specification point SP1 . 22
© ISO 2019 – All rights reserved
iii
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ISO/DIS 21806-8:2019(E)
9.4 Specification point SP2 . 24
9.4.1 Link quality parameters . 24
9.4.2 Optical overshoot and undershoot . 25
9.5 Specification point SP3 . 28
9.6 Specification point SP4 . 30
10 Power-on and power-off . 31
10.1 ECU requirements . 31
10.2 Power supply monitoring circuitry . 31
10.3 Optical and electrical signal power state . 32
10.3.1 General . 32
10.3.2 EOC requirements . 32
10.3.3 Power-on and power-off sequence . 34
10.3.4 OEC requirements . 35
10.3.5 Power-on and power-off sequence . 38
11 MOST network requirements . 39
11.1 SP4 receiver tolerance . 39
11.2 TimingMaster delay tolerance . 40
11.3 Optical fibre link length requirement . 40
11.4 Environmental requirements and considerations . 40
12 Electrical interfaces . 41
12.1 LVDS . 41
12.2 Bit rate and frequency tolerance . 41
13 FOT packaging . 42
13.1 SMD package . 42
13.1.1 SMD FOT package reference drawings . 42
13.1.2 SMD FOT pinout . 42
13.1.3 SMD OEC signal descriptions . 43
13.1.4 SMD EOC signal descriptions . 44
13.2 Through-hole mount (THM) package . 45
13.2.1 THM FOT package reference drawings . 45
13.2.2 THM FOT pinout . 45
13.2.3 THM OEC signal descriptions . 45
13.2.4 THM EOC signal descriptions . 46
13.3 Small form connector 2+0 SMD 7-Pin-package . 47
13.3.1 2+0 Small form connector SMD 7-Pin-package reference drawings . 47
13.3.2 Small form connector 2+0 SMD 7-Pin-package FOT pinout . 47
13.3.3 7-Pin OEC signal descriptions . 47
13.3.4 7-Pin EOC signal descriptions . 48
13.4 MOST150 FO-Transceiver THM 180° . 48
13.4.1 MOST150 FO-Transceiver THM 180° reference drawings . 48
13.4.2 MOST150 FO-Transceiver THM 180° FOT pinout . 49
13.4.3 MOST150 FO-Transceiver THM 180° OEC signal descriptions . 49
13.4.4 MOST150 FO-Transceiver THM 180° EOC signal descriptions . 49
13.5 MOST150 FO-Transceiver SMD 90° . 49
13.5.1 MOST150 FO-Transceiver SMD 90° reference drawings . 49
13.5.2 MOST150 FO-Transceiver SMD 90° FOT pinout . 49
13.5.3 MOST150 FO-Transceiver SMD 90° OEC signal descriptions . 49
13.5.4 MOST150 FO-Transceiver SMD 90° EOC signal descriptions . 50
14 Device connectors . 50
© ISO 2019 – All rights reserved
iv
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ISO/DIS 21806-8:2019(E)
14.1 Connector interfaces . 50
14.2 Connector interface loss . 52
Bibliography . 53
© ISO 2019 – All rights reserved
v
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ISO/DIS 21806-8:2019(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 21806-8:2019(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
vii
---------------------- Page: 7 ----------------------
ISO/DIS 21806-8:2019(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 21806-8:2019(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 21806-8:2019(E)
Road vehicles — Media oriented systems transport (MOST)
framework —
Part 8:
150 Mbit/s optical physical layer
1 Scope
This document specifies the transportation media MOST150 optical physical layer (oPHY). All MOST150
oPHY 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; the measurement methods
are generalized into a strategy used to specify any MOST150 oPHY network and guarantee operation.
This document outlines the basic measurement techniques, parameters and the 150-Mbit/s oPHY bit
rate dependant values of the measurements, methods and actual parameter values. It also contains the
constraints that govern and define interfaces and parameters, which are the base for development of
real products.
A physical connection of two MOST devices is called a link. This document describes measurements
taken at specific locations along a link. These locations are called specification points. The location of
the specification points is shown in Figure 3.
Key
Tx MOST network controller transmit terminal
Rx MOST network controller receive terminal
SP1 Specification point 1
SP2 Specification point 2
SP3 Specification point 3
SP4 Specification point 4
Figure 3 — Location of specification points along a link
SP1 and SP4 define the electrical signal requirements between a MOST network controller (MNC) with
its input Rx and output Tx and a converter. SP1 and SP2 define the transmit converter while SP3 and
SP4 define the receive converter. SP2 and SP3 define the properties of the interface between a MOST
device and a wiring harness (e.g., signal timing, signal amplitude, connector interface drawings).
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Beside the link, there are also requirements covering the stability of the MOST network. Examples are
requirements regarding jitter transfer through MOST devices and jitter accumulation around the MOST
network.
This document summarizes all parameters and definitions required for individual specification points,
as well as MOST network requirements.
The specified parameters in this document are minimum values to ensure functionality of the MOST
network in a wide range of environment conditions. Real hardware may have better performance than
requested by the standard to provide operating margin for the MOST network.
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ISO/DIS 21806-8:2019(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 21806-4, Road vehicles – Media Oriented Systems Transport (MOST) – Part 4: Transport layer and
network layer
ISO 21806-6, Road vehicles – Media Oriented Systems Transport (MOST) – Part 6: Data link layer
AEC-Q100: Failure Mechanism Based Stress Test Qualification For Integrated Circuits
[SOURCE: http://www.aecouncil.com/AECDocuments.html]
JEDEC MS-013E, Standard – Very Thick Profile, Plastic Small Outline (SO) Family, 1,27 mm pitch, 7,50 mm
(.300 inch) Body Width. B1R-PDSO/SOP/SOIC [SOURCE: http://www.jedec.org/]
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 21806-8:2019(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21806-1, 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
average pulse width distortion
APWD
average deviation of the signal pulses from their ideal width
3.2
electrical to optical converter
EOC
MOST component that converts an electrical signal into an optical signal
3.3
MOST150 oPHY
150-Mbit/s optical physical layer
3.4
numerical aperture
NA
the sine of the vertex angle of the largest cone of meridional rays that can enter or leave an optical
system or element, multiplied by the refractive index of the medium in which the vertex of the cone is
located
Source: IEC Electropedia [731-03-85]
3.5
optical to electrical converter
OEC
MOST component that converts an optical signal into an electrical signal
3.6
pigtail
a short length of optical fibre, usually permanently attached to a component and intended to facilitate
jointing between that component and another optical fibre or component
Source: IEC Electropedia [731-05-08: optical fibre pigtail]
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4 Symbols and abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 21806-1, and the following
apply.
APWD average pulse width distortion
b the optical signal level when a logic 0 is being transmitted
0
b the optical signal level when a logic 1 is being transmitted
1
BER bit error rate
BR bit rate
BPF bits per frame
DC direct current
DCA DC adaptive
DDJ data-dependant jitter
DSV digital sum value
ECU electronic control unit
EOC electrical to optical converter
EMC electromagnetic compatibility
EMI electromagnetic interference
FOR fibre optic receiver
FOT fibre optic transceiver
FOX fibre optic transmitter
Fs network frame rate
LS low sensitivity
LVDS Low-Voltage Differential Signalling
NA numerical aperture
N/A not applicable
MNC MOST network controller
OEC optical to electrical converter
oPHY optical physical layer
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PCB printed circuit board
PDF probability density function
PLL phase locked loop
POF polymer (plastic) optical fibre
RMS root mean square
Rx data MOST150 oPHY automotive encoded digital bit stream being received
SDA serial data analyser
SP[n] specification point
T ambient temperature
A
TDM time-division-multiplexing
T TimingMaster delay tolerance
MDT
Tx data MOST150 oPHY automotive encoded digital bit stream being transmitted
UI unit interval
V output high voltage
OH
V output low voltage
OL
5 Conformance
This document is based on the conventions discussed in the OSI service conventions as specified in
ISO/IEC 10731.
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6 PHY service interface to OSI data link layer
6.1 Overview
The physical layer service interface specifies the abstract interface to the OSI data link layer.
6.2 Data type definitions
The data type Enum shall be defined as 8-bit enumeration.
6.3 Parameters
6.3.1 PHY_Event
The PHY_Event lists events that are used to notify the DLL about changes, which require no additional
information.
Table 1 provides an overview of the parameters that are used in the defined service interface and
passed from the PHY to the DLL.
Table 1 — Parameters passed from the PHY to the DLL
Parameter Data type Description
PHY_Event Enum {
An event that i
...
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