ISO 20794-3:2020
(Main)Road vehicles — Clock extension peripheral interface (CXPI) — Part 3: Transport and network layer
Road vehicles — Clock extension peripheral interface (CXPI) — Part 3: Transport and network layer
This document specifies the OSI transport layer and network layer by means of services and protocols. They can be used by different applications. The transport layer: — transforms a message into a single packet; — adds protocol control information for diagnostic and node configuration into each packet; — adds packet identifier for diagnostic and node configuration into each packet; and — performs transport protocol error detection. The transport layer protocol is not used for normal communication except to map the service interface parameters between lower and upper OSI layers. The network layer: — adds a node address for diagnostic and node configuration into each segment; and — observes timing for diagnostic and node configuration of each segment. The network layer is not used for normal communication except to map the service interface parameters between lower and upper OSI layers.
Véhicules routiers — Interface du périphérique d'extension d'horloge (CXPI) — Partie 3: Transport et couche réseau
General Information
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INTERNATIONAL ISO
STANDARD 20794-3
First edition
2020-02
Road vehicles — Clock extension
peripheral interface (CXPI) —
Part 3:
Transport and network layer
Véhicules routiers — Interface du périphérique d'extension d'horloge
(CXPI) —
Partie 3: Transport et couche réseau
Reference number
©
ISO 2020
© 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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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 Overview of transport layer and network layer . 3
6.1 Properties . 3
6.2 Packet types . 3
6.3 Error detection and indication . 3
7 Service interface parameters (SIP) . 3
7.1 SIP — General . 3
7.2 SIP — Data type definitions . 4
7.3 SIP — TA, target address . 4
7.4 SIP — SA, source address. 4
7.5 SIP — Ptype, packet type . 4
7.6 SIP — ReqId, request identifier . 4
7.7 SIP — ReqTypeId, request type identifier . 5
7.8 SIP — PDU, protocol data unit . 5
7.9 SIP — Length, length of PDU . 5
7.10 SIP — NMInfo, network management information . . 5
7.11 SIP — SCT, sequence count . 5
7.12 SIP — Result, result . 6
8 Transport layer (TL) . 6
8.1 SI — T_Data.req and T_Data.ind service interface . 6
8.2 SI — T_Data.req and T_Data.ind service interface parameter mapping . 7
8.3 TL — Service interface with T_Ptype parameter mapping . 8
8.3.1 TL — T_Data.req and T_Data.ind with T_Ptype = NormalCom (T_Length = NULL) 8
8.3.2 TL — T_Data.req and T_Data.ind with T_Ptype = NormalCom (T_Length ≥ '0') . 9
8.3.3 TL — T_Data.req and T_Data.ind interface with T_Ptype = DiagNodeCfg .10
8.4 TL — Internal operation .11
8.5 TL — T_PDU .11
8.5.1 TL — T_PDU definition .11
8.5.2 TL — T_PCI definition .11
8.6 TL — Function models .12
8.6.1 TL — Transmission logic .12
8.6.2 TL — Reception logic .13
8.7 TL — Error detection .14
9 Network layer (NL) .14
9.1 SI — N_Data.req and N_Data.ind service interface .14
9.2 SI — N_Data.req and N_Data.ind service interface parameter mapping .15
9.3 NL — Service interface with N_Ptype parameter mapping .16
9.3.1 NL — N_Data.req and N_Data.ind with N_Ptype = NormalCom (N_Length =
NULL) . .16
9.3.2 TL — N_Data.req and N_Data.ind with N_Ptype = NormalCom (N_Length ≥ '0') .17
9.3.3 NL — N_Data.req and N_Data.ind interface with N_Ptype = DiagNodeCfg .18
9.4 NL — Internal operation .19
9.5 NL — N_PDU .19
9.5.1 NL — N_PDU definition .19
9.5.2 NL — N_NAD definition .19
9.6 NL — Function models.20
9.6.1 NL — Transmission logic .20
9.6.2 NL — Reception logic.20
9.7 NL — Timing definition .21
9.7.1 NL — General .21
9.7.2 NL — Timing constraints .21
9.7.3 NL — Timing parameters .22
9.8 NL — Error detection .22
Bibliography .23
iv © ISO 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
A list of all parts in the ISO 20794 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.
Introduction
ISO 20794 (all parts) specifies the application (partly), application layer, transport layer, network
layer, data link layer, and physical layer requirements of an in-vehicle network called "clock
...
INTERNATIONAL ISO
STANDARD 20794-3
First edition
2020-02
Road vehicles — Clock extension
peripheral interface (CXPI) —
Part 3:
Transport and network layer
Véhicules routiers — Interface du périphérique d'extension d'horloge
(CXPI) —
Partie 3: Transport et couche réseau
Reference number
©
ISO 2020
© 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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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 Overview of transport layer and network layer . 3
6.1 Properties . 3
6.2 Packet types . 3
6.3 Error detection and indication . 3
7 Service interface parameters (SIP) . 3
7.1 SIP — General . 3
7.2 SIP — Data type definitions . 4
7.3 SIP — TA, target address . 4
7.4 SIP — SA, source address. 4
7.5 SIP — Ptype, packet type . 4
7.6 SIP — ReqId, request identifier . 4
7.7 SIP — ReqTypeId, request type identifier . 5
7.8 SIP — PDU, protocol data unit . 5
7.9 SIP — Length, length of PDU . 5
7.10 SIP — NMInfo, network management information . . 5
7.11 SIP — SCT, sequence count . 5
7.12 SIP — Result, result . 6
8 Transport layer (TL) . 6
8.1 SI — T_Data.req and T_Data.ind service interface . 6
8.2 SI — T_Data.req and T_Data.ind service interface parameter mapping . 7
8.3 TL — Service interface with T_Ptype parameter mapping . 8
8.3.1 TL — T_Data.req and T_Data.ind with T_Ptype = NormalCom (T_Length = NULL) 8
8.3.2 TL — T_Data.req and T_Data.ind with T_Ptype = NormalCom (T_Length ≥ '0') . 9
8.3.3 TL — T_Data.req and T_Data.ind interface with T_Ptype = DiagNodeCfg .10
8.4 TL — Internal operation .11
8.5 TL — T_PDU .11
8.5.1 TL — T_PDU definition .11
8.5.2 TL — T_PCI definition .11
8.6 TL — Function models .12
8.6.1 TL — Transmission logic .12
8.6.2 TL — Reception logic .13
8.7 TL — Error detection .14
9 Network layer (NL) .14
9.1 SI — N_Data.req and N_Data.ind service interface .14
9.2 SI — N_Data.req and N_Data.ind service interface parameter mapping .15
9.3 NL — Service interface with N_Ptype parameter mapping .16
9.3.1 NL — N_Data.req and N_Data.ind with N_Ptype = NormalCom (N_Length =
NULL) . .16
9.3.2 TL — N_Data.req and N_Data.ind with N_Ptype = NormalCom (N_Length ≥ '0') .17
9.3.3 NL — N_Data.req and N_Data.ind interface with N_Ptype = DiagNodeCfg .18
9.4 NL — Internal operation .19
9.5 NL — N_PDU .19
9.5.1 NL — N_PDU definition .19
9.5.2 NL — N_NAD definition .19
9.6 NL — Function models.20
9.6.1 NL — Transmission logic .20
9.6.2 NL — Reception logic.20
9.7 NL — Timing definition .21
9.7.1 NL — General .21
9.7.2 NL — Timing constraints .21
9.7.3 NL — Timing parameters .22
9.8 NL — Error detection .22
Bibliography .23
iv © ISO 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
A list of all parts in the ISO 20794 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.
Introduction
ISO 20794 (all parts) specifies the application (partly), application layer, transport layer, network
layer, data link layer, and physical layer requirements of an in-vehicle network called "clock
...
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