Intelligent transport systems -- Roadside modules SNMP data interface

Field devices are a key component in intelligent transport systems (ITS). Field devices include traffic signals, message signs, weather stations, traffic sensors, roadside equipment for connected ITS (C-ITS) environments, etc. Field devices often need to exchange information with other external entities (managers). Field devices can be quite complex necessitating the standardization of many data concepts for exchange. As such, the ISO 20684Â series is divided into several individual parts. This part of the ISO 20684Â series identifies basic user needs for the management of virtually any field device and traces these needs to interoperable designs. This includes the ability to identify the device, its capabilities, and its status. NOTEÂ Â Â Â Â Â This document is similar to portions of NTCIP 1103Â v03 and NTCIP 1201Â v03. ISO 20684-1 provides additional details about how the ISO 20684Â series relates to the overall ITS architecture.

Systèmes de transport intelligents -- Interface de données SNMP pour les modules en bord de route

General Information

Status
Published
Publication Date
26-May-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
12-Apr-2021
Completion Date
12-Apr-2021
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TECHNICAL ISO/TS
SPECIFICATION 20684-2
First edition
2021-05
Intelligent transport systems —
Roadside modules SNMP data
interface —
Part 2:
Generalized field device basic
management
Systèmes de transport intelligents — Interface de données SNMP pour
les modules en bord de route —
Partie 2: Gestion de base d'appareil de terrain généralisé
Reference number
ISO/TS 20684-2:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO/TS 20684-2:2021(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/TS 20684-2:2021(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

5 Conformance ............................................................................................................................................................................................................. 2

6 Architecture ............................................................................................................................................................................................................... 6

6.1 General ........................................................................................................................................................................................................... 6

6.2 Architecture reference ......... ............................................................................................................................................................. 7

6.3 Functional view of interface ........................................................................................................................................................ 7

6.4 Physical view of interface .............................................................................................................................................................. 7

6.5 Communications view of interface ........................................................................................................................................ 7

6.5.1 Overview ................................................................................................................................................................................. 7

6.5.2 Security and data protection ................................................................................................................................. 8

7 User needs ................................................................................................................................................................................................................... 8

7.1 Monitor the field device .................................................................................................................................................................. 8

7.2 Monitor and control single-value inputs and outputs .......................................................................................... 8

7.3 Monitor cabinet ...................................................................................................................................................................................... 9

7.3.1 Monitor cabinet doors ........................................................................................................................................... ...... 9

7.3.2 Monitor and control cabinet fans ...................................................................................................................... 9

7.3.3 Monitor and control cabinet heaters .............................................................................................................. 9

7.3.4 Monitor cabinet humidity ........................................................................................................................................ 9

7.3.5 Monitor cabinet temperature ............................................................................................................................... 9

7.3.6 Monitor cabinet mains power .............................................................................................................................. 9

7.3.7 Monitor cabinet battery power ........................................................................................................................... 9

7.3.8 Monitor cabinet generator power ..................................................................................................................... 9

7.3.9 Monitor cabinet solar power ................................................................................................................................. 9

7.3.10 Monitor cabinet wind power ................................................................................................................................. 9

8 Requirements .......................................................................................................................................................................................................10

8.1 Field device requirements .........................................................................................................................................................10

8.1.1 Field device definition ..............................................................................................................................................10

8.1.2 Field device data exchange requirements ...............................................................................................10

8.1.3 Field device capabilities .........................................................................................................................................11

8.1.4 Field device design constraints ........................................................................................................................11

8.2 General-purpose I/O .......................................................................................................................................................................12

8.2.1 General-purpose I/O definition .......................................................................................................................12

8.2.2 General-purpose I/O data exchange requirements ........................................................................12

8.2.3 General-purpose I/O capabilities ...................................................................................................................13

8.3 Cabinet ........................................................................................................................................................................................................13

8.3.1 Cabinet definition .........................................................................................................................................................13

8.3.2 Cabinet data exchange requirements..........................................................................................................13

8.3.3 Cabinet power capability requirements ...................................................................................................13

8.4 Cabinet doors ........................................................................................................................................................................................14

8.4.1 Cabinet door definition ...........................................................................................................................................14

8.4.2 Cabinet door data exchange requirements ............................................................................................14

8.4.3 Cabinet door capability requirements .......................................................................................................14

8.4.4 Cabinet door design constraints......................................................................................................................14

8.5 Cabinet fans ............................................................................................................................................................................................14

8.5.1 Cabinet fan definition ...............................................................................................................................................14

8.5.2 Cabinet fan data exchange requirements ................................................................................................14

© ISO 2021 – All rights reserved iii
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ISO/TS 20684-2:2021(E)

8.5.3 Cabinet fan capability requirements ...........................................................................................................14

8.5.4 Cabinet fan design constraints ..........................................................................................................................15

8.6 Cabinet heaters ....................................................................................................................................................................................15

8.6.1 Cabinet heater definition .......................................................................................................................................15

8.6.2 Cabinet heater data exchange requirements ........................................................................................15

8.6.3 Cabinet heater capability requirements ...................................................................................................15

8.6.4 Cabinet heater design constraints .................................................................................................................15

8.7 Cabinet humidity ................................................................................................................................................................................15

8.7.1 Cabinet humidity definition ................................................................................................................................15

8.7.2 Cabinet humidity data exchange requirements .................................................................................15

8.7.3 Cabinet humidity capability requirements ............................................................................................15

8.7.4 Cabinet humidity design constraints ..........................................................................................................16

8.8 Cabinet temperature .......................................................................................................................................................................16

8.8.1 Cabinet temperature definition .......................................................................................................................16

8.8.2 Cabinet temperature data exchange requirements ........................................................................16

8.8.3 Cabinet temperature capability requirements ...................................................................................16

8.8.4 Cabinet temperature design constraints ..................................................................................................16

8.9 Cabinet mains power ......................................................................................................................................................................16

8.9.1 Cabinet mains power definition ......................................................................................................................16

8.9.2 Cabinet mains power data exchange requirements .......................................................................16

8.9.3 Cabinet mains power capability requirements ..................................................................................16

8.9.4 Cabinet mains power design constraints.................................................................................................17

8.10 Cabinet battery ....................................................................................................................................................................................17

8.10.1 Cabinet battery definition .....................................................................................................................................17

8.10.2 Cabinet battery data exchange requirements ......................................................................................17

8.10.3 Cabinet battery capability requirements .................................................................................................17

8.10.4 Cabinet battery design constraints ...............................................................................................................17

8.11 Cabinet generator ..............................................................................................................................................................................18

8.11.1 Cabinet generator definition ..............................................................................................................................18

8.11.2 Cabinet generator data exchange requirements ...............................................................................18

8.11.3 Cabinet generator capability requirements ..........................................................................................18

8.11.4 Cabinet generator design constraints .........................................................................................................18

8.12 Cabinet solar power ......... ................................................................................................................................................................19

8.12.1 Cabinet solar power definition .........................................................................................................................19

8.12.2 Cabinet solar power data exchange requirements ..........................................................................19

8.12.3 Cabinet solar power capability requirements .....................................................................................19

8.12.4 Cabinet solar power design constraints ...................................................................................................19

8.13 Cabinet wind power ........................................................................................................................................................................19

8.13.1 Cabinet wind power feature ...............................................................................................................................19

8.13.2 Cabinet wind power data exchange requirements ..........................................................................19

8.13.3 Cabinet wind power capability requirements .....................................................................................20

8.13.4 Cabinet wind power design constraints ...................................................................................................20

9 Security vulnerabilities ..............................................................................................................................................................................20

Annex A (normative) Management information base (MIB) ....................................................................................................21

Annex B (normative) Requirements traceability matrix (RTM) ...........................................................................................34

Annex C (normative) Standard general-purpose I/O types .......................................................................................................38

Annex D (informative) User needs, features and requirements not included .......................................................39

Bibliography .............................................................................................................................................................................................................................40

iv © ISO 2021 – All rights reserved
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ISO/TS 20684-2:2021(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 204, Intelligent transport systems.

A list of all parts in the ISO 20684 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/TS 20684-2:2021(E)
Introduction
0.1 Background

The need for standardized communication with ITS field devices is growing around the world. Several

countries have adopted SNMP-based field device communication standards.

There is a growing view and empirical evidence that standardizing this activity will result in improved

ITS performance, reduced cost, reduced deployment time, and improved maintainability. The

ISO 20684 series extends ISO 15784-2 by defining the management information necessary to monitor,

configure and control features of field devices. The data elements in all parts of the ISO 20684 series

may be used with any relevant protocol, but were designed with an expectation that they would be

used with one of the ISO 15784-2 protocols.

By using this approach, agencies can specify open procurements and systems can be expanded

geographically in an open and non-proprietary manner which reduces costs, speeds up deployment and

simplifies integration.
0.2 Overview

SNMP is a collection of well thought-out and well-proven concepts and principles. SNMP employs the

sound principles of abstraction and standardization. This has led to SNMP being widely accepted as the

prime choice for communication between management systems and devices on the Internet and other

communications networks.

The original implementation of SNMP was used to manage network devices such as routers and

switches. Since then, the use of SNMP has grown into many areas of application on the Internet and has

also been used successfully over various serial communications networks.

This document defines management information for ITS field devices following the SNMP conventions.

0.3 Document approach and layout
This document defines:
a) Conformance tables for this document (Clause 5);
b) Architectural assumptions made by this document (Clause 6);

c) User needs that are deemed to be common to many types of field devices (Clause 7);

d) Requirements for implementing the identified user needs, organized by major feature (Clause 8);

e) Security vulnerabilities that should be considered by implementers of this document (Clause 9);

f) The management information base (MIB) for the features defined by this document (Annex A);

g) A requirements traceability table that traces requirements to the design elements (Annex B);

h) A series of standardized codes that can be used to identify types of sensors and actuators (Annex C);

i) The user needs, features and requirements that were considered for but not included in this

document (Annex D).

In addition, a simplified version of the conformance table and the MIBs are available electronically at

https:// standards .iso .org/ iso/ ts/ 20684/ -2/ ed -1/ en/ .
vi © ISO 2021 – All rights reserved
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TECHNICAL SPECIFICATION ISO/TS 20684-2:2021(E)
Intelligent transport systems — Roadside modules SNMP
data interface —
Part 2:
Generalized field device basic management
1 Scope

Field devices are a key component in intelligent transport systems (ITS). Field devices include traffic

signals, message signs, weather stations, traffic sensors, roadside equipment for connected ITS (C-ITS)

environments, etc.

Field devices often need to exchange information with other external entities (managers). Field devices

can be quite complex necessitating the standardization of many data concepts for exchange. As such,

the ISO 20684 series is divided into several individual parts.

This part of the ISO 20684 series identifies basic user needs for the management of virtually any field

device and traces these needs to interoperable designs. This includes the ability to identify the device,

its capabilities, and its status.
NOTE This document is similar to portions of NTCIP 1103 v03 and NTCIP 1201 v03.

ISO 20684-1 provides additional details about how the ISO 20684 series relates to the overall ITS

architecture.
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 20684-1, Intelligent transport systems — Roadside modules SNMP data interface — Part 1: Overview

IETF RFC 2578, Structure of Management Information Version 2 (SMIv2), April 1999
IETF RFC 2579, Textual Conventions for SMIv2, April 1999.
IETF RFC 2580, Conformance Statements for SMIv2, April 1999.

IETF RFC 3411, An Architecture for Describing Simple Network Management Protocol (SNMP) Management

Frameworks, December 2002

IETF RFC 3418, Management Information Base (MIB) for the Simple Network Management Protocol

(SNMP), December 2002
IETF RFC 6933, Entity MIB (Version 4), May 2013
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 20684-1 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
© ISO 2021 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO/TS 20684-2:2021(E)
— IEC Electropedia: available at http:// www .electropedia .org/
4 Symbols and abbreviated terms
AC alternating current
C-ITS connected intelligent transport systems
I/O input/output
IEC International Electrotechnical Commission
IETF Internet Engineering Task Force
ISO International Organization for Standardization
ITS intelligent transport systems
MIB management information base
NTCIP national transportation communications for ITS protocol
RFC request for comments
RTM requirements traceability matrix
SNMP simple network management protocol
5 Conformance

This conformance section follows the rules defined in ISO 20684-1. Table 1 traces each user need to a

set of software features. Table 2 traces each feature to a set of requirements. Table 3 defines terms that

are used as predicates in the conformance codes listed in Tables 1 and 2. The ISO 20684-2 PICS file is

available electronically at https:// standards .iso .org/ iso/ ts/ 20684/ -2/ ed -1/ en/ . For a full understanding

of these tables and codes, see ISO 20684-1.
Table 1 — User need and feature conformance
Need Requirement Conformance
7.1: Monitor the field device M
8.1: Field device requirements M
8.3: Cabinet M
7.2: Monitor and control single-value inputs and out-
puts
8.2: General-purpose I/O M
7.3.1: Monitor cabinet doors O
8.2: General-purpose I/O M
8.4: Cabinet doors M
7.3.2: Monitor and control cabinet fans O
8.2: General-purpose I/O M
8.5: Cabinet fans M
7.3.3: Monitor and control cabinet heaters O
8.2: General-purpose I/O M
8.6: Cabinet heaters M
2 © ISO 2021 – All rights reserved
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ISO/TS 20684-2:2021(E)
Table 1 (continued)
Need Requirement Conformance
7.3.4: Monitor cabinet humidity O
8.2: General-purpose I/O M
8.7: Cabinet humidity M
7.3.5: Monitor cabinet temperature O
8.2: General-purpose I/O M
8.8: Cabinet temperature M
7.3.6: Monitor cabinet mains power O.1 (1..*)
8.2: General-purpose I/O M
8.9: Cabinet mains power M
7.3.7: Monitor cabinet battery power O.1 (1..*)
8.2: General-purpose I/O M
8.10: Cabinet battery M
7.3.8: Monitor cabinet generator power O.1 (1..*)
8.2: General-purpose I/O M
8.11: Cabinet generator M
7.3.9: Monitor cabinet solar power O.1 (1..*)
8.2: General-purpose I/O M
8.12: Cabinet solar power M
7.3.10: Monitor cabinet wind power O.1 (1..*)
8.2: General-purpose I/O M
8.13: Cabinet wind power M

Annex D provides additional user needs that were considered but not included in this document.

Table 2 traces each feature to a set of requirements and defines under what conditions those

requirements could be mandatory in order to claim conformance to this document.
Table 2 — Requirement conformance
Feature Requirement Conformance
8.1: Field device requirements
8.1.2.1: Discover basic capabilities of the field device M
8.1.2.2: Discover SNMP capabilities of the field device M
8.1.2.3: Configure the field device's identity M
8.1.2.4: Identify the field device M
8.1.2.5: Identify the SNMP engine M
8.1.2.6: Monitor the field device configuration identifier M
8.1.2.7: Monitor controller operation M
8.1.2.8: Monitor controller up time M
8.1.2.9: Monitor watchdog failure count M
8.1.2.10: Reset the controller M
8.1.3.1: Field device performance requirements M
8.1.3.2: Support maximum message size M
8.1.3.3: Support changeable memory O.2 (1..*)
8.1.3.4: Support volatile memory O.2 (1..*)
8.1.4.1: Control access M
© ISO 2021 – All rights reserved 3
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ISO/TS 20684-2:2021(E)
Table 2 (continued)
8.1.4.2: Coordinate multiple managers M
8.2: General-purpose I/O
8.2.2.1: Discover general-purpose I/O capabilities M
8.2.2.2: Configure general-purpose I/O M
8.2.2.3: Retrieve configuration of general-purpose I/O M
input: M;
8.2.2.4: Monitor value from general-purpose I/O port
bidirectional: M
8.2.2.5: Monitor status of general-purpose I/O port M
8.2.2.6: Monitor status of general-purpose I/O type
...

TECHNICAL ISO/TS
SPECIFICATION 20684-2
First edition
Intelligent transport systems —
Roadside modules SNMP data
interface —
Part 2:
Generalized field device basic
management
Systèmes de transport intelligents — Interface de données SNMP pour
les modules en bord de route —
Partie 2: A Gestion de base d'ppareil de terrain généralisé
PROOF/ÉPREUVE
Reference number
ISO/TS 20684-2:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO/TS 20684-2:2021(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/TS 20684-2:2021(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

5 Conformance ............................................................................................................................................................................................................. 2

6 Architecture ............................................................................................................................................................................................................... 6

6.1 General ........................................................................................................................................................................................................... 6

6.2 Architecture reference ......... ............................................................................................................................................................. 6

6.3 Functional view of interface ........................................................................................................................................................ 6

6.4 Physical view of interface .............................................................................................................................................................. 7

6.5 Communications view of interface ........................................................................................................................................ 7

6.5.1 Overview ................................................................................................................................................................................. 7

6.5.2 Security and data protection ................................................................................................................................. 7

7 User needs ................................................................................................................................................................................................................... 8

7.1 Monitor the field device .................................................................................................................................................................. 8

7.2 Monitor and control single-value inputs and outputs .......................................................................................... 8

7.3 Monitor cabinet ...................................................................................................................................................................................... 8

7.3.1 Monitor cabinet doors ........................................................................................................................................... ...... 8

7.3.2 Monitor and control cabinet fans ...................................................................................................................... 8

7.3.3 Monitor and control cabinet heaters .............................................................................................................. 8

7.3.4 Monitor cabinet humidity ........................................................................................................................................ 8

7.3.5 Monitor cabinet temperature ............................................................................................................................... 8

7.3.6 Monitor cabinet mains power .............................................................................................................................. 8

7.3.7 Monitor cabinet battery power ........................................................................................................................... 9

7.3.8 Monitor cabinet generator power ..................................................................................................................... 9

7.3.9 Monitor cabinet solar power ................................................................................................................................. 9

7.3.10 Monitor cabinet wind power ................................................................................................................................. 9

8 Requirements .......................................................................................................................................................................................................... 9

8.1 Field device requirements ............................................................................................................................................................ 9

8.1.1 Field device definition ................................................................................................................................................. 9

8.1.2 Field device data exchange requirements .................................................................................................. 9

8.1.3 Field device capabilities .........................................................................................................................................10

8.1.4 Field device design constraints ........................................................................................................................11

8.2 General-purpose I/O .......................................................................................................................................................................11

8.2.1 General-purpose I/O definition .......................................................................................................................11

8.2.2 General-purpose I/O data exchange requirements ........................................................................11

8.2.3 General-purpose I/O capabilities ...................................................................................................................12

8.3 Cabinet ........................................................................................................................................................................................................12

8.3.1 Cabinet definition .........................................................................................................................................................12

8.3.2 Cabinet data exchange requirements..........................................................................................................12

8.3.3 Cabinet power capability requirements ...................................................................................................13

8.4 Cabinet doors ........................................................................................................................................................................................13

8.4.1 Cabinet door definition ...........................................................................................................................................13

8.4.2 Cabinet door data exchange requirements ............................................................................................13

8.4.3 Cabinet door capability requirements .......................................................................................................13

8.4.4 Cabinet door design constraints......................................................................................................................13

8.5 Cabinet fans ............................................................................................................................................................................................14

8.5.1 Cabinet fan definition ...............................................................................................................................................14

8.5.2 Cabinet fan data exchange requirements ................................................................................................14

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
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ISO/TS 20684-2:2021(E)

8.5.3 Cabinet fan capability requirements ...........................................................................................................14

8.5.4 Cabinet fan design constraints ..........................................................................................................................14

8.6 Cabinet heaters ....................................................................................................................................................................................14

8.6.1 Cabinet heater definition .......................................................................................................................................14

8.6.2 Cabinet heater data exchange requirements ........................................................................................14

8.6.3 Cabinet heater capability requirements ...................................................................................................14

8.6.4 Cabinet heater design constraints .................................................................................................................15

8.7 Cabinet humidity ................................................................................................................................................................................15

8.7.1 Cabinet humidity definition ................................................................................................................................15

8.7.2 Cabinet humidity data exchange requirements .................................................................................15

8.7.3 Cabinet humidity capability requirements ............................................................................................15

8.7.4 Cabinet humidity design constraints ..........................................................................................................15

8.8 Cabinet temperature .......................................................................................................................................................................15

8.8.1 Cabinet temperature definition .......................................................................................................................15

8.8.2 Cabinet temperature data exchange requirements ........................................................................15

8.8.3 Cabinet temperature capability requirements ...................................................................................15

8.8.4 Cabinet temperature design constraints ..................................................................................................15

8.9 Cabinet mains power ......................................................................................................................................................................16

8.9.1 Cabinet mains power definition ......................................................................................................................16

8.9.2 Cabinet mains power data exchange requirements .......................................................................16

8.9.3 Cabinet mains power capability requirements ..................................................................................16

8.9.4 Cabinet mains power design constraints.................................................................................................16

8.10 Cabinet battery ....................................................................................................................................................................................16

8.10.1 Cabinet battery definition .....................................................................................................................................16

8.10.2 Cabinet battery data exchange requirements ......................................................................................16

8.10.3 Cabinet battery capability requirements .................................................................................................16

8.10.4 Cabinet battery design constraints ...............................................................................................................17

8.11 Cabinet generator ..............................................................................................................................................................................17

8.11.1 Cabinet generator definition ..............................................................................................................................17

8.11.2 Cabinet generator data exchange requirements ...............................................................................17

8.11.3 Cabinet generator capability requirements ..........................................................................................17

8.11.4 Cabinet generator design constraints .........................................................................................................18

8.12 Cabinet solar power ......... ................................................................................................................................................................18

8.12.1 Cabinet solar power definition .........................................................................................................................18

8.12.2 Cabinet solar power data exchange requirements ..........................................................................18

8.12.3 Cabinet solar power capability requirements .....................................................................................18

8.12.4 Cabinet solar power design constraints ...................................................................................................19

8.13 Cabinet wind power ........................................................................................................................................................................19

8.13.1 Cabinet wind power feature ...............................................................................................................................19

8.13.2 Cabinet wind power data exchange requirements ..........................................................................19

8.13.3 Cabinet wind power capability requirements .....................................................................................19

8.13.4 Cabinet wind power design constraints ...................................................................................................19

9 Security vulnerabilities ..............................................................................................................................................................................19

Annex A (normative) Management information base (MIB) ....................................................................................................21

Annex B (normative) Requirements traceability matrix (RTM) ...........................................................................................34

Annex C (normative) Standard general-purpose I/O types .......................................................................................................37

Annex D (informative) User needs, features and requirements not included .......................................................38

Bibliography .............................................................................................................................................................................................................................39

iv PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/TS 20684-2:2021(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 204, Intelligent transport systems.

A list of all parts in the ISO 20684 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.
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ISO/TS 20684-2:2021(E)
Introduction
0.1 Background

The need for standardized communication with ITS field devices is growing around the world. Several

countries have adopted SNMP-based field device communication standards.

There is a growing view and empirical evidence that standardizing this activity will result in improved

ITS performance, reduced cost, reduced deployment time, and improved maintainability. The

ISO 20684 series extends ISO 15784-2 by defining the management information necessary to monitor,

configure and control features of field devices. The data elements in all parts of the ISO 20684 series

may be used with any protocol, but were designed with an expectation that they would be used with

one of the ISO 15784-2 protocols.

By using this approach, agencies can specify open procurements and systems can be expanded

geographically in an open and non-proprietary manner which reduces costs, speeds up deployment and

simplifies integration.
0.2 Overview

SNMP is a collection of well thought-out and well-proven concepts and principles. SNMP employs the

sound principles of abstraction and standardization. This has led to SNMP being widely accepted as the

prime choice for communication between management systems and devices on the Internet and other

communications networks.

The original implementation of SNMP was used to manage network devices such as routers and

switches. Since then, the use of SNMP has grown into many areas of application on the Internet and has

also been used successfully over various serial communications networks.

This document defines management information for ITS field devices following the SNMP conventions.

0.3 Document approach and layout
This document defines:
a) Conformance tables for this document (Clause 5);

b) User needs that are deemed to be common to many types of field devices (Clause 5);

c) Requirements for implementing the identified user needs, organized by major feature (Clause 6);

d) Design elements that are to be used in implementing the requirements (Clause 7);

e) The management information base (MIB) for the features defined by this document (Annex A);

f) A requirements traceability table that traces requirements to the design elements (Annex B);

g) Encoding examples (Annex C).

In addition, a simplified version of the conformance table and the MIBs are available electronically at

https:// standards .iso .org/ iso/ 20684/ -2.
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TECHNICAL SPECIFICATION ISO/TS 20684-2:2021(E)
Intelligent transport systems — Roadside modules SNMP
data interface —
Part 2:
Generalized field device basic management
1 Scope

Field devices are a key component in intelligent transport systems (ITS). Field devices include traffic

signals, message signs, weather stations, traffic sensors, roadside equipment for connected ITS (C-ITS)

environments, etc.

Field devices often need to exchange information with other external entities (managers). Field devices

can be quite complex necessitating the standardization of many data concepts for exchange. As such,

the ISO 20684 series is divided several individual parts.

This part of the ISO 20684 series identifies basic user needs for the management of virtually any field

device and traces these needs to interoperable designs. This includes the ability to identify the device,

its capabilities, and its status.
NOTE This document is similar to portions of NTCIP 1103 v03 and NTCIP 1201 v03.

ISO 20684-1 provides additional details about how the ISO 20684 series relates to the overall ITS

architecture.
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 20684-1:— , Intelligent transport systems — Roadside modules SNMP data interface — Part 1:

Overview
IETF RFC 2578, Structure of Management Information Version 2 (SMIv2), April 1999
IETF RFC 2579, Textual Conventions for SMIv2, April 1999.
IETF RFC 2580, Conformance Statements for SMIv2, April 1999.

IETF RFC 3411, An Architecture for Describing Simple Network Management Protocol (SNMP) Management

Frameworks, December 2002

IETF RFC 3418, Management Information Base (MIB) for the Simple Network Management Protocol

(SNMP), December 2002
IETF RFC 6933, Entity MIB (Version 4), May 2013
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 20684-1 apply.

1) Under preparation. Stage at the time of publication: ISO/FDIS 20684:2021.
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ISO/TS 20684-2:2021(E)

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/
4 Symbols and abbreviated terms
AC alternating current
C-ITS connected intelligent transport systems
I/O input/output
IEC International Electrotechnical Commission
IETF Internet Engineering Task Force
ISO International Organization for Standardization
ITS intelligent transport systems
MIB management information base
NTCIP national transportation communications for ITS protocol
RFC request for comments
RTM requirements traceability matrix
SNMP simple network management protocol
5 Conformance

This conformance section follows the rules defined in ISO 20684-1. Table 1 traces each user need to a

set of software features. Table 2 traces each feature to a set of requirements. Table 3 defines terms that

are used as predicates in the conformance codes listed in Tables 1 and 2. For a full understanding of

these tables and codes, see ISO 20684-1.
Table 1 — User need and feature conformance
Conform-
Need Requirement
ance
7.1: Monitor the field device M
8.1: Field device requirements M
8.3: Cabinet M
7.2: Monitor and control single-value inputs and outputs O
8.2: General-purpose I/O M
7.3.1: Monitor cabinet doors O
8.2: General-purpose I/O M
8.4: Cabinet doors M
7.3.2: Monitor and control cabinet fans O
8.2: General-purpose I/O M
8.5: Cabinet fans M
7.3.3: Monitor and control cabinet heaters O
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ISO/TS 20684-2:2021(E)
Table 1 (continued)
Conform-
Need Requirement
ance
8.2: General-purpose I/O M
8.6: Cabinet heaters M
7.3.4: Monitor cabinet humidity O
8.2: General-purpose I/O M
8.7: Cabinet humidity M
7.3.5: Monitor cabinet temperature O
8.2: General-purpose I/O M
8.8: Cabinet temperature M
7.3.6: Monitor cabinet mains power O.1 (1..*)
8.2: General-purpose I/O M
8.9: Cabinet mains power M
7.3.7: Monitor cabinet battery power O.1 (1..*)
8.2: General-purpose I/O M
8.10: Cabinet battery M
7.3.8: Monitor cabinet generator power O.1 (1..*)
8.2: General-purpose I/O M
8.11: Cabinet generator M
7.3.9: Monitor cabinet solar power O.1 (1..*)
8.2: General-purpose I/O M
8.12: Cabinet solar power M
7.3.10: Monitor cabinet wind power O.1 (1..*)
8.2: General-purpose I/O M
8.13: Cabinet wind power M

Annex D provides additional user needs that were considered but not included in this document.

Table 2 traces each feature to a set of requirements and defines under what conditions those

requirements could be mandatory in order to claim conformance to this document.
Table 2 — Requirement conformance
Feature Requirement Conformance
8.1: Field device requirements
8.1.2.1: Discover basic capabilities of the field device M
8.1.2.2: Discover SNMP capabilities of the field device M
8.1.2.3: Configure the field device's identity M
8.1.2.4: Identify the field device M
8.1.2.5: Identify the SNMP engine M
8.1.2.6: Monitor the field device configuration identifier M
8.1.2.7: Monitor controller operation M
8.1.2.8: Monitor controller up time M
8.1.2.9: Monitor watchdog failure count M
8.1.2.10: Reset the controller M
8.1.3.1: Field device performance requirements M
8.1.3.2: Support maximum message size M
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ISO/TS 20684-2:2021(E)
Table 2 (continued)
Feature Requirement Conformance
8.1.3.3: Support changeable memory O.2 (1..*)
8.1.3.4: Support volatile memory O.2 (1..*)
8.1.4.1: Control access M
8.1.4.2: Coordinate multiple managers M
8.2: General-purpose I/O
8.2.2.1: Discover general-purpose I/O capabilities M
8.2.2.2: Configure general-purpose I/O M
8.2.2.3: Retrieve configuration of general-purpose I/O M
input: M;
8.2.2.4: Monitor value from general-purpose I/O port
bi-directional: M
8.2.2.5: Monitor status of general-purpose I/O port M
8.2.2.6: Monitor status of general-purpose I/O type M
output: M;
8.2.2.7: Control output value of general-purpose I/O port
bi-directional: M
output: M;
8.2.2.8: Confirm output setting for general-purpose I/O port
bi-directio
...

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