ISO/TS 26048-1:2025

Technical
Specification
ISO/TS 26048-1
First edition
Intelligent transport systems —
2025-07
Field device Simple Network
Management Protocol (SNMP) data
interface —
Part 1:
Global objects
Systèmes de transports intelligents — Interface de données
Simple Network Management Protocol (SNMP) pour les
dispositifs de terrain —
Partie 1: objets globaux
Reference number
© ISO 2025
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Contents Page
Foreword .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 5
5 Conventions and architecture . 6
5.1 ISO maintenance portal .6
5.2 MIB files .6
5.2.1 MIB format .6
5.2.2 MIB access .7
5.2.3 MIB filenames .7
5.3 ASN.1 .7
5.4 Conformance .7
5.5 SNMP terminology .7
5.6 Architecture .8
5.6.1 ITS services .8
5.6.2 Functional view of interface .8
5.6.3 Physical view .8
5.6.4 Communications view .8
5.7 Constraints.9
5.7.1 Table design constraint .9
5.7.2 Access constraints .10
5.8 Outline .10
5.9 Requirements pattern .10
6 User needs .12
6.1 Authenticate users . 12
6.2 Control access to data . 12
6.3 Monitor failed access to the field device . 12
6.4 Manage the field device . 12
6.5 Monitor field device components . 12
6.5.1 Monitor ambient environment . 12
6.5.2 Monitor field device enclosure . 13
6.5.3 Manage enclosure climate control components . 13
6.5.4 Monitor field device power .14
6.5.5 Manage auxiliary ports .14
6.6 Receive notification of triggers firing .14
6.7 Manage device-specific notifications . 15
6.8 Log system events . 15
6.9 Log user-defined data snapshots . 15
6.10 Record a series of data snapshots . 15
6.11 Issue trigger-based commands . 15
6.12 Configure a complex device .16
6.13 Efficient exchange of data .16
6.14 Future user needs .16
6.14.1 Software update .16
6.14.2 Start-up configuration .16
6.14.3 Configuration set management .16
6.14.4 Sequence of constructs within dynamic objects .16
7 High-level design . 17
7.1 Authenticate users design overview .17
7.2 Control access to data design overview .17
7.3 Monitor failed access to the field device .18
7.4 Manage the field device design overview .18

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7.5 Monitor field device components .18
7.6 Receive notification of triggers firing design overview .18
7.6.1 General .18
7.6.2 Triggers .19
7.6.3 Action selection .19
7.6.4 Notification factory . 20
7.6.5 Notification channel . 20
7.7 Manage device-specific notifications design overview . 20
7.8 Log system events design overview . 20
7.9 Log user-defined data snapshots design overview . 20
7.10 Record a series of data snapshots design overview .21
7.11 Issue trigger-based commands design overview . 22
7.12 Configure a complex device design overview . 23
7.13 Efficient exchange of data design overview . 23
7.14 Triggers . 23
7.14.1 General . 23
7.14.2 Scheduled triggers design overview . 23
7.14.3 Day plan triggers design overview .24
7.14.4 Condition-based triggers design overview . 25
8 Requirements .26
8.1 Action feature . 26
8.1.1 Action feature definition . 26
8.1.2 Action feature data exchange requirements .27
8.1.3 Action feature functional requirements . 28
8.1.4 Action feature performance requirement . 28
8.2 Clock feature . 28
8.2.1 UTC Clock . 28
8.2.2 Local clock . 30
8.2.3 Daylight saving time. 30
8.3 Command feature .31
8.3.1 Command feature definition .31
8.3.2 Command feature data exchange requirements . .31
8.3.3 Command feature capability requirements .32
8.3.4 Command feature functional requirements .32
8.4 Conditional trigger feature . 33
8.4.1 Conditional trigger feature definition . 33
8.4.2 Conditional trigger feature data exchange requirements . 33
8.4.3 Conditional trigger feature functional requirements . 34
8.4.4 Conditional trigger feature capability requirements . 34
8.5 Controller feature . 39
8.5.1 Controller feature definition . 39
8.5.2 Controller feature data exchange requirements . 39
8.5.3 Controller feature capability requirements .41
8.5.4 Controller performance requirements .42
8.6 Day plan feature .42
8.6.1 Day plan feature definition .42
8.6.2 Day plan feature data exchange requirements .42
8.6.3 Day plan feature functional requirements . 44
8.7 Dynamic object feature . 44
8.7.1 Dynamic object feature definition . 44
8.7.2 Dynamic object feature data exchange requirements . 44
8.7.3 Dynamic object feature capability requirements .45
8.7.4 Dynamic object feature functional requirement . 46
8.7.5 Dynamic object feature performance requirement . 46
8.8 Field device feature . 46
8.8.1 Field device definition . 46
8.8.2 General field device features .47
8.8.3 Ambient air temperature . 48

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8.8.4 Ambient light . 48
8.8.5 Ambient relative humidity . 49
8.8.6 Auxiliary bi-directional port . 49
8.8.7 Auxiliary input port . 49
8.8.8 Auxiliary output port . 49
8.8.9 Field device air conditioner . 49
8.8.10 Field device battery . 50
8.8.11 Field device dehumidifier . 50
8.8.12 Field device doors .51
8.8.13 Field device fans.51
8.8.14 Field device generator .51
8.8.15 Field device heaters .52
8.8.16 Field device humidity .52
8.8.17 Field device mains power .52
8.8.18 Field device power supply . 53
8.8.19 Field device processor temperature . 53
8.8.20 Field device solar power . 53
8.8.21 Field device temperature . 54
8.8.22 Field device thermostat . 54
8.8.23 Field device wind power . 54
8.9 File feature . 55
8.9.1 File feature definition . 55
8.9.2 File feature data exchange requirements . 55
8.10 Logging feature . 55
8.10.1 Logging feature definition . 55
8.10.2 Logging feature data exchange requirements . 55
8.10.3 Logging feature functional requirements .57
8.10.4 Logging feature capability requirements .57
8.11 Notification feature .57
8.11.1 Notification channel .57
8.11.2 Notification factory . 65
8.11.3 Independent notification .67
8.11.4 Notification aggregator . 68
8.12 Owner feature .70
8.12.1 Owner feature definition .70
8.12.2 Owner feature data exchange requirements .70
8.13 Recording feature .71
8.13.1 Recording feature definition .71
8.13.2 Recording feature data exchange requirements .71
8.13.3 Recording feature capability requirements. 73
8.13.4 Recording feature functional requirement . 73
8.14 Scheduled trigger feature . 73
8.14.1 Scheduled trigger feature definition . 73
8.14.2 Scheduled trigger feature data exchange requirements . 73
8.14.3 Scheduled trigger feature functional requirements .74
8.14.4 Scheduled trigger feature capability requirements .74
8.15 Secure communications feature .74
8.15.1 Secure communications feature definition .74
8.15.2 Secure communications protocol requirements . 75
8.15.3 Secure communications conformance requirements . 75
8.16 SNMP target feature . 75
8.16.1 SNMP target feature definition . 75
8.16.2 SNMP target feature data exchange requirements . 75
8.16.3 SNMP target feature capability requirements.76
8.17 Start-up feature . .76
8.17.1 Start-up feature definition . . .76
8.17.2 Start-up feature data exchange requirements . 77
8.18 Supplemental roadside sensors and actuators (SRSA) feature . 77
8.18.1 SRSA feature definition . 77

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8.18.2 SRSA feature data exchange requirements . 77
8.18.3 SRSA feature capability requirements . 78
8.18.4 SRSA feature performance requirements. 79
8.18.5 SRSA feature supplemental requirements . 79
8.19 System log feature . 79
8.19.1 System log feature definition . 79
8.19.2 System log feature data exchange requirements . 80
8.19.3 System log feature capability requirements . 80
8.20 Transaction feature . 80
8.20.1 Transaction feature definition . 80
8.20.2 Transaction feature data exchange requirements . 81
8.20.3 Transaction feature functional requirements . 81
8.21 View-based access control model (VACM) feature . 81
8.21.1 VACM feature definition . . 81
8.21.2 VACM feature data exchange requirements . 81
9 Dialogues .82
9.1 General dialogue rules . 82
9.1.1 Management station initiated . 82
9.1.2 SNMP agent performance requirements . 82
9.1.3 Generic and custom dialogues . 82
9.2 Generic dialogues . 83
9.2.1 Get elemental data . 83
9.2.2 Set elemental data . 83
9.2.3 Walk data . 83
9.2.4 Get bulk data . 83
9.2.5 Get tabular data . . 83
9.2.6 Set tabular data . 83
9.2.7 Get data column . 84
9.2.8 Get counters . 84
9.2.9 Get data from dynamic table entry . 84
9.2.10 Get row status of dynamic table entry . 84
9.2.11 Configure entry of a dynamic table . 85
9.2.12 Configure entry of a dynamic table with TestAndIncr. 86
9.2.13 Toggle active status of a dynamic table entry . 86
9.2.14 Delete entry from a dynamic table . 87
9.2.15 Send a notification . 87
9.2.16 Retrieve dynamic object data . 87
9.2.17 Set dynamic object data . 87
9.2.18 Retrieve a file . . 88
9.2.19 Generate a file . 88
10 Security .88
10.1 Vulnerabilities . 88
10.2 Authentication and access control . 88
10.3 Encryption . 89
10.4 Security recommendations . 89
Annex A (informative) Conformance .90
Annex B (informative) Management information base (MIB) summary.93
Bibliography .95

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Foreword
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Technical Specification ISO/TS 26048-1:2025(en)
Intelligent transport systems — Field device Simple Network
Management Protocol (SNMP) data interface —
Part 1:
Global objects
1 Scope
Field devices are a key component in intelligent transport systems (ITS). Field devices include traffic signals,
message signs, weathe
...