IEC 61375-2-3:2015

IEC 61375-2-3 ®
Edition 1.0 2015-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electronic railway equipment – Train communication network (TCN) –
Part 2-3: TCN communication profile

Matériel électronique ferroviaire – Réseau embarqué de train (TCN) –
Partie 2-3: Profil de communication TCN

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IEC 61375-2-3 ®
Edition 1.0 2015-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electronic railway equipment – Train communication network (TCN) –

Part 2-3: TCN communication profile

Matériel électronique ferroviaire – Réseau embarqué de train (TCN) –

Partie 2-3: Profil de communication TCN

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 45.060.01 ISBN 978-2-8322-6098-2

– 2 – IEC 61375-2-3:2015  IEC 2015
CONTENTS
FOREWORD . 13
INTRODUCTION . 15
1 Scope . 16
2 Normative references . 17
3 Terms, definitions, abbreviations, acronyms, and conventions . 18
3.1 Terms and definitions . 18
3.2 Abbreviations and acronyms . 26
3.3 Conventions . 28
3.3.1 Base of numeric values . 28
3.3.2 Character strings and citations . 28
3.3.3 Naming conventions . 29
3.3.4 Diagram conventions . 29
3.3.5 Annotation of data structures . 29
4 Architecture . 31
4.1 General . 31
4.2 Physical train architecture (system breakdown). 31
4.2.1 General . 31
4.2.2 Train network architectures . 31
4.2.3 Closed Trains . 35
4.2.4 Directions . 36
4.2.5 Consist and vehicle basic properties . 37
4.3 Logical Train Architecture (Functional Breakdown) . 38
4.3.1 General . 38
4.3.2 Service classification . 38
4.3.3 Operational Services Overview . 39
4.3.4 Service Provider . 40
5 Common ETB framework . 40
5.1 General . 40
5.1.1 Overview . 40
5.1.2 Interoperability . 40
5.2 CSTINFO telegram . 41
5.2.1 General . 41
5.2.2 Closed train support (Option) . 41
5.2.3 Protocol . 41
5.2.4 CSTINFO classes . 41
5.2.5 CSTINFO Notification Message . 42
5.2.6 CSTINFO Request . 43
5.3 Train topology database . 45
5.3.1 General . 45
5.3.2 Computation of the TTDB . 47
5.3.3 Data structure . 52
5.3.4 Train Topology Database for multiple ETBs (Option) . 60
5.4 Service Addressing . 62
5.4.1 General . 62
5.4.2 TCN Domain Name System (TCN-DNS) . 63
5.4.3 TCN Domain Names . 64
5.4.4 TCN-URI Scheme . 64

5.4.5 Mapping TCN-URI to IP address . 71
5.4.6 Support of other URI schemas . 74
5.5 TCN-DNS Server . 74
5.5.1 General . 74
5.5.2 Architecture . 75
5.5.3 Functional address resolution . 75
5.5.4 Protocol . 77
5.5.5 Multiple ETBs . 78
5.6 Data exchange . 78
5.6.1 General . 78
5.6.2 Operational network communication . 78
5.6.3 OMTS network communication . 79
5.6.4 Quality of Service (QoS) . 79
5.7 Service discovery . 80
5.8 Train Info Service . 80
6 Services of the communication profile – ETB Control Service . 80
6.1 General . 80
6.2 Communication model . 80
6.3 ECSP Supervision . 81
6.4 ECSP Interconnection . 81
6.4.1 General . 81
6.4.2 ETBCTRL telegram exchange selection . 81
6.4.3 ETBCTRL telegram transmission . 82
6.4.4 Structure of the ETBCTRL telegram . 82
6.4.5 Operational train directory computation process . 85
6.5 Function “Leading” . 87
6.5.1 General . 87
6.5.2 Function primitives . 88
6.5.3 ECSP to ECSP protocol . 89
6.6 Function Confirmation/Correction . 93
6.6.1 General . 93
6.6.2 Function primitives . 93
6.6.3 ECSP to ECSP protocol . 95
6.6.4 State diagram . 98
6.6.5 ECSC Failure . 100
6.7 Computation of the operational train directory . 100
6.7.1 General . 100
6.7.2 Action setCorrInfo . 101
6.7.3 Action computeOpTrnDir . 104
6.8 Function Sleep Mode (Option) . 107
6.8.1 General . 107
6.8.2 Sleep Mode Use Case (informal) . 107
6.8.3 Exclusivity . 109
6.8.4 Function primitives . 109
6.8.5 ECSP to ECSP protocol . 111
Annex A (normative) Train Real-Time Data Protocol (TRDP) . 115
A.1 General . 115
A.2 Lower Layers . 115
A.2.1 Data link layer . 115

– 4 – IEC 61375-2-3:2015  IEC 2015
A.2.2 Network Layer . 115
A.2.3 Transport Layer . 116
A.3 TRDP FCS Computation . 117
A.4 Interaction between TRDP user and TRDP Layer . 119
A.5 Communication Identifier (ComId) . 119
A.6 Process Data . 121
A.6.1 Communication model . 121
A.6.2 Roles . 121
A.6.3 Communication pattern . 121
A.6.4 Addressing. 126
A.6.5 PD-PDU . 126
A.6.6 Interaction between application and TRDP protocol layer . 129
A.6.7 Topography counter check . 136
A.6.8 State Machine . 137
A.7 Message Data . 141
A.7.1 Communication model . 141
A.7.2 Roles . 142
A.7.3 Communication pattern . 142
A.7.4 Addressing. 143
A.7.5 MD-PDU . 143
A.7.6 Interaction between application and TRDP layer . 147
A.7.7 Topography counter check . 151
A.7.8 MD protocol state machine . 152
A.7.9 TCP Connection Handling . 161
A.8 Message data echo server (option) . 162
Annex B (normative) Safe Data Transmission (SDTv2) . 163
B.1 General . 163
B.2 Overview of SDTv2 (informal) . 163
B.3 Safety functional requirements . 164
B.4 Safety measures . 164
B.5 Operational states of the SDTv2 channel . 165
B.6 Data presentation . 166
B.7 SC-32 . 166
B.8 SID . 169
B.9 Vital Data Packet . 170
B.10 Exclusivity . 171
B.11 Configuration time parameters. 171
B.12 Safe data source (SDSRC) . 171
B.12.1 General . 171
B.12.2 Safe Data Preparation (Application) . 171
B.12.3 Safe data sending . 172
B.13 Safe data sink (SDSINK) . 173
B.13.1 General . 173
B.13.2 Definitions . 174
B.13.3 SDSINK States . 175
B.13.4 VDP Sampling. 176
B.13.5 VDP Integrity Check . 177
B.13.6 Sink time supervision . 178
B.13.7 Guard time check . 178

B.13.8 Latency monitoring . 179
B.13.9 Channel monitoring . 181
B.13.10 SDTv2 Application Interface . 182
B.13.11 Change of operational train composition . 183
B.14 Diagnosis and statistics . 183
B.15 Safe data transmission over MVB (informative) . 184
B.15.1 General . 184
B.15.2 MVB-VDP . 184
B.15.3 SDTV2 protocol deviations for MVB . 185
B.16 SDTv2 with TRDP message data . 186
Annex C (informative) Train Real-Time Data Protocol Configuration (TRDP) . 187
C.1 General . 187
C.2 Device Parameters . 188
C.3 Device Configuration Parameters . 189
C.4 Bus Interface List . 189
C.4.1 General . 189
C.4.2 Bus Interface Configuration . 190
C.5 Mapped Device Parameters . 201
C.5.1 General . 201
C.5.2 Mapped Bus Interface Parameters . 202
C.6 Communication Parameters (ComPar) . 204
C.6.1 General . 204
C.6.2 Default Communication Parameters . 205
C.7 DataSet Parameters . 205
C.7.1 General . 205
C.7.2 DataSet Element . 207
C.7.3 Examples of DataSets . 209
Annex D (informative) Access to End Device (ED) statistics . 213
D.1 General . 213
D.2 Structures . 213
D.2.1 General . 213
D.2.2 tlc_getSubsStatistics . 215
D.2.3 tlc_getPubStatistics. 215
D.2.4 tlc_getUdpListStatistics, tlc_getTcpListStatistics . 215
D.2.5 tlc_getRedStatistics . 216
D.3 ED interface for statistic data access . 216
D.3.1 General . 216
D.3.2 TRDP interface . 216
Annex E (informative) Service interface . 218
E.1 General . 218
E.2 Service provider . 219
E.2.1 Proxies . 219
E.2.2 Performance . 219
E.3 ECSP interface . 219
E.3.1 General . 219
E.3.2 ECSP control telegram . 219
E.3.3 ECSP status telegram . 221
E.3.4 ECSP Confirmation/Correction Request . 224
E.4 TTDB manager interface . 227

– 6 – IEC 61375-2-3:2015  IEC 2015
E.4.1 General . 227
E.4.2 TTDB status information . 227
E.4.3 TTDB notification . 228
E.4.4 TTDB information – train directory . 228
E.4.5 TTDB information – static consist information . 229
E.4.6 TTDB information – train network directory information . 230
E.4.7 Operational train directory information . 231
E.4.8 Read TTDB . 232
E.5 DNS server interface . 233
E.5.1 DNS standard interface . 233
E.5.2 DNS TCN interface . 233
E.6 ETBN control interface . 239
E.6.1 General . 239
E.6.2 ETBN control and status data . 240
E.6.3 ETBN train network directory . 243
Annex F (normative) Communication profile conformance test guideline . 244
F.1 General . 244
F.2 Scope of conformance test . 244
F.3 Conformance test overview . 245
F.4 Test laboratory . 245
F.4.1 General . 245
F.4.2 Tasks . 245
F.5 Guideline for writing conformance test specifications . 246
F.5.1 Overview of the main components . 246
F.5.2 Protocol Implementation Conformance Statement (PICS) . 246
F.5.3 Abstract test architecture . 247
F.5.4 Protocol Implementation eXtra Information for Testing (PIXIT) . 247
F.5.5 Test suite structure . 247
F.6 Abstract test architecture (option) . 247
F.6.1 General . 247
F.6.2 Test architecture with one ETB. 248
F.6.3 Test architecture for multiple ETB . 248
F.6.4 Set-up for automatic test . 248
F.7 Test of conformity to the common ETB framework . 249
F.7.1 General . 249
F.7.2 Test of CSTINFO telegram . 249
F.7.3 Test of TTDB . 249
F.7.4 Test of service addressing and TCN-DNS server . 249
F.7.5 Test of data exchange . 250
F.7.6 Test of service discovery . 251
F.7.7 Test of train info service . 251
F.8 ETB Control Service conformity test . 251
F.8.1 General . 251
F.8.2 Test control interface for the test of ETB control services . 251
F.9 Echo function . 259
F.9.1 General . 259
F.9.2 TRDP echo test . 259
F.9.3 Reverse-Echo test . 260
F.10 Statement of conformity . 261

Annex G (informative) SNMP Management Information Base (MIB) . 263
G.1 General . 263
G.2 TTDB-MIB . 263
G.3 TRDP-MIB. 268
Bibliography . 279

Figure 1 – IEC 61375-2-3 as connecting element between train backbone and
application . 17
Figure 2 – Train structure in accordance to IEC 61375-1 (example) . 31
Figure 3 – Train structure seen from viewpoint of the communication profile (example) . 31
Figure 4 – Train network (example) . 32
Figure 5 – Possible couplings of operational network and multimedia network . 33
Figure 6 – Gateway between operational network and multimedia network (example) . 34
Figure 7 – Example: three coupled Consists . 35
Figure 8 – Example: Closed Train . 36
Figure 9 – Service classification . 39
Figure 10 – CSTINFO notification data . 43
Figure 11 – CSTINFOCTRL telegram . 45
Figure 12 – TTDB management block diagram . 45
Figure 13 – TTDB Content . 46
Figure 14 – TTDB computation block diagram . 47
Figure 15 – Train directory computation state diagram . 48
Figure 16 – TTDB class diagram (example) . 52
Figure 17 – TTDB adoption (in this example shown for the first consist) . 61
Figure 18 – TCN-DNS name space with division into zones . 63
Figure 19 – TCN-URI Schema . 65
Figure 20 – Directions, orientations and numbers in train . 66
Figure 21 – TCN-URI resolving in a train . 75
Figure 22 – DNS protocol (case a without, case b with TTDB interrogation) . 78
Figure 23 – ETB control service model . 80
Figure 24 – ETBCTRL telegram exchange . 81
Figure 25 – ETBCTRL telegram . 82
Figure 26 – Operational train directory computation block diagram . 85
Figure 27 – ETBCTRL processing state diagram. 86
Figure 28 – Leading sequence diagram . 88
Figure 29 – Leading vehicle function state machine block diagram . 90
Figure 30 – State diagram of leading function . 91
Figure 31 – Confirmation sequence diagram . 94
Figure 32 – Confirmation/correction function state machine block diagram . 95
Figure 33 – Correction/confirmation protocol sequence chart (example) . 97
Figure 34 – Unconfirm protocol sequence chart (example) . 98
Figure 35 – Confirmation/correction state diagram . 99
Figure 36 – Action “setCorrInfo” block diagram . 101
Figure 37 – Train composition consistency check examples . 104

– 8 – IEC 61375-2-3:2015  IEC 2015
Figure 38 – Computation of the operational train directory . 105
Figure 39 – computeOpTrnDir state chart . 106
Figure 40 – Use case “sleep mode” state diagram . 109
Figure 41 – Sleep control sequence diagram . 110
Figure 42 – Sleep control function state machine block diagram . 111
Figure 43 – Sleep request protocol sequence chart (example) . 112
Figure 44 – Sleep control state diagram . 113
Figure A.1 – Overview of the protocol stack . 115
Figure A.2 – FCS Computation . 117
Figure A.3 – FCS Table . 118
Figure A.4 – TRDP service model . 119
Figure A.5 – PD push pattern (point to point) . 122
Figure A.6 – PD push pattern (point to multipoint) . 122
Figure A.7 – PD pull pattern (point to point, sink knows source) . 123
Figure A.8 – PD pull pattern (multipoint to point, sink does not know source) . 124
Figure A.9 – PD pull pattern (point to multipoint, sink knows source) . 125
Figure A.10 – PD pull pattern (multipoint to multipoint, sink does not know source) . 126
Figure A.11 – PD-PDU . 127
Figure A.12 – Interaction sequence chart for PD pull pattern . 134
Figure A.13 – Interaction sequence chart for PD push pattern . 135
Figure A.14 – Interaction sequence chart for redundant PD handling. 136
Figure A.15 – PD State diagram publisher . 137
Figure A.16 – PD State diagram requester . 139
Figure A.17 – PD State diagram subscriber . 140
Figure A.18 – Message data transfer options . 142
Figure A.19 – MD-PDU . 144
Figure A.20 – Interaction sequence chart . 151
Figure A.21 – TRDP layer MD caller state chart . 154
Figure A.22 – TRDP layer MD replier state chart . 157
Figure A.23 – TRDP Layer MD telegram reception . 160
Figure B.1 – SDTV2 Channel . 163
Figure B.2 – SDTv2 Channel States . 166
Figure B.3 – SC-32 Computation .
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