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BS EN 61375-2-5:2015

BS EN 61375-2-5:2015

$215.11

Electronic railway equipment. Train communication network (TCN) – Ethernet train backbone

Published By Publication Date Number of Pages
BSI 2015 128
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This part of IEC 61375 defines Ethernet Train Backbone (ETB) requirements to fulfil open train data communication system based on Ethernet technology.

Respect of this standard ensures interoperability between local Consist subnets whatever Consist network technology (see IEC 61375-1 for more details).

All Consist network definitions should take into account this standard to preserve interoperability.

This standard may be additionally applicable to closed trains and multiple-unit trains when so agreed between purchaser and supplier.

PDF Catalog

PDF Pages PDF Title
8 English

CONTENTS
13 INTRODUCTION
14 1 Scope
2 Normative references
15 3 Terms, definitions, symbols, abbreviations and conventions
3.1 Terms and definitions
19 3.2 Symbols and abbreviations
21 3.3 Conventions
3.3.1 Base of numeric values
3.3.2 Naming conventions
3.3.3 State diagram conventions
3.3.4 Annotation of data structures
4 ETB physical layer
4.1 Train regions
22 4.2 Physical characteristics
4.2.1 General
4.2.2 Intra car physical layer
Figures

Figure 1 – ETB train regions
23 Tables

Table 1 – ETB Intra car physical layer interface (1 of 2)
24 4.2.3 Inter car physical layer
25 Table 2 – ETB Inter car physical layer interface (1 of 2)
27 Figure 2 – ETB Inter car at same potential
28 4.2.4 Inter Consist physical layer
Figure 3 – ETB Inter car not at the same potential
29 Table 3 – ETB Inter consist physical layer interface (1 of 2)
30 Figure 4 – ETB Consist reversing
31 4.3 Power over Ethernet (PoE)
Figure 5 – ETB Inter Consist segment
Figure 6 – ETBN PSE PoE use case
32 Figure 7 – ETBN PD PoE use case
Figure 8 – PoE in inter-Consist
33 4.4 ETB physical architecture and redundancy
4.4.1 General
4.4.2 Link aggregation architecture
Figure 9 – PoE PSE alternative A
Figure 10 – Redundant train backbone architecture
34 Figure 11 – Link aggregation model
35 4.4.3 Functions
Figure 12 – Link aggregation group
Figure 13 – Conversations over LAG
36 5 ETB data link layer
Table 4 – ETB Switch data link layer interface (1 of 2)
37 6 ETB network layer: IPv4 subnets definition
6.1 General
Table 5 – ETB OSI Network layer
38 6.2 IP mapping introduction
6.3 Topology
6.3.1 General
39 6.3.2 Closed train
Figure 14 – Hierarchical Consist topology
40 6.4 Network IP address map
6.4.1 Global IPv4 address space
6.4.2 Train subnet definition
Figure 15 – Closed train
Table 6 – Train subnet definition
41 Table 7 – Train subnet decomposition
42 Figure 16 – “Subnet Id” with single Consist Network
Figure 17 – “Subnet Id” with two single Consist Networks
43 Figure 18 – Multiple Consist Networks, without fault tolerance
Figure 19 – “Subnet Id” with ETBN redundancy
44 6.4.3 Train IP address map summary
Figure 20 – “Subnet Id” in multiple units with ETBN redundancy
Figure 21 – IP train address space summary
45 6.4.4 Train IP group addresses (multicast)
6.5 Particular hosts IP addresses
6.5.1 ETBN (Ethernet Train Backbone Node)
Table 8 – Train IP group addresses reserved range
46 6.5.2 Hosts on train subnet
Table 9 – ETBN ETB IP address
47 6.5.3 Host inside a closed train
Table 10 – Hosts IP on train subnet
49 6.6 Some use cases
Figure 22 – Relative addressing example
50 Figure 23 – Train composed of a single Consist Network
Figure 24 – Train composed of two single Consist Networks
51 Figure 25 – Train composed of single Consist Network with ETBN redundancy
Figure 26 – Train composed of two Consist Networks with ETBN redundancy
52 6.7 Dynamic IP routing management
6.7.1 Unicast routes
6.7.2 Multicast routes
Figure 27 – Train with two Consist Networks in single Consist
53 7 ETB Transport layer
54 8 ETB Train Inauguration: TTDP
8.1 Contents of this clause
8.2 Objectives and assumptions
8.2.1 Goals
Table 11 – Application ED common interface
55 8.2.2 Out of scope
8.2.3 Assumptions
Figure 28 – ETBN top node reference
56 8.3 ETBN settings
8.3.1 ETB switch port states
8.3.2 Node settings
Figure 29 – ETBN orientation capability
Table 12 – ETB switch port states
57 Figure 30 – ETB switch in passive bypass setting
Figure 31 – ETB switch in intermediate setting
58 8.4 General behaviour
8.5 ETBN Inauguration state diagram
8.5.1 General
Figure 32 – ETB switch in End Node Setting
59 8.5.2 Actions
Figure 33 – ETBN Inauguration state diagram
61 8.5.3 Transitions
62 8.6 ETBN peers discovery
8.6.1 Internal peers detection
8.6.2 External peers detection
63 8.6.3 Switch port states handling
8.6.4 ETB lines statuses
Figure 34 – Switch port state diagram
64 Figure 35 – ETBN physical line state machine
65 8.7 TTDP messages description
8.7.1 General
8.7.2 Convention
8.7.3 TTDP frame tagging
8.7.4 Transport and addressing
66 8.7.5 TTDP HELLO frame
Figure 36 – TTDP HELLO frame LLDPDU structure
Figure 37 – LLDP organizationally TLV structure
Table 13 – TTDP destination MAC addresses
70 8.7.6 TTDP TOPOLOGY frame
Figure 38 – TTDP HELLO frame structure
Figure 39 – TTDP specific HELLO TLV structure
76 8.8 TTDP data structures
8.8.1 Connectivity Vector
Figure 41 – TTDP TOPOLOGY specific ETB TLV structure
Figure 42 – TTDP TOPOLOGY specific CN TLV structure
77 8.8.2 ETBN Vector
8.8.3 Connectivity Table
Table 14 – Connectivity Vector
Table 15 – Connectivity Vector Fields
Table 16 – ETBN Vector
Table 17 – ETBN Vector Fields
78 8.8.4 Connectivity Table CRC
Table 18 – Connectivity Table
Table 19 – Connectivity Table fields
80 8.8.5 Train network directory
Table 20 – Train network directory
Table 21 – Train network directory fields
81 Figure 43 – Train composition for TNDir example
82 8.8.6 Train network directory CRC (Topology Counter)
8.8.7 Corrected topology
Table 22 – Train network directory (example)
83 8.9 TTDP frames timing
8.9.1 TTDP HELLO
84 Figure 44 – TTDP HELLO normal mode and recovery timing
85 8.9.2 TTDP TOPOLOGY
Figure 45 – TTDP HELLO failure timing
86 Figure 46 – TTDP TOPOLOGY frames handling
87 8.10 Inauguration Train Application interface
8.11 Degraded modes
8.11.1 Late insertion ETBN
88 8.11.2 Losing ETBN
8.11.3 End ETBN failure and partial topology counter
89 8.12 Some discovery timing
8.12.1 ETBN wakeup
Figure 47 – TTDP ETBNs wake up timing
90 8.12.2 ETBN failure
Figure 48 – TTDP ETBN failure timing
91 8.12.3 Consist coupling
Figure 49 – TTDP Consist coupling timing
92 9 ETB ETBN redundancy
Figure 50 – Example of ETBN IP routing table without redundancy
Figure 51 – Example of ETBN IP routing table with redundancy
93 10 ETB physical train naming convention (optional)
10.1 General
10.2 ETB Train domain
94 10.3 Hostname
Figure 52 – ETB train domain defintion
95 11 ETB Quality of Service
11.1 Contents of this clause
11.2 Frame forwarding
11.2.1 ETBN switching rate
11.2.2 No Head-of-Line blocking
11.2.3 Switching priorities
Table 23 – DSCP field mapping
96 11.2.4 Switching queuing scheme
11.3 Priority of Inauguration frames
11.4 ETB ingress rate limiting
11.5 ETB egress rate shaping
11.6 ETB data classes
Table 24 – ETB Switching Priorities
97 12 ETB Management and monitoring
13 ETB Application interface
13.1 Contents of this clause
13.2 Abstract communication model
98 13.3 ETB Process Data and Message Data protocols
13.4 ETB protocol transparency
13.5 ETBN interfaces
13.5.1 Application
Figure 53 – Abstract communication model for ETB communication
99 13.5.2 Maintenance and monitoring
Table 25 – Train Topology Discovery Object
100 14 ETB conformity statement
101 Annex A (normative)Summary of ETB sizing parameters
Table A.1 – ETB sizing parameters
102 Annex B (normative)Physical topology building algorithm
Figure B.1 – Physical topology building
105 Annex C (normative)TTDP MIB definition
107 Figure C.1 – TTDP MIB tree view
125 Bibliography

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