SIST EN 61375-2-2:2012
(Main)Electronic railway equipment - Train communication network - Part 2-2: WTB - Wire Train Bus conformance testing (IEC 61375-2-2:2012)
Electronic railway equipment - Train communication network - Part 2-2: WTB - Wire Train Bus conformance testing (IEC 61375-2-2:2012)
IEC 61375-2-2:2012 applies to all equipment and devices implemented according to IEC 61375-2-1, i.e. it covers the procedures to be applied to such equipment and devices when the conformance should be proven. The applicability of this standard to a TCN implementation allows for individual conformance checking of the implementation itself and is a pre-requisite for further interoperability checking between different TCN implementations.
Elektronische Betriebsmittel für Bahnen – Zug-Kommunikations-Netzwerk (TCN) - Teil 2-2: Wire Train Bus Konformitätsprüfung (IEC 61375-2-2:2012)
Matériel électronique ferroviaire - Réseau embarqué de train (TCN) - Partie 2-2: Bus de train filaire - Essais de conformité (CEI 61375-2-2:2012)
La CEI 61375-2-2:2012 s'applique à tous les équipements et dispositifs mis en place conformément à la CEI 61375-2-1. Elle concerne les modes opératoires à appliquer aux équipements et dispositifs dont il convient de démontrer la conformité. L'applicabilité de la présente norme à la mise en oeuvre d'un TCN permet de procéder à une vérification de conformité individuelle de la mise en oeuvre elle-même et constitue une condition préalable à un contrôle approfondi de l'interopérabilité des différentes mises en oeuvre du TCN.
Železniške elektronske naprave - Komunikacijsko omrežje vlaka - 2-2. del: Preskus skladnosti žičnega podatkovnega vodila vlaka WTB (IEC 61375-2-2:2012)
Ta del standarda IEC 61375 velja za vso opremo in naprave, ki se uporabljajo v skladu s standardom IEC 61375-2-1, tj. zajema postopke, ki jih je treba uporabljati za tako opremo in naprave v primeru dokazovanja skladnosti. Uporaba tega standarda za izvedbo komunikacijskega omrežja vlaka (TCN) omogoča posamezno preverjanje skladnosti same izvedbe in je pogoj za nadaljnje preverjanje interoperabilnosti med različnimi izvedbami komunikacijskega omrežja vlaka.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Elektronische Betriebsmittel für Bahnen – Zug-Kommunikations-Netzwerk (TCN) - Teil 2-2: Wire Train Bus Konformitätsprüfung (IEC 61375-2-2:2012)Matériel électronique ferroviaire - Réseau embarqué de train (TCN) - Partie 2-2: Bus de train filaire - Essais de conformité (CEI 61375-2-2:2012)Electronic railway equipment - Train communication network - Part 2-2: WTB - Wire Train Bus conformance testing (IEC 61375-2-2:2012)45.020Železniška tehnika na splošnoRailway engineering in generalICS:Ta slovenski standard je istoveten z:EN 61375-2-2:2012SIST EN 61375-2-2:2012en01-oktober-2012SIST EN 61375-2-2:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD EN 61375-2-2 NORME EUROPÉENNE
EUROPÄISCHE NORM August 2012
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61375-2-2:2012 E
ICS 45.060
English version
Electronic railway equipment -
Train communication network (TCN) -
Part 2-2: Wire Train Bus conformance testing (IEC 61375-2-2:2012)
Matériel électronique ferroviaire -
Réseau embarqué de train (TCN) -
Partie 2-2: Bus de Train Filaire -
Essais de conformité (CEI 61375-2-2:2012)
Elektronische Betriebsmittel für Bahnen - Zug-Kommunikations-Netzwerk (TCN) - Teil 2-2: Wire Train Bus Konformitätsprüfung (IEC 61375-2-2:2012)
This European Standard was approved by CENELEC on 2012-07-26. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Foreword The text of document 9/1643/FDIS, future edition 1 of IEC 61375-2-2, prepared by IEC/TC 9 "Electrical equipment and systems for railways" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61375-2-2:2012.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-04-26 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-07-26
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this document.
Endorsement notice The text of the International Standard IEC 61375-2-2:2012 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 61375-1 NOTE
Harmonized as EN 61375-1.
- 3 - EN 61375-2-2:2012 Annex ZA (normative)
Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60571 - Electronic equipment used on rail vehicles - -
IEC 60807 Series Rectangular connectors for frequencies below 3 MHz
- -
IEC 61375-2-1 - Electronic railway equipment - Train communication network (TCN) -
Part 2-1: Wire Train Bus (WTB) EN 61375-2-1 -
ISO/IEC 7498 Series Information technology - Open Systems Interconnection - Basic Reference Model - -
ISO/IEC 9646-1 1994 Information technology - Open Systems Interconnection - Conformance testing methodology and framework -
Part 1: General concepts - -
ISO/IEC 9646-7 1995 Information technology - Open Systems Interconnection - Conformance testing methodology and framework -
Part 7: Implementation Conformance Statements - -
UIC CODE 556 - Information transmission in the train (train-bus) - -
Annex ZZ (informative)
Coverage of Essential Requirements of EU Directives
This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers all relevant essential requirements as given in Annex III of the EU Directive 2008/57/EC.
Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned.
WARNING: Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard.
IEC 61375-2-2 Edition 1.0 2012-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Electronic railway equipment – Train communication network (TCN) –
Part 2-2: Wire Train Bus conformance testing
Matériel électronique ferroviaire – Réseau embarqué de train (TCN) –
Partie 2-2: Bus de Train Filaire – Essais de conformité
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XD ICS 45.060 PRICE CODE CODE PRIX ISBN 978-2-88912-068-0
– 2 – 61375-2-2 ¤ IEC:2012 CONTENTS FOREWORD . 6 INTRODUCTION . 8 1 Scope . 10 2 Normative references . 10 3 Terms and definitions, Abbreviations, Conventions . 10 3.1 Terms and definitions . 10 3.2 Abbreviations . 11 4 Conformance test: approach, requirements and boundaries . 12 4.1 The approach . 12 4.1.1 Requirements . 12 4.1.2 Requirements declaration statements for an IUT . 14 4.2 Boundaries . 15 4.2.1 General . 15 4.2.2 Basic interconnection tests . 16 4.2.3 Capability tests . 16 4.2.4 Behaviour tests. 17 4.2.5 Conformance resolution tests . 17 4.2.6 Interpretation of clauses/subclauses and statements . 18 4.2.7 Relation to interoperability . 20 4.2.8 Relation to performance test . 20 4.3 Conformance assessment process outline . 21 4.3.1 General . 21 4.3.2 Analysis of results, outcomes and verdicts . 21 5 Conformance test of a WTB node, WTB trunk cable, WTB jumper cables, WTB extension cables. 22 5.1 PICS . 22 5.1.1 Instructions for filling the PICS pro-forma . 22 5.1.2 PICS tables . 24 5.1.3 Basic interconnection tests . 32 5.1.4 Capability tests . 32 5.1.5 Behaviour tests. 32 5.1.6 Link layer interface . 47 5.1.7 The test cases . 58 6 Conformance test of RTP . 68 6.1 Ports and Traffic_Store . 69 6.2 Dataset consistency . 69 6.2.1 Error handling . 69 6.2.2 Freshness supervision . 69 6.2.3 Synchronisation dataset . 69 6.2.4 Dataset polling . 70 6.2.5 Dataset, port and logical address . 70 6.2.6 Traffic_Store Identifier . 70 6.3 Port_Address . 70 6.4 Link_Process_Data_Interface primitives . 70 6.5 Messages services and protocols . 70 SIST EN 61375-2-2:2012
61375-2-2 ¤ IEC:2012 – 3 – 7 Conformance test of a WTB-equipped consist . 70 7.1 General . 70 7.2 PICS . 71 7.2.1 Instructions for filling the PICS pro-forma . 71 7.2.2 Abbreviations . 71 7.2.3 PICS tables . 71 7.3 Test suites . 74 7.3.1 Physical interface tests . 75 7.3.2 DC test: line resistance . 75 7.3.3 WTB Link_layer capabilities . 78 7.3.4 Data test storage . 85 7.4 Consist network interoperability test . 85 7.5 Application profile . 85 7.6 Several nodes on the consist . 85 8 Conformance test of NM . 85 Annex A (normative)
Test laboratory role and client role . 86 Annex B (informative)
Test instrumentation and dedicated test bed . 93 Bibliography . 101
Figure 1 – Insertion loss measurement . 34 Figure 2 – Measurement of the input resistance . 35 Figure 3 – End setting measurement setup 1 . 35 Figure 4 – End setting measurement setup 2 . 36 Figure 5 – Switches measurement setup 1 . 37 Figure 6 – Indirect attachment switches measurements Fixture 1 . 37 Figure 7 – Direct attachment switches measurements Fixture 1 . 38 Figure 8 – Transmitter fixtures . 39 Figure 9 – Transmitter output signal . 40 Figure 10 – Intermediate transmitted noise test fixture . 40 Figure 11 – End node transmitted noise test fixture . 41 Figure 12 – Signal and idling at transmitter . 42 Figure 13 – RF resistor example . 43 Figure 14 – Short-circuit test Fixture 1 . 43 Figure 15 – Receiver signal envelope . 45 Figure 16 – Receiver edge distortion . 46 Figure 17 – Example of relay switch logic diagram for line A . 49 Figure 18 – WTB orientation . 52 Figure 19 – Line switch identification in position P01 . 53 Figure 20 – Line switch identification in position P10 . 53 Figure 21 – Line switch identification in position P32 . 54 Figure 22 – Test suite identifier TTS1 . 55 Figure 23 – Test suite identifier TTS2 . 56 Figure 24 – Test suite identifier TTS3 . 57 Figure 25 – Line resistance . 76 Figure 26 – Crosstalk . 77 SIST EN 61375-2-2:2012
– 4 – 61375-2-2 ¤ IEC:2012 Figure 27 – Propagation delay and attenuation . 78 Figure 28 – Coach tester nodes . 83 Figure B.1 – Hardware test bed architecture . 94 Figure B.2 – Coach tester architecture . 95 Figure B.3 – Configuration of the coach tester . 99 Figure B.4 – WTB line redundancy switch-over . 100
Table 1 – Document structure . 9 Table 2 – Continuance indication . 19 Table 3 – Weak statements . 20 Table 4 – Relation to interoperability . 20 Table 5 – Relation to performance test . 21 Table 6 – PICS pro-forma identification . 24 Table 7 – PICS pro-forma implementation under test . 25 Table 8 – PICS pro-forma IUT supplier and/or test laboratory client . 25 Table 9 – PICS pro-forma identification of the standards . 26 Table 10 – PICS pro-forma global statement of conformance . 26 Table 11 – PICS pro-forma level of testing . 26 Table 12 – PICS pro-forma node capability . 27 Table 13 – PICS pro-forma redundancy . 27 Table 14 – PICS pro-forma redundancy configuration . 27 Table 15 – PICS pro-forma signalling . 28 Table 16 – PICS pro-forma cable . 28 Table 17 – PICS pro-forma trunk cable . 28 Table 18 – PICS pro-forma jumper cable . 29 Table 19 – PICS pro-forma extension cable . 29 Table 20 – PICS pro-forma front panel layout . 30 Table 21 – PICS pro-forma connector arrangement . 30 Table 22 – PICS pro-forma connector layout and type . 31 Table 23 – PICS pro-forma switches type . 32 Table 24 – PICS pro-forma switches . 32 Table 25 – WTB pin to pin measurement. 38 Table 26 – Fault tolerance parameters . 42 Table 27 – Frequency sinusoidal signal . 47 Table 28 – WTB devices configuration . 50 Table 29 – TNM agent services. 51 Table 30 – Mapping Server services . 51 Table 31 – Power switch identifier. 53 Table 32 – Line switch identifier . 53 Table 33 – Test suites . 54 Table 34 – Test sequence node strength . 59 Table 35 – Test sequence change of user report . 59 Table 36 – Test sequence change of node descriptor . 60 SIST EN 61375-2-2:2012
61375-2-2 ¤ IEC:2012 – 5 – Table 37 – Test sequence change of inauguration data . 60 Table 38 – Test sequence inauguration inhibit lengthening . 61 Table 39 – Test sequence sleep state . 61 Table 40 – Test sequence fast insertion . 62 Table 41 – Test sequence late insertion . 62 Table 42 – Test sequence process data . 63 Table 43 – Test sequence individual period 3 . 63 Table 44 – Test sequence individual period 2 . 63 Table 45 – Test sequence coupling of two compositions . 64 Table 46 –Test sequence inauguration time IUT intermediate . 65 Table 47 – Test sequence inauguration time IUT end setting main direction 2 . 65 Table 48 – Test sequence inauguration time IUT end setting main direction 1 . 65 Table 49 – Test sequence failure of the master node . 66 Table 50 – Test sequence line redundancy during regular operation . 66 Table 51 – Test sequence line redundancy during inauguration . 67 Table 52 – Test sequence measurement of basic period . 67 Table 53 – WTB link layer procedures . 68 Table 54 – PICS pro-forma identification . 71 Table 55 – PICS pro-forma WTB consist under test . 72 Table 56 – PICS pro-forma identification of consist WTB node . 72 Table 57 – PICS pro-forma identification of consist trunk cable . 73 Table 58 – PICS pro-forma identification of consist jumper cable . 73 Table 59 – PICS pro-forma identification of consist extension cable . 74
– 6 – 61375-2-2 ¤ IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
ELECTRONIC RAILWAY EQUIPMENT –
TRAIN COMMUNICATION NETWORK (TCN) –
Part 2-2: Wire Train Bus conformance testing
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61375-2-2 has been prepared by IEC technical committee 9: Electrical equipment and systems for railways. This first edition cancels the clauses of IEC 61375-2, first edition, published in 2007, relevant to the specification of WTB conformance testing and constitutes a technical revision. It was prepared taking into account IEC 61375-2-1, first edition. The text of this standard is based on the following documents: FDIS Report on voting 9/1643/FDIS 9/1667/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. SIST EN 61375-2-2:2012
61375-2-2 ¤ IEC:2012 – 7 – This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 61375 series, under the general title Electronic railway equipment – Train communication network (TCN), can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
‡ reconfirmed, ‡ withdrawn, ‡ replaced by a revised edition, or ‡ amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.
– 8 – 61375-2-2 ¤ IEC:2012 INTRODUCTION TCN is an International Standard with the aim of defining interfaces so as to achieve plug-in compatibility:
a) between equipment located in different consists, and b) between equipment and devices located within the same consist.
One of the key success factors for the deployment of any technology is the standardisation and ensuring interoperability among various implementations. To facilitate interoperability a conformance test should be implemented. In this part of IEC 61375, the TCN hierarchical structure deals with the train bus called the Wire Train Bus (WTB). No other busses are taken into consideration even though they are foreseen by IEC 61375. WTB has real-time protocols, which offer two communication services: c) process variables, a distributed, real-time database, periodically refreshed through broadcasting; d) messages, transmitted on demand either as:
0. unicast messages (point-to-point) or/and 1. multicast messages. WTB has a network management, which allows debugging, commissioning and maintenance over the network. This standard is structured into 8 clauses and 2 annexes.
The clauses and annexes are listed and briefly described in Table 1. SIST EN 61375-2-2:2012
61375-2-2 ¤ IEC:2012 – 9 – Table 1 – Document structure Clause Description 1
Scope This clause describes the scope of this standard. 2 Normative references This clause lists the normative references. 3 Terms and definitions, abbreviations, conventions This clause introduces basic terms and abbreviations not reported in IEC 61375-2-1. 4 Conformance test: approach, requirements and boundaries This clause is an overview of the methods of TCN implementation verification that are available to the developer and regulatory personnel. Supplies information concerning the ICS and IXITpPro-forma(s). 5 Conformance test of a WTB node, WTB trunk cable, WTB jumper cables, WTB extension cables Contents: All tests on WTB are classified by nodes related to WTB itself and MVB only. The main contents are: the WTB PICS and PIXIT; the WTB test suites; the WTB test procedures. 6 Conformance test of RTP
This clause lists the tests covered in Clauses 3 and 4 fulfilling the real time protocol.
7 Conformance test of a WTB-equipped consist This clause covers the Physical Layer while the Services given by the WTB node are covered by the previous clauses. Application profiles are covered by other bodies, like communication profile as described in UIC CODE 556. 8 Conformance test of NM Partially covered by Clauses 3 and 4. Remaining parts are not covered. Annex A – Test laboratory and client role This annex is normative. Annex B – Test suites standard instrumentation This annex is informative.
– 10 – 61375-2-2 ¤ IEC:2012 ELECTRONIC RAILWAY EQUIPMENT –
TRAIN COMMUNICATION NETWORK (TCN) –
Part 2-2: Wire Train Bus conformance testing
1 Scope This part of IEC 61375 applies to all equipment and devices implemented according to IEC 61375-2-1, i.e. it covers the procedures to be applied to such equipment and devices when the conformance should be proven. The applicability of this standard to a TCN implementation allows for individual conformance checking of the implementation itself and is a pre-requisite for further interoperability checking between different TCN implementations.
NOTEFor a definition of TCN implementation see IEC 61375-2-1,1.3.
2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60571: Electronic equipment used on rail vehicles
IEC 60807(all parts), Rectangular connectors for frequencies below 3 MHz IEC 61375-2-1: Electronic railway equipment – Train Communication Network (TCN) –
Part 2-1: Wire Train Bus (WTB) ISO/IEC 7498 (all parts): Information technology – Open Systems Interconnection – Basic Reference Model ISO/IEC 9646-1:1994, Information technology – Open Systems Interconnection – Conformance testing methodology and framework – Part 1: General concepts (Also available as ITU-T Recommendation X.290 (1995)) ISO/IEC 9646-7:1994, Information technology – Open Systems Interconnection – Conformance testing methodology and framework – Part 7: Implementation Conformance Statements (Also available as ITU-T Recommendation X.296 (1995)) UIC CODE 556, Information transmission in the train (train-bus) 3 Terms and definitions, abbreviations, conventions 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC 9646-1 and IEC 61375-2-1 apply. SIST EN 61375-2-2:2012
61375-2-2 ¤ IEC:2012 – 11 – 3.2 Abbreviations AVI Application Variables Interface, the definition of the Process Variable services BR Bit Rate, the rate of data throughput on the medium expressed in bits per second (bit/s) or in hertz (Hz), whichever is appropriate BT Bit Time, the duration of the transmission of one bit, expressed in μs CUT Consist under Test DMM Digital Multi Meter ITU International Telecommunication Union, the international standardisation body for telecommunications based in Geneva IUT Implementation Under Test IEC International Electrotechnical Commission, Geneva ISO International Standard Organisation, Geneva LLC Logical Link Control, a sub-layer within the Link Layer ruling the data exchange LME Layer Management Entity, the entity in charge of supervising a layer on behalf of Network Management MAU Medium Attachment Unit, the part of a Node which interfaces electrically to the bus and which provides/accepts binary logic signals MOT Mean of Test MVB Multifunction Vehicle Bus, a Consist network MS Mapping Server, defined in UIC CODE 556 OSI Open System Interconnection, a universal communication model defined in the ISO/IEC 7498 PCTR Protocol Conformance Test Report, defined in ISO/IEC 9646 PICS Protocol Implementation Conformance Statement, defined in ISO/IEC 9646 PIXIT
Protocol Implementation Extra Information for Testing RTP Real-Time Protocols, the common communication protocols for process data and message data TCN Train Communication Network, a set of communicating consist and Train Busses TDR Time Domain Reflectometry, tool for analyzing single-ended and differential transmission lines TNM Train Network Management UIC International Union of Railways , the international railways operators association WTB Wire Train Bus SIST EN 61375-2-2:2012
– 12 – 61375-2-2 ¤ IEC:2012 4 Conformance test: approach, requirements and boundaries 4.1 Approach This standard specifies a general methodology for testing the conformance to the TCN protocol standard of products in which the standard is claimed to be implemented. This standard is organised into clauses structured into different phases of the conformance testing process, these phases being characterised by the following roles: a) the specification of abstract test suites for particular TCN protocols according to ISO/IEC 9646-1; b) the derivation of executable test suites and associated testing tools according to ISO/IEC 9646-7; Annex A specifies the rules on clients and laboratory specifying: c) the role of a client of a test laboratory, having an implementation of TCN protocols to be tested; d) the operation of conformance testing, culminating in the production of a conformance test report which gives the results in terms of the test suite(s) used and the relevant documentation produced. In all clauses of this standard, the scope is limited in order to meet the following objectives: e) to achieve an adequate level of confidence in the tests as a guide to conformance; f) to achieve comparability between the results of the corresponding tests applied in different places at different times; g) to facilitate communication between the parties responsible for the roles described above. Each objective involves the framework for development of TCN test suites, as listed hereinafter: h) how they should relate to the various types of conformance requirement; i) the types of test to be standardised and the types not needing standardisation; j) the criteria for selecting tests for inclusion in a conformance test suite; k) the notation to be used for defining tests; l) the structure of a test suite. Certification, an administrative procedure which may follow conformance testing, is outside the scope of this standard. Requirements for procurement and contracts are outside the scope of this standard. 4.1.1 Requirements 4.1.1.1 General In the context of TCN, a real system is said to exhibit conformance if it complies with the requirements of applicable TCN standard clauses in its communication with a reference system, i.e. the tester. A TCN standard is a set of interrelated clauses which, together, define behaviour of TCN systems in their communication. Conformance of an IUT will, therefore, be expressed at two levels, conformance to each individual clause, and conformance to the set of clauses. SIST EN 61375-2-2:2012
61375-2-2 ¤ IEC:2012 – 13 – The following clauses define the conformance requirements and classify them according to attributes and into feasible groups. Attributes and grouping are defined from the general point of view with reference to a TCN specification itself and from the IUT point of view. In the second case, the requirement shall be declared in the appropriate PICS and PIXIT.
4.1.1.2 Conformance requirements The conformance requirements can be: a) mandatory requirements: these are to be observed in all cases; b) conditional requirements: these are to be observed if the conditions, set out in the clause, apply; c) options: these can be selected to suit the implementation, provided that any requirements applicable to the option are observed.
TCN essential functionality are mandatory requirements; additional functionality can be either conditional or optional requirements. Furthermore, conformance requirements in a Part can be stated: d) positively: they state what shall be done; e) negatively (prohibitions): they state what shall not be done. Finally, conformance requirements fall into two groups: f) static conformance requirements; g) dynamic conformance requirements; these are discussed in 4.1.1.3 and 4.1.1.4, respectively. 4.1.1.3 Static conformance requirements To facilitate interoperability static conformance requirements define the allowed minimum capabilities of an implementation. These requirements may be at a broad level, such as the grouping of functional units and options into protocol classes, or at a detailed level, such as a range of values that have to be supported for specific parameters of timers. Static conformance requirements and options in TCN parts can be of two varieties: a) those which determine the capabilities to be included in the implementation of the particular protocol; b) those which determine multi-layer dependencies, for example those which place constraints on the capabilities of the underlying layers of the system in which the protocol implementation resides. These are likely to be found in upper layer parts (e.g. network management vs real time protocols). All capabilities not explicitly stated as static conformance requirements are to be regarded as optional. 4.1.1.4 Dynamic conformance requirements Dynamic conformance requirements are all those requirements (and options) which determine what observable behaviour is permitted by the relevant TCN part in instances of communication. They form the bulk of each TCN protocol document. They define the set of allowable behaviours of an implementation or real system. This set defines the maximum capability that a conforming implementation or real system can have within the terms of the TCN protocol document. SIST EN 61375-2-2:2012
– 14 – 61375-2-2 ¤ IEC:2012 A system exhibits dynamic conformance in an instance of communication if its behaviour is a member of the set of all behaviours permitted by the relevant TCN protocol part in a way which is consistent with the PICS. 4.1.1.4.1 A conforming system A conforming system or implementation is one which is shown to satisfy both static and dynamic conformance requirements, consistent with the capabilities stated in the PICS, for each protocol declared in the system conformance statement. 4.1.1.4.2 Interoperability and conformance The primary purpose of conformance testing is to increase the probability that different implementations are able to inter-operate. Successful interoperability of two or more real open systems is more likely to be achieved if they all conform to the same subset of a TCN part, or to the same selection of TCN parts, than if they do not. To prepare two or more systems to successfully inter-operate, it is recommended that a comparison is made of the system conformance statements and PICSs of these systems. If there is more than one version of a relevant TCN part indicated in the PICSs, the differences between the versions need to be identified and their implications for consideration, including their use in combination with other parts. While conformance is a necessary condition, it is not on its own a sufficient condition to guarantee interoperability capability. Even if two implementations conform to the same TCN protocol part, they may fail to interoperate because of factors outside the scope of this standard. Trial interoperability is recommended to detect these factors. Further information to assist interoperability between two systems can be obtained by extending the PICS comparison to other relevant information, including test reports and PIXIT. The comparison can focus on: a) additional mechanisms claimed to work around known ambiguities or deficiencies not yet corrected in the TCN standard or in peer real systems, for example solution of multi-layer problems; b) selection of free options which are not taken into account in the static conformance requirements of the TCN parts; c) the existence of timers not specified in the TCN parts and their associated values. NOTEThe comparison can be made between two individual systems, between two or more types of product, or, for the PICS comparison only, between two or more specifications for procurement, permissions to connect, etc. 4.1.2 Requirements declaration statements for an IUT 4.1.2.1 Protocol implementation conformance statement (PICS) To evaluate the conform
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