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1、 STD-ISO 8882-2-ENGL 2000 4853903 083239b 74b m INTERNATIONAL ISOIIEC STANDARD 888212 Third edition 2000-04-1 5 Information technology - Telecom m u n i ca t i o ns and i n format i o n exchange between systems - X.25 DTE conformance testing - Part 2: Data link layer conformance test suite Technolog
2、ies de /information - Tlcommunications et change dinformation entre systmes - Test de conformit X.25 DTE - Parfie 2: Suite dessais de conformit pour la couche liaison de donnes Reference number ISO/I EC 8882-2:2000( E) Q ISOIIEC 2000 Copyright International Organization for Standardization Provided
3、by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOIIEC 888213 Third edition 2000-04-1 5 Information technology - Telecommunications and i
4、nformation exchange between systems - X.25 DTE conformance testing - Part 3: Packet layer conformance test suite Technologies de linformation - Tlcommunications et change dinformation entre systmes - Test de conformit X.25 DTE - Partie 3: Suite dessais de conformit pour la couche paquet Reference nu
5、mber ISOA EC 8882-3:2000( E) 0 ISOIIEC 2000 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- STD
6、-IS0 BBBZ-Z-ENGL 2000 4853903 0832398 519 INTERNATIONAL STANDARD ISO/IEC 888212 Third edition 2000-04-1 5 Information technology - Telecommunications and information exchange between systems - X.25 DTE conformance testing - Part 2: Data link layer conformance test suite Technologies de linformation
7、- Tlcommunications et change dinformation entre systmes - Test de conformit X.25 DTE - Partie 2: Suite dessais de conformit pour la couche liaison de donnes Reference number I SOIIEC 8882-2:2000( E) Q ISOIIEC 2000 Copyright International Organization for Standardization Provided by IHS under license
8、 with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-IS0 8882-2-ENGL 2000 4853903 0832399 455 = ISOIIEC 8882-2:2000(E) PDF disclaimer This PDF file may contain embedded typefaces In
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10、es licensing policy. The IS0 Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-crealion parameters were optimized for
11、printing. Every care has been taken to ensure that the file is suitable for use by IS0 member bodies. In the unlikely event that a problem relating to it is found, please infonn the Central Secretariat at the address given below. O ISOIIEC 2000 All rights reserved. Unless otherwise specified, no par
12、t of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IS0 at the address below or ISOs member body in the country of the requester. IS0 copyright office Case postale 5
13、6 CH-I21 1 Geneva 20 Tel. + 41 22 749 O1 11 Fax + 41 22 734 10 79 E-mail copynghtiso.ch Web www.iso.ch Printed in Switzerland O ISOAEC 2000 -All rights resewed Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/99725450
14、01 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-IS0 8882-2-ENGL 2000 4851903 0832200 T T m ISOIIEC 8882-2:2000() Contents Page 1 . SCOPE i 2 . NORMATIVE REFERENCES 2 3 . DEFINITIONS AND ABBREVIATIONS 2 3.1 REFERENCE MODEL DEFINITIO
15、NS 3 3.2 CONFORMANCE TESTING TERMS . 3 3.3 X.25-DTE CONFORMANCE TESTING TERMS 4 3.4 ADDITIONAL DEFINITIONS 4 3.5 ABBREVIATIONS . 4 4 . TEST SUITE INFORMATION 4 4.1 TEST SUITE STRUCTURE 4 4.2 DATA LINK LAYER TEST GROUPS AND SUBGROUPS . 5 4.3. METHOD FOR CONFORMANCE TESTING 5 4.4 TEST CASE NOTATION 5
16、4.5 PREAMBLE 6 4.6 VERIFICATION SEQUENCE . 6 4.7 IUT INITIATED ACTIONS 7 4.8 ACCEPTABLE UNEXPECTED IUT FRAMES . 7 4.9 TRANSIENT STATES 7 4.10 UNREACHABLE STATES 7 4.1 1 DECLARATIONS 7 4.12 ENCODING AND ORDER OF BIT TRANSMISSION 7 4.13 PIXIT PROFORMA . 8 4.14 CLASSIFICATION OF IUT . 9 ANNEX A ABSTRAC
17、T TEST SUITE (ATS) . 10 A.l THE TTCN GRAPHICAL FORM (TTCN.GR) 1 0 A.2 THE TTCN MACHINE PROCESSABLE FORM (TTCN.MP) . 10 O ISO/IEC 2000 -All rights reserved iii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/997254500
18、1 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- STD.IS0 8882-2-ENGL 2000 H 4853903 0832201 933 ISOIIEC 8882-2:2000(E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commissi
19、on) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 an
20、d IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with IS0 and IEC, also take part in the work. International Standards are drafted in accordance with the rules given in the ISOIIEC Directives, Part 3
21、. In the field of information technology, IS0 and IEC have established a joint technical committee, ISOIIEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at lea
22、st 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO/IEC 8882-2 may be the subject of patent rights. IS0 and IEC shall not be held responsible for identifying any or all such patent rights. International Standard ISOIIEC 8
23、882-2 was prepared by Joint Technical Committee ISOIIEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems. This third edition cancels and replaces the second edition (ISOllEC 8882-2:1995), which has been technically revised. ISOIIEC 8882 co
24、nsists of the following parts, under the general title Information technology - Telecommunications and information exchange between systems - X.25 DTE conformance testing: - Part I: General principles - Pari 2: Data iink layer conformance test suite - Part 3: Packet layer conformance test suite Anne
25、x A forms a normative part of this part of ISO/IEC 8882. iv O ISO/IEC 2000 -All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or net
26、working permitted without license from IHS -,-,- ISOIIEC 8882-2:2000(E) Introduction This part of ISOIIEC 8882 presents the X.25-DTE Conformance Test Suite for Data Link Layer, described in Tree and Tabular Combined Notation (TTCN). ISOiiEC 8882-1 explains the objectives and usage of this part of IS
27、OiIEC 8882. Clause 1 of this part of ISOIIEC 8882-2 is the scope which provides an objective basis for the applicability of the tests within this part of ISO/IEC 8882. Clauses 2 and 3 give the references, definitions and abbreviations used in this part of ISOilEC 8882. Clause 4 contains information
28、relating to procedures performed in conformance testing. The test suite structure is defined in terms of test groups and subgroups in Table 1. This clause also gives an overview of the test suite. Annex A provides information on the Abstract Test Suite for the X.25-DTE LAPB Data Link Layer protocol
29、both in TTCN GR and TTCN MP format. O ISOIIEC 2000 -All rights reserved V Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted with
30、out license from IHS -,-,- STD.ISO 8882-2-ENGL 2000 4851903 0832203 0 b INTERNATIONAL STANDARD ISOllEC 8882-2:2000(E) Information technology - Telecommunications and information exchange between systems - X.25 DTE conformance testing - Part 2: Data link layer conformance test suite 1 Scope This part
31、 of ISOIIEC 8882 defines an abstract test suite for testing the conformance of the Data Link Layer of an IUT with respect to ISOllEC 7776 (1986,1995) or the ITU-T Recommendation X.25 (1980,1984,1988,1993). Conformance of a Data Terminal Equipment (DTE) to the above IS0 International Standard or ITU-
32、T Recommendations is tested using a dedicated circuit between the tester and the DTE. It is noted that ITU-T Recommendations X.25 (1980), X.25 (1984), X.25 (1988) and X.25 (1993) are written from the perspective of a DCE and therefore do not ahvays explicitly specify the DTEs operation. In such case
33、s it is assumed that recommended operation of a DTE is included by implication because of the need to communicate with X.25 DCEs. This part of ISOIIEC 8882 excludes the testing of the LAP procedures given in the ITU-T Recommendations. NOTE Test cases for extended mode operation (Modulo 128), rnultil
34、ink procedure and DTE-DTE operation as per ISOIIEC 7776 are for further study. The tests in this part of ISO/IEC 8882 are designed for six possible interworking situations, shown in Figure 1. This part specifies tests for all six cases shown in Figure 1, but recognizes that not every test may apply
35、to a particular DTE. A test selection procedure has to be performed to determine the applicability of a test to a particular DTE. Such selection will be based on the PICS and the PIXIT. Local Station Remote Station DCE (X.25 LAPB 84) DTE (ISOIIEC 7776:1995) (based on ISOIIEC 7776:1995) DCE (X.25 LAP
36、B 84) DTE (ISO/IEC 7776:1986) (based on ISOIIEC 7776:1986) (X.25 LAPB 93) (X.25 LAPB 80) Figure I - Testlng X.25-DTEIDCE and X.25-DTEIDTE Interworking Q ISOIIEC 2000 -All rights reserved 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA T
37、echnical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- STD.ISO 8882-2-ENGL 2000 4851903 0832204 b42 ISOIIEC 8882-2:2000(E) In the rest of this part of ISOIIEC 8882, the term “X.25 standards“ means all four of ITU-
38、T Recommendations X.25 (1980), X.25 (1984), X.25 (1988), X.25 (1993), and International Standards ISOIIEC 7776 (1995) and ISOIIEC 7776 (1986), unless stated otherwise. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of th
39、is part of ISOIIEC 8882. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISOIIEC 8882 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated be
40、low. Members of IEC and IS0 maintain registers of currently valid International Standards. ISOIIEC 7498-1:1994, Information technology - Open Systems Interconnection - Basic Reference Model: The Basic Model. (See also ITU-T Recommendation X.200) ISOIl EC 7776: 1 995, Information technology - Telecom
41、munications and information exchange between systems - High-level data link control procedures - Description of the X.25 LAPB-compatible DTE data link procedures. ISOIIEC 8824:1990, Information technology - Open Systems Interconnection - Specification of Abstract Syntax Notation One (ASN. I ) . ISOI
42、IEC 8882-1 :1996, Information technology - Telecommunications and infomation exchange between systems - X.25-DTE conformance testing - Part 1: General principles. ISOIl EC 9646-1 :I 994, Information technology - Open Systems Interconnection - Conformance testing methodology and framework - Part I: G
43、eneral concepts. (See also ITU-T Recommendation X.290) ISOIIEC 9646-2:1994, Information technology - Open Systems Interconnection - Conformance testing methodology and framework - Part 2: Abstract Test Suite specification. (See also ITU-T Recommendation X.291) ISOIIEC 9646-3: 1998, Information techn
44、ology - Open Systems Interconnection - Conformance testing methodology and framework - Part 3 : The Tree and Tabular Combined Notation (TTCN). ISOIIEC 9646-4: 1994, Information technology - Open Systems Interconnection - Conformance testing methodology and framework - Part 4: Test realization. (See
45、also TU-T Recommendation X.293) ISOIl EC 9646-51 994, Information technology - Open Systems Interconnection - Conformance testing methodology and framework - Part 5: Requirements on test laboratories and clients for the conformance assessment process. (See also ITU-T Recommendation X.294) ITU-T Reco
46、mmendations X.25 (1980), X.25 (1984). X.25 (1988), X.25 (1993), Interface between Data Terminating Equipment (DTE) and Data Circuit-terminating Equipment (OC) for terminals operating in the packet mode and connected to the public data networks by dedicated circuit. 3 Terms, definitions and abbreviat
47、ions For the purposes o f this part of ISOIIEC 8882, the terms and definitions given in 3.4 and in the following International Standards apply: a) ISO/IEC 7498-1; b) ISOIIEC 9646; C) ISOIIEC 8882-1. 2 O ISO/IEC 2000 -All rights reserved Copyright International Organization for Standardization Provid
48、ed by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 05:06:52 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-IS0 8882-2-ENGL 2000 4853903 0832205 589 ISOIIEC 8882-2:2000(E) 3.1 Reference model terms The following terms defined in ISOllEC 7498-1 are used: a) b) Data Link Layer (N)-protocol data unit (N-PDU). In the context of this part of