1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.755.2 (09197) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - Signa System No. 7 management Transaction capabilities test responder ITU-T Recommendation Q.755.2 (Previously CC
2、ITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALL
3、ING SYSTEM RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS General Message transfer part (MTP) Signalling connectio
4、n control part (SCCP) Telephone user part (TUP) ISDN supplementary services Data user part Q.1-Q.3 Q .4-Q. 59 Q.60-Q.99 Q. 1 OO-Q. I I9 Q.120-Q.249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 Q. 500-Q. 599 Q.600-Q.699 Q. 700-Q. 849 Q.700 Q.701-Q.709 Q.711-Q.719 Q.720-Q.729 Q.730-Q.739 Q.740-Q. 749 1) Signai
5、ling System NO. 7 management Q.750-4.759 ISDN user part Transaction capabilities application part Test specification Q3 interface DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN Q. 760-Q. 769 Q.770-Q.
6、779 Q.780-Q.799 Q.800-Q.849 Q.850-Q.999 Q. 1000-Q. 1 O99 Q. 1 1 OO-Q. 1 199 Q.1200-Q.1999 Q.2000-Q.2999 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN Q.755-2-ENGL 1997 4862573 Ob42487 075 S ITU-T RECOMMENDATION Q.755.2 TRANSACTION CAPABILITIES TEST RESPONDER Sum
7、mary The 1993 version of Recommendation Q.755 for Protocol Testers contained just the MTP Tester. It has now been split into a series of Recommendations. Recommendation 4.755.2 defines the Transaction Capabilities (TC) Test Responder; it is an addition to the 1993 version of Recommendation 4.755. A
8、TC Test Responder present in the system under test allows the use of Abstract Test Suites for testing the defined TC functionality of that system, independently of the functionalities employed by the TC-Users actually present. Source ITU-T Recommendation 4.755.2 was prepared by ITU-T Study Group 11
9、(1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 12th of September 1997. - - STD-ITU-T RECMN m755-2-ENGL I1997 m 4862591 Ob42488 TO1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU
10、Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Stan
11、dardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recornmendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution
12、 No. 1. In some areas of information technology which fall within IT-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration an
13、d a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicabili
14、ty of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to impleme
15、nt this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, e
16、lectronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation 4.755.2 (09197) 1 2 3 4 5 5.1 5.2 5.3 5.4 5.5 CONTENTS Page Scope References Symbols and abbreviations . General . TC Test Responder . Architecture TC Testing User ASE . 5.2.1
17、 General principles . 5.2.2 Operations and errors TC test management protocol . 5.3.1 Test management protocol data units 5.3.2 Command structure . 5.3.3 Abstract syntax 5.3.4 Procedures . TC test responder operations and errors . Test management protocol data units . Annex A . Example of use of the
18、 TC test responder Annex B - Implementing loops using the TC Test Responder . Recommendation Q.755.2 (09/97) 1 2 3 4 4 6 6 6 6 6 7 7 8 11 13 15 18 . 111 STD.ITU-T RECMN Q.755.2-ENGL 1997 I 4Bb2591 Ob42490 bbT II Recommendation Q.755.2 TRANSACTION CAPABILITIES TEST RESPONDER (Geneva, 199 7) 1 Scope T
19、his Recommendation defines the Transaction Capabilities (TC) Test Responder, to be used as an aid when testing the TC of ITU Signalling System No. 7. The Recommendation draws upon Recommendation Q.750 for architectural considerations of the relationship between the Test Responder and SS No. 7 manage
20、ment (OMAP) 9. The Recommendation defines a simple and flexible Test Responder which enables the use of Abstract Test Suites (ATS) for Transaction Capabilities independently from the actual TC-Users which reside in a System Under Test (SUT). No assumption is made about the actual implementation of t
21、he interface between this function and TC. The availability of a standardized TC Test Responder has the following advantages: b It makes it possible to write a unique Abstract Test Suite which can be executed against any It allows all the defined TC functionalities to be tested, irrespective of the
22、subset of It helps to isolate faults during testing, since the proper response to a TC message or It allows the TC stack to be tested before being delivered to a customer for supporting one or The Test Responder can even be used to perfom stack-to-stack interoperability testing TC implementation whi
23、ch resides in a system where the Test Responder is also implemented. functionalities actually used by the TC-Users which are available when an equipment is under test. component will be independent of the proper execution of a real TC-User operation. more particular TC-User applications. independent
24、ly of any particular TC-User application. b b b b 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommend
25、ations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly
26、 published. i ITU-T Recommendations X.680-X.683 (1 994), Information technology - Abstract Syntax Notation One (ASN 1). 2 ITU-T Recommendation X.690 (1994) I ISO/IEC 8825-1 :1995, Information technology - ASN. 1 encoding rules: Specijcation of Basic Encoding Rules (BER), Canonical Encoding Rules (CE
27、R) and Distinguished Encoding Rules (DER). Recommendation Q.755.2 (09/97) 1 ITU-T Recommendations Q.711-4.714 (1993), Spec$cations of Signalling System No. 7: Signalling connection control part. CCITT Recommendations 4.771 -Q.775 (1 988), Speczfzcations of Signalling System No. 7: Transaction Capabi
28、lities Application Part (TCAP). ITU-T Recommendations 4.77 1 -Q.775 (1 993), Transaction capabilities application part. ITU-T Recommendation X.290 (1 999, OSI conformance testing methodology and flamework for protocol Recommendations for ITU-T applications - General concepts. ISOiIEC 9646-1 : 1994,
29、Information technology - Open Systems Interconnection - Conformance testing methodology and flamework - Part 1 : General concepts. ITU-T Recommendation 1.320 (1 993), ISDNprotocol reference model. CCITT Recommendation 1.321 (i 991), B-ISDN protocol reference model and its application. ITU Recommenda
30、tion Q.750 (1993), Overview of Signalling System No. 7 management. Symbols and abbreviations This Recommendation uses the following abbreviations: AE APDU ASE ASN. 1 ATS DPC GPC IUT LME LT MIB MSU MT MTP OPC PC PDU SAP SCCP SP Application Entity Application Protocol Data Unit Application Service Ele
31、ment Abstract Syntax Notation One Abstract Test Suite Destination PC Generator PC Implementation Under Test Level Management Entity Lower Tester Management Information Base Message Signal Unit MTP Tester (SS No. 7) Message Transfer Part Originating PC Point Code Protocol Data Unit Service Access Poi
32、nt (SS No. 7) Signalling Connection Control Part Signalling Point SS No. 7 Signalling System No, 7 2 Recommendation 4.755.2 (09/97) SUT System Under Test TC Transaction Capabilities TMP Test Management Protocol TPC Tw-around PC TTCN UT Upper Tester Tree and Tabular Combined Notation 4 General The pr
33、otocol tester may be used as an aid when testing the Transaction Capabilities (TC) of Signalling System No. 7 (SS No. 7), either when performing validation testing of an implementation or compatibility testing between two implementations. The testers main function is simulation of an ordinary user p
34、art or application, as seen from TC for the generation of test traffic. Recommendations 1.320 7 and 1.321 8 specifj the ISDN protocol reference model to be used for N-ISDN and B-ISDN. User plane (U-plane), Control plane (C-plane) and Management plane (M-plane) are identified. The layering principles
35、 apply in each of these planes. The U-plane provides the user information flow transfer with associated controls. The C-plane handles the call and connection control information. The M-plane is divided into two portions, the Layer Management functions and the Plane Management functions. The Plane Ma
36、nagement performs management functions related to a system as a whole; it provides coordination between all the planes and has no layered structure. The Layer Management plane contains Layer Management Entities (LME). Each of them provides management functions relating to resources and parameters re
37、siding in its own protocol entity. Layer Management handles the operation and maintenance information flows. The interface between adjacent layers within a plane and between LME and its associated layer have to be defined in terms of service primitives. The interface between the LMEs and Plane Manag
38、ement does not need to be specified; it is implementation dependent. For SS No. 7, the Level Management Entity is defined by analogy with the LME of Recommendations 1.320 and 1.321. This is to account for the different positions of the boundaries between SS No. 7 lower levels and those of OS1 (e.g.
39、the upper part of the MTP is level 3 in SS No. 7, the SCCP is level 4, but both would be within layer 3 if the OS1 model is strictly applied). For SS No. 7, the term “LME“ is taken to mean “Level Management Entity“, Thus the TT (TC Test Responder) is within the LME of the application AE. The procedu
40、res, the messages and the TT substructure are described. The undefined primitives between the Plane Management (MIB) and the TT are only required to activate/deactivate the concerned testing functions (see Figure 1, which is a copy of Figure 5/Q.750). Recommendation 4.755.2 (09/97) 3 I _-_-_- I v Ca
41、ll control MAP application services SS No. 7 Management process + OMASE-User (-, LMI MIB MTP (Levels 1-3) Pl LME -1 SMSI OM-prim i A, ASE ISDN UP LME I AI 4 Figure UQ.755.2 - SS No. 7 management and internal configuration of an SP For an explanation, see Figure 514.750 9. 5 TC Test Responder 5.1 Arc
42、hitecture The TC Test Responder is a particular TC-User which can be implemented together with TC in any system, using several possible configurations. The communication between the TC Test Responder which resides in a System Under Test (SUT) and a Test System relies on the use of a particular ASE,
43、called the “TC Testing User“ ASE. The TC Test Responder plays the role of the ASE supplier while the Test System plays the role of the ASE consumer. 4 Recommendation 4.755.2 (09/97) STDmITU-T RECMN Q-755-2-ENGL I1997 I 4862592 0642494 205 The TC Testing User ASE can be implemented as the single comp
44、onent of an Application Entity (AE) with a particular subsystem number, or it can be combined with other application layer elements in which case it is selected by using any application-context-name starting with the following value: (itu-t recommendation q 755 ac(5) The SCCP 3, allocates a subsyste
45、m number which may be used for addressing an AE which contains the Test Responder (e.g. when only Blue Book TC facilities are available). According to OS1 Methodology for Conformance Testing 6, the set of data units conveyed between the instances of Test Responder and Test System can be considered a
46、s an “in-band Test Management Protocol (TMP), which can be used to support coordinated test methods between the Test Responder acting as an Upper Tester (UT) and the Lower Tester (LT) functionality of the Test System (see Figure 2). I Test system System under test I I LT I I Testing Testing coordina
47、tion procedures TMP-PDU user ASE IUT (TC) TI 185390-97 Figure 2/Q.755.2 - Arrangement for test architecture The use of this Test Responder does not require any access to the TC service interface within the SUT, nor does it place any constraints on its implementation. This Test Responder does not pro
48、vide means for testing the behaviour of a TC implementation in response to invalid behaviour of the local TC-User. The “in-band“ nature of the TMP implies that, although being under test, the TC service is reliable enough to carry such PDUs and deliver them to a User. In order to overcome potential
49、difficulties due to a missing or unreliable TC service, the Testing User ASE procedures are defined in such a way that each TMP-PDU can be received in different types of messages or components. The main purpose of the TMP is to allow a series of commands to be sent from the Test System to the Test Responder in order to provoke some behaviour in the TC Implementation Under Test (IUT). Each command is either a TC service primitive to be passed by the Test Responder to the TC under test or an indication that the Test Responder should wait for
