1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.782TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2002) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 Test specification MTP level 3 test specification ITU-T Recommendation Q.782 ITU-T Q-SERIES RECOMMENDATIONS SWITCHI
2、NG AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEM No. 4 Q.120
3、Q.139 SPECIFICATIONS OF SIGNALLING SYSTEM No. 5 Q.140Q.199 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250Q.309 SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310Q.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATION
4、S OF SIGNALLING SYSTEM No. 7 Q.700Q.799 General Q.700 Message transfer part (MTP) Q.701Q.709 Signalling connection control part (SCCP) Q.711Q.719 Telephone user part (TUP) Q.720Q.729 ISDN supplementary services Q.730Q.739 Data user part Q.740Q.749 Signalling System No. 7 management Q.750Q.759 ISDN u
5、ser part Q.760Q.769 Transaction capabilities application part Q.770Q.779 Test specification Q.780Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1
6、200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.782 (04/2002) i ITU-T
7、 Recommendation Q.782 MTP level 3 test specification Summary This Recommendation contains a set of detailed tests of Signalling System No. 7, MTP level 3 protocol. These tests intend to validate the protocol specified in ITU-T Recs. Q.704 and Q.707. The level 3 performance aspects specified in ITU-T
8、 Rec. Q.706 are also partly checked whenever possible. This Recommendation conforms to ITU-T Rec. Q.780. However, in addition to the objectives and guidelines of the latter Recommendation, other general principles specific to level 3 tests are presented. Source ITU-T Recommendation Q.782 was prepare
9、d by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedure on 13 April 2002. ii ITU-T Rec. Q.782 (04/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Sta
10、ndardization Sector (ITU-T) is a permanent organ of ITU. 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 Standardization Assembly (WTSA),
11、which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall withi
12、n ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS I
13、TU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU mem
14、bers or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may n
15、ot represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. Q.782 (04/2002) iii CONTENTS Page 1 I
16、ntroduction 1 2 General principles of level 3 tests. 1 2.1 Presentation of test descriptions . 1 2.2 Presentation of the test list 1 2.3 Test traffic 2 3 Test configurations . 3 3.1 Definition 3 3.2 Presentation of test configurations . 3 3.2.1 General . 3 3.2.2 Configuration A 4 3.2.3 Configuration
17、 B 4 3.2.4 Configuration C 5 3.2.5 Configuration D 6 4 Test list . 8 5 Test descriptions . 13 ITU-T Rec. Q.782 (04/2002) 1 ITU-T Recommendation Q.782 MTP level 3 test specification 1 Introduction This Recommendation contains a set of detailed tests of Signalling System No. 7 MTP level 3 protocol. Th
18、ese tests intend to validate the protocol specified in ITU-T Recs. Q.704 and Q.707. The level 3 performance aspects specified in ITU-T Rec. Q.706 are also partly checked whenever possible. This Recommendation conforms to ITU-T Rec. Q.780. However, in addition to the objectives and guidelines of the
19、latter Recommendation, other general principles specific to level 3 tests are presented below. 2 General principles of level 3 tests 2.1 Presentation of test descriptions Each test description mentions the type of SP involved in the test. Three cases are possible: test applicable to an SP having no
20、STP function: SP test applicable to an SP having STP function: STP test applicable to all types of SPs: ALL Each test description includes the environment in which the point under test must be inserted in order to pass the test. Four test configurations are necessary (named A, B, C and D); they are
21、presented in clause 3. Each test is precisely described. Nevertheless, some events not directly concerning the point under test, or without direct link with the test nature, are not explicitly described. This is, for example, the case of TFPs propagation when a point becomes isolated, or of the chan
22、geover procedure in a test concerning transfer allowed procedure. In order to preserve the test description implementation independence, a certain flexibility has been left in the test descriptions. This is particularly the case when it is necessary to deactivate a link (where it is only mentioned “
23、Deactivate“ with no more precision). The operator will choose, if possible, according to the implementation particularities and the events expected in the test description, the appropriate deactivation means (MML, provoked failure, etc.). In the test descriptions, the signalling links are identified
24、 as follows: “number of linkset“number of link in the linkset“ (e.g. 11 means link 1 of the linkset 1). This identification is independent of SLC attributed to these links. When the number of the link is X, that means that the concerned message can use any link of the linkset. When the field “number
25、 of link in the linkset“ is, for example, “1, 2, . . .“, that means that the traffic uses all indicated links. Finally, when the links are identified by the mention ALL, that means that the traffic will use all available links of the point. The orders “Start traffic“, “Wait“ and “Stop traffic“ apply
26、 to the test configuration. They are placed at the beginning of the line. 2.2 Presentation of the test list These tests, as a whole, aim at a complete validation of the level 3 protocol without redundancies. The test list is presented in clause 4. The national options and the various signalling link
27、 management “policies“ are not included in this Recommendation. 2 ITU-T Rec. Q.782 (04/2002) The first set of tests in the list checks that, before some more precise tests, the point under test can perform the basic functions, i.e. can connect itself to the external environment and exchange signalli
28、ng messages. The second set basically validates the signalling message handling function of the point under test. A main point of this part concerns the validation of load sharing procedures. If an implementation does not use the load sharing between linksets, some tests would not be applicable, and
29、 others should be adapted. The third and fourth sets check changeover and changeback procedures. They include tests like changeover and changeback to/from two linksets which will be performed only if the point under tests allows this possibility. Rerouting procedures are checked using the tests in s
30、ets 5 and 6. Set 7 concerns tests to check inhibition and uninhibition procedures. To limit the test numbers, it was not considered that the messages used in these procedures can be transferred via STPs. Set 8 concerns tests to check transfer controlled procedure and MTP user flow control for the in
31、ternational signalling network. Set 9 concerns tests to check signalling route management functions in a point having an STP function. To limit the test numbers and to avoid complicating the test configuration, it was not considered that TFPs and TFAs can be transferred via STPs. Set 10 concerns tes
32、ts for the point restart procedure. Set 11 deals with STP traffic test. Set 12 checks the signalling link test procedure. Finally, set 13 contains solely validation tests and aims at checking the actions of the tested system on reception of invalid level 3 messages. 2.3 Test traffic Running the test
33、s described in this Recommendation requires the exchange of traffic between the point under test and its environment. The traffic used is a test traffic especially generated for the test of the system. It uses variable length messages, structured as described below: ITU-T Rec. Q.782 (04/2002) 3 T115
34、7730-02876543210000000SIODPCOPCSLSNDATAOrder of bit transmissionOrder of octet transmissionSISSF(Note)Any value= A, B, C, D, E or F depending of the testNumber identifying one messageamong all messages pertaining toa given signalling relation Length of DATA fieldVariable field used for variable leng
35、thmessage generation (SIF up to 272 octets).It is coded with 0.LNOTE For compatibility testing (CPT), use SI value for MTP testing user part, for validation testing (VAT) value is to be chosen as required. The mechanisms of generation and reception of this test traffic may be internal to the point u
36、nder test or external (using a simulator for example). The tests presented here do not impose the choice of one of these mechanisms except for the tests of the STP function itself (tests 2.7, 8.2, 10 and 11) where the test traffic is necessarily generated outside the STP. The test traffic should be
37、recorded and analysed subsequently for each described test. 3 Test configurations 3.1 Definition The set of tests described in this Recommendation assumes that the point under test is inserted in a test environment called “test configuration“. A test configuration is defined as being: a) the set of
38、points, real or simulated, linked between them by signalling linksets, real or simulated, and of which some are connected to the point under test by one or several signalling linksets; b) the set of routing rules applied in different points and also in point under test; c) the flows of test traffic
39、generated and received by d) a set of generation and reception means (see 2.3); e) the means (program, operator interface, etc.) to run the described tests; notably the possibilities of storage and analysis of test traffic and level 3 messages and, in the case of validation tests, the possibility to
40、 send at any stage of a test, any messages (level 3 or test) valid or not. 3.2 Presentation of test configurations 3.2.1 General The set of tests described in this Recommendation requires 4 different configurations named A, B, C and D. For each test, only the three first aspects of the above definit
41、ion are precisely defined (set of points, set of routing rules and test traffic flows, see 3.1). 4 ITU-T Rec. Q.782 (04/2002) 3.2.2 Configuration A This simple configuration is adapted to the validation of all procedures concerning only one or more signalling links belonging to one linkset. It is us
42、ed for the tests: of activation and deactivation of links; of changeover and changeback procedures; of inhibition and uninhibition of links; invalid messages. Configuration A is shown in Figure 1. L1L2T1157740-02SP A SP B SP Cin VAT onlyFigure 1/Q.782 Configuration A Configuration A, Table 1, makes
43、use of a point C in all validation tests in order to check the impact of the procedures on various traffic flows. Point C is not used in configuration A in the case of compatibility tests. Linkset 1 has four signalling links in order to check, for example, changeover procedure to several links withi
44、n a linkset (test 3.15). In real networks, the procedures checked with this configuration act on the traffic carried in both directions of a link. Consequently, the flows of test traffic used are, regarding the routing label of messages: OPC = A, DPC = B and OPC = B, DPC = A OPC = A, DPC = C and OPC
45、 = C, DPC = A (in validation test only). Table 1/Q.782 Routing rules in configuration A A B C A L1 L1 B L1 L2 C L2 L2 3.2.3 Configuration B Configuration B is adapted to the validation of all procedures concerning several signalling linksets. It is used for the tests: of signalling message handling;
46、 of changeover and changeback; of forced and controlled rerouting. Configuration B is shown in Figure 2. ITU-T Rec. Q.782 (04/2002) 5 L1 L2T1157750-02L3L4L6L7L8L5SP ASP D SP ESP B SP Cin VAT onlyFigure 2/Q.782 Configuration B In configuration B, Table 2, the point under test A is linked to the exter
47、nal world with 3 signalling linksets. This is the minimum required number of linksets in order to check: load sharing between three linksets; changeover and changeback from/to two linksets (see 5.3.1/Q.704). Table 2/Q.782 Routing rules in configuration B A B C D E A L2, L3 L3, L2 L1-L2-L3 L2-L3 B L2
48、, L4 L4 L5, L4 L6, L4 C L3, L4 L4 L8, L4 L7, L4 D L1, L5, L8 L5, L8 L8, L5 Any E L7, L6 L6, L7 L7, L6 Any Li, Lj Li normal linkset and Lj alternative linkset Li-Lj Load sharing between Li and Lj When the SP A is an SP having no STP function, this configuration is also the minimum to run the tests in
49、 a network situation where associated mode and quasi-associated mode are used (see 3.1.2/Q.701). This configuration comprises point D in all validation tests in order to check the impact of the procedures on various traffic flows (relations A-D and A-E). The point D is not used in configuration B in case of compatibility tests. In a real network, some procedures (changeover, changeback) checked with this configuration act on the traffic in both directions on the concerned linksets. Con
