1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.781TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2002) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 Test specification MTP level 2 test specification ITU-T Recommendation Q.781 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.781 (04/2002) i ITU-T
7、 Recommendation Q.781 MTP level 2 test specification Summary This Recommendation contains a set of detailed tests of Signalling System No. 7 MTP level 2 protocol. These tests intend to validate the protocol specified in ITU-T Rec. Q.703. This Recommendation conforms to ITU-T Rec. Q.780 which describ
8、es the basic rules of the Test Specification. In addition, the conditions which are specific to level 2 tests are described. Source ITU-T Recommendation Q.781 was prepared 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.781 (04
9、/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questio
10、ns and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations o
11、n 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 within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the
12、 expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed
13、Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability 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, ITU had not r
14、eceived notice of intellectual property, protected by patents, which may be required to implement 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. ITU 2002 All rights reser
15、ved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. Q.781 (04/2002) iii CONTENTS Page 1 Introduction 1 2 General principles of level 2 tests 1 2.1 Presentation of test descriptions. 1 2.2 Presentation of the test list .
16、 1 3 Test configuration. 1 4 Test environment 1 5 Test list . 2 6 Test descriptions. 6 ITU-T Rec. Q.781 (04/2002) 1 ITU-T Recommendation Q.781 MTP level 2 test specification 1 Introduction This Recommendation contains a set of detailed tests of signalling system No. 7 MTP level 2 protocol. These tes
17、ts intend to validate the protocol specified in ITU-T Rec. Q.703. This Recommendation conforms to ITU-T Rec. Q.780 which describes the basic rules of the Test Specification. In addition, the conditions which are specific to level 2 tests are described in the following clauses. 2 General principles o
18、f level 2 tests 2.1 Presentation of test descriptions The level 2 tests aim at testing the level 2 protocol conformance in a given implementation. Each test description indicates in the “type of test“ column; “Validation“ (VAT) or “Validation“ (VAT) and “compatibility“ (CPT). Although signal units a
19、re transmitted and received continuously on level 2, only the signal units which cause and/or indicate the changes of level 2 status are shown in the EXPECTED SIGNAL UNIT SEQUENCE column of each test description. 2.2 Presentation of the test list These tests as a whole, aim at a complete validation
20、of the level 2 protocol without redundancies. Each test is described as simply as possible to check precisely each elementary function of the protocol, which is referred in the columns “reference“, “title“ and “subtitle“ of each test description. This list is presented in the form of a succession of
21、 tests. The presentation order is essentially functional. However, the operator performing these tests may change this order, taking into account some other practical criteria such as: use pre-test conditions to order the list, the end of a given test may be the pre-test condition of another test. 3
22、 Test configuration A single link will be used for level 2 tests. Figure 1 shows a single link between SP A and SP B. Test specifications are written to test the level 2 of the SP A. T1157160-93Link 1 0 (Note)RxSP ATx(under test)SP BTxRxNOTE First digit: linkset number.Second digit: link number.Figu
23、re 1/Q.781 Test configuration of MTP level 2 test configuration 1 4 Test environment See 6.2/Q.780. 2 ITU-T Rec. Q.781 (04/2002) 5 Test list NOTE Compatibility test items are indicated in this list by an asterisk (*). The abbreviations PO, LPO, RPO, EM and EDA are used for processor outage, local pr
24、ocessor outage, remote processor outage, emergency and expected delay of acknowledgement, respectively. 1 Link State Control Expected signal units/orders (see Figures 8 and 9/Q.703) * 1.1 Initialisation (Power-up) * 1.2 Timer T2 1.3 Timer T3 1.4 Timer T1 and T4 (Normal) * 1.5 Normal alignment correc
25、t procedure (FISU) 1.6 Normal alignment correct procedure (MSU) 1.7 SIO received during normal proving period 1.8 Normal alignment with PO set (FISU) 1.9 Normal alignment with PO set (MSU) 1.10 Normal alignment with PO set and clear 1.11 Set RPO when “Aligned not ready“ 1.12 SIOS received when “Alig
26、ned not ready“ 1.13 SIO received when “Aligned not ready“ 1.14 Set and clear LPO when “Initial alignment“ 1.15 Set and clear LPO when “Aligned ready“ 1.16 Timer T1 in “Aligned not ready“ state 1.17 No SIO sent during normal proving period 1.18 Set and cease emergency prior to “start alignment“ * 1.1
27、9 Set emergency while in “not aligned state“ 1.20 Set emergency when “aligned“ 1.21 Both ends set emergency 1.22 Individual end sets emergency 1.23 Set emergency during normal proving 1.24 No SIO sent during emergency alignment * 1.25 Deactivation during initial alignment 1.26 Deactivation during al
28、igned state 1.27 Deactivation during aligned not ready 1.28 SIO received during link in service * 1.29 Deactivation during link in service 1.30 Deactivation during LPO 1.31 Deactivation during RPO * 1.32 Deactivation during the proving period ITU-T Rec. Q.781 (04/2002) 3 1.33 SIO received instead of
29、 FISUs 1.34 SIOS received instead of FISUs 1.35 SIPO received instead of FISUs 2 Link State Control Unexpected signal units/orders (see Figure 8/Q.703) 2.1 Unexpected signal units/orders in “Out of service“ state 2.2 Unexpected signal units/orders in “Not aligned“ state 2.3 Unexpected signal units/o
30、rders in “Aligned“ state 2.4 Unexpected signal units/orders in “Proving“ state 2.5 Unexpected signal units/orders in “Aligned ready“ state 2.6 Unexpected signal units/orders in “Aligned not ready“ state 2.7 Unexpected signal units/orders in “In service“ state 2.8 Unexpected signal units/orders in “P
31、rocessor outage“ state 3 Transmission failure (see Figure 8/Q.703) 3.1 Link aligned ready (Break Tx path) 3.2 Link aligned ready (Corrupt FIBs Basic) 3.3 Link aligned not ready (Break Tx path) 3.4 Link aligned not ready (Corrupt FIBs Basic) * 3.5 Link in service (Break Tx path) 3.6 Link in service (
32、Corrupt FIBs Basic) 3.7 Link in processor outage (Break Tx path) 3.8 Link in processor outage (Corrupt FIBs Basic) 4 Processor Outage Control (see Figure 10/Q.703) 4.1 Set and clear LPO while link in service 4.2 RPO during LPO 4.3 Clear LPO when “Both processor outage“ 5 SU Delimitation, Alignment,
33、Error Detection and Correction (see Figures 11 and 12/Q.703) 5.1 Seven or more “1“s between MSU opening and closing flags 5.2 Greater than maximum signal unit length 5.3 Below minimum signal unit length 5.4 Reception of single and multiple flags between FISUs 5.5 Reception of single and multiple fla
34、gs between MSUs 6 SUERM Check (see Figure 18/Q.703) 6.1 Error rate of 1 in 256 Link remains in service 6.2 Error rate of 1 in 254 Link into out of service 6.3 Consecutive corrupted SUs 6.4 Time controlled break of the link 4 ITU-T Rec. Q.781 (04/2002) 7 AERM check (see Figure 17/Q.703) 7.1 Error rat
35、e below the normal threshold 7.2 Error rate at the normal threshold 7.3 Error rate above the normal threshold 7.4 Error rate at the emergency threshold 8 Transmission and reception control (Basic) (see Figures 13 and 14/Q.703) 8.1 MSU transmission and reception 8.2 Negative acknowledgement of MSU 8.
36、3 Check RTB full 8.4 Single MSU with erroneous FIB 8.5 Duplicated FSN 8.6 Erroneous retransmission Single MSU 8.7 Erroneous retransmission Multiple FISUs 8.8 Single FISU with corrupt FIB 8.9 Single FISU prior to RPO being set 8.10 Abnormal BSN Single MSU 8.11 Abnormal BSN Two consecutive FISUs 8.12
37、Excessive delay of acknowledgement 8.13 Level 3 Stop Command 9 Transmission and reception control (PCR) (see Figures 15 and 16/Q.703) * 9.1 MSU transmission and reception 9.2 Priority control 9.3 Forced retransmission with the value N19.4 Forced retransmission with the value N29.5 Forced retransmiss
38、ion cancel 9.6 Repetition of forced retransmission 9.7 MSU transmission while RPO set 9.8 Abnormal BSN Single MSU 9.9 Abnormal BSN Two MSUs 9.10 Unexpected FSN 9.11 Excessive delay of acknowledgement 9.12 FISU with FSN expected for MSU 9.13 Level 3 Stop Command ITU-T Rec. Q.781 (04/2002) 5 10 Conges
39、tion Control (see Figure 19/Q.703) 10.1 Congestion abatement 10.2 Timer T7 10.3 Timer T6 10.4 Congestion and RTB empty 6 ITU-T Rec. Q.781 (04/2002) 6 Test descriptions MTP, LEVEL 2 TEST NUMBER: 1.1 PAGE: 1 OF 1 REFERENCE: Clause 7/Q.703 STD: Fig. 8; Fig. 12; Fig. 13 TITLE: Link State Control Expecte
40、d signal units/orders SUBTITLE: Initialization (Power-up) PURPOSE: To check that the No. 7 terminal equipment enters the correct state on power-up PRE-TEST CONDITIONS: Line equipment ON; No. 7 equipment OFF CONFIGURATION: 1 TYPE OF TEST: VAT, CPT EXPECTED SIGNAL UNIT SEQUENCE: SP B SP A Link Link 1
41、0 SIOS - : Power ON : start : start T4 (Pn) : start TEST DESCRIPTION 1. Start normal alignment procedure. 2. Check link aligns and enters “In service“ state. 3. Check that “In service“ state is maintained. 4. In VAT only check it is possible to perform a normal alignment procedure in the following c
42、ases: use LSSU in point B with a status field of 8 bits; use LSSU in point B with a status field of 16 bits. ITU-T Rec. Q.781 (04/2002) 11 MTP, LEVEL 2 TEST NUMBER: 1.6 PAGE: 1 OF 1 REFERENCE: Clause 7/Q.703 STD: Fig. 8; Fig. 9 TITLE: Link State Control Expected signal units/orders SUBTITLE: Normal
43、alignment correct procedure (MSU) PURPOSE: To check normal alignment procedure PRE-TEST CONDITIONS: Link out of service CONFIGURATION: 1 TYPE OF TEST: VAT EXPECTED SIGNAL UNIT SEQUENCE: SP B SP A Link Link : start TEST DESCRIPTION 1. Start normal alignment procedure. 2. Check link aligns and enters
44、“In service“ state. 3. Check that “In service“ state is maintained. 12 ITU-T Rec. Q.781 (04/2002) MTP, LEVEL 2 TEST NUMBER: 1.7 PAGE: 1 OF 1 REFERENCE: Clause 7, 10.3/Q.703 STD: Fig. 9; Fig. 17 TITLE: Link State Control Expected signal units/orders SUBTITLE: SIO received during normal proving period
45、 PURPOSE: To test the response to the reception of an SIO during the normal proving period PRE-TEST CONDITIONS: Link out of service CONFIGURATION: 1 TYPE OF TEST: VAT EXPECTED SIGNAL UNIT SEQUENCE: SP B SP A Link Link : start _T4 Stopped _ 1 0 SIO (one only) - 1 0 SIN - : set LPO : start : set LPO :
46、 start : set LPO : clear LPO : start TEST DESCRIPTION 1. Check that normal alignment is carried out. 2. Check that link aligns and enters “In service“ state. 16 ITU-T Rec. Q.781 (04/2002) MTP, LEVEL 2 TEST NUMBER: 1.11 PAGE: 1 OF 1 REFERENCE: Clauses 7 and 8/Q.703 STD: Fig. 8 TITLE: Link State Contr
47、ol Expected signal units/orders SUBTITLE: Set RPO when “Aligned not ready“ PURPOSE: To check the response following normal alignment when PO has been set PRE-TEST CONDITIONS: Link out of service; ability to set PO CONFIGURATION: 1 TYPE OF TEST: VAT EXPECTED SIGNAL UNIT SEQUENCE: SP B SP A Link Link
48、: set LPO : set LPO : start TEST DESCRIPTION 1. Set LPO at A and B. 2. Start alignment. 3. Check that both LPO and RPO after alignment completes. ITU-T Rec. Q.781 (04/2002) 17 MTP, LEVEL 2 TEST NUMBER: 1.12 PAGE: 1 OF 1 REFERENCE: Clauses 7 and 8/Q.703 STD: Fig. 8 TITLE: Link State Control Expected
49、signal units/orders SUBTITLE: SIOS received when “Aligned not ready“ PURPOSE: To check the response following normal alignment when PO has been set PRE-TEST CONDITIONS: Link out of service CONFIGURATION: 1 TYPE OF TEST: VAT EXPECTED SIGNAL UNIT SEQUENCE: SP B SP A Link Link : set LPO : start : set LPO : start : start : clear LPO :
