1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.221 O SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - Signalling network protocols (07/96) Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140 ITU-T Re
2、commendation Q.221 O (Previously CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATION OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYST
3、EM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTEL
4、LIGENT NETWORK BROADBAND ISDN General aspects ATM adaptation layer Signalling network protocols Common aspects of B-ISDN application protocols for access signalling and network signalling and interworking B-ISDN application protocols of the network B-ISDN application protocols for access signalling
5、INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.1-Q.3 Q .4-Q. 59 Q.60-Q.99 Q.IOO-Q.119 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.850-Q.999 Q. 1000-Q.l O99 Q.1100-Q.1199 Q. 1200-Q. 1 999 Q.2000-Q.2999 Q.
6、2000-Q.2099 Q.2100-(2.2199 Q.2200-(2.2599 Q.2600-Q.2699 Q.2700-Q.2899 Q.2900-Q.2999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION Q.2210 MESSAGE TRANSFER PART LEVEL 3 FUNCTIONS AND MESSAGES USING THE SERVICES OF ITU-T RECOMMENDATION Q.2140 Summary This Reco
7、mmendation specifies Message Transfer Part level 3 functions and messages that are suitable for the control of signalling links that provide the service of ITU-T Recommendation 4.2140. Source ITU-T Recommendation 4.2210 was prepared by ITU-T Study Group 11 (1993-1996) and was approved under the WTSC
8、 Resolution No. 1 procedure on the 9th of July 1996. STD-ITU-T RECMN Q-2210-ENGL L97h 48b2531 Ob29332 Tbl FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a pe
9、rmanent 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 Standardization Conference (WTSC), which meets every four ye
10、ars, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). In some areas of inf
11、ormation technology which fall within ITU-T?s purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression ?Administrationy? is used for conciseness to indicate both a telecommunication administration and a recognized operating
12、agency. O ITU 1997 All rights reserved. No part 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 the ITU. Il Recommendation 4.2210 (07196) 1 2 2.1 2.2 3 4 5 6 6.1 6.2 6.3
13、7 8 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 10 STD-ITU-T RECMN Q-2210-ENGL L99b m Lib259L Ob29LL3 7T CONTENTS Scope References Normative references Informative references Abbreviations and acronyms Definitions General description . Boundaries of MTP level 3 using the services of Recommendation Q.2 140
14、 . Definition of the lower boundary of MTP level 3 with SSCF at NNI Definition of the upper boundary of MTP level 3 Recommendation Q.2 140 . Interactions between level 1 and MTP level 3 using the services of Intenvorking between signalling links that provide the services of Recommendation Q.2140 i w
15、ith signalling links offering the services of Recommendation 4.703 ri . Compatibility in MTP-3 b . Signalling network functions and messages . Maximum SDU size . Changeover procedure Signalling route set congestion method according to 11.2.3iQ.704 2 . Signalling link management . Service indicator .
16、 Coding conventions General format of messages conveying peer-to-peer information of user parts . Formats and codes of signalling network management messages . 9.8.1 Changeover message . 9.8.2 User part unavailable message Timers and timer values . Testing and maintenance Appendix I . Insights into
17、architectural aspects and boundaries of MTP-3 using the services of Recommendation 4.2 140 . I . 1 Introduction Page 1 1 1 1 1 2 2 3 3 3 4 4 4 5 5 5 5 6 6 6 6 7 7 8 8 8 8 8 . Recommendation 4.2210 (07/96) 111 Page 1.2 Functional architecture of the MTP-3 using the services of Recommendation 4.2 140
18、. . . . . . . . . . . . , . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . , Elements for layer-to-layer communication . . . . . . . . . . . 1.3.1 General 1.3.2 Definition of the lower boundary of the MTP-3 in p
19、erforming MTP-3b functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3.3 Definition of the upper boundary of the MTP-3 . . . . . 1.3.4 Defin
20、ition of the boundary between the MTP-3 and Management System 1.4.2 Signalling traffic flow control . 1.4.3 Signalling link management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . 1.3 9 13 13 14 16 20 21 2
21、2 iv Recommendation 4.2210 (07196) STDoITU-T RECMN Q.2210-ENGL 177b LiBb2571 Ob27115 770 Recommendation Q.2210 MESSAGE TRANSFER PART LEVEL 3 FUNCTIONS AND MESSAGES USING THE SERVICES OF ITU-T RECOMMENDATION Q.2140 (Geneva, 1996) 1 Scope This Recommendation specifies Message Transfer Part level 3 fun
22、ctions and messages that are suitable for the control of signalling links that provide the services of Recommendation Q.2140 i. These functions and messages will informally be referred to as MTP-3b within this Recommendation. Any additional specifications for the interworking between signalling link
23、s that provide the services of Recommendation Q.2140 i and signalling links offering the services of Recommendation 4.703 8 are beyond the scope of this Recommendation. 2 Refer ences The following Recommendations and other references contain provisions which, through reference in this text, constitu
24、te provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations 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 R
25、ecommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. Normative references ITU-T Recommendation 4.21 40 (1 995), B-ISDN signalling ATM Adaptation Layer - Service Spectjc Coordination Function for signalling at the Network Node I
26、nterface (SSCF at NNO. ITU-T Recommendation Q.704 (1 993), Signalling network functions and messages. CCITT Recornmendation 4.707 (1 988), Testing and maintenance. CCITT Recommendation 4.701 (1 988), Functional description of the Message Transfer Part (MP) of Signalling System No. 7. Glossary of Ter
27、ms used in Signalling System No. 7, CCITT Blue Book, Fascicle VI.7, 1988. ITU-T Recommendation 4.75 1.1 (1 999, Network element management information model for the Message Transfer Part (7kTP). Informative references ITU-T Recommendation Q.700 (1 993), Introduction to CCITT Signalling System No. 7
28、ITU-T Recommendation Q.703 (1 996), Signalling link. Recommendation Q.2210 (07/96) 1 - STD-ITU-T RECMN Q*2210-ENGL 197b LiBb2591 Ob29LLb b07 3 Abbreviations and acronyms For the purposes of this Recommendation, the following abbreviations are used. AAL ATM B-ISDN DPC FSN HO H1 LSB LSLA LSLD LSLR MSB
29、 MTP MTP-3b “I OPC SAAL SDU SIF SI0 SLC SLS SSCF XCA xco ATM Adaptation Layer Asynchronous Transfer Mode Broadband ISDN Destination Point Code Forward Sequence Number Heading Code which identifies the message group Heading Code which identifies the signals in a message group Least Significant Bit Si
30、gnalling link activation function Signalling link deactivation function Signalling link restoration function Most Significant Bit Message Transfer Part Message Transfer Part level 3 functions and messages according to this Recommendation Network Node Interface Originating Point Code Signalling ATM A
31、daptation Layer Service Data Unit Signalling Information Field Service Information Octet Signalling Link Code Signalling Link Selection Service Specific Coordination Function Extended Changeover Acknowledgement Extended Changeover Order 4 Definitions Definitions of MTP level 3 terms are provided in
32、the glossary of CCITT Blue Book, Fascicle VI.7 5 and in Annex B/Q.751.1 6. 5 General description If MTP level 3 is used for the control of signalling links that provide the services of Recommendation 4.2140 i, Recommendations Q.704 2 and 4.707 3 shall apply with the 2 Recommendation Q.2210 (07/96) m
33、odifications as described in this Recommendation. Furthermore specific parts of Recommendation 4.701 143 shall apply as specified in this Recommendation. In the case of conflicting statements between this Recommendation and Recommendations 4.701 4, 4.704 2 or 4.707 3, this Recommendation takes prece
34、dence over Recommendations 4.701 4, 4.704 2 and Q.707 33. 6 Boundaries of MTP level 3 using the services of Recommendation Q.2140 6.1 The primitives required by MTP level 3 (MTP-3b) at the lower boundary are specified in clause 7/Q.2140 13. NOTES 1 - The primitives AAL-FLUSH-BUFFERS and AAL-CONTINUE
35、 should not be issued because no remote processor outage indication is provided to MTP level 3 by the underlying SAAL. In fact, due to the SAAL behaviour, the processor outage (both local and remote) always results in Out of Service of the concerned link. 2 - The primitive AAL-LINK-CONGESTED contain
36、s the congestion parameter “level“ (values from O through 3) if the option “multiple congestion thresholds“ (3.8.2.2/Q.704 2) applies; the level value O indicates that the signalling link is uncongested. 3 - The primitive AAL-LINK-CONGESTIONCEASED will not be received if the option “multiple congest
37、ion thresholds“ applies (see Note 2). 4 - According to the specification of the AAL boundary in Recommendation 4.2140 l, the primitive AAL-BSNT-NOT-ETFUEVABLE is issued by the underlying layer rather than issued from an “unspecified implementation dependent function“ as stated in Recommendation Q.70
38、4 2 e.g. Figure 27/Q.704 (sheet 2 Definition of the lower boundary of MTP level 3 with SSCF at NNI of 3). 6.2 The primitives supported by MTP level 3 at the upper boundary are specified in clause 8/Q.7014. Table 1 has been replicated from Table UQ.701 4; only the references have been updated to iden
39、ti the appropriate Recommendations: Definition of the upper boundary of MTP level 3 Recommendation 4.2210 (07/96) 3 STD-ITU-T RECMN Q=ZZLO-ENGL 199b 98b2591 Ob27118 tBT Primitives Generic name Specific name I Parameters MTP-TRANSFER MTP-PAUSE (Stop) MTP-RESUME (Start) MTP-STATUS 6.3 Interactions bet
40、ween level 1 and MTP level 3 using the services Recommendation Q.2140 Request OPC (2.2.3Q.704 2) Indication DPC (2.2.3Q.704 2) SLS (2.2.414.704 2) (Note 1) SI0 (14.2/Q.704) User data (subclause 9.1 of this Recommendation) Indication Affected DPC Indication Affected DPC Indication Affected DPC Cause
41、(Note 2) of When the services of Recommendation 4.2140 are used, there are no interactions between MTP level 3 with level 1. The signals “Connect“ between LSLNLSLR and level 1, and “Disconnect“ between LSLD and level 1 are not applicable. 7 Interworking between signalling links that provide the serv
42、ices of Recommendation 4.2140 i with signalling links offering the services of Recommendation 4.703 8 In principle, signalling links that provide the services of Recommendation 4.2140 l and signalling links offering the services of Recommendation Q.703 8 could be connected to the same signalling poi
43、nt. Network design or administrative means beyond the scope of this Recommendation shall prevent the routing of messages that are too long (as defined in Recommendation 4.703) to links offering the services of Recommendation 4.703 8. Any additional specifications for the interworking between signall
44、ing links that provide the services of Recommendation 4.2140 i and signalling links offering the services of ITU-T Recommendation Q.703 8 are beyond the scope of this Recommendation. 8 Compatibility in MTP3b To enable forward compatibility with future implementations of MTP-3b, the requirements defi
45、ned in 6.1/Q.701,6.2/Q.701 and 6.314.701 4 apply. 4 Recommendation Q.2210 (0796) STDIITU-T RECMN Q-22LO-ENGL 1996 qdb259L Ob27117 3Lb Allocated values for HOFI1 codes are those defined in Recommendation 4.704 2 and in this Recommendation. The messages received that are associated with a procedure wh
46、ich is not supported are discarded and no action is taken. 9 This clause specifies the modifications to Recommendation Q.704 2. Signalling network functions and messages 9.1 Maximum SDU size The maximum amount of user data supported by MTP level 3 for signalling links that provide the services of Re
47、commendation 4.2140 i is 4091 octets. NOTE - The maximum size SDU including the Service Information Octet (SIO) supported by SSCF at NNI is 4096 octets, whereas the maximum size SIF supported by signalling links offering the services of Recommendation 4.703 SI is 272 octets. 9.2 Changeover procedure
48、 The requirements of clause 5/Q.704 2 shall apply with the following exceptions and clarifications: i) The Signalling link failure indication causes listed in 3.2.2 a)/Q.704 2 do not apply. The criterion for initiation of changeover is the transition of a signalling link that provides the services o
49、f Recommendation Q.2140 i from the In Service to the Out Of Service state or when a request (automatic or manual) is obtained from a management or maintenance system as specified in 3.2.2 b)/Q.704 2. Moreover a signalling link that is available is recognized by level 3 as failed when an extended changeover order or an emergency changeover order is received. Subclause 5.3.1 b)/Q.704 Z does not apply. Instead of the changeover message format according to 15.4/Q.704 2, the format of t
