1、INTERNATIONAL TELECOM M UN CATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2934 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signa I I i ng (05/98) Digital subscriber Signalling System No. 2 - Switched virtual path capability ITU-T
2、Recommendation (Previously CCITT Recommendation) Q.2934 STD*ITU-T RECMN Q-293q-ENGL 1998 E YBb259L Ob53899 20b ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR
3、 SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM 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 SU
4、BSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS I NTE L LI G ENT NETWORK BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling network protocols Common aspects of B-ISDN application protocols for access signalling and
5、network signalling and interworking CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS B-ISDN application protocols for the network signalling B Q.l-Q.3 Q .4-Q. 59 Q .60-Q. 99 Q.lOO-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. 1 O99 Q
6、. 1 1 00-Q. 1 1 99 Q.1200-Q.1999 Q.2000-Q.2999 Q.2000-Q.2099 Q.2100-Q.2199 Q.2200-Q.2299 Q.2600-Q.2699 Q.2700-Q.2899 Q.2900-Q.2999 Foi- further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION Q.2934 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - SWITCHED VIRTUAL PATH CAPAB
7、ILITY Summary This Recommendation specifies the procedures for establishing, maintaining, and clearing of switched virtual path connections. It specifies extensions to Recommendations 4.293 1 i, Q.2961.1 2, Q.2961.2 3, 4.2961.3 4, Q.2961.4 5 and 4.2961.6 6 to provide this capability. Source ITU-T Re
8、commendation 4.2934 was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 15th of May 1998. FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The TT Telecommun
9、ication 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 Standardizatio
10、n 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 Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In
11、some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recornmendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recog
12、nized 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 applicability of cla
13、imed 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 implement this R
14、ecommendation. 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, electronic
15、 or mechanical, including photocopying and microfilm, without permission in writing from the ITU. II Recommendation Q.2934 (05/98) 1 2 4 5 6 6.1 6.2 6.3 7 7.1 7.2 8 8.1 8.2 8.3 8.4 9 9.1 9.2 9.3 10 11 11.1 11.2 12 CONTENTS Page Scope References Definitions Abbreviations . Description . Operational r
16、equirements . Provision and withdrawal . Requirements on the originating network side . Requirements on the destination network side. Primitive definitions and state definitions Primitive definitions . State definitions Coding requirements . Information elements Broadband bearer capability . Connect
17、ion identifier Restart indicator OAM traffic descriptor . Signalling procedures at the coincident S, and TB reference point CaWconnection establishment at the origination interface . 9.1.2 Non-associated signalling . Call/connection establishment at the destination interface . 9.2.1 Associated signa
18、lling . 9.2.2 Non-associated signalling . Restart procedure Procedures at the T, reference point for intenvorking with private B-ISDNs . 9.1.1 Associated signalling . 9.2.3 Compatibility check Interworking with other networks Intenvorking with entities which do not support the SVP capability . Inten
19、vorking with N-ISDN . Interactions . Recommendation 4.2934 (0998) 1 1 2 2 3 3 3 3 3 4 4 8 9 . 111 Page 12.1 Interactions with supplementary services . 9 9 12.2 Interactions with other capabilities . . 13 Timers . 9 14 Dynamic description (SDLs) 9 Annex A - Valid combinations of bearer class, broadba
20、nd transfer capability and ATM . traffic descriptor parameters 9 Appendix I - Management of VPCI and bandwidth . 14 iv Recommendation Q.2934 (0998) Recommendation Q.2934 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - SWITCHED VIRTUAL PATH CAPABILITY (Geneva, 1998) 1 Scope This Recommendation specifies
21、 the procedures for establishing, maintaining, and clearing of switched virtual path connections by means of the Digital Subscriber Signalling System No. 2 (DSS 2) protocol in a point-to-point call/connection. The procedures are applicable at the T, reference point or coincident S, and T, reference
22、point (as defined in Recommendation 1.413) of the Broadband-Integrated Services Digital Network (B-ISDN). This Recommendation is part of the DSS 2 family of ITU-T Recommendations. It specifies extensions to Recommendations 4.2931 i, 4.2961.1 2, 4.2961.2 3, 4.2961.3 4, 4.2961.4 5 and Q.2961.6 6 and d
23、oes not repeat states, information elements, messages and procedures contained therein but only specifies extensions related to the switched virtual path capability. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, consti
24、tute 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
25、 Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation 4.293 1 (1 9959, Digital subscriber Signalling System No. 2 - User Network Interface (UNI) layer 3 speclJication for basic call/connection control and
26、its Amendment 1 (1997). ITU-T Recommendation Q.2961.1 (1 993, Digital subscriber Signalling System No. 2 - Additional trafic parameters: Additional signalling capabilities to support trafJic parameters for the tagging option and the sustainable GII rate parameter set. ITU-T Recommendation 4.296 1.2
27、(1 997), Digital subscriber Signalling System No. 2 - Additional trafic parameters: Support of ATM Transfer capability in the broadband bearer capability information element. ITU-T Recommendation 4.2961.3 (1997), Digital subscriber Signalling System No. 2 - Additional trafjc parameters: Signalling c
28、apabilities to support trafic parameters for the Available Bit Rate (ABR) ATM transfer capability. ITU-T Recommendation 4.296 1.4 (1 997), Digital subscriber Signalling System No. 2 - Additional traffic parameters: Signalling capabilities to support trafic parameters for the ATM Block Transfert (ABT
29、) ATM transfer capability. ITU-T Recommendation Q.2961.6 (1998), Digital subscriber Signalling System No. 2 - Additional trafic parameters: Additional signalling procedures for the support of the SBR2 and SBR3 ATM transfer capabilities. Recommendation Q.2934 (05/98) 1 ITU-T Recommendation 4.2962 (1
30、998), Digital subscriber Signalling System No. 2 - Connection characteristics negotiation during caWconnection establishment phase. ITU-T Recommendation 4.2963.1 (1996), Digital subscriber Signalling System No. 2 - Connection modijkation: Peak cell rate modijcation by the connection owner. ITU-T Rec
31、ommendation Q.2963.2 (1 997), Digital subscriber Signalling System No. 2 - Connection modijkation: Modijcation procedures for sustainable cell rate parameters. ITU-T Recommendation Q.2963.3 (1 998), Digital subscriber Signalling System No. 2 - Connection modijkation - ATM trafic descriptor modzjkati
32、on with negotiation by the connection owner. ITU-T Recommendation Q.295 1 (1 995), Stage 3 description for number identzfication supplementary services using B-ISDN Digital subscriber Signalling System No. 2 (DSS 2) - Basic call. ITU-T Recommendation Q.2955 (1997), Stage 3 description for community
33、of interest supplementary services using B-ISDN Digital subscriber Signalling System No. 2 (DSS 2). ITU-T Recommendation 4.2957 (1 995), Stage 3 description for additional information transfer supplementary services using B-ISDN Digital subscriber Signalling System No. 2 (DSS 2) - Basic call. ITU-T
34、Recommendation 4.2964.1 (1996), Digital subscriber Signalling System No. 2 - Basic Look-ahead. ITU-T Recommendation 4.2959 (1996), Digital subscriber Signalling System No. 2 - Call priority. ITU-T Recommendation 1.371 (1 996), TrafJic control and congestion control in B-ISDN. ITU-T Recommendation 1.
35、356 (1 996), B-ISDN ATM layer cell transfer performance. Definitions The definitions of Annex JQ.293 1 11 apply. This Recommendation defines the following term: switched virtual path connection: A virtual path connection controlled by signalling procedures. 4 Abbreviations The definitions of Annex J
36、/Q.293 1 11 apply. This Recommendation also uses the following abbreviations: ATM Asynchronous Transfer Mode B-ISDN Broadband-Integrated Services Digital Network DSS 2 Digital subscriber Signalling System No. 2 2 Recommendation Q.2934 (05/98) 5 Description This Recommendation specifies the signallin
37、g protocol for establishing, maintaining, and releasing point-to-point, switched virtual path connections. 6 Operational requirements 6.1 Provision and withdrawal It is a user and network option to provide the procedures described in this Recommendation. Some networks may not support these procedure
38、s when a VP cross-connect is used to connect the user to the network. If implemented, the procedures of this Recommendation may be provided as a subscription option to the served user on the origination side. 6.2 See 6.1. Requirements on the originating network side 6.3 See 6.1. Requirements on the
39、destination network side 7 Primitive definitions and state definitions 7.1 Primitive definitions Clause WQ.293 1 11 shall apply. 7.2 State definitions No additional states to those specified in Recommendation 4.293 1 11 are required. 8 See clause 4/Q.2931 i, clause WQ.2961.1 2, clause 6/Q.2961.2 3,
40、clause WQ.2961.3 4 and clause WQ.2961.4 5. This clause identifies the changes to support the switched virtual path capability. Coding requirements - Information elements 8.1 Broadband bearer capability The definition of the broadband bearer capability information element given in Recommendations 4.2
41、961.2 3, 4.2961.3 4, 4.2961.4 5 and 4.2961.6 6 is extended as shown in Table 1 below. The following codepoint is added to the bearer class field in octet 5: Table UQ.2934 -Broadband bearer capability information element Bits (Octet 5) 54321 11000 Transparent VP Service Recommendation Q.2934 (05/98)
42、3 STD-ITU-T RECHN Q-293Y-ENGL 1998 D 48b257L Ob53707 102 = 8.2 Connection identifier The codepoint 100 shall be added to the preferred/exclusive field in octet 5 in Table 4-16/Q.293 1 i, and a Note 4 shall be added as follows: Bits (Octet 5) 321 O O 1 1 O O NOTE 4 - In the restart procedure, either
43、“Exclusive VPCI; any VCI“ or “Exclusive VPCI; no VCI“ may be used to indicate a virtual path to be restarted. Exclusive VPCI; any VCI (see Note 4) Exclusive VPCI; no VCI (see Note 4) Note 1 in Figure 4-22/Q.293 1 11 shall be replaced with the following Note: NOTE 1 - If the preferred/exclusive field
44、 indicates “any VCI“ or “no VCI“, the VCI field shall be ignored. 8.3 Restart indicator For the following two class field codepoints the semantics and Notes 2 and 3 shall be changed as follows: Bits (Octet 5) 321 O O 1 indicated switched virtual path or all virtual channels in the indicated VPC whic
45、h are controlled via the signalling channel on which the RESTART message is sent (see Note 2) O 1 O all Switched Virtual Channels and switched virtual paths controlled by the layer 3 entity which sends the RESTART message (see Note 3) NOTE 2 - The connection identifier information element shall be i
46、ncluded and indicates the switched virtual path to be restarted or the virtual path connection in which all Switched Virtual Channels are to be restarted. The virtual chaniiel identification field in the connection identifier information element is ignored. NOTE 3 - The connection identifier informa
47、tion element is not included. All Switched Virtual Channels and paths controlled by the point-to-point signalling channel are to be restarted. 8.4 OAM traffic descriptor In 4.5.24/Q.2931 l, Figure 4-30/Q.2931 i and Table 4-22/Q.2931 i, replace all occurrence of “OAM F5 flow“ with “OAM F4 flow“. The
48、following sentence is added to the last part of 4.5.24lQ.2931 i: “OAM traffic descriptor information element is used for OAM F4 flow in case of SVP, and OAM F5 flow in case of SVC“. In 4.5.6/Q.2931 i and Annex UQ.2931 i, replace all occurrence of “OAM F5 flow“ with “OAM F4 flow“ except in the Note i
49、n 1.3. 4 Recommendation Q.2934 (05198) 9 This clause identifies changes to the procedures of Recommendations 4.2931 i, Q.2961.1 2, 4.2961.3 4, Q.2961.4 5 and 4.2961.6 6 to support the switched virtual path capability. Signalling procedures at the coincident S, and T, reference point 9.1 CalYconnection establishment at the origination interface 9.1.1 Associated signalling Associated signalling does not apply when supporting switched virtual paths. 9.1.2 Non-associated signalling In order to request
