1、STD*ITU-T RECMN G-9b7-2-ENGL 2999 48b2592 ObbL340 Ob2 INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU G.967.2 (02199) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital transmission systems - Digital sections and digital line sy
2、stem - Digital section and digital transmission systems for customer access to ISDN V-interfaces at the service node (SN): VB5.2 reference point specification ITU-T Recommendation G. 967.2 (Previously CCITT Recommendation) STD.1TU-T RECON G-967.2-ENGL LTT? .II 4862591 Obbb341 TTT = ITU-T G-SERIES RE
3、COMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS INTERNA TIONA L A NA LOWE CARRIER SYSTEM TRANSMISSION SYSTEMS INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARACTERISTICS CO
4、MMON TO ALL ANALOGUE CARRIER- GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE WITH METALLIC LINES SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TES TING E QUIPMEN TS TRANSMISSION MEDIA CHARACTERISTICS DIGITAL TRANSMISSION S
5、YSTEMS TERMINAL EQUIPMENTS DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM General Parameters for optical fibre cable systems Digital sections at hierarchical bit rates based on a bit rate of 2048 kbis Digital line transmission systems on cable at non-hierarchical bit rates Digital line sy
6、stems provided by FDM transmission bearers Digital line systems G. 1 00-G. i 99 G.200-G.299 G.300-G.399 G.400-G.449 G.450-G.499 G. 600-G .699 G.700-G.799 G. 800-G . 899 G.900-G.999 G.900-G.909 G.910-G.919 G.920-G.929 G. 9304.939 G ,940-(3.949 G. 950-G. 959 .96 Optical fibre submarine cable systems O
7、ptical line systems for local and access networks Access networks G. 970-G . 979 G. 980-G. 989 G.990-G.999 Far further details, please refe. to ITU-T List of Recommendations V-INTERFACES AT THE SERVICE NODE (SN): VB5.2 REFERENCE POINT SPECIFICATION Summary This Recommendation specifies the physical,
8、 procedural and protocol requirements for interfaces at the VB5.2 reference point between an Access Network (AN) and a Service Node (SN). The VB5.2 reference point provides flexible (provisioned) virtual path link allocation and flexible (provisioned) virtual channel link allocation (controlled by t
9、he 43 interfaces) as well as on-demand virtual channel link allocation controlled by the SN via the broadband bearer connection control (B-BCC) protocol. That is the VB5.2 reference point is a superset of the VB5.1 reference point, enabling on-demand virtual channel link allocation in the AN and acr
10、oss the VB5 reference point via the additional B-BCC function. Source ITU-T Recommendation G.967.2 was prepared by ITU-T Study Group 13 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 15th of February 1999. Keywords Access Network, Service Node, VB5 reference point. Rec
11、ommendation 6.967.2 (02/99) I .STD-ITU-T RECMN G.9b3.2-ENGL 1999 = 48b259L ObbL343 871 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 permanent organ of th
12、e 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 years, establishes th
13、e 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 some areas of information technology which fall within ITU-T?s pu
14、rview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation the term recognized operating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administra
15、tion, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). 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 take
16、s 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, the ITU had not received notice of intellectual pr
17、operty, 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. O ITU 1999 All rights reserved. No part of this publicatio
18、n 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. Recommendation G.967.2 (02/99) 11 1 2 3 3.1 3.2 4 5 5.1 5.2 5.3 5.4 5.5 6 6.1 6.2 6.3 6.4 - STDmITU-T RECMN G*9h72-ENGL 3999 H 4862
19、593 Obh1344 708 CONTENTS Scope References Definitions. symbols and abbreviations . Definitions Abbreviations . Field of application . Introduction to the VB5.2 reference point concept General VB5.2 design principles General reference model for the VB5.2 reference point . General characteristics of i
20、ndividual functional groups . User port function characteristics 5.3.1 5.3.2 5.3.3 ATM connection function characteristics . Service port function characteristics . Functional modelling 5.4.1 Modelling of user port function 5.4.2 Modelling of service port function 5.4.3 Modelling of ATM connection f
21、unction . AN view and SN view of physical and logical ports Procedural interface requirements Introduction Physical layer requirements ATM layer requirements 6.3.1 Cell header format and encoding and pre-assigned cell headers for use by the ATM layer . 6.3.2 Cell Loss Priority (CLP) . 6.3.3 VPC carr
22、ying RTMC and B-BCC protocol VCCs . 6.3.4 OAM Higher layer interface requirements . 6.4.1 User plane 6.4.2 Control plane . 6.4.3 Management plane 6.4.4 Establishment of VP and VC linkskonnections . 6.4.5 ATM adaptation layer for the RTMC protocol . 6.4.6 ATM adaptation layer for the B-BCC protocol P
23、age 1 2 5 5 5 8 8 8 9 9 9 10 10 10 10 10 10 11 11 11 12 12 12 13 13 13 13 13 13 13 14 14 14 . Recommendation 6.967.2 (02/99) 111 6.5 6.6 6.7 7 7.1 7.2 7.3 7.4 7.5 7.6 8 8.1 8.2 8.3 9 9.1 9.2 9.3 9.4 10 Meta-signalling . Interface Management Application Usage information transfer . Broadband access n
24、etwork connection types . Introduction to connections/connection elements Multipoint requirements . Broadband access network connection element identifiers 7.3.1 Connection element identifiers in user-to-network signalling messages 7.3.2 Connection element identifiers in RTMC messages . 7.3.3 Connec
25、tion element identifiers in B-BCC messages Overview of broadband access network connection types . B-ISDN type broadband access network connections Type B broadband access network connections Type C broadband access network connections Non-B-ISDN type broadband access network connections Type D broa
26、dband access network connections Type E broadband access network connections 7.5.1 7.5.2 7.5.3 Type A broadband access network connections 7.6.1 7.6.2 Handling of non-B-ISDN access types . General considerations . ATM based accesses . 8.2.1 General approach . 8.2.2 User plane 8.2.3 Control plane . 8
27、.2.4 Management plane 8.3.1 General approach . Non-ATM based accesses 8.3.2 8.3.3 Analogue and 64 kbits based narrow-band accesses as supported by V5 interfaces . Other non-ATM based non-B-ISDN accesses Transfer and layer management functions General functional architecture Functional architecture o
28、f transfer and layer management functions . Transfer functions required for individual broadband AN connection types . Functions associated with logical and physical ports . Provisioning principles and requirements 16 16 16 16 16 16 16 17 17 18 18 18 18 21 21 21 22 22 22 22 23 23 24 24 24 26 26 26 2
29、6 28 30 30 31 iv Recommendation 6.967.2 (02f99) 10.1 10.2 10.3 11 11.1 11.2 12 12.1 12.2 13 13.1 13.2 13.3 13.4 13.5 General . Provisioning principles common for the VB5.1 and VB5.2 reference point concept Provisioning principles specific for the VB5.2 reference point concept Requirements for real-t
30、ime coordination between AN and SN Principles and requirements for real-time management coordination (RTMC) . Principles and requirements for broadband bearer connection control (B-BCC) . 1 1.2.1 General principles for B-BCC . 11.2.2 Establishment of bearer connections . 1 1.2.3 Release of bearer co
31、nnections . 11.2.4 Modification of traffic parameters of established bearer connections 11.2.5 B-BCC reset 1 1.2.6 Automatic congestion control . 11.2.7 B-BCC start-up and B-BCC restart requirements . 1 1.2.8 Procedural requirements Performance design objectives Performance design objectives for tra
32、nsfer functions Performance design objectives for RTMC and B-BCC functions . VB5.2 system architecture. structure and procedures Introduction and overview RTMC system architecture . RTMC procedures B-BCC system architecture 13.4.1 System diagrams . 13.4.2 Block diagrams VB5.2 connection control func
33、tions . 13.5.1 General 13.5.2 Interworking with user signalling . 13.5.3 13.5.4 13 S.5 Release of connections 1 3.5.6 13.5.7 13.5.8 Release of branches . 13.5.9 13.5.1 O AN fault procedure 13.5.1 1 B-BCC Reset . Selection of VPCI and VCI for service port and user port Connection establishment and co
34、nnection characteristics negotiation . Modification of traffic parameters Establishment of branches of point-to-multipoint connections . Interworking with ANS not supporting point to multipoint connections Recommendation 6.967.2 (02/99) Page 31 31 31 33 33 33 33 34 36 37 37 37 37 39 40 40 40 40 40 4
35、2 42 42 42 56 61 61 62 63 66 71 72 74 77 79 79 79 V . STD-ITU-T RECMN G-qb7-Z-ENGL 1999 m 48bt591 Obbl1347 917 b 13.6 14 14.1 14.2 14.3 1 3.5.12 B-BCC automatic congestion control functions 13.5.13 Establishment of (semi-)permanent VCCs via the B-BCC protocol . 13.6.1 General principles for the B-BC
36、C procedures 1 3.6.2 Procedures for establishment and release of bearer connections 13.6.3 Procedures specific for point-to-multipoint connections B-BCC communication procedures 13.6.4 B-BCC housekeeping procedures . Message format and codes Message and information element encoding principles . RTMC
37、 protocol messages and information elements B-BCC protocol messages and information elements 14.3.1 Overview of B-BCC protocol messages . 14.3.2 B-BCC messages for the support of basic B-BCC procedures . 14.3.3 B-BCC messages for the support of B-BCC housekeeping procedures . 14.3.4 Additional B-BCC
38、 messages for the support of traffic parameter modification 14.3.5 Additional B-BCC messages for the support of point-to-multipoint connections 14.3.6 B-BCC function specific information elements 14.3.7 B-BCC function information elements based on other Recommendations Annex A . SDL process diagrams
39、 . Appendix I . Intenvorking between B-BCC and DSS2 I . 1 Message interworking Establishment of point-to-point connections . Transfer phase . Release of point-to-point connections . I . 1.1 I . 1.2 I . 1.3 I . 1.4 Successful establishment of point-to-multipoint connections at the terminating AN I .
40、1.5 Release branches of point-to-multipoint connections . 1.1.6 DSS2 Restart . Common use of information elements in DSS2 and VB5.2 . i 1.2.1 Point-to-point connections 1.2.2 Point-to-multipoint connections 1.2 I Appendix II . Support of terminal equipment using the ATM Forum ATM UNI signalling vers
41、ion 4.0 II . 1 Introduction 11.2 Principle differences . Page 81 82 82 82 86 92 95 101 101 101 101 102 104 107 109 112 114 122 124 124 124 126 128 131 132 133 134 134 135 137 138 138 138 Vi Recommendation 6.967.2 (02/99) 11.3 Protocol differences 11.4 Connection control procedures . 11.5 Extensions
42、to B-BCC message format and codes 11.5.1 ALLOC message . 11.5.2 ALLOC-ACC message . 11.5.3 ALLOC-COMP message 11.5.4 Additional B-BCC information elements 11.6 Bibliography . Appendix III . Support of services with susceptibility to clipping . III . 1 111.2 Case of direct access arrangements Case of
43、 remote access arrangements with VB5.2 reference point Appendix IV . Potential optimization of the B-BCC protocol to support switched broadcast services . IV.l General . Architecture . Additional requirements for VB5.2 reference point IV.2.1 Link establishment procedure . IV.2.2 Change branch proced
44、ure Extended B-BCC message format and codes . IV.3.1 Additional B-BCC messages . IV . 1 . 1 IV . 1.2 IV.2 Additional B-BCC procedures . IV.3 IV.3.2 Additional B-BCC information element . IV.4 Bibliography . Appendix V . RTMC and B-BCC system relationship . Page 138 139 139 140 140 140 140 141 141 14
45、1 142 145 145 145 146 147 147 148 149 149 151 152 152 I Recommendation 6.967.2 (02/99) vii - - - STD-ITU-T RECMN G.Sb7nZ-ENGL Iq99 U Y862591 Obb13Y9 2qT Introduction The VB5 reference point concept, based on Recommendations G.902 and 1.414, was split into two variants. The first based on the ATM cro
46、ss-connect with provisioned connectivity, called the VB5.1 reference point, is specified in Recommendation G.967.1. The other, which further enables on-demand connectivity within the AN, is called the VB5.2 reference point and is contained in this Recommendation. Relationship between the VB5.1 and V
47、B5.2 reference point concepts The VB5.2 reference point extends the capabilities at the VB5.1 reference point to include on-demand connectivity in the AN under the control of SN. In addition to the major difference given above, the major correspondence between the VB5.1 and VB5.2 reference points ca
48、n be described as: - both VB5 reference points support B-ISDN as well as narrow-band and other non-B-ISDN customer access types; both VB5 reference points support ATM multiplexingcross-connection in the AN at the virtual path and/or virtual channel level. - Recommendation G.967.2 (0299) . VI11 STD-I
49、TU-T RECMN G-967-2-ENGL 1999 4862591, 0661350 TO1 9 Recommendation G.967.2 V-INTERFACES AT THE SERVICE NODE (SN): VB5.2 REFERENCE POINT SPECIFICATION (Genevu, 1999) 1 Scope This Recommendation specifies the physical, procedural and protocol requirements for interfaces at the VB5.2 reference point between an Access Network (AN) and a Service Node (SN). The VB5.2 reference point provides flexible (provisioned) Virtual Path (VP) link allocation and flexible (provisioned) Virtual Channel (VC) link allocation (controlled by the 43 interfaces) as well as on-demand VC link allocati
