1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Series Q Supplement 25 (I 211 999) SERIES Q: SWITCHING AND SIGNALLING Supplement to the Q.2900=series Recommendations: Broadband integrated services digital network (B-ISDN) - Digital subscriber signalling sy
2、stem No. 2 (DSS2) - User-network interface layer 3 - Overview of B-ISDN DSS2 signalling capabilities ITU-T Q-series Recommendations - Supplement 25 (Formerly CCITT Recommendations) STDOITU-T RECMN SERIES Q SUPP 25-ENGL 1799 E 48b2591 Obdb507 T55 = ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALL
3、ING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 INTERWORKING OF SIG
4、NALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 BROADBAND ISDN INTERNATIONAL AUTOMATIC AND SEMI- AUTOMATIC
5、 WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.1-Q.3 Q.4-Q.59 Q ,604.99 Q.lOO-Q.119 Q. 120-Q.249 Q.250-Q.309 4.3 10-4.399 4.400-4.499 4.600-4.699 Q.700-4.849 Q.SSO-Q.999 Q. 100O-Q. 1099 Q. 1 100-Q. 1 199 Q.1200-Q.1699 Q.1700-4.1799 Q.2000-4.2999 For further details, please refer to the list
6、 of ITU-TRecommendations STD-ITU-T RECMN SERIES Q SUPP 25-ENGL 1779 48b257L Oh8b508 771 Supplement 25 to ITU-T Q-series Recommendations Supplement to the Q.2900-series Recommendations: Broadband integrated services digital network (B-ISDN) - Digital subscriber signalling system No. 2 SS2) - User-net
7、work interface layer 3 - Overview of B-ISDN DSS2 signalling capabilities Summary This Supplement provides an introduction to the capabilities included in the access signalling protocols for the Broadband Integrated Services Digital Network. Included is an overview of the capabilities supported, an i
8、ntroduction to, and index of, Recommendations which provide the detailed protocol descriptions. Source Supplement 25 to ITU-T Q-series Recommendations was prepared by ITU-T Study Group 11 (1997-2000) and approved under the WTSC Resolution 5 procedure on 3 December 1999. Q series - Supplement 25 (12/
9、1999) 1 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 questi
10、ons 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 the topics for study by the ITU-T study groups which, in turn, produce Recommendation
11、s on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSC Resolution 1. In 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 publication, 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 publication may involve the use of a claimed Int
13、ellectual 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 publication development process. As of the date of approval of this publication, ITU had not received n
14、otice of intellectual property, protected by patents, which may be required to implement this publication. 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 2001 All rights reserved. No pa
15、rt 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. 11 Q series - Supplement 25 (12/1999) 1 5 5.1 CONTENTS Scope . References . Abbreviations Description Scope of
16、 each capability . Recommendations for DSS2 signalling capabilities . 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.1.6 5.1.7 5.1.8 5.1.9 5.1.10 5.1.11 5.1.12 5.1.13 5.1.14 5.1.15 Basic callkonnection control . Additional Traffic Parameters . Connection characteristics negotiation during call set-up . Connection
17、characteristics modification Network look ahead . Point-to-multipoint connection control . Generic functional protocol . Signalling specification for Frame relay . Call pnonty Generic identifier transport Switched Virtual Path Support of Quality of Service Multiconnection . Supplementary Services .
18、Testing . 5.2 Capability dependencies . Annex A - List of Recommendations for DSS2 signalling capabilities and testing Q series . Supplement 25 (12/1999) Page 1 1 1 3 3 3 3 4 4 5 5 5 6 6 6 6 7 7 7 8 10 11 12 . 111 Supplement 25 to ITU-T Q-series Recommendations Supplement to the Q.2900-series Recomm
19、endations: Broadband integrated services digital network (B-ISDN) - Digital subscriber signalling system No. 2 (DSS2) - User-network interface layer 3 - Overview of B-ISDN DSS2 signalling capabilities 1 Scope This Supplement contains an overview and scope of the signalling capabilities contained in
20、Recommendations for the B-ISDN User-Network Interface. Details of those Capabilities are provided within the specific Recommendations summarized within clause 5. 2 References The following Technical Reports and other references contain provisions which, through reference in this text, constitute pro
21、visions of this Supplement. At the time of publication, the editions indicated were valid. All supplements and other references are subject to revision; all users of this Supplement are therefore encouraged to investigate the possibility of applying the most recent edition of the supplements and oth
22、er references listed below. A list of the currently valid ITU-T Recommendations and supplements is regularly published. 13 ITU-T Recommendation 1.356 (2000), B-ISDN ATM layer cell transfer performance. 2 ITU-T Recommendation 1.371 (2000), Trafzc control and congestion control in B-ISDN. 3 ITU-T Reco
23、mmendation X.2 19 (1 988), Remote operations: Model, notation and service definition. 4 ITU-T Q-series Recommendations - Supplement 7 (1999), Technical Report TRQ.2001: General aspects for the development of uni9ed signalling requirements. 3 Abbreviations This Supplement uses the following abbreviat
24、ions: ABR Available Bit Rate ABT ATM Block Transfer AESA ATM End System Address ATM Asynchronous Transfer Mode ATS Abstract Test Suite BC Bearer Control (Connection Control) BCOB Broadband Connection-Oriented Bearer I B-ISDN Broadband Integrated Services Digital Network I cc Call Control CDVT Cell D
25、elay Variation Tolerance CLIP Calling Line Identification Presentation CLIR Calling Line Identification Restriction Q series - Supplement 25 (12/1999) 1 CLP COLP COLR CUG DDI DLCI DSS2 FR IP ISDN MBS MCR MPOA MSN N-BC “I PCR PICS PIXIT QOS RM ROSE SBR SCR sscs SUB TP TSS UNI uus VPN Cell Loss Priori
26、ty Connected Line Identification Presentation Connected Line Identification Restriction Closed User Group Direct-Dialling In Data Link Connection Identifier Digital Subscriber Signalling System No. 2 Frame Relay Internet Protocol Integrated Services Digital Network Maximum Burst Size Minimum Cell Ra
27、te Multiprotocol encapsulation Over ATM Multiple Subscriber Number Narrowband Bearer Capability Network Node Interface Peak Cell Rate Protocol Implementation Conformance Statement Protocol Implementation extra Information for Testing Quality of Service Resource Management Remote Operations Service E
28、lement Statistical Bit Rate Sustainable Cell Rate Service Specific Convergence Sublayer Sub-addressing Test Purpose Test Suite Structure User Network Interface User-to-User Signalling Virtual Private Network 2 Q series - Supplement 25 (12/1999) STD-ITU-T RECMN SERIES Q SUPP 25-ENGL L999 m Li8b259L O
29、bb5L3 259 W 4 Description This Supplement provides an overview of the DSS2 signalling capabilities and related testing recommendations, as follows: basic call/connection control; additional traffic parameters; connection characteristics negotiation; connection characteristics modification; network l
30、ook ahead; point-to-multipoint connection control; generic functional protocol (allowing the support of supplementary services and other features) ; fiame relay support; call priority; generic identifier transport (the transport through the network of identifiers used by various distributed applicat
31、ions); switched virtual path; signalling support for quality of service; multiconnection call support: separated call control; eparated bearer control; onnection pre-negotiation; signalling for supplementary services; testing. Recommendations for DSS2 signalling capabilities Scope of each capability
32、 This clause clarifies the scope of the capabilities. 5.1.1 Basic caWconnection control Recommendation Q.293 1 specifies the procedures for the establishing, maintaining and clearing of network connections at the B-ISDN user network interface. The procedures are defined in terms of messages exchange
33、d and specifies the layer 3 callhonnection states, messages, information elements, timers and procedures used for the control of B-ISDN point-to-point on-demand calls on virtual channels. Recommendation 4.293 1, and its amendments 1 to 4, is intended to speciQ the essential features, procedures and
34、messages required for call/connection control. However, there are some details of procedure which are not specified, and other Recommendations use additional messages, additional operations (using Facility information element), additional information elements and/or modification of existing informat
35、ion elements to support additional capabilities in DSS2. Q series - Supplement 25 (12/1999) 3 STDeITU-T RECHN SERIES Q SUPP 25-ENGL 1779 m 4b257L ObBb5L4 195 5.1.2 Additional Traffic Parameters The release 1 basic callconnection control (see Recommendation 4.293 1) enables the signalling of connecti
36、on control with resourcehandwidth allocation based on peak cell rate PCR. Additional capabilities are defined in Recommendation Q.296 1 to enable connection control and resourcehandwidth allocation to support communication between users using a Broadband Connection-Oriented Bearer Service (BCOB). Th
37、e capabilities are defined in parts of Recommendation 4.2961, which is a multipart Recommendation, supporting a set of traffic control and congestion control as defined in Recommendation 1.371 2. Part 1 covers only the additional parameters required for the support of the tagging option and the supp
38、ort of Sustainable Cell Rate (SCR) parameter set. Part 2 specifies the revised coding of the 4.2931 Broadband bearer capability information element specifically to enable the identification of the ATM transfer capability. Part 3 defines the additional traffic parameters required for the support of t
39、he Available Bit Rate (ABR) ATM transfer capability. Available Bit Rate ABR refers to an ATM transfer capability where the limiting ATM layer transfer characteristics provided by the network may change subsequent to connection establishment. It is expected that a user which adapts its traffic to the
40、 changing ATM layer transfer characteristics will experience a low cell loss ratio. This Recommendation includes the use of the DSS2 signalling procedures for the negotiation of Minimum Cell Rate (MCR) during call establishment. ABR precludes use of DSS2 signalling procedures for the modification of
41、 traffic parameters during the active phase of the call. Part 4 defines the additional traffic parameters required for the support of the ATM Block Transfer (ABT) ATM transfer capability. Part 4 includes the use of the DSS2 signalling procedures for the negotiation of Peak Cell Rate (PCR), Sustainab
42、le Cell Rate (SCR), Maximum Burst Size (MBS) and Resource Management (RM) peak cell rate traffic parameters during call establishment. ABT precludes use of the DSS2 signalling procedures for the modification of traffic parameters during the active phase of the call. Part 5 defines the signalling cap
43、abilities to support the Cell Delay Variation Tolerance (CDVT) indications at call/connection establishment time for Peak Cell Rate with CLP = O + 1, for the Sustainable Cell Rate with CLP = O + 1, for the Sustainable Cell Rate with CLP = O and for the Resource Management peak cell rate, consistentl
44、y with the traffic management features and requirements. Part 6 defines the ATM transfer capabilities to enable the call requesting user to invoke calUconnection establishment between users using a connection for which the Statistical Bit Rate configuration 2 or 3 (SBR2 or SBR3) ATM transfer capabil
45、ity is applied by the network. 5.1.3 Recommendation 4.2962 specifies the signalling protocol to negotiate the cell rate traffic parameters that are specified in Recommendations 4.293 1 and 4.2961 for basic call/connection control. The capability described in Recommendation 4.2962 is also applicable
46、for negotiating the connection characteristics for the first party of a point-to-multipoint call/connections as specified in Recommendation 4.297 1. The capabilities in 4.2962 are only applicable during the call/connection establishment phase. acceptable ATM traffic descriptor information element ar
47、e used to allow negotiation of any relevant traffic parameters (i.e. peak cell rate, sustainable cell rate and maximum burst size parameters, depending on the ATM transfer capability actually used for the connection). Connection characteristics negotiation during call set-up I l Both the use of an a
48、lternative ATM traffic descriptor information element and a minimum I l 4 Q series - Supplement 25 (12/1999) - STD-ITU-T RECMN SERIES Q SUPP 25-ENGL 1999 48b2591 ObBb515 021 5.1.4 Connection characteristics modification Recommendation 4.2963 is a multipart Recommendation that enables the modificatio
49、n of the characteristics of an established connection. Part 1 specifies the signalling protocol for modification of the peak cell rate under the control of the user (currently the connection owner, who is the user who initiated the call/connection establishment). It is the initial Recommendation in a family of Recommendations that concern the modification of ATM traffic parameter. Peak cell rate modification is applicable to all connection oriented telecommunication services that are based on single point-to-point calls/connections. The peak cell rate modi
