1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T I.358TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2003) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Overall network aspects and functions Performance objectives Call processing performance for switched virtual channel connections (VCCs) in a B-IS
2、DN ITU-T Recommendation I.358 ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK GENERAL STRUCTURE Terminology I.110I.119 Description of ISDNs I.120I.129 General modelling methods I.130I.139 Telecommunication network and service attributes I.140I.149 General description of asynchrono
3、us transfer mode I.150I.199 SERVICE CAPABILITIES Scope I.200I.209 General aspects of services in ISDN I.210I.219 Common aspects of services in the ISDN I.220I.229 Bearer services supported by an ISDN I.230I.239 Teleservices supported by an ISDN I.240I.249 Supplementary services in ISDN I.250I.299 OV
4、ERALL NETWORK ASPECTS AND FUNCTIONS Network functional principles I.310I.319 Reference models I.320I.329 Numbering, addressing and routing I.330I.339 Connection types I.340I.349 Performance objectives I.350I.359 Protocol layer requirements I.360I.369 General network requirements and functions I.370I
5、.399 ISDN USER-NETWORK INTERFACES Application of I-series Recommendations to ISDN user-network interfaces I.420I.429 Layer 1 Recommendations I.430I.439 Layer 2 Recommendations I.440I.449 Layer 3 Recommendations I.450I.459 Multiplexing, rate adaption and support of existing interfaces I.460I.469 Aspe
6、cts of ISDN affecting terminal requirements I.470I.499 INTERNETWORK INTERFACES I.500I.599 MAINTENANCE PRINCIPLES I.600I.699 B-ISDN EQUIPMENT ASPECTS ATM equipment I.730I.739 Transport functions I.740I.749 Management of ATM equipment I.750I.759 Multiplexing aspects I.760I.769 For further details, ple
7、ase refer to the list of ITU-T Recommendations. ITU-T Rec. I.358 (09/2003) i ITU-T Recommendation I.358 Call processing performance for switched virtual channel connections (VCCs) in a B-ISDN Summary This Recommendation defines performance parameters and objectives for call processing in B-ISDNs for
8、 switched Virtual Channel Connections (VCCs). The B-ISDN call processing parameters defined in this Recommendation are applicable to point-to-point (Type 1) and point-to-multipoint (Type 2) connection topologies. The QoS relevant network performance objectives provided in this Recommendation are bas
9、ed on the general principles and generic performance parameters of ITU-T Rec. I.350. New performance-related aspects, associated with B-ISDN call processing functions providing access or disengagement, include the addition or release of a party to an existing B-ISDN connection. In a B-ISDN, a virtua
10、l connection can generally be either a Virtual Channel Connection (VCC) or a Virtual Path Connection (VPC). Since call processing capabilities are currently defined only for VCCs, a virtual connection within the context of this Recommendation is a VCC. Source ITU-T Recommendation I.358 was approved
11、by ITU-T Study Group 13 (2001-2004) under the ITU-T Recommendation A.8 procedure on 13 September 2003. ii ITU-T Rec. I.358 (09/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standar
12、dization Sector (ITU-T) is a permanent organ of ITU. 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 Assembly (WTSA), whic
13、h meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on 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 IT
14、U-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendatio
15、n is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must
16、“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may
17、 involve the use of a claimed 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
18、 Recommendation, ITU had not received 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 datab
19、ase. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. I.358 (09/2003) iii CONTENTS Page 1 Scope 1 1.1 Bearer services 2 1.2 Purpose of this Recommendation. 2 2 References. 2 3 Abbreviations 3
20、 4 Reference model . 4 4.1 Reference configuration . 5 4.2 Reference events. 6 4.3 Future reference events. 8 4.4 Assumptions for establishing objectives 8 4.5 Performance objective for delay parameters 9 4.6 Alternate specification of objectives 9 5 Call processing delays for a Type 2 B-ISDN call.
21、9 5.1 Call establishment delays . 10 5.2 Call disengagement delays . 16 6 Incorrect processing parameters . 22 6.1 Connection, party and multi-party call set-up error probabilities 22 6.2 Connection and party premature disconnect 25 7 Denial parameters . 26 7.1 Connection/party set-up denial paramet
22、ers 26 7.2 Connection/party clearing failure probability 28 Annex A Call set-up timers. 29 Appendix I Hypothetical reference connection 30 Appendix II Delay of elements . 32 II.1 Proposal 32 II.2 Outgoing link delay Tod. 32 II.3 Cross-office handling time Tch 33 II.4 Functional reference points 33 I
23、I.5 Reasons for the above proposal 33 II.6 Objectives for cross-office handling time Tch . 34 ITU-T Rec. I.358 (09/2003) 1 ITU-T Recommendation I.358 Call processing performance for switched virtual channel connections (VCCs) in a B-ISDN 1 Scope This Recommendation defines performance parameters and
24、 objectives for call processing in B-ISDNs. The B-ISDN call processing parameters defined in this Recommendation are applicable to point-to-point (Type 1) and point-to-multipoint (Type 2) connection topologies. Call processing delay parameters for point-to-point, single connection calls on 64 kbit/s
25、 channels are defined in ITU-T Rec. I.352. These parameters are used where relevant. Additional call processing performance parameters are defined for those call processing aspects that are new with B-ISDN. The parameters include QoS relevant network performance parameters (objectives) and the relat
26、ionship to GOS parameters relevant to network design (no objectives) in order to provide a consistent approach between service requirements and network design. These parameters are specified in terms of reference events and measurement points defined in ITU-T Rec. I.353. The QOS relevant network per
27、formance objectives provided in this Recommendation are based on the general principles and generic performance parameters of ITU-T Rec. I.350. According to these principles, performance parameters are established to characterize each call processing aspect that is new for B-ISDN with respect to the
28、 three generic performance criteria of speed, accuracy and dependability. The new performance-related aspects, associated with B-ISDN call processing functions providing access or disengagement, are the addition or release of a party to an existing B-ISDN connection. In a B-ISDN, a virtual connectio
29、n can generally be either a Virtual Channel Connection (VCC) or a Virtual Path Connection (VPC). Since call processing capabilities are currently defined only for VCCs, a virtual connection within the context of this Recommendation is a VCC. Table 1 illustrates the application of the three generic p
30、erformance criteria to each of the four new call processing functions that can be invoked for a B-ISDN call. The parameters defined in this Recommendation are applicable only when the network is available. The availability of the network is the subject of another Recommendation. Table 1/I.358 Generi
31、c performance criteria for B-ISDN call processing functions Call processing function Speed Accuracy Dependability 1) Connection set-up Connection set-up delay Connection post selection delay (Note 1) Connection answer signal delay (Note 1) Connection set-up error probability Connection set-up failur
32、e probability 2) Party set-up Party set-up delay Party post selection delay (Note 1) Party answer signal delay (Note 1) Party set-up error probability Party set-up failure probability 3) Connection disengagement Connection disconnect delay Connection release delay (Note 2) Connection premature disco
33、nnect probability Connection clearing failure probability 4) Party disengagement Party disconnect delay Party release delay (Note 2) Party premature disconnect probability Party clearing failure probability NOTE 1 These parameters are defined for traffic engineering; objectives are not set for netwo
34、rk performance. NOTE 2 These parameters have local significance only; objectives will not be set. 2 ITU-T Rec. I.358 (09/2003) 1.1 Bearer services The set of bearer services covered by this Recommendation are those based upon switched virtual connections having: Type 1 or Type 2 topologies; ATM leve
35、l traffic descriptors that can be communicated using the established signalling elements of ITU-T Rec. Q.2971; and ATM level QoS needs that can be communicated using the established signalling elements. 1.2 Purpose of this Recommendation The purpose of this Recommendation is to define performance pa
36、rameters and objectives for call processing in B-ISDNs. The current issue of this Recommendation is limited to Type 1 (point-to-point) and Type 2 (point-to-multipoint) connection topologies with single party add/drop. Additional capabilities such as multiple connection calls and modification of conn
37、ection characteristics are for further study. Quality of Service information should be provided to the users after mapping network performance into user-oriented expressions. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this tex
38、t, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition o
39、f the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 1 ITU-T Recommendation I.352 (1993)
40、, Network performance objectives for connection processing delays in an ISDN. 2 ITU-T Recommendation I.353 (1996), Reference events for defining ISDN and B-ISDN performance parameters. 3 ITU-T Recommendation I.350 (1993), General aspects of quality of service and network performance in digital netwo
41、rks, including ISDNs. 4 ITU-T Recommendation Q.2971 (1995), Digital Subscriber Signalling System No. 2 User-network interface layer 3 specification for point-to-multipoint call/connection control. 5 ITU-T Recommendation Q.2762 (1999), General functions of messages and signals of the B-ISDN User Part
42、 (B-ISUP) of Signalling System No. 7. 6 ITU-T Recommendation Q.2931 (1995), Digital Subscriber Signalling No. 2 User-Network Interface (UNI) layer 3 specification for basic call/connection control. 7 ITU-T Recommendation Q.2761 (1999), Functional description of the B-ISDN user part (B-ISUP) of signa
43、lling system No. 7. 8 ITU-T Recommendation Q.2650 (1999), Interworking between signalling system No. 7 Broadband ISDN User Part (B-ISUP) and digital subscriber signalling system No. 2 (DSS2). 9 ITU-T Recommendation Q.2763 (1999), Signalling System No. 7 B-ISDN User Part (B-ISUP) Formats and codes. I
44、TU-T Rec. I.358 (09/2003) 3 10 ITU-T Recommendation I.356 (2000), B-ISDN ATM layer cell transfer performance. 11 CCITT Recommendation E.721 (1999), Network grade of service parameters and target values for circuit-switched services in the evolving ISDN. 12 ITU-T Recommendation Q.766 (1993), Performa
45、nce objectives in the integrated service digital network application. 13 ITU-T Recommendation Q.706 (1993), Message transfer part signalling performance. 14 ITU-T Recommendation Q.2110 (1994), B-ISDN ATM adaptation layer Service specific connection oriented protocol (SSCOP). 3 Abbreviations This Rec
46、ommendation uses the following abbreviations: AAL ATM Adaptation Layer ACM Address Complete Message ANM Answer Message AP Add Party ATM Asynchronous Transfer Mode B-ISDN Broadband ISDN B-ISUP Broadband ISDN Signalling User Part CASD Connection Answer Signal Delay CCFP Connection Clearing Failure Pro
47、bability CDD Connection Disconnect Delay CP-AAL Common Part AAL CPE Customer Premises Equipment CPSD Connection Post Selection Delay CRD Connection Release Delay CSD Connection Set-up Delay CSFP Connection Set-up Failure Probability FFS For Further Study GOS Grade of Service HRX Hypothetical Referen
48、ce Connection IAM Initial Address Message IIP International Interoperator Portion INI Inter-Network Interface ISC International Switching Centre ISDN Integrated Service Digital Network ITP International Transit Portion 4 ITU-T Rec. I.358 (09/2003) ITU-T International Telecommunication Union Telecomm
49、unication Standardization Sector MPI Measurement Point International MPT Measurement Point Terminal MSU Message Signal Unit NNI Network-Node Interface PASD Party Answer Signal Delay PCFP Party Clearing Failure Probability PDD Party Disconnect Delay PH PHysical layer PPSD Party Post Selection Delay PRD Party Release Delay PSD Party Set-up Delay PSFP Party Set-up Failure Probability QoS Quality of Service RE Reference Event REL Release SSCF Service Specific Coordination Function SSCOP Service Specific Conn
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