ITU-T X 142-2003 Quality of service metrics for characterizing Frame Relay ATM service interworking performance SERIES X DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS Public data ne.pdf
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1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T X.142TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2003) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS Public data networks Network aspects Quality of service metrics for characterizing Frame Relay/ATM service interworking performance ITU-T
2、 Recommendation X.142 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS Services and facilities X.1X.19 Interfaces X.20X.49 Transmission, signalling and switching X.50X.89 Network aspects X.90X.149 Maintenance X.150X.179 Administrative arrangements X.18
3、0X.199 OPEN SYSTEMS INTERCONNECTION Model and notation X.200X.209 Service definitions X.210X.219 Connection-mode protocol specifications X.220X.229 Connectionless-mode protocol specifications X.230X.239 PICS proformas X.240X.259 Protocol Identification X.260X.269 Security Protocols X.270X.279 Layer
4、Managed Objects X.280X.289 Conformance testing X.290X.299 INTERWORKING BETWEEN NETWORKS General X.300X.349 Satellite data transmission systems X.350X.369 IP-based networks X.370X.399 MESSAGE HANDLING SYSTEMS X.400X.499 DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Effi
5、ciency X.630X.639 Quality of service X.640X.649 Naming, Addressing and Registration X.650X.679 Abstract Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT Systems Management framework and architecture X.700X.709 Management Communication Service and Protocol X.710X.719 Structure of Management Info
6、rmation X.720X.729 Management functions and ODMA functions X.730X.799 SECURITY X.800X.849 OSI APPLICATIONS Commitment, Concurrency and Recovery X.850X.859 Transaction processing X.860X.879 Remote operations X.880X.899 OPEN DISTRIBUTED PROCESSING X.900X.999 For further details, please refer to the li
7、st of ITU-T Recommendations. ITU-T Rec. X.142 (10/2003) i ITU-T Recommendation X.142 Quality of service metrics for characterizing Frame Relay/ATM service interworking performance Summary This Recommendation defines quality of service metrics for characterizing performance in the case of FR/ATM serv
8、ice interworking. The specified metrics can be used to quantify the performance of either the FR/ATM interworking function/unit or the quality of the end-to-end data connection. This Recommendation is complementary to ITU-T Rec. X.140 as it is a specific case of the general techniques described ther
9、ein for assessing performance. The specified metrics allow users and network operators to assess the performance from a user perspective. The metrics provide a simple manner by which either users or network operators could characterize the end-to-end performance. The defined metrics are not intended
10、 to be a replacement for the frame layer or ATM layer primary performance parameters but can be used to provide a user-oriented perspective of end-to-end performance. Source ITU-T Recommendation X.142 was approved by ITU-T Study Group 17 (2001-2004) under the ITU-T Recommendation A.8 procedure on 29
11、 October 2003. ii ITU-T Rec. X.142 (10/2003) 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 t
12、echnical, 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), which meets every four years, establishes the topics for study by the ITU-T study groups whi
13、ch, 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 ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and
14、 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 Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to
15、 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“ and the negative equivalents are used to express requirements. The use of such words d
16、oes 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 involve the use of a claimed Intellectual Property Right. ITU takes no position concern
17、ing 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, ITU had not received notice of intellectual property, protected by pate
18、nts, 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. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any
19、 means whatsoever, without the prior written permission of ITU. ITU-T Rec. X.142 (10/2003) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations 2 5 Conventions 2 6 General reference model for FR/ATM service interworking . 3 7 Metrics for characterizing FR/ATM service interwork
20、ing performance 4 7.1 Data block delivered ratio/loss ratio. 4 7.2 Data block transfer delay 4 7.3 Data block delay jitter 5 8 Formal relationships between frame level and ATM level performance and traffic parameters. 5 9 Performance objectives. 5 Appendix I Estimation of loss and transit delay in t
21、he case of FR/ATM service interworking 6 I.1 Introduction 6 I.2 Estimation of end-to-end transit delay . 6 I.3 Estimation of data block loss ratio . 6 ITU-T Rec. X.142 (10/2003) 1 ITU-T Recommendation X.142 Quality of service metrics for characterizing Frame Relay/ATM service interworking performanc
22、e 1 Scope The purpose of this Recommendation is to define metrics for characterizing frame relay/ATM service interworking performance. This Recommendation is complementary to ITU-T Rec. X.140 as it is a specific case of the general techniques described in ITU-T Rec. X.140 for assessing performance.
23、Due to the intrinsic differences in the FR and ATM protocols, it is difficult, particularly from a user perspective, to directly map the performance parameters of one technology to the other in order to quantify the end-to-end performance in the case of FR/ATM service interworking. Since FR frames c
24、an be of varying length, the loss of one frame may translate into the loss of more than one cell. Also the transit delay of frames across a network will generally be longer than for ATM cells due to increased clocking and switching delays associated with larger frame sizes. The purpose of defining m
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