1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E.439 (03/2000) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS Quality of service, network management and traffic engineering - Network management - Checking the q
2、uality of the international telephone service Test call measurement to assess N-ISDN 64 kbit/s circuit-switched bearer service UD1 in ope rat i on ITU-T Recommendation E.439 (Formerly CCITT Recommendation) ITU-T E-SERIES RECOMMENDATIONS OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION
3、 AND HUMAN FACTORS OPERA TION, NUMBERING, ROUTING AND MOBILE SERVICES INTERNATIONAL OPERATION Definitions General provisions concerning Administrations General provisions concerning users Operation of international telephone services Numbering plan of the international telephone service Internationa
4、l routing plan Tones in national signalling systems Maritime mobile service and public land mobile service OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the international telephone service Measuring and recording call durations for acco
5、unting purposes UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON- TE LEP H ONY AP PLI CATI ONS General Phototelegraphy ISDN PROVISIONS CONCERNING USERS QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING NETWORK MANAGEMENT International service statistics International network m
6、anagement - Checking the quality of the international telephone service TRAFFIC ENGINEERING Measurement and recording of traffic Forecasting of traffic Determination of the number of circuits in manual operation Determination of the num ber of circuits in automatic and semi-automatic operation Grade
7、 of service Definitions ISDN traffic engineering Mobile network traffic engineering QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND DEPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services Models for telecommunication services Objectiv
8、es for quality of service and related concepts of telecommunication services Use of quality of service objectives for planning of telecommunication networks Field data collection and evaluation on the performance of equipment, networks and services E. 1 00-E. 103 E.104-E.119 E. 120-E. 139 E. 140-E.
9、159 E. 1 60-E. 1 69 E. 170-E. 179 E. 1 80-E. 1 99 E.200-E.229 E.230-E.249 E.260-E.269 E.300-E.319 E.320-E.329 E. 330-E. 399 E.400-E.409 E.41 0-E.419 E.490-E.505 E.506-E509 E.510-E519 E.520-E539 E.540-E599 E.600-E.699 E.700-E.749 E.750-E.799 E.800-E.809 E.810-E.844 E.845-E.859 E.860-E.879 E.880-E.899
10、 For further details, please rer to ITD-T List of Recommendations. ITU-T RECOMMENDATION E.439 TEST CALL MEASUREMENT TO ASSESS N-ISDN 64 kbith CIRCUIT-SWITCHED BEARER SERVICE UD1 IN OPERATION Summary This Recommendation presents an overview of the operational measurements, defined in Recommendation E
11、.438, that can be performed by test calls and used to assess the performance of N-ISDN 64 kbitls circuit-switched UD1 bearer services. Correspondent measurements (excluding transmission quality measures), performed by exchanges on live traffic, are specified in Recommendation M.3650. These Recommend
12、ations should be used by administrations and by ROAS for monitoring and improvement analysis of ISDN services and networks in operations. The measured values can be used both to set guaranteed performance levels in Service Level Agreement with the customers and Service Quality Agreements with other
13、administrations, and to verify, analyse and improve the performance level currently achieved. Source ITU-T Recommendation E.439 was prepared by ITU-T Study Group 2 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 13 March 2000. Recommendation E.439 (03/2000) i FOREWORD ITU (
14、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 the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Re
15、commendations 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 their turn, produce Recommendations on these t
16、opics. 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-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Re
17、commendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve
18、the use of a claimed Intellectual Property Right. The 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 Reco
19、mmendation, the 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 databa
20、se. o ITU 2000 All rights reserved. No part 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 fi-om the ITU. 11 Recommendation E.439 (03/2000) CONTENTS 1 2 3 4 5 6 7 7.1 7.2 Int
21、roduction . Scope . References . Terms and definitions . Abbreviations and acronyms . General consideration on test call measurement for ISDN . NP/QOS ISDN parameters considered . Test call measurements to assess NP/QOS parameters for ISDN calls using 64 kbitls UD1 single channel . 7.1.1 Call setup
22、phase . 7.1.2 User information transfer phase . 7.1.3 Call disengagement phase Test call measurements and criteria to assess NP parameters for ISDN calls using 64 kbitls UD1 multiple channels . 7.2.1 Assessment of NP/QOS parameters for multi-channel calls . 7.2.2 Specific NP/QOS parameters for multi
23、-channel ISDN communications 8 Consideration on ISDN calls using Primary Rate Interface Annex A . Calculation methods and procedures to derive NP/QOS parameters Annex B . Data collection principles and statistical procedure B . 1 Composition of ISDN speed criterion related performance parameters . B
24、.2 Composition of ISDN dependability criterion related performance parameters . Annex C . Statistical treatment of ISDN NP parameters Recommendation E.439 (03/2000) Page 1 1 2 3 3 4 4 10 10 10 11 11 13 13 14 14 . 111 Introduction ISDN traffic is growing, particularly for access to Internet and to br
25、oadband networks, and for videocommunication services. Standard measurements, as close as possible to those used for PSTN, are needed to monitor the level of performance achieved. This Recommendation describes practical definitions and methods to be used in operation for measuring the performance of
26、 ISDN CSCT 64 kbitls UD1 bearer service on a per-call basis through test call generation. The standard NP/QOS measures and the related definitions and considerations are described in ITU-T Recommendation E.438. Similar measures taken in operation for real traffic are described in ITU-T Recommendatio
27、n M.3650. The list of operational measures and the NP/QOS parameters enabling assessment, by the three performance serveability criteria, of the three communication functions of an ISDN call, are described in clause 7. Remarks on performance of multiple channel calls for ISDN are made in 7.2. Specif
28、ic considerations on ISDN calls using primary rate interface accesses are made in clause 8. Calculation methods and procedures to derive the NP/QOS statistical parameters from the NP measures obtained on a per-call basis are provided in Annex A. In Annex B, data collection principles and statistical
29、 calculation procedures for the same parameters are described. Annex C references statistical procedures to estimate the confidence interval for the performance parameters and compliance testing to verify their acceptability level. iv Recommendation E.439 (03/2000) Recommendation E.439 TEST CALL MEA
30、SUREMENT TO ASSESS N-ISDN 64 kbith CIRCUIT-SWITCHED BEARER SERVICE UD1 IN OPERATION 1 Introduction ISDN traffic is growing, particularly for access to Internet and to broadband networks, and for videocommunication services. Standard measurements, as close as possible to those used for PSTN, are need
31、ed to monitor the level of performance achieved. This Recommendation describes practical definitions and methods to be used in operation for measuring the performance of ISDN CSCT 64 kbitls UD1 bearer service on a per-call basis through test call generation. The standard NP/QOS measures and the rela
32、ted definitions and considerations are described in ITU-T Recommendation E.438. Similar measures taken in operation for real traffic are described in ITU-T Recommendation M.3650. The list of operational measures and the NP/QOS parameters enabling assessment, by the three performance serveability cri
33、teria, of the three communication functions of an ISDN call, are described in clause 7. Remarks on performance of multiple channel calls for ISDN are made in 7.2. Specific considerations on ISDN calls using primary rate interface accesses are made in clause 8. Calculation methods and procedures to d
34、erive the NP/QOS statistical parameters fiom the NP measures obtained on a per-call basis are provided in Annex A. In Annex B, data collection principles and statistical calculation procedures for the same parameters are described. Annex C references statistical procedures to estimate the confidence
35、 interval for the performance parameters and compliance testing to verify their acceptability level. 2 Scope This Recommendation describes methods for assessing in operation the serveability performance of setup, information transfer and disengagement phases of 64 kbitls circuit-switched ISDN connec
36、tions and networks by means of test calls. Methods are given for determining the values of derived performance parameters fiom the primary measurements. The parameters themselves are, for the most part, defined in other Recommendations in the E-, G-, I-, M- and O-series. The methods described in thi
37、s Recommendation are applicable only to the unrestricted digital bearer service accessed via basic rate and primary rate ISDNlJJ94. QOS estimation of teleservices using 64 kbitls UD1 requires the definition of appropriate performance parameters that take account of the effects of terminal equipment
38、on QOS: this is for future study. In some cases, a compromise is necessary between the formal definition of a parameter and the means of measuring it. Where such compromises are required, this Recommendation takes the pragmatic view that a performance parameter is of little value if it cannot be ope
39、rationally measured and its formal definition has been This includes both 64 kbits services and n x 64 kbitsh services. The inclusion of parameters for assessing the information transfer phase of 3.1 kHz audio and the speech bearer services are for further study. Therefore, the performance of mixed
40、connections ISDN t, PSTN are not presently considered. This Recommendation does not consider Dedicated Circuit Connection Type (DCCT) and Packet Switched Connection Type (PSCT). Packet switched ISDN services, teleservices and supplementary services are not within the scope of this Recommendation at
41、present. Recommendation E.439 (03/2000) 1 adjusted accordingly. Additionally, not all parameters reflect the way in which a user might view the QOS of service and the parameters and measurements method described herein are for network assessment only. The mapping of the measurement made with this Re
42、commendation into parameters reflecting the customer view is beyond the scope of this Recommendation and is left to individual ROAS. 3 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommend
43、ation. 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 Recommendations and other refere
44、nces listed below. A list of the currently valid ITU-T Recommendations is regularly published. 2 ITU-T Recommendation E.43 8 (2000), Performance parameters and measurement methods to assess N-ISDN 64 kbith circuit switched bearer service UDI in operation. ITU-T Recommendation M.3650 (1 997), Network
45、 performance measurements of ISDN calls. ITU-T Recommendation E.72 1 (1 999), Network grade of service parameters and target values for circuit-switched services in the evolving ISDN. ITU-T Recommendation 1.350 (1993), General aspects of quality of service and network pe flormance in digital network
46、s, including ISDNs. ITU-T Recommendation 1.352 (1 993), Network peflormance objectives for connection processing delays in an ISDN. ITU-T Recommendation 1.353 (1996), Reference events for deflning ISDN and B-ISDN pe flormance parameters. ITU-T Recommendation 1.355 (1995), ISDN 64 kbith connection ty
47、pe availability pe flormance. ITU-T Recommendation G. 1 14 (1988), Mean one-way propagation time. ITU-T Recommendation G. 82 1 (1 996), Error performance of an international digital connection operating at a bit rate below the primary rate and formingpart of an integrated services digital network. I
48、TU-T Recommendation O. 152 (1 992), Error peflormance measuring equipment for bit rates of 64 kbith and N x 64 kbith. ITU-T Recommendation E.846 (1 993), Accessibility for 64 kbith circuit-switched international end-to-end ISDN connection types. ITU-T Recommendation E.800 (1994), Terms and deflnitio
49、ns related to quality of service and network pe flormance including dependability. ITU-T Recommendation E.820 (1992), Call models for serveability and service integrity pe flormance. ITU-T Recommendation E.425 (1 998), Internal automatic observations. ITU-T Recommendation 1.430 (1 995), Basic user-network inteflace -Layer I speczjkation. ITU-T Recommendation 4.921 (1997), ISDN user-network inteflace - Data link layer specijkation. Recommendation E.439 (03/2000) ITU-T Recommendation 4.93 1 (1998), ISDN user-network interface layer 3 speczjkation for basic call control. ITU-T Recommendation E
