1、CCITT RECNN*E.YSO 92 W 4Bb259L 0573605 534 INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING E.490 TRAFFIC MEASUREMENT AND EVALUATION - GENERAL SURVEY
2、Recommendation E.490 Geneva, 1992 INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING E.490 TRAFFIC MEASUREMENT AND EVALUATION - GENERAL SURVEY Recommend
3、ation E.490 Geneva, 1992 FOREWORD The CC (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union 0. CC is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to
4、 standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCIIT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCIIT between Plenary Assemblies is covere
5、d by the procedure laid down in CCIT Resolution No. 2 (Melbourne, 1988). Recommendation E.490 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 16th of June 1992. CCII NOTE In this Recommendation, the expression “Administration” is used for conciseness to in
6、dicate both a telecommunication Administration and a recognized private operating agency. O IT 1992 Ail 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 writin
7、g from the ITU. I Recommendation E.490 In the loop which takes weeks, days or hours to go through, there is also a strong demand on continuous measurements so faults disturbing traffic could be discovered and correlated, and appropriate maintenance or I engineering actions could be taken. TRAFFIC ME
8、ASUREMENT AND EVALUATION - GENERAL SURVEY 1 Introduction For planning and operating telecommunication networks it is important to have a good knowledge of the traffic in the network. The size of the tr planning and reconfiguration. The most important of such factors are: - tariffpolicy; - commercial
9、 agreements; - strategical objectives. Recommendation E.490 1 ._ - - _ CCITT RECMN*E-490 92 4862593 0573609 LBT W Telecommunication networks II I I II T - 1 -b Traffic measurement - Minutes, seconds i Network trac Traffic and management actions fault analysis Weeks, days, hours reconfiguration fault
10、 analysis I Year, months I 4 Traffic analysis compilation forecasting Network extensions T02Q2010-90 FIGURE 11E.490 Use of trame measurements in planning and operating telecommunication networks Traffic measurement can serve other activities than those connected with the planning and operation of th
11、e network itself, such as marketing, setting of tariffs and revenue analysis. This use of traffic measurement is not taken up here. 4 Measurement principles and evaluation Measurement methods and evaluation procedures for traffic data to be used mainly for long-term network planning (loop in Figure
12、1E.490 with the time scale of year, months) are given in Recommendation E.500. Methods and applications of trafW measurements on a destination basis are handled in Recommendation E.491. The traflc measurement requirements for digital telecommunications exchanges are accounted for in Recommendation E
13、.502. The requirements relate to all three loops in Figure 1E.490, and are based on a traffk measurement model as defined in this Recommendation. Measurements of the performance of common channel signalling networks are recommended in E.505. Administration of scheduling and ordering of traffk measur
14、ements and control of traffic data collection is handled in Recommendation E.504. Models and procedures for analysis of recorded traffk data are to be found in Recommendation E.503. 2 Recommendation E.490 - CCITT RECMN*E.490 92 m 4Bb2591 O573630 9TL m Procedures for estimating offered traffk in a ne
15、twork from observed traffic data are given in Recommendation E.501. in Recommendation E.523, standard daily raffk profdes are given, to be used in lack of measurements. For traffic measurement principles and calculation procedures for the near real time perspective, reference is made to the EAlO-Ser
16、ies Recommendations on network traffk management. Up to now, for the medium time scale (weeks, days, hours) no specific Recommendations have been developed. However, it should be observed that representative traffic values for this time scale should be statistically consistent with the traffk values
17、 for long-term network planning. 5 Applications of traffic measurement For use of traffic measurements for forecasting purposes, reference is made to Recommendations ES06 to E.508. Applications of traffic measurements in engineering network extensions are handled in the E.510- and E.520-Series Recom
18、mendations. Use of traffic measurement for network management actions is handled in the E.410-Series Recommendations. Use of traffic measurement has been classified according to the time frame for using observed traffic data for network actions. It should be pointed out that in Recommendation E.503
19、another type of classifying is used, namely according to the measurement basis (objects), e.g. circuit groups. Note - Although the Recommendations mentioned here are developed on the experiences of public switched telephone network (PSTN), they may also apply to other switched networks. Recommendation E.490 3
