ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis

pdf标准 ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis

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ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis 第 1 页 ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis 第 2 页 ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis 第 3 页 ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis 第 4 页 ITU-T E.421-1988 基于统计学的服务质量监视 Service quality observations on a statistical basis 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,基于,统计,统计学,服务,质量,服务质量,监视,service,quality,observations,on,statistical,basis

INTERNATIONAL TELECOMMUNICATION UNION )45 4 % TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 4%,%0(/.% .%47/2+ !.$ )3$. 15!,)49 /& 3%26)#% .%47/2+ -!.!'%-%.4 !.$ 42!&&)# %.').%%2).' 3%26)#% 15!,)49 /"3%26!4)/.3 /. ! 34!4)34)#!, "!3)3 )45 4 Recommendation % (Extract from the "LUE "OOK) NOTES 1 ITU-T Recommendation E.421 was published in Fascicle II.3 of the Blue Book. This file is an extract from the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, the contents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below). 2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1988, 1993 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 from the ITU. Recommendation E.421 Fascicle II.3 - Rec. E.421 SERVICE QUALITY OBSERVATIONS ON A STATISTICAL BASIS 1 Definitions 1.1 service observation F: observation de la qualité de service S: observación de la calidad del servicio Monitoring to obtain a complete or partial assessment of the quality of telephone calls, excluding test calls. 1.2 manual observation F: observation manuelle S: observación manual Monitoring of telephone calls by an observer without using any automatic data-recording machine. 1.3 automatic observation F: observation automatique S: observación automática Monitoring of telephone calls without an observer. 1.4 semi-automatic observation F: observation semi-automatique S: observación semiautomática Monitoring of telephone calls using equipment which records some data automatically. For example, equipment in which information, such as exchange being observed, number dialled by the subscriber, metering pulses and time of call, is recorded automatically on some means suitable for data processing. The observer merely has to key in a code indicating the condition observed. 2 Relative merits of manual, automatic and semi-automatic observations 2.1 The three methods mentioned above in §§ 1.2, 1.3 and 1.4 are not exclusive; for example, automatic observations may be used to supplement observations taken by an operator. It was considered in 1968 that the need for automatic observations would increase in view of the heavy cost associated with manual or semiautomatic observations on the rapidly expanding international network. It was also considered that automatic observations would not entirely supersede observations taken by an observer within the foreseeable future. The relative merits of the three methods can be assessed as follows: 2.2 Manual observation Provides all the data required in Tables 1/E.422 and 1/E.423. Observations can be carried out with a minimum of equipment. Observations can permit the detection of a number of abnormalities which cannot be detected automatically, e.g. very poor speech transmission (item 5.2 of Table 1/E.422), or difficulty with audible tones encountered in the international service (item 6.4 of Table 1/E.422). 2.3 Semi-automatic observation Provides all the data required in Tables 1/E.422 and 1/E.423. There is a saving in staffing costs compared with manual observation. Fascicle II.3 - Rec. E.421 1 Greater accuracy compared with manual observation is possible due to the fact that there is an automatic recording of the number dialled, the time of the call, etc. It is possible for the observer to devote greater attention to the more critical conditions being checked during observations of calls. The results are produced in a form suitable for subsequent mechanized analysis. Owing to the reduction of costs it is possible to obtain a larger sample for the same expenditure. Semi-automatic equipment may be converted, during certain hours of the day, to automatic operation. 2.4 Automatic observation Operating cost is minimum (staff reduction). Continuous observation is possible. It is possible to have a larger sample. Human error is eliminated. Automatic processing of data is facilitated. Conversational privacy is ensured. Control of the time at which observations are made is facilitated. Some of the differences between internal and external automatic observations are given below: 2.4.1 Internal automatic observations can be made in the switching centre itself, on the incoming side or the outgoing side or in between, according to the way the switching centre is engineered: a) Only line signals, such as seizure, answer, etc. can be monitored, and also register signals as long as they do not pass through the exchange i

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