IEEE Std 973-1990 IEEE Standard Definitions of Switching System Performance in a Telecommunications Environment.pdf
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1、h IEEE Standard Definitions of Switching System Performance in a Telecommunications Environment Communications Technology Sponsored by the Switching Committee of the IEEE Communications Society Authorized licensed use limited to: Tsinghua University Library. Downloaded on December 25,2010 at 12:48:1
2、7 UTC from IEEE Xplore. Restrictions apply. IEEE std 973-1990 IEEE Standard Definitions of Switching System Performance in a Telecommunications Environment Sponsor SWitchingCommittee o f the IEEE Communications society Approved February 15,1990 rEm3standardsBoard Abstract: IEEE Std 973-1 990, IEEE S
3、tandard Definitions of Switching System Performance in a Telecommunications Environment, addresses 35 performance parameters for a telecommunica- tions switching system. The parameters encompass factors that affect system operations, admin- istration, and maintenance, as well as customer service. Th
4、ey are generic and are formulated from the point of view of the user. Copyright 0 1990 by The Institute of Electrical and Electronics Engineers, Inc. 345 East 47th Street, New York, NY 10017-2394, USA No part of this publication may be reproduced in any form, in an electronic retrieval system or oth
5、erwise, without the prior written permission of the publisher. Authorized licensed use limited to: Tsinghua University Library. Downloaded on December 25,2010 at 12:48:17 UTC from IEEE Xplore. Restrictions apply. IEEE Standards documents are developed within the Technical Committees of the IEEE Soci
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15、oes it as- sume any obligation whatever to parties adopting the standards ldocuments. Authorized licensed use limited to: Tsinghua University Library. Downloaded on December 25,2010 at 12:48:17 UTC from IEEE Xplore. Restrictions apply. Foreword (This foreword is not a part of IEEE Std 973-1990, IEEE
16、 Standard Definitions of Switching System Performance in a Telecommunications Environment). This standard is prepared in conformance with the IEEE Standards Manual of December 1982 and defines performance in accordance with parameters used in the North American telephone network. This standard addre
17、sses 35 performance parameters for a telecommunications switching sys- tem. They encompass factors that affect system operations, administration, and maintenance, as well as customer service. They are generic (independent of design or implementation of the switching system). They are formulated from
18、 the point of view of the user, looking at the reactions expected by a customer or an administrator. The telecommunications field is expanding rapidly. Parameters covering new services such as ISDN, broadband, and packet switching have not been fully established. Many parameters in this standard are
19、 broad enough to define performance in a new telecommunications service. Others are limited primarily to traditional voice Public Telephone Service or analog services. The definitions are organized according to groups that have a similar impact on the user. If they are alphabetized, then their categ
20、ory should be noted. “Performance” includes both service stan- dards and reliability. Service standards generally apply to elements of a switching system that are engineered as the load on the system changes or growth occurs. Reliability generally applies to the inherent design and manufacture of a
21、system to minimize internal failures and their impact on the customer. Although the confidence of analysis may vary considerably between software and hardware problems, the reliability parameters do not distinguish between the two, and the boundaries chosen should apply to both. Each parameter is de
22、scribed in detail, its dimensions and constraints defined. However, nu- merical values are omitted. The actual numerical values can vary from one network to another. They may be allocated among network elements in different ways, and the needs of customers dif- fer for different applications. This s
23、tandard was authorized July 27, 1982, as Project 973. It was prepared by the Switching Performance Standards Subcommittee of the IEEE Communications Switching Committee. Suggestions for improvement of this standard are welcome. Members of the subcommittee are: G. T. Clark Russell G. DeWitt James C.
24、Ewin Thomas F. Gillett A. Bruce Hoadly Karl A. Greenhagle, Chairman William Karas Alan W. King Jack Kinn E. Paul Lange Benjamin Leon Fred J. Ricci Howard Shimokura Ralph Showers R. Willoughby Brian J. Wilson The following persons were on the balloting committee that approved this document for submis
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