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IEEE Journal on Selected Areas in Communications

Issue 8 • Date Oct 1988

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Displaying Results 1 - 24 of 24
  • Effect of DOA spares on predicted system reliability [switching system]

    Publication Year: 1988, Page(s):1440 - 1443
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The authors examine the effect of the initially defective probability, or as it is also known, the dead-on-arrival (DOA) probability, of spare circuit packs on the predicted reliability of a duplex system. A reliability model to incorporate the DOA probability and the associated spare-pack replacement time is developed. Calculations are made in an attempt to quantify the effect of these two variab... View full abstract»

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  • Field tracking studies: theory and practice [electronic equipment population]

    Publication Year: 1988, Page(s):1338 - 1349
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    Field tracking is a controlled study of a population of electronic equipment under field operating conditions. A field tracking study (FTS) is primarily used to evaluate product reliability performance in order to verify product conformance to reliability objectives and requirements. The planning, implementation, and analysis of FTSs are described with reference to practical experience with tracki... View full abstract»

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  • SCOOP-switching centers operating observations processing

    Publication Year: 1988, Page(s):1371 - 1377
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    SCOOP has been developed to postprocess data collected on telephone exchanges. The authors examine the load and traffic observation results related to local or combined local-toll central offices. They explain how the measurements for several exchanges forming a local network can be integrated to generate a point-to-point traffic matrix. The software package is briefly described View full abstract»

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  • An approach to developing an infant mortality requirement for fiber optic transport systems

    Publication Year: 1988, Page(s):1444 - 1447
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The approach used in developing an infant mortality requirement for fiber optic transport systems used in Bellcore client networks is described. Two generic parameters are considered: failure rate ratio, which is the ratio of the instantaneous failure rate to the steady-state failure rate, and infant mortality factor, which is the ratio of the expected number of failures in the first year of servi... View full abstract»

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  • Providing buyer feedback on digital switch field performance

    Publication Year: 1988, Page(s):1326 - 1329
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Argues that buyers of digital switching equipment can and should play a more active role in providing feedback on deployed equipment's field performance. Such feedback is even more important for making continuous reliability gains in the divested environment and as new technologies and functionality are rapidly deployed. To understand what role a buyer might play, the authors review various factor... View full abstract»

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  • Quality of telecommunication systems after sales: evaluation of field data

    Publication Year: 1988, Page(s):1305 - 1308
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The hardware reliability of telecommunications systems is subject to extremely stringent demands. A computer-based quality information system used to record field experience with digital switching systems in use throughout the world is described. The evaluation and use of the field data are discussed, and methods of failure rate prediction are examined. These approaches are compared to predictions... View full abstract»

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  • Reliability growth from the customer perspective [telecommunications]

    Publication Year: 1988, Page(s):1287 - 1293
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Reliability growth is considered from the customer/user perspective. It is emphasized that the reliability that the first customer observed with the first customer shipping can be quite different from the reliability that a customer will observe with a unit or system produced five years later. A basis for controlling reliability growth and the elapsed time of growth for the various product life cy... View full abstract»

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  • An automated field repair tracking system [telecommunication products]

    Publication Year: 1988, Page(s):1350 - 1358
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    The purpose of repair tracking (RT) is to provide ongoing feedback of product reliability performance in the customer environment. The authors present an RT technique and provide an overview of its automated software implementation, which has been used to track several transmission system products. The RT implementation, referred to as the repair equipment analysis program (REAP), tracks the field... View full abstract»

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  • Design and operational issues of VSAT application in ISDN-type networks

    Publication Year: 1988, Page(s):1422 - 1430
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    Advances in satellite technology in the area of very small aperture terminals (VSATs) offer economical data and voice services for corporate networks and rural applications. The authors describe VSAT application and technology with emphasis on analyzing the issues of quality after the sale. The quality and maintenance requirements of the VSAT networks in operation are defined. The reliability, mai... View full abstract»

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  • Software maintenance during system testing: enhanced methods for the System X project

    Publication Year: 1988, Page(s):1385 - 1392
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    The author describes improvements introduced during 1986 to the development process for the System X project, a large-scale stored-program-control telephone exchange system. Attention is given to improvements within the system testing phase of the life cycle, in particular, the methods whereby subsystem developers provide solutions to software problems identified by the system testing engineers. S... View full abstract»

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  • Quality after the scale: a marketing tool [telecommunication products]

    Publication Year: 1988, Page(s):1294 - 1298
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Reviews how vendors of electronic telecommunications products can modify the quality factors associated with service after the sale to increase or decrease perceived values. The author makes the following points: reliability is the key measurement of quality for high-technology products; customers are willing to pay more for reliable (i.e. better quality) products; resolving design and manufacturi... View full abstract»

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  • Implementation of firmware on SPC switching systems

    Publication Year: 1988, Page(s):1401 - 1404
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The recent trend toward distributed processing in stored-program-controlled (SPC) switching systems has resulted in increased use of firmware. The impact of firmware on SPC switching system reliability and maintainability, after sale of the product to user companies, can be substantial. The author examines both life cycle practices for firmware and the impact of firmware on switching systems, and ... View full abstract»

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  • Supplier quality improvement-the key to long-term quality relationships

    Publication Year: 1988, Page(s):1322 - 1325
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A vital and large part of maintaining high national telecommunications standards is the success of telecommunications suppliers in providing quality products and services for the nation's telecommunications network. A supplier quality improvement program has been developed to address this objective. The program stresses long-term relationships between the telephone companies and their suppliers wi... View full abstract»

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  • Performance monitoring and surveillance in integrated services networks

    Publication Year: 1988, Page(s):1378 - 1383
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The author addresses state-of-the-art monitoring, surveillance, and operational techniques for maintaining digital transmission performance at required levels. Specific areas reviewed are the architectural framework in which operations and maintenance functions are carried out and the transport network elements to be maintained, including physical links and logical paths. Also presented are perfor... View full abstract»

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  • The quality improvement process in telecommunications

    Publication Year: 1988, Page(s):1312 - 1321
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    Describes the quality improvement process recommended by Bellcore, and discusses the methodology developed for its implementation. The process is based on five principles: quality is conformance to valid requirements; the provider is responsible for quality and must demonstrate conformance; the way to achieve quality is prevention rather than inspection; the performance standard is defect-free wor... View full abstract»

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  • Field dependability evaluation principles

    Publication Year: 1988, Page(s):1330 - 1337
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The overall objective for the dependability assurance of Ericsson's main product, the AXE switching system, is delivery of a product with agreed reliability and maintainability performances, and the provisioning of maintenance support with agreed characteristics. The fulfillment of these objectives is evaluated through monitoring of a set of characteristic measures for quality and dependability du... View full abstract»

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  • FREDA: a methodology and a tool for monitoring quality and reliability of equipment and systems in the field [telecommunications]

    Publication Year: 1988, Page(s):1359 - 1363
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors describe the application of the FREDA (field reporting data) system, which was developed to manage quality data from the field. FREDA provides a methodology for data analysis and a tool for feedback activities that lead to final quality improvement. The application of FREDA to the LINEA-UT digital switching system is presented View full abstract»

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  • Telecommunications reliability databank: from components to systems

    Publication Year: 1988, Page(s):1364 - 1370
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The authors describe the main characteristics of the reliability databank implemented by Italtel and applied to telecommunications products. The databank requirements and features are presented, as well as the structure and input and output information. Emphasis is placed on describing the techniques adopted to correlate the component field failure data with the prediction data in order to update ... View full abstract»

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  • On computer communication network reliability under program execution constraints

    Publication Year: 1988, Page(s):1393 - 1400
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The authors propose a technique to compute software system reliability (SSR). The method, called FARE (fast algorithm for reliability evaluation), does not require a priori knowledge of multiterminal connections (MCs) for computing the reliability expression. An effort is made to sole the problem of N-version programming by using the FARE approach. Owing to its short execution time and lo... View full abstract»

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  • In-service quality improvement activities [telecommunication products]

    Publication Year: 1988, Page(s):1299 - 1304
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Reports on the quality improvement activities of a Japanese telecommunication manufacturer, focusing on feedback from the field. The authors discuss actions taken when a problem occurs for the particular case of a maintenance system for communication products; the inservice quality improvement committee; and preventive actions. The importance of preventing the design error from occurring again is ... View full abstract»

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  • Fault tolerance techniques in the NEAX61 digital switching system and its field performance

    Publication Year: 1988, Page(s):1414 - 1421
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The fault-tolerance techniques applied to the NEAX61 digital switching system are described, focusing on its operation modes, fault detection systems, abnormality supervision, and system restart functions. Also discussed is the improved field performance of NEAX61 systems over three years in terms of service interruptions, which were reduced as a result of quality improvement activities. Methods t... View full abstract»

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  • The effect of infant mortality of spares on switching system maintenance and downtime

    Publication Year: 1988, Page(s):1431 - 1439
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    An exact long-term solution and a numerical approximation are presented for the impact of infant mortality of spares on switching system maintenance and downtime. The numerical approximation is used to calculate the initial transient characteristics of the number of replacements, because theoretical results are difficult to get. Results show that the impact of the higher mortality replacement rate... View full abstract»

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  • Reliability and evolvability: requirements for the design of ISDN communication software

    Publication Year: 1988, Page(s):1405 - 1413
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    The ISDN (integrated services digital network) is characterized by the breadth of services to be supplied and the complexity of the protocols involved. Moreover, the ISDN services evolvability is an essential requirement which must be taken into account by telecommunication systems schedule. An approach to improving the quality of telecommunication products is described that is based on a formaliz... View full abstract»

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  • Quality and reliability in communications

    Publication Year: 1988, Page(s):1284 - 1286
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The critical dependence of communication on the computer and related peripheral equipment is discussed. The places where quality and reliability come into play in improving communication performance are identified. Promising areas in communication research are indicated View full abstract»

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Aims & Scope

IEEE Journal on Selected Areas in Communications focuses on all telecommunications, including telephone, telegraphy, facsimile, and point-to-point television, by electromagnetic propagation.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Muriel Médard
MIT