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International Conference on Dependable Systems and networks (DSN)

作者： C.J. Lin A. Avritzer E.J. Weyuker Sai-Lai Lo AT&T Network Computing Services Middletown NJ USA AT and T Research Laboratories Florham Park NJ USA AT and T Research Laboratories Cambridge UK

the rapid changes in the telecommunications environment demand that new services are developed and deployed quickly, and that legacy systems are integrated seamlessly. While emerging technologies and standards such as CORBA allow rapid solution integration via shared reusable components, new issues arise for interoperability and performance assurance in highly heterogeneous environments. In this paper, we first identify these issues in a multi-vendor and multi-ORB telecommunications environment. We then propose a systematic approach for interoperability verification using a reference ORB and industry-standard test suites. We extend our interoperability testing framework to performance verification, where the scope of the tests is detailed and the design strategy is analyzed.

关键词： Intelligent networks Costs Companies Electrical capacitance tomography Computer networks telecommunication computing System testing Open systems Software standards Programming

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Evolution of optical transport in the at&t network

Evolution of optical transport in the AT&T network

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Proceedings of the 1998 Optical Fiber Communication Conference, OFC'98

作者： Clark, Laurel AT&T Network and Computing Services Holmdel United States

Achievement of a more physically diversified multiple vendor environment is desirable. Despite the ubiquity of SONEt equipment, the absence of a true mid-span meet in long-haul SONEt optical transmission systems makes this a challenging achievement that leads to an examination of the network transport architecture for other opportunities to facilitate other multiple vendor transport infrastructure environment. One such opportunity can be created by the separation of the optical and SONEt layers through the use of optoelectronic converters and the utilization of low-cost standardized optical interfaces. the resulting `stand-alone' WDM optical transmission systems can be directly connected to SONEt equipment or other optical transmission equipment.

关键词： Optical communication

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Investigating metrics for architectural assessment

Investigating metrics for architectural assessment

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Proceedings of the 1998 5th International Software Metrics Symposium

作者： Avritzer, Alberto Weyuker, Elaine J. AT&T Network Computing Services Red Hill United States

An empirical study is described using data collected during 50 architecture audits of large industrial telecommunications systems performed over a period of two years. the goal of this study was to develop metrics that could be used to differentiate between projects that are at high risk of failure and those at low risk. these metrics would be computed following an architecture audit before coding has begun, allowing measures to be taken to correct identified problems very early in the development lifecycle. Detailed information is presented about the use of the proposed risk prediction metric for seven of the systems for which we provided architecture audits.

关键词： Computer architecture

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Monitoring smoothly degrading systems for increased dependability

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Empirical Software Engineering 1997年第1期2卷 59-77页

作者： Avritzer, Alberto Weyuker, Elaine J. AT&T Network Computing Services Div Red Hill United States

A strategy is presented for determining when it is advantageous to take some action to restore a system to full capacity. A determination is made of the types of data that need to be collected and circumstances under which the strategy is likely to be useful. Production traffic data is presented for a very large industrial telecommunications project, and the strategy is applied. An investigation is made of when the application of the strategy leads to increased system availability and decreased packet loss experienced by users.

关键词： Software engineering

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Enforcing quality of service of distributed objects

Enforcing quality of service of distributed objects

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Proceedings of the 1997 8th International Symposium on Software Reliability Engineering, ISSRE

作者： Avritzer, Alberto Weyuker, Elaine J. AT&T Network Computing Services Red Hill United States

three algorithms designed to enforce different quality of service criteria are presented, as well as empirical assessments of the algorithms for three large industrial telecommunications systems. these assessments are made in terms of the simulated performance of each system on average loads selected from operational distributions collected during beta release and field use. In addition, synthetic heavy loads designed to cause the overall CPU utilization rates to exceed 90% of capacity were run. the algorithms build on previously defined load testing algorithms, and use parameters and operational distributions computed for that purpose. this makes the quality of service enforcement algorithms particularly efficient. the primary bases for the assessment of the algorithms were the overall deviation of the response time from the average, and the fraction of service requests that were throttled from clients under varying conditions.

关键词： Distributed computer systems

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Assessing software reliability performance under highly critical but infrequent event occurrences

Assessing software reliability performance under highly crit...

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International Symposium on Software Reliability Engineering (ISSRE)

作者： M.S. Alam W.H. Chen W.K. Ehrlich M.E. Engel D.A. Kropfl P. Verma Operations Technology Center AT&T Network Computing Services Middletown NJ USA

Operational testing is expensive and time-consuming in applications with highly critical but infrequent event occurrences, and procedures are needed for obtaining valid software reliability estimates. two such procedures are accelerated stress testing and experimental design techniques. Examples of accelerated stress in software include: a higher request arrival rate, increasing data traffic "burstiness", and so on. Furthermore, when the software is tested by executing the system under emergency conditions or exception events, it is critical that experimental design techniques are used to account for "carry-over" effects in failure performance. An application of software reliability testing of a telecommunication system node controller is used to describe the issues and our overall approach to software reliability assessment. the reliability projections based on our approach are compared to reliability estimates derived analytically and through simulation. Our results suggest that these statistical techniques are useful techniques for measuring reliability performance under critical events that have a low probability of occurrence.

关键词： Software reliability Software testing Application software Stress Design for experiments System testing Life estimation Acceleration Communication system traffic control Software performance

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Enforcing quality of service of distributed objects

Enforcing quality of service of distributed objects

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International Symposium on Software Reliability Engineering (ISSRE)

作者： A. Avritzer E.J. Weyuker AT&T Network Computing Services Redhill NJ USA AT and T Research Laboratories Florham Park NJ USA

关键词： Quality of service System testing Delay Software testing State-space methods Algorithm design and analysis Communication industry Computer industry Software systems Performance evaluation

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Modeling dynamic collections of interdependent objects using path-based rules 97

Modeling dynamic collections of interdependent objects using...

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Proceedings of the 12th ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications

作者： Diane Litman Peter F. Patel-Schneider Anil Mishra AT&T Labs-Research 180 Park Avenue Florham Park NJ AT&T Network and Computing Services 480 Red Hill Road Middletown NJ

ISBN: (纸本)9780897919081

Standard object-oriented languages do not provide language support for modeling changing collections of interdependent objects. We propose that R++, an integration of the rule and object-oriented paradigms, provides a mechanism for easily implementing such models. R++ extends C++ by adding a new programming construct called the path-based rule. Such data-driven rules are restricted to follow pointers between objects, and are like "automatic methods" that are triggered by changes to monitored objects. Path-based rules encourage a more abstract level of programming, and unlike previous rule integrations, are not at odds with the object-oriented paradigm and offer performance advantages for natural applications.

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An automatic power restoration process for electronic switching and transport systems

An automatic power restoration process for electronic switch...

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International Conference on telecommunications Energy (INtELEC)

作者： A.F. Kirk J.Q.W. Hagen S.V. Natale Lucent Technologies Inc. Naperville IL USA AT&T Network Computing Services Bedminster NJ USA

this paper describes a process to automatically restore DC power to transport and electronic switching system (ESS) equipment without manual intervention, after an extended battery discharge below the minimum operating voltage of the equipment. Manual intervention, in terms of this process, includes initialization of software and recharging of system capacitance. High level design criteria for restoration of the telecom system to the call processing or fully operational state are discussed.

关键词： Power system restoration telecommunications Voltage Power supplies Circuits Electronic switching systems Capacitance Rectifiers Battery management systems Energy management

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Acoustic variability in spontaneous conversational speech of American English talkers

Acoustic variability in spontaneous conversational speech of...

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Proceedings of the 1996 International Conference on Spoken Language Processing, ICSLP. Part 1 (of 4)

作者： Syrdal, Ann K. AT&T Network and Computing Services Holmdel United States

Speaker variability strongly impacts human perception and technology performance, yet large-scale, systematic study of the acoustic characteristics involved is rarely undertaken. this study provides statistics on selected segmental and suprasegmental acoustic parameters from measures made on spontaneous conversational telephone speech from 160 speakers in the Switchboard Corpus. Since spontaneous conversational speech is more dynamically variable than read speech and is representative of actual human communication, it was preferred for our applied research purposes.

关键词： Speech communication

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