VoIP is the next big advance in telecommunications, but it is exceptionally hard to implement. The very things that make our telephones so comfortable to use--instant connections, strong clear signals, and no downtime--are the things data networks sacrificed for speed and flexibility. As we begin to replace traditional phone service with voice over data networks, quality assurance has to be re-invented. Telecom managers didn't design VoIP, but they're the ones responsible for quality and they have to come up to speed fast on the measurements, tools, and utilities in the IP environment that can help to get the job done.
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McGraw-Hill Education - Europe
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Höhe: 231 mm
Breite: 185 mm
Dicke: 32 mm
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ISBN-13
978-0-07-141076-2 (9780071410762)
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Schweitzer Klassifikation
William C. Chris Hardy, Ph.D., was for more than 10 years Executive Staff Analyst for Measures and Analyses at MCI, responsible for evaluating user perception of the quality of telephone services. He has 35 years experience in communications analysis, holds 10 patents for communications test and analysis technology, and is an internationally recognized expert in measurement and analysis of communications service quality. He lives in Dallas, Texas.
Part 1: FOUNDATIONS Chapter 1: Basics Chapter 2: Principal System-Level Determinants of Connection Quality Chapter 3: Quality Expectations and Requirements Chapter 4: Impairments Created or Exacerbated by Packet Switching Part 2: MEASUREMENT AND EVALUATION OF VOICE QUALITY Chapter 5: Voice Quality Chapter 6: Service Attribute Tests Chapter 7: Measurement of Speech Distortion Chapter 8: Multiple-Effects Models Chapter 9: Applications Part 3: OTHER ASPECTS OF QUALITY OF SERVICE Chapter 10: Other Quality of Service Concerns Chapter 11: Quality of Voice for Interactive Multimedia Exchange Afterword Appendix A: Types of Codecs Appendix B: How a Jitter Buffer Works Appendix C: Extensions of the Loss/Noise Grade ofService Model Appendix D: U.S. Patents for Voice QualityMeasurement and Analysis Technology References Index
