Chapter 6. Accessibility
Published Online: 18 APR 2002
DOI: 10.1002/0470845910.ch6
Copyright © 2001 John Wiley & Sons, Ltd
Book Title
QoS: Measurement and Evaluation of Telecommunications Quality of Service
Additional Information
How to Cite
Hardy, W. C. (2002) Accessibility, in QoS: Measurement and Evaluation of Telecommunications Quality of Service, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/0470845910.ch6
Publication History
- Published Online: 18 APR 2002
- Published Print: 1 JUN 2001
ISBN Information
Print ISBN: 9780471499572
Online ISBN: 9780470845912
- Summary
- Chapter
Keywords:
- accessibility;
- availability;
- encoding overhead;
- effective capacity;
- handling overhead;
- MTBO;
- mean time between outages;
- MTBOSI;
- outage;
- outage latency;
- service interruption;
- throughput efficiency
Summary
Describes the origin and nature of user concerns with ability to use a telecommunications service when needed. Defines a generic measure, accessibility, that reflects users' exposure to inability to use a telecommunications service, rather than service failures. Recommends Operating Characteristic Curves (OCCs) for Mean Time between Service Interruptions (MTBOSI) as the most meaningful quantifier for accessibility of intermittently used services and Operational Effective Capacity (OEC) for continuously used services. Displays the mathematical relationships between OCCs for MTBOSI and Mean Time between Outages. Shows how to calculate the OEC as a function of its various components, such as connection availability, throughput efficiency, and various overheads. Associated Appendix B explains why availability is a singularly inappropriate measure for addressing this concern.