Chapter 8. Connection Reliability

  1. William C. Hardy

Published Online: 18 APR 2002

DOI: 10.1002/0470845910.ch8

QoS: Measurement and Evaluation of Telecommunications Quality of Service

QoS: Measurement and Evaluation of Telecommunications Quality of Service

How to Cite

Hardy, W. C. (2001) Connection Reliability, in QoS: Measurement and Evaluation of Telecommunications Quality of Service, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/0470845910.ch8

Author Information

  1. WorldCom, USA

Publication History

  1. Published Online: 18 APR 2002
  2. Published Print: 1 JUN 2001

ISBN Information

Print ISBN: 9780471499572

Online ISBN: 9780470845912

SEARCH

Keywords:

  • answer/seizure ratio;
  • ASR;
  • blocking probability;
  • call completion rate;
  • connection failure;
  • grade-of-service;
  • handshake success rate;
  • high-and-dry;
  • monitoring;
  • NCR;
  • normal completion rate;
  • offered traffic;
  • reorder tone;
  • ring-back signal;
  • station busy signal;
  • use-to-potential ratio

Summary

Describes and analyzes users' concerns with their ability to effect connections through a telecommunications service. Defines the generic measure for perceived QoS to be the probability of experiencing and expected outcome, regardless of its cause. Contrasts the resultant measure, Normal Completion Rate (NCR) with more commonly used measures of connection success probability, such as the call completion rate and answer/seizure ratio. Recommends the probability distribution of runs of connection failures as the appropriate quantifier for purposes of evaluation, and describes evaluation criteria based on that quantifier. Supporting Appendix C analyzes the practical problems involved in trying to use answer/seizure ratio to compare connection reliabilities.