Table of Contents

Foreword
1 Scope
2 References
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 General considerations
5 Voice telephony QoS indicators
  5.1 Fault reports per access line per year
  5.2 Unsuccessful call ratio
  5.3 Call set up time
  5.4 Supply time for initial network connection
  5.5 Percentage of orders completed on or before the date
      confirmed or contracted with the customer
  5.6 Response time for operator services
  5.7 Availability (i.e. in working order) of card and coin
      operated public pay phones
  5.8 Fault repair time
  5.9 Service restoration
6 ISDN QoS indicators
  6.1 For all bearer services
  6.2 For circuit mode switched bearer services
  6.3 For circuit mode permanent bearer services
  6.4 For all packet mode bearer services
  6.5 For packet mode switched bearer services
  6.6 For packet mode permanent services
Annex A: The five principles for ONP QoS Indicators
Annex B: Relationship between the accuracy of the estimator of
         the unsuccessful call ratio and the number of calls to
         be observed
History

Abstract

Enhanced version of ETR 138 to incorporate recent advances in the field of QoS study for ISDN and telephony.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	NA 4