NBN EN 61703 : 2002

1 Scope
2 Normative references
3 Definitions
4 Glossary of symbols and abbreviations
  4.1 Non-repaired items
  4.2 Repaired items with zero time to restoration
  4.3 Repaired items with non-zero time to restoration
5 Assumptions
  5.1 General remarks
  5.2 Assumptions for non-repaired items
  5.3 Assumptions for repaired items
6 Mathematical expressions
  6.1 Non-repaired items
      6.1.1 Presentation
      6.1.2 Reliability [191-12-01]
      6.1.3 Instantaneous failure rate [191-12-02]
      6.1.4 Mean failure rate [191-12-03]
      6.1.5 Mean time to failure [191-12-07]
  6.2 Repaired items with zero time to restoration
      6.2.1 Presentation
      6.2.2 Reliability [191-12-01]
      6.2.3 Instantaneous failure intensity [191-12-04]
      6.2.4 Mean failure intensity [191-12-05]
      6.2.5 Mean time to failure [191-12-07]
      6.2.6 Mean time between failure [191-12-08]
      6.2.7 Mean operating time between failure [191-12-09]
      6.2.8 Mean up time [191-11-11]
  6.3 Repaired items with non-zero time to restoration
      6.3.1 Presentation
      6.3.2 Reliability [191-12-01]
      6.3.3 Instantaneous failure intensity [191-12-04]
      6.3.4 Mean failure intensity [191-12-05]
      6.3.5 Mean time to failure [191-12-07]
      6.3.6 Mean time between failures [191-12-08]
      6.3.7 Mean operating time between failures [191-12-09]
      6.3.8 Instantaneous availability [191-11-01]
      6.3.9 Instantaneous unavailability [191-11-02]
      6.3.10 Mean availability [191-11-03]
      6.3.11 Mean unavailability [191-11-04]
      6.3.12 Asymptotic availability [191-11-05]
      6.3.13 Asymptotic unavailability [191-11-07]
      6.3.14 Mean up time [191-11-11]
      6.3.15 Mean down time [191-11-12]
      6.3.16 Maintainability [191-13-01]
      6.3.17 Mean repair rate [191-13-03]
      6.3.18 Mean repair time [191-13-05]
      6.3.19 Mean active corrective maintenance time [191-13-07]
      6.3.20 Mean time to restoration [191-13-08]
      6.3.21 Mean administrative delay [191-13-11]
      6.3.22 Mean logistic delay [191-13-13]
Annex A (informative) - Performance aspects and descriptors
Annex B (informative) - Summary of measures related to time
                         to failure
Annex C (informative) - Comparison of some dependability
                         measures for continuously operating
                         items
Annex D (informative) - Software dependability aspects
Annex ZA (normative) - Normative references to international
                         publications with their corresponding
                         European publications
Bibliography
Figures
Tables

Provides mathematical expressions for reliability, availability, maintainability and maintenance support measures defined in IEC 60050-191.