1 Introduction
1.1 Scope
1.2 Purpose
1.3 Application of this Recommendation
2 References
3 Abbreviations
4
Definitions
4.1 Availability
4.2 End-to-end paths
4.3 Path elements
4.4 Path element categories
4.5
Performance level categories
5 Length categories
6 Availability parameters
6.1 Availability ratio and
unavailability ratio
6.2 Mean time between outages and
outage intensity
7 Availability objectives
7.1 End-to-end availability
7.2 End-to-end
objectives
7.3 Availability objectives for path
elements
8 Related availability parameters
Annex A – Examples of
path topologies and end-to-end path availability calculations
A.1 Purpose
A.2 Path topologies
A.3 End-to-end unavailability
calculations
A.4 Large-scale telecommunication networks
Appendix I –
Bibliography
Appendix II –
Calculations and service levels supporting the end-to-end availability
objectives