• ITU-T Rec. X.137 (1988)
  • 1 Introduction
  • 2 Availability function
  • 3 Availability parameters
    • 3.1 Service availability definition
    • 3.2 Definition of mean time between service outages
    • 3.3 Values
    • 3.4 Related parameters
  • ANNEX A – Sampling estimation of availability parameters
  • A.1 A minimal test for availability
  • A.2 Procedures for estimating service availability
  • A.3 Procedures for estimating mean time between service outages
  • ANNEX B – Representative end-to-end availability performance
  • B.1 Definition of the example end-to-end connections
  • B.2 End-to-end availability performance for the Type 1 and Type 2 configuration examples