1 Introduction
1.1 Purpose
1.2 Scope
1.3 Abbreviations
1.4 Related Recommendations
1.5 Methodology of availability specification
1.6 Organization of this Recommendation
2
ISDN 64 kbit/s packet-switched connection type (PSCT) availability
performance
2.1 PSCT availability function
2.2 PSCT availability parameters
2.3 PSCT availability objectives
3
ISDN 64 kbit/s circuit-switched connection type (CSCT) availability
performance
3.1 CSCT availability function
3.2 CSCT availability parameters
3.3 CSCT availability objectives
4
ISDN 64 kbit/s dedicated-circuit connection type (DCCT) availability
performance
4.1 DCCT availability function
4.2 DCCT availability parameters
4.3 DCCT availability objectives
Annex A – Sampling estimation of ISDN availability parameters
A.1 Estimation of the availability state of switched ISDN
64 kbit/s connection type portions
A.2 Procedure for estimating availability of switched ISDN 64
kbit/s connection type portions
A.3 Procedure for estimating mean time between connection portion
outages of switched ISDN 64 kbit/s connection types
A.4 Statistical basis of Phase I minimal test with N = 4
A.5 Application of the sequential probability ratio test (SPRT) to
the Phase I minimal test for availability
Annex B – Representative end-to-end availability performance of ISDN
64 kbit/s connection types
B.1 Representative end-to-end design availability performance of
ISDN 64 kbit/s packet‑switched connection type (PSCT)
B.2 Derivation of the end-to-end “95th percentile” availability
from “worst-case” availabilities of connection portions
Annex C – Related availability parameters
Annex D – Factors to be specified in reporting ISDN availability performance of
64 kbit/s connection types
D.1 Planned hours of connection portion availability