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.1.1 Definition of the minimal test for PSCT availability state
determination
A.1.2 Definition of the minimal test for CSCT availability state determination
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
A.5.1 SPRT test procedure
A.5.2 SPRT methodology
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.1.1 Definition of the example
end-to-end PSCT connections
B.1.2 End-to-end PSCT availability performance for the Case 1 and Case 2
configuration examples
B.1.3 Representative design availability performance of other ISDN 64 kbit/s
connection types
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