1
Scope
2 References
3 Terms and definitions
4 Abbreviations
5 Reference models
5.1 Hypothetical reference performance
models for international 64 kbit/s connections
5.2 Hypothetical reference performance
model for international primary and higher order paths
6 Performance objectives
6.1 Connections operating below the
primary rate
6.2 Primary rate and higher bit rates
7 Allocation principles
8 Evaluation of error performance
events
8.1 Evaluation of ES/SES events from
in-service measurements
8.2 Evaluation of ES/SES events from
out-of-service measurements
8.3 Definition of ratios
9 Performance limits – General considerations
9.1 Relationship
between performance limits and objectives
9.2 Type of limits
10 Performance limits for bringing-into-service
10.1 Calculation of the BIS limits
10.2 BIS limits values
11 Performance limits for maintenance
11.1 Performance levels and limits
11.2 Performance thresholds
12 Long-term quality monitoring/measurement
13 Effects of timing impairments on error performance
14 Availability and unavailability
14.1 Definitions of available and
unavailable states
14.2 Consequences for error performance
measurements
14.3 Inhibiting performance monitoring
during unavailable time
14.4 Unavailability limits
Annex A – Example
applications of PO allocation from Tables 2a and 2b
Annex B – In-service
ES and SES event evaluation criteria
Annex C – Values for
bringing-into-service limits for international digital paths
Annex D – Default
unacceptable performance level thresholds for international digital paths