CONTENTS

 1     General
        1.1     Convention
        1.2     Definition of the international portion
 2     Reference models
        2.1     Path Core Elements
        2.2     Hypothetical reference performance model for international 64 kbit/s paths
        2.3     Hypothetical reference performance model for international primary and higher order paths
 3     Performance objectives
        3.1     64 kbit/s rate
        3.2     Primary rate and higher bit rates
 4     Allocation principles
 5     Evaluation of error performance parameters
        5.1     Scope
        5.2     Evaluation of ES/SES parameters from in-service measurements
        5.3     Evaluation of ES/SES parameters from out-of-service measurements
 6     Performance limits
        6.1     General
        6.2     Performance limits for bringing-into-service
        6.3     Performance limits for maintenance
        6.4     Long-term quality monitoring/measurement
 7     Effects of timing impairments on error performance
 8     Availability at 64 kbit/s layer and higher bit rate
        8.1     Definitions of available and unavailable states
        8.2     Consequences for error maintenance measurements
        8.3     Inhibiting performance monitoring during unavailable time
        8.4     Unavailability limits
Annex A – Example applications of RPO allocation from Tables 2a and 2b
Annex B – In-service ES and SES parameter evaluation criteria
Annex C – Values for bringing-into-service limits for international digital paths
Annex D
References