CONTENTS

 Introduction       
Background        
 1     Scope
 2     References
 3     Abbreviations
 4     Definitions
        4.1     Digital connections
        4.2     Error performance events and parameters
                  4.2.1     Events
                  4.2.2     Parameters
        4.3     Functions of error performance objectives
 5     Performance objectives
 6     Apportionment of overall objectives
        6.1     Basic apportionment principles
        6.2     Apportionment strategy for the errored seconds requirement
        6.3     Apportionment strategy for the severely errored seconds requirement
Annex A – Available and unavailable time
Annex B – Guidelines concerning the interpretation of Table 1
Appendix I – Inconsistencies between Recommendations G.821 and G.826
        I.1     Introduction
        I.2     Comparison of the SES definitions and objectives
        I.3     Comparison of Errored Second Ratio objectives
        I.4     Summary