CONTENTS

 1     Scope
        1.1     Application of this Recommendation
        1.2     Transport network layers
                  1.2.1     PDH and SDH transport networks
                  1.2.2     ATM connections
        1.3     Allocation of end-to-end performance
 2     References
 3     Abbreviations
 4     Terms and Definitions
                  4.2.3     Cell-based digital paths
        4.3     Generic definition of the block
        4.4     Error performance events
        4.5     Error performance parameters
 5     The measurement of the block
        5.1     In-service monitoring of blocks
        5.2     Out-of-service measurements of blocks
 6     Performance assessment
        6.1     Implications for error performance measuring devices
        6.2     Performance monitoring at the near end and far end of a path
 7     Error performance objectives
        7.1     End-to-end objectives
        7.2     Apportionment of end-to-end objectives
                  7.2.1     Allocation to the national portion of the end-to-end path
                  7.2.2     Allocation to the international portion of the end-to-end path
Annex A – Criteria for entry and exit for the unavailable state
        A.1     Criteria for a single direction
        A.2     Criterion for a bidirectional path
        A.3     Criterion for a unidirectional path
        A.4     Consequences on error performance measurements
Annex B – Relationship between PDH path performance monitoring and the block-based parameters
        B.1     General
                  B.1.1     Block size for monitoring PDH paths
                  B.1.2     Anomalies
                  B.1.3     Defects
        B.2     Types of paths
        B.3     Estimation of the performance parameters
        B.4     In-service monitoring capabilities and criteria for declaration of the performance parameters
        B.5     Estimation of performance events at the far end of a path
        B.6     Differences between Recommendations G.826 and M.2100 concerning path performance
                  B.6.1     General
                  B.6.2     Allocation methodology
Annex C – Relationship between SDH path performance monitoring and the block-based parameters
        C.1     General
                  C.1.1     Converting BIP measurements into errored blocks
                  C.1.2     Block size for monitoring SDH paths
                  C.1.3     Anomalies
                  C.1.4     Defects
                  C.1.5     Measurement of performance events using aggregate parity error counts
        C.2     Estimation of the performance parameters
        C.3     Estimation of performance events at the far end of a path
Annex D – Relationship between cell-based network performance monitoring and the block-based parameters
        D.1     General
                  D.1.1     Block size for monitoring cell-based paths
                  D.1.2     Anomalies
                  D.1.3     Defects
        D.2     Types of paths
        D.3     Estimation of the performance parameters
        D.4     Estimation of performance events at the far end of the path
Appendix I – Flow chart illustrating the recognition of anomalies, defects, errored blocks, ES and SES
Appendix II – Bit errors and block errors, merits and limitations
Appendix III – Applicability of Recommendation G.826 to non-public networks