�1����
Scope
�2����
References
�3����
Abbreviations
�4����
The definition and measurement of the block for SDH multiplex sections
������� 4.1���� Definition of the block for an SDH multiplex section
������� 4.2���� Block sizes
����������������� 4.2.1���� In-service monitoring of blocks
������� 4.3���� Out-of-service measurements of blocks
�5����
Error performance events for SDH multiplex sections
������� 5.1���� Definitions
������� 5.2���� Events determination for multiplex sections
������������ �����5.2.1���� Anomalies
����������������� 5.2.2���� Defects
����������������� 5.2.3���� Estimation of the performance events
�6����
The definition and measurement of the block for SDH regenerator sections
������� 6.1���� Definition of the block for an SDH regenerator section
������� 6.2���� Block sizes
������� 6.3���� In-service monitoring of blocks
������� 6.4���� Out-of-service measurements of blocks
�7����
Error performance events for SDH regenerator sections
������� 7.1���� Definitions
������� 7.2���� Events determination for regenerator sections
����������������� 7.2.1���� Anomalies
����������������� 7.2.2���� Defects
����������������� 7.2.3���� Estimation of the performance events
Annex A � Entry and
exit criteria for the unavailable state of�
a single direction of an SDH section
������� A.1���� Criteria for a single direction