�1���
�Scope�
�2��� �References�
�3��� �Definitions��
������ �3.1��� �Terms defined elsewhere����
������ �3.2��� �Terms defined in this Recommendation�������
�4��� �Abbreviations and acronyms��������
�5��� �Conventions�����
�6��� �Overview of service environments of transport networks���
������ �6.1��� �Evolution of transport
networks������
������ �6.2��� �Services environment
of transport networks
�7��� �Assessment indexes for the
operational status of transport networks����������
������ �7.1��� �Conventions for the
concept of circuit operational state of a transport network��������
������ �7.2��� �Service outage index (SOI)
������ �7.3��� �Service affected index��������
�8��� �Failure measuring approach of (O, A, P, R) quaternion�����
Appendix I � Usage examples for assessment indexes��� �
������ �I.1���
��� Examples for SOI and SAI applications����
������ �I.2��� ������Example of early warning for circuit lines using
SOI and SAI��� �