�1���� Reference configurations
������� 1.1���� Customer access configuration
������� 1.2���� Network configuration
������� 1.3���� Interworking situation
�2����
Terminal adaption functions
������� 2.1���� Terminal adaption functions for DTEs conforming to X.1 user
classes of service 3 to 6
������� 2.2���� Terminal adaption functions for DTEs conforming to X.1 user
class of service 7
������� 2.3���� Terminal adaption functions for DTEs conforming to X.1 user
class of service 19
������� 2.4���� Terminal adaption functions for DTEs conforming to X.1 user
classes of service 1, 2, 14, 15, 16, 17 and 18
�3����
Test loops
������� 3.1���� Test loop reference configuration
������� 3.2���� Test loop characteristics
������� 3.3���� Loop activation/deactivation mechanism
������� 3.4���� Coding of activation/deactivation control message
Annex A � SDL diagrams
������� A.1���� General
������� A.2���� Some remarks about the formal description
Appendix I � Universal terminal adaptor
������� I.1���� User rate identification
������� I.3���� Loss of alignment/recovery
������� I.4���� Ready for data alignment
Appendix II � Inslot identification of intermediate bit rate
������ II.1���� Identification of intermediate rate
������ II.2���� Restitution of the intermediate rate
������ II.3���� User rate identification