�1���� 64 kbit/s aggregate
������� 1.1���� General
������� 1.2���� Aggregate bearer channel
������� 1.3���� Frame structure
������� 1.4���� Type of multiplexing
������� 1.5���� Allocation of information bits
������� 1.6���� Telegraph and data channels
������� 1.7���� Frame alignment
������� 1.8���� Loss of telegraph input
������� 1.9���� Bearer interface
������ 1.10���� Telegraph interface
�2����
Aggregate bearer rates lower than 64 kbit/s
������� 2.1���� General
������� 2.2���� Aggregate bearer channels
������� 2.3���� Frame structure
������� 2.4���� Type of multiplexing
������� 2.5���� Allocation of information bits
������� 2.6���� Telegraph and data channels
������� 2.7���� Frame alignment
������� 2.8���� Loss of telegraph input
������� 2.9���� Bearer interface
������ 2.10���� Telegraph interface
�3����
Compatibility
Annex A � Transition coding process
References