�1���� Introduction
������� 1.1���� Scope and field of application
�2����
Type of configuration
������� 2.1���� Point-to-point
������� 2.2���� Location of interfaces
�3����
Functional characteristics
������� 3.1���� Summary of functions (layer 1)
������� 3.2���� Interchange circuits
������� 3.3���� Activation/deactivation
������� 3.4���� Operational functions
�4����
Interface at 1544 kbit/s
������� 4.1���� Electrical characteristics
������� 4.2���� Frame structure
������� 4.3���� Timing considerations
������� 4.4���� Time slot assignment
������� 4.5���� Jitter, wander and phase transients
������� 4.6���� Interface procedures
������� 4.7���� Maintenance
�5����
Interface at 2048 kbit/s
������� 5.1���� Electrical characteristics
������� 5.2���� Frame structure
������� 5.3���� Timing considerations
������� 5.4���� Jitter
������� 5.5���� Tolerable longitudinal voltage
������� 5.6���� Output signal balance
������� 5.7���� Impedance towards ground
������� 5.8���� Interface procedures
������� 5.9���� Maintenance at the interface
�6����
Connector
�7����
Interface wiring
�8����
Power feeding
������� 8.1���� Provision of power
������� 8.2���� Power Consumption
������� 8.3���� Voltage range
������� 8.4���� Protection
Annex A � Time slot assignment for interfaces having only H0-channels
������� A.1���� 1544 kbit/s interface
������� A.2���� 2048 kbit/s interface
Annex B � Time slot assignment for 2048 kbit/s interfaces having an H11-channel
Appendix I � Pulse mask for interface at 1544 kbit/s