�1���� General
������� 1.1���� Scope
������� 1.2���� Definition
������� 1.3���� Objectives
������� 1.4���� Abbreviations
�2����
Functions
������� 2.1���� B-channel
������� 2.2���� D-channel
������� 2.3���� Bit timing
������� 2.4���� Octet timing
�������
2.5���� Frame alignment
������� 2.6���� Activation from LT or NT1
������� 2.7���� Deactivation
������� 2.8���� Power feeding
������� 2.9���� Operations and maintenance
�3����
Transmission medium
������� 3.1���� Description
������� 3.2���� Minimum ISDN requirements
������� 3.3���� DLL physical characteristics
������� 3.4���� DLL electrical characteristics
�4����
System performance
������� 4.1���� Performance requirements
������� 4.2���� Performance measurements
�5����
Transmission method
�6����
Activation/deactivation
������� 6.1���� General
������� 6.2���� Physical representation of signals
�7����
Operation and maintenance
������� 7.1���� Operation and maintenance functions
������� 7.2���� CL channel
������� 7.3���� Transfer mode of operation and maintenance links
�8����
Power feeding
������� 8.1���� General
������� 8.2���� Power feeding options
������� 8.3���� Power feeding and recovery methods
������� 8.4���� DLL resistance
������� 8.5���� Wetting current
������� 8.6���� LT aspects
������� 8.7���� Power requirements of NT1 and regenerator
������� 8.8���� Current transient limitation
�9����
Environmental conditions
������� 9.1���� Climatic conditions
������� 9.2���� Protection
������� 9.3���� Electromagnetic compatibility
Appendix I � Electrical characteristics of an MMS 43 transmission system
������� I.1���� Line code
������� I.2���� Symbol rate
������� I.3���� Frame structure
������� I.4���� Frame word
������� I.5���� Frame alignment procedure
������� I.6���� Multiframe
������� I.7���� Frame offset at NT1
������� I.8���� CL-channel
������� I.9���� Scrambling
������ I.10���� Activation/deactivation
������ I.11���� Jitter
������ I.12���� Transmitter output characteristics
������ I.13���� Transmitter/receiver termination
Annex A � Extension functions and requirements for a line system with MMS 43
line code