CONTENTS

1 General
1.1 Scope
1.2 Configuration
1.3 Application
1.4 Abbreviations
2 Modelling and relationship between the digital section and the ET
3 Functions
3.1 B-channel
3.2 H0-channel
3.3 H11-channel
3.4 D-channel
3.5 Bit timing
3.6 Octet timing
3.7 Frame alignment
3.8 CRC procedure
3.9 Power feeding
3.10 Operations and maintenance
4 Network performance
4.1 Availability
4.2 Signal transfer delay
4.3 Error performance
4.4 Jitter
5 Operations and maintenance
5.1 General
5.2 Control facilities
5.3 Monitoring
6 Operation and maintenance procedures
6.1 General
6.2 4 kbit/s data link
6.3 Partitioning of functions
6.4 Definitions of signals at the T reference point
6.5 Definition of FEs at the V3 reference point
6.6 PH and MPH primitives
6.7 Digital section (DS) state machine
6.8 Definition of ET layer 1 state machine
Annex A System management requirements
A.1 Introduction
A.2 System management requirements
Appendix I Transmission algorithm of performance report messages at NT1 based on option 2