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