CONTENTS

Scope of the Recommendation
1 General characteristics
1.1 Definitions
1.2 Abbreviations
1.3 Application of the equipment
1.4 Size
1.5 Modularity
1.6 Timing signal
2 Functions
2.1 Mapping
2.2 Signal processing
2.3 Concentration function for switched services
2.4 Management
3 Functional representation of the equipment and definition of reference points
3.1 Functional representation
3.2 Definition of functional blocks
3.3 Definition of Reference Points
4 Tributary interfaces
4.1 Analogue interfaces
4.2 Digital interfaces
5 Aggregate interfaces
5.1 2048 kbit/s interface
5.2 8448 kbit/s interface
5.3 34 368 kbit/s interface
5.4 139 264 kbit/s interface
6 Synchronization interface at 2048 kHz
7 Local control interface
8 Power interfaces
9 Defect or failure conditions and consequent actions for the tributary interfaces
9.1 Defect or failure conditions
9.2 Consequent actions
10 Defect or failure conditions and consequent actions for the aggregate
10.1 Defect or failure conditions
10.2 Consequent actions for defect or failure conditions related to the A Reference Point
10.3 Consequent actions for defect or failure conditions related to the B2 Reference Point
10.4 Consequent actions for defect or failure conditions related to the E2/E2 Reference Point
11 Defect or failure conditions and consequent actions for the core of the equipment
11.1 Defect or failure conditions
11.2 Consequent actions at the O2 or A1 or E1/E1 or L2 or N2 Reference Points
12 Performance monitoring
13 Performance of the equipment
13.1 Jitter
13.2 Transfer delay
13.3 Slips
13.4 Service availability
13.5 Error performance
13.6 Bit sequence independence
14 Management
Appendix I Baseband line transmission system
I.1 General
I.2 Physical model of the line transmission system
I.3 Functional description of the DCE
I.4 Functions of TU functional block
I.5 Requirements for a line transmission system using 2B1Q line code
I.6 DCE Management channel
I.7 Management System Unit