Rec. ITU-T V.38 (03/1993) … A 48/56/64 kbit/s DATA CIRCUIT TERMINATING EQUIPMENT STANDARDIZED FOR USE ON DIGITAL ...
FOREWORD
CONTENTS
1 Introduction
2 Signalling rates
    2.1 Data signalling rates
    2.2 Signalling rates on line
3 Differentiation between user and network data signals
    3.1 Scrambler
    3.2 Descrambler
4 Interfaces
    4.1 V.24-type interface
    4.2 X.24-type interface
5 Rate adaptation
6 Testing facilities
    6.1 Test loops
    6.2 Self tests
7 Multiplexing
Appendix I … Functional block diagram
Appendix II … Connection schematic
Appendix III … Rate adaptation of data signalling rates below 48 kbit/s
III.1 Data signalling rates
III.2 Rate adaptation
III.3 Interfaces