Rec. ITU-T V.110 (09/1992) – SUPPORT OF DATA TERMINAL EQUIPMENTS WITH V-SERIES TYPE INTERFACES BY AN INTEGRATED SERVICES ...
FOREWORD
1 Reference configurations
    1.1 Terminal adaptor reference model
    1.2 Connection types
2 Line signals at S and T reference points
    2.1 Bit rate adaptation of synchronous data signalling rates up to 19.2 kbit/s
    2.2 Rate adaptation of 48 and 56 kbit/s user rates to 64 kbit/s
    2.3 Adaptation for asynchronous rates of up to 19 200 bit/s
    2.4 Flow control
3 Interchange circuits
    3.1 Essential and optional interchange circuits
    3.2 Timing arrangement
    3.3 Circuit 106
    3.4 Circuit 109
    3.5 Electrical/mechanical characteristics of interchange circuits
    3.6 Fault condition on interchange circuits
4 Operating sequence
    4.1 TA duplex operation
    4.2 TA half-duplex operation
    4.3 Automatic calling
5 Network independent clocks
    5.1 Measurement of phase differences
    5.2 Positive/negative compensation
    5.3 Encoding
6 Inband parameter exchange state
7 Testing facilities
ANNEX A – Reference configurations
A.1 Introduction
A.2 V.110 terminal adaptor reference model
A.3 Terminal adaption type
A.4 Types of end-to-end connection
ANNEX B – Alphabetical list of abbreviations used in this Recommendation
APPENDIX I – In-band parameter exchange
I.1 Introduction
I.2 Definitions
I.3 Overview
I.4 Reference configuration
I.5 Procedures
I.6 Coding
I.7 Timer values
I.8 State transition diagrams
APPENDIX II – V.25 bis to Q.931 protocol mapping
II.1 General
II.2 Call origination
II.3 Call clearing (Figure II-2/V.110 and Figure II-3/V.110)
II.4 Direct call
II.5 Mapping of Q.931 causes to V.25 bis call failure indications and responses
II.6 Additional information for handling of exception situations