CCITT Rec. V.24 (11/1988) – LIST OF DEFINITIONS FOR INTERCHANGE CIRCUITS BETWEEN DATA TERMINAL EQUIPMENT (DTE) AND ...
1 Scope
2 Line of demarcation
3 Definitions of interchange circuits
3.1 100 series - General application
3.2 200-series - Specifically for parallel automatic calling
3.3 Circuit failures (electrical)
3.4 Optional circuits
4 Operational requirements
4.1 Data circuits
4.2 Idle periods
4.3 Clamping
4.4 Operation of circuits 107, 108/1 and 108/2
4.5 Interrelationship of circuits 103, 105 and 106
4.6 Timing circuits
4.7 Circuit 125 - Calling indicator
4.8 Usage of circuits 126 and 127
4.9 Circuit 140 - Loopback/Maintenance Test
4.10 Interrelationship of circuits 202 to 211
Reference