• 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