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• 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