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• ITU-T Rec. Q.552 (1988)
• 1 General
• 2 Characteristics of interfaces
  • 2.1 Characteristics of interface C2
  • 2.2 Characteristics of interface Z
• 3 Characteristics of half-connections
  • 3.1 Characteristics common to all 2-wire analogue interfaces
  • 3.2 Characteristics of interface C2
  • 3.3 Characteristics of interface Z
• ANNEX A – Example of a longitudinal interference coupling network