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Interfaces

• Pulse and multi-frequency telephone
• Local and long-distance public telephone
• Semipublic telephone
• Tele-fed ISDN basic access (2B + D)
• Primary access (30B+D).

• V.51. and V.5 interfaces

• Analogic line signaling
  
  
  • 2 wires direct current
  • 4 wires E&M direct current
  • 4 wires E&M pulse
    
    
• Digital line signaling
  
  
  • Direct E&M
  • Pulse E&M
  • Digital R2
    
    
• Register signaling
  
  
  • MFC–5C
  • MFC–5B
  • MF–5S
    
    
• SCC#7 signaling
  
  
  • MTP
  • TUP
  • ISUP