Digital to Analog Encoding

• transmitting data over telephone network

  designed to switch, receive & transmit signals in voice-frequency range : ~300-3400Hz ( bandwidth of 3100 Hz)
  

• Modems: MOdulator/DEModulator

  converts digital signal to analog signal and analog signal to digital
  
  for telephone lines converts signal to voice-range frequency, else higher frequencies

• future: ISDN will handle digital signals over a separate channel

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