xDSL - Digital Subscriber Line Technology (1)

• xDSL - modem technology; allows mixing data, voice and video over conventional, copper phone lines.

• The service under development (since 1987).

• Competes with ISDN and cable modems

• xDSL family : ADSL, RADSL, IDSL, HDSL, SDSL, VDSL

• All xDSL technologies run on existing copper phone lines and use modulation to boost transmission rates.

  • CAP - amplitude phase modulation
  • DMT - discrete multi-tone modulation
  • DWMT- discrete wavelet multi-tone modulation.

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