Basic HTML version of Foils prepared Dec. 6 98

Foil 36 xDSL - Digital Subscriber Line Technology (1)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
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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