Basic HTML version of Foils prepared 5 February 98

Foil 96 xDSL Digital Subscriber Line Technology

From Introduction to Networking Technologies CPS640 MultiMedia and Networking -- Spring Semester 1998. by Roman Markowski
ADSL - Asymmetric Digital Subscriber Line
  • expected in general use in 1999
  • twisted pair copper
  • asymmetric: most commonly: 6Mbps (down), 640 Kbps (up)
    • downlink: 1.5 Mbps-8 Mbps
    • uplink : 176 Kbps - 1 Mbps
  • limited distance (18000 feet over 26-gauge copper)
RADSL - Rate-Adaptive Digital Subscriber Line
  • varying speeds depending upon line quality; asymmetric
    • downlink: 1.5 Mbps-8 Mbps
    • uplink : 176 Kbps - 1 Mbps
  • limited distance (18000 feet over 26-gauge copper)
HDSL - High-speed Digital Subscriber Line
  • full-duplex, symmetric
    • 1.544 Mbps or 2.048 Mbps in each direction
  • two twisted pairs (for T1) and 3 pairs (for E1)
  • max distance 12,000 feet

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