xDSL Digital Subscriber Line Technology (3)

• 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)

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