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r6 - 17 Dec 2005 - 06:28:56 - RobRiitanoYou are here: TWiki >  OLT Web  > DSLServicesVariations

DSL Services Variations

Digital Subscriber Lines vary in technologies and speeds. Currently there are nine variations of DSL lines which are described below:

  • ADSL - Asymetric Digital Subscriber Line
  • ADSL 2 - Asymetric Digital Subscriber Line 2
  • RADSL - Rate-adaptive Digital Subscriber Line
  • CDSL - Consumer Digital Subscriber Line
  • HDSL - High-bit-rate Digital Subscriber Line
  • IDSL - ISDN-like Digital Subscriber Line
  • SDSL - Symmetric Digital Subscriber Line
  • VDSL - Very High Speed Digital Subscriber Line
  • VDSL 2 - Very High Bit Rate DSL 2

Service Download Upload Mode of operation
ADSL 1.5 – 8.192 Mbps 16 Kbps – 1 Mbps Different up and down speeds, one pair of copper wires. This is the weakest and slowest form of DSL.
ADSL 2 1.5 – 25 Mbps 16 Kbps – 1 Mbps Different up and down speeds, one pair of copper wires.
RADSL 64 Kbps – 8.192 Mbps 16 – 768 Kbps Different up and down speeds. Many common operations on 768 Kbps, one pair of copper wires.
CDSL 1 Mbps 16 – 128 Kbps Now ratified as DSL-lite. No splitters, one pair of copper wires.
HDSL (in North America) 1.544 Mbps 1.544 Mbps Symmetrical services. Two pairs copper of wires.
HDSL (in rest of world) 2.048 Mbps 2.048 Mbps Symmetrical services. Two pairs of copper wires.
IDSL 144 Kbps 144 Kbps Symmetrical operation. One pair of copper wires.
SDSL (in North America) 1.544 Mbps 1.544 Mbps Uses only one pair of copper wires.
SDSL (in rest of world) 2.048 Mbps 2.048 Mbps Uses only one pair of copper wires.
VDSL 13 – 100 Mbps 1.5 – 50 Mbps Uses Fiber optic cable. It offers very high speed DSL connections. At present, this method is only being used for limited commercial use. DSL providers hope to make this form of DSL more common in the future.
VDSL 2 100 Mbps 100 Mbps Uses Fiber optic cable. VDSL 2, which uses 30 MHz of spectrum of the bandwidth, is currently the most advanced version of all DSL connections. Not yet offered in most areas of the USA. VDSL 2 offers a symmetrical upstream/downstream rate of 100 Mbps, with a range from central office of 12,000 feet.

-- RobRiitano - 15 Dec 2005

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