hérna er síða sem ég fann . hún er með svipuðum lista og var gerður á töfluna uppi í skóla. 
slóðin að síðuni er 
http://www.adsl4me.com/speed.htmlhérna er svo önnur síða sem ég fann
http://homepage.interaccess.com/~jkristof/xdsl-faq.txtog á henni stendur þetta um ADSL.
ADSL
  Asymmetric Digital Subscriber Line (ADSL) is the most popular form
  of xDSL technology.  The key to ADSL is that the upstream and
  downstream bandwidth is asymmetric, or uneven.  In practice, the
  bandwidth from the provider to the user (downstream) will be the
  higher speed path.  This is in part due to the limitation of the
  telephone cabling system and the desire to accommodate the typical
  Internet usage pattern where the majority of data is being sent to
  the user (programs, graphics, sounds and video) with minimal upload
  capacity required (keystrokes and mouse clicks).  Downstream speeds
  typically range from 768 Kb/s to 9 Mb/s Upstream speeds typically
  range from 64Kb/s to 1.5Mb/s.