What is the difference between ADSL and SDSL ?

ADSL is common type of DSL line that offers download speeds many times higher than upload speeds. This is the most common type of DSL used in residential applications.

SDSL is usually more expensive type of DSL that offers upload speeds almost identical as download speeds. This makes it optimal for businesses and server applications (P2P) where uplstream speed is important. SDSL may somewhat benefit gaming as well.