ADSL is simply a version or 'flavour' of DSL. The 'a' refers to asymmetric, meaning 'not the same'. Hence, ADSL usually has different downstream and upstream rates (e.g. 1536/256 is a common speed of ADSL available in Australia, where downstream the link speed is 1536kbps and upstream is 256kbps).
Check out the Wise Geek website for an explanation. Link is below: http://www.wisegeek.com/what-is-the-difference-between-dsl-and-adsl.htm
ADSL and VDSL
ADSL and VDSL
ADSL and VDSL
Speed is the difference between HDSL and ADSL. HDSL has high upload and download speeds whereas ADSL has a slow upload speed coupled with a high download speed.
ADSL and VDSL
Asymmetric DSL (ADSL)
Digital Service Line Access Multiplexer.It's the box in the exchange that connects between the telephone system and your Digital Subscriber Line (DSL), usually Asynchronous DSL (ADSL).
Speed, mainly. Broadband (cable internet) is going to be much faster than DSL.
DSL is considered to be broadband speed. There is a difference in speed between DSL and Cable. Cable is generally much faster.
Asymmetric dsl (ADSL) Rate-adaptive DSL (RADSL)
adslIt's ADSL (Asymmetric Digital Subscriber Line).Typically, ADSL (Asynchronous DSL).There may also be SDSL (Synchronous DSL), but this is not used in most of the US anymore.There is also GDSL and FoDSL. These are very rare.