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
The difference between internet service provided by ADSL and internet provided by cable is in the method of delivery. ADSL is high speed internet which is delivered through one's home phone. Cable is broadband internet delivered, as is stated, through cables.
IDSL, SDSL, HDSL There is also G.SHDSL which has 5.3 MB symetrical
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
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Dialup is slow, ADSL is fast
a wireless router is needed when internet modem doesn't have wireless capability.
symmetrical DSL
ADSL.
3g is mobile internet and adsl is a type of home internet so adsl is better
ADSL is a way of using a pair of copper wires which is normally used for a phone line, to transfer high volumes of data. The copper wires were only originally designed to carry a phone call.Fibre optic cables are especially designed to transfer high volumes of data. They are made of glass, not copper wires.