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[sindi keesan <keesan AT sdf.lonestar.org>]

> I'm not David, but excuse me while I jump in and offer what I know. DSL = 
> digital subscriber line. This is a digital technology that allow phone 
> signals to be relegated to a certain frequency on the phone wire, and the 
> remaining frequencies to be devoted to other traffic like internet packets. 
> In short, it makes use of more of the bandwidth of a telephone line than an 
> analog signal alone can. ADSL = asynchronous digitial subscriber line. Same 
> as DSL, but allowing asynchronous connection (ok, so I'm not totally sure 
> what synchronous means when talking about electrical signals travelling over 
> a phone wire . . . :) ).

A web search told me that ADSL can mean asynchronous or assymetric digital 
subscriber line.  Assymetric means that data go faster in one direction, 
in this case download speed would be something like 1.5MB and upload speed 
only 128K-640K.  SHDSL = symmetric high speed, might send data at 2Mbps in 
both directions, for a business that can afford it.

asynchronous = sent one character at a time with start and stop bits