Looks like they double the bandwidth to achieve greater speeds.
http://www.nwfusion.com/news/tech/20...echupdate.html
PS
my understanding is if they used same up/down speed it would be DSL2

) (A
is for asynchronous)
"Richard Sobey" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Mon, 20 Dec 2004 20:39:24 -0000, "Bobby" <(E-Mail Removed)> wrote:
>
>>My local PC World sells a Belkin modem/router, a BT modem/router (Voyager
>>2100) and a Netgear modem/router. Is any one of these better than the
>>other?
>>The Netgear is slightly cheaper (but not much) and it claims to support
>>"ADSL 2" whatever that is.
>
> No doubt someone else can provide much better information than I, but
> ADSL2, as I understand it, is ADSL with the same up/down speeds and
> higher overall speed. Basically ADSL on speed.