🚀 go-pugleaf

On Aug 13, 4:27 pm, Radium <gluceg...@gmail.com> wrote:
> On Aug 13, 4:21 pm, "Vanguard" <vangu...@mail.invalid> wrote:
>
>
>
> > "Radium" <gluceg...@gmail.com> wrote in message
>
> >news:1187045374.227004.161110@g12g2000prg.googlegroups.com...
>
> > > Hi:
>
> > > Quotes from
> > >http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371...
> > > :
>
> > >>Multiple-level quadrature modulation,
> > >>"constellation modulation",
> > >>is most common for packing
> > >>lots of bits per Hz of bandwidth.
> > >>The more you pack,
> > >>the better the s/n ratio has to be.
>
> > >>http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
>
> > >>http://en.wikipedia.org/wiki/Constellation_diagram
>
> > > Does this mean that Quadrature Modulation and Constellation
> > > Modulation
> > > can be used -- at least in theory -- to give dial-up modem
> > > connections
> > > around the same fast speeds provided by Broadband cable modems?
>
> > It's called aDSL.  Uses the same phone line as your analog modem.  Go
> > search on Wikipedia or Google for info.
>
> Does ADSL also make the sounds associated with the dial-up modem --
> i.e. the sounds that result as a computer connects to the net via its
> dial-up modem?

OOPS! I forget that those sounds only occur on analog modem. ADSL is
obviously digital.

My question was can Quadrature Modulation and Constellation Modulation
allow analog dial-up modems to have the same speed as cable modems?
Not any kind of DSL, just analog.

Can the analog phone line make use of the above two modulations
schemes to achieve cable-modem speeds at the voiceband frequencies
used by the analog dial-up modem?