Increasing the speed of dial-up to that of cable -- possible?

R

Radium

Hi:

Quotes from http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371da8dc?hl=en&
:
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
Click to expand...

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?


Thanks,

Radium
 
R

Radium

It's called aDSL. Uses the same phone line as your analog modem. Go
search on Wikipedia or Google for info.
Click to expand...

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?
 
R

Radium

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?
Click to expand...

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?
 
N

Noozer

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?
Click to expand...

Dialup is not capable of anything close to cable internet speeds. To make
matters worse, if you are in an area where DLS or Cable internet is not
available, the quality of your phone lines is probably not as good as in the
highly populated areas.

If you want broadband speeds you need a broadband connection.
 
N

Noozer

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.
Click to expand...

Is this the idiot who likes to sit and listen to the modem tones from
Sweden?
 
K

Ken Whiton

*-* On Tue, 14 Aug 2007 00:26:29 GMT,
*-* In Article VE6wi.57571$fJ5.18340@pd7urf1no,
*-* Noozer wrote
*-* About Re: Increasing the speed of dial-up to that of cable --
possible?
Is this the idiot who likes to sit and listen to the modem tones
from Sweden?
Click to expand...

Netherlands, not Sweden. Yes.

Ken Whiton

FIDO: 1:132/152
InterNet: (e-mail address removed) (remove the obvious to reply)
 
K

kony

Hi:

Quotes from http://groups.google.com/group/sci.electronics.basics/msg/0c013cf5371da8dc?hl=en&
:


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?


Thanks,

Radium
Click to expand...

No, and you're "doing it again", drifting off into crazy
wasteful nonsense. If all they had to do to get broadband
cable speeds was modulate differently, they'd have done it
years ago. They did actually, but it had a cap too low to
make it marketable vs cable or ADSL.
 
K

kony

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?
Click to expand...

The answer is no, it can't. Plain old twisted pair bell
wire cannot retain the analog signal at the sufficiently
high frequencies necessary to come anywhere near ISDN, ADSL,
let alone *cable* broadband speeds.

If you had bothered to do some research you would know this.

I recommmend you do some basic, prerequisite learning of
basic core technologies before trying to bite off more than
you can chew. The building blocks of education are not
trying to invent some new thing when you don't even know how
the old things worked.
 
D

Dana

Radium said:
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?
Click to expand...

Why use a dial up modem when there is DSL/ADSL that does what you just
described.
 
D

Dana

Radium said:
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?
Click to expand...

You are an idiot
 
R

Reed

kony said:
The answer is no, it can't. Plain old twisted pair bell
wire cannot retain the analog signal at the sufficiently
high frequencies necessary to come anywhere near ISDN, ADSL,
let alone *cable* broadband speeds.

If you had bothered to do some research you would know this.

I recommmend you do some basic, prerequisite learning of
basic core technologies before trying to bite off more than
you can chew. The building blocks of education are not
trying to invent some new thing when you don't even know how
the old things worked.
Click to expand...

Even worse than the wire (local loop) is the analog bandwidth
restriction of 4Khz when a dial connection is carried over any Public
Switched Telephone Network(PSTN) via digital T-carrier equipment within
a 64K DS-0 channel. (and nearly 100% of calls are carried such today).

The "56K V.90" modem is a "hack" that tries to take advantage of such
connections.

--reed
 
L

Larry

Why don't you try it and find out?

Larry

: >
:
: 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?
:
 
R

Radium

The answer is no, it can't. Plain old twisted pair bell
wire cannot retain the analog signal at the sufficiently
high frequencies necessary to come anywhere near ISDN, ADSL,
let alone *cable* broadband speeds.
Click to expand...

Why can't telephone wires carry those high frequencies?
 

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