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Modems communicate with each other via audio
frequency waves modulated by the digital input from the PC. The audio
signal is called the carrier signal. The modulation (or change) to the
audio signal can be accomplished by changing the amplitude, frequency, or phase
of the audio signal. How FAST these changes occur is the "baud
rate". Baud refers to the number of these changes occurring in the
signal.
Suppose we transmit an 1800 Hz. signal and change
it to 1900 Hz. If we change it 2400 times per second, this is 2400
baud. If each change in frequency represents 1 bit, we have 2400
bps. At the same time we can change the amplitude of the signal. By
using 4 different amplitudes we can carry two bits (called a dibit) or 3 bits
(called a tribit) at a time by using 8 different amplitudes.
In addition we can change the phase of the
signal. For example we could use 8 phase angles and 2 amplitude changes to
create 16 different signals. With 16 signals we can send 4 bits at a time
(a quadbit, I'm not making this up). Then if we have an 1800 Hz. signal
and change that signal at 2400 times per second (2400 baud) we can transmit 9600
bps. (2400 x 4). By building up combination of amplitude, phase shift, and
baud modems reach the desired speed.
Unfortunately this has no relevance to a T-1 (or
DSL) since they do not use modems.
Good luck and good trading,
Ray Raffurty
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----- Original Message -----
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black">From:
User
&
To: <A title=realtraders@xxxxxxxxxxxxxxx
href="mailto:realtraders@xxxxxxxxxxxxxxx";>realtraders@xxxxxxxxxxxxxxx
Sent: Tuesday, July 02, 2002 5:14
PM
Subject: Re: [RT] GEN: TRADING LINES: T-1
& DSL
A T1 line's roughly equivalent to a 1,544,000 baud rate,
which is bits(1 character = 16 bits) per second, in this case between your
computerand your ISP's computer. Although your baud rate's as low as
theslowest connection between any two computers carrying your signal
overthe internet, including that other end's connection to the
internet,you're unlikely to see anything nearly as low as a 300 baud
rate. Youmight see more like 300 KBytes (8 bits = 1 byte) per second
withsomething like a cable modem instead!Hope that
helps,On Tue, 2002-07-02 at 12:41, charles meyer wrote:>
Group-> > Would anyone care to tap out a few comments on the
technical difference?> I was told that a T1 line is just a 1.544 MB
line. (Not sure what those> numbers mean though<g>)>
> I'm told that if the other end as a 300 baud moden; its still 300
baud,> etc...> Does my confusion make any
sense?<g>> > chas> > > > To
unsubscribe from this group, send an email to:>
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