TELECOM Digest OnLine - Sorted: Re: Spectrum of a Modem Signal

Re: Spectrum of a Modem Signal

Tue, 09 May 2006 15:44:43 -0400 wrote:

> If I plot the spectrum of a short modem signal, what should I expect
> to see?

> It just looks like a lump in the frequency domain, but I'm not sure I
> did it right.

In a way over simplified explanation, most modems these days (dial up
for sure) transmit a series of tones all the time spaced fairly
closely together. These tones are twisted and shifted to allow each
one to carry multiple bit patterns. Thus a spectrum view would
typically show a "lump" of signals running all the time.

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