Talk:Baseband

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does ethernet use baseband signaling?

Yes, it does. Although we don't have that piece of information in an article so far as I can tell. See Ethernet and IEEE 802.3. -Splash^talk 17:54, 14 February 2006 (UTC)

Not necessarily. The orignal Ethernet used "Manchester coding", which can be viewed as shifting the theoretical 5 MHz baseband of 10 Mbps data up to a carrier frequency of 10 MHz, so the band occupied can be as narrow as 5 to 15 MHz. Due to AC coupling with capacitors and/or transformers at various points, moving the peak of the data spectrum up from 0 to 10 MHz is helpful. This, however, is but one physical implementation of Ethernet. Others such as 802.11 shift it up to RF, of course. Dicklyon 16:30, 19 August 2006 (UTC)

CISCO state the the "base" in 10Base-T refers to baseband and by inference surey this means Ethernet uses baseband.

[edit] Intro

Let's work on a good opening sentence and definition (current version uses "comprises" in the typical incorrect way, and doesn't get to the point very specifically). It would be good to at least admit that any kind of Fourier analysis gives negative frequencies, too. For real signals, these are just reflections of the positive, not new information, so they are conventionally ignored. And the "RF" spectrum needs to reference double sideband and/or single-sideband modulation to explain where this comes from. I'll see if I can help. Please comment on my attempts. Dicklyon 16:30, 19 August 2006 (UTC)