"Jim H" wrote in message
...


There is indeed a wealth of crap on that website, but this isn't it.

Digital signals are in fact no different to any other signals, and
they are most assuredly analogue.

For a very simple network pulses will be put direct onto the wire, eg
at
any time it will be either 0v or 5v, and nowhere imbetween, this will
create the square wave that is sometimes called a digtal signal.
I don't think this is quite correct even for the most basic pulses. If
you examine a "digital signal" at a high resolution you will see
"ringing" occur when the voltage changes so the signal isn't either 0v
or 5v but an approximation of a square wave such as

http://mathworld.wolfram.com/Fourier...quareWave.html

The signal becomes "digital" because the resolution of the receiving
equipment is set such that the subtle variation per cycle is not
detectable or is ignored.


--
RobH
The future's dim, the future's mono.