1. Electrical specs/info for 10baseT and 100baseT...
I'm trying to find information on the electrical specifications of
10baseT and 100baseT ethernet - voltage/current threshholds, signaling
methods, etc. I've spent most of the night browsing, and it appears
that the best source for this is going to be the IEEE 802.3 standards
While I order that, though, I figured I'd post a couple of questions
here, in the hopes that someone has the time to answer }:> .
What I gather so far as far as signaling goes is that there're
essentially three states. Dormant (no signal), a 0 bit (carrier pulse),
and a 1 bit (polarity-reversed carrier pulse). The link test piggybacks
(somehow) onto this.
Data signals occur at a maximum rate of 20 MHz. (I may have mixed
my units there, but the value seems right.)
The voltage is somewhere around 9V between the + and - data lines.
First question: Is there a better source for this sort of info than
the IEEE spec?
Second question: Is what I gather above about the signaling more or
less correct? Is there anything I'm missing?
Third question: if I understand right, there's no real need for
synchronization of the '20 MHz clocks', because the collision
detection takes care of worrying about that.
Fourth question: if I measure the number of carrier pulses (either
normal or reversed) on one of the data pairs over 1 second, will I
get a measure of the total amount of traffic on the segment (including
collision and link-test packets)?
Thanks for any information anyone can provide; I really appreciate it.
Dalvenjah FoxFire (aka Sven Nielsen) "The weapon which causes the most
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