Was "Re: FWD: RE: EASY ?? FOR MOST OF YOU"
>At 03:37 PM 1/22/01, Jack Williams wrote:
>
>>The propagation delay for Ethernet must not be greater than 512 bit
times or
>>you'll get late collisions (as Tim said). Since the speed of light is
>>constant and 10-baseT bits last 10 times longer than 100-baseT bits,
that
>>directly influences how long of a cable you can run!
>>
> >That sounded like Nonsense, didn't it?
The technological myth that electrons propagate at the speed of light is
certainly false. Electronic drift is a fraction of the speed of light
(in a vacuum = approximately 300 million meters per second) and is on
the order of centimeters or meters per second , depending on the
electronic pressure through the wire (aka, "voltage").
Some of the more knowledgeable may be shocked (pun intended) to learn
that even electronic signal propagation (not the same as actual movement
of electrons through a wire) proceeds at far below the speed of light in
a vacuum, some say half the speed, other sources claim one-fifth the
speed, and of course this does not take into account line impedance,
heating effects, etc.
Jonathan
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