Re: [hackers-il] Re: Fwd: The case of the 500-mile email.
- Shlomi Fish <shlomif@...> writes:
> What if everything that connected these networks were fiber opticsThere are two factors (at least) that affect the speed of
> Point-to-Point lines? Maybe they have a close to vacuum light-speed.
propagation. One is the material filling the fiber, and the other is
geometry. Just the second one would reduce the group velocity. The
material in fiber is some sort of glass. I don't know what its
refraction index is (anyone?). The refraction index of the ordinary
glass is about 4/3, meaning that the speed of light in the glass is
> BTW, from what I remember from my studies, the speed of light withinThis can be the case for phase velocity, not group velocity, which is
> certain materials can exceed the speed of light within vacuum, for some
> particular frequencies.
the one we are discussing here (to make the long story short, it is
the one that determines how fast information can be transmitted by
> Still passing information from one point to anotherYep, and that's what matters.
> can only be done at the speed of light.
Oleg Goldshmidt | ogoldshmidt@...
First binary search algorithm - J. Mauchly, 1946
First correct binary search algorithm - D.H.Lehmer, 1960