[mythtv-users] Way OT: High-speed Data Service Delivery
Jay Ashworth
jra at baylink.com
Wed Jul 13 13:21:12 UTC 2011
----- Original Message -----
> From: "Ian Clark" <mrrooster at gmail.com>
> Sorry for diving in a bit here, and apologies for my ignorance, but
> surely the propagation speed over copper is approx the speed of light,
> and over fiber it /is/ the speed of light (in whatever medium the
> fibre is made of?)
In fact, not quite. The ratio is called Velocity Factor, and in some types
of coax, it can get down as low as 66% of c; it has to do with capacitance
and the dielectric material. In optical fiber, yes, I think it's about .99c.
http://en.wikipedia.org/wiki/Velocity_factor
Cheers,
-- jra
--
Jay R. Ashworth Baylink jra at baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII
St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274
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