Log in

No account? Create an account
entries friends calendar profile Previous Previous Next Next
Useless fact for the day - Ed's journal
Useless fact for the day
Useless fact for the day.
The 'speed of light' down an optic fiber, is actually slower than the speed of light in a copper cable.

So if you get a CAT5 ethernet cable, and 'race' a signal with the same lenth of fiber optic cable, then the signal will reach the end of the CAT5 capble first.

Of course, the difference is largely negligable, given in both cases the speed of light is 'about' 2/3s C, which can be approximated as 'really really fast'.

The reason we use fiber optics is due to signal propagation, interference and shielding. Not because it's 'faster' then copper.

Oh, and the dollar is currently at 2.00520 to the pound. Which means it's a good time to do your shopping for stuff in dollars.
5 comments or Leave a comment
ash1977law From: ash1977law Date: April 17th, 2007 03:58 pm (UTC) (Link)
Ah, but is the delay due to having to convert the signal from photons to electrons?
sobrique From: sobrique Date: April 18th, 2007 09:23 am (UTC) (Link)
Nope, it's simply the fact that electronic signal propagation is faster than the speed of light down an optic fiber
zaitan From: zaitan Date: April 18th, 2007 08:31 am (UTC) (Link)
From what I recall, light does not travel in copper at all. Unless it is really bright and vapourises the copper to a gas.
sobrique From: sobrique Date: April 18th, 2007 09:21 am (UTC) (Link)
Well, no, but the signal propagation is what I was referring to.
planetpete From: planetpete Date: April 18th, 2007 08:32 am (UTC) (Link)

Hmm Usually ...

If that comment was made in the office the Chorus of "GEEK !!"

But this time I will applaude your Useless fact as brilliant.
5 comments or Leave a comment