[EMAIL PROTECTED] wrote:
> > My computer, which
> > transmits loads of data down SCSI, IDE, even parallel and phone cables,
> gets
> > by fine with plain old wires.
Well, for IDE (in UDMA/66 mode) it's 66Mhz over a 60 cm long cable. SCSI
supports even higher frequencies over an even longer cable. Unless you
start using fire-wire or other hot technology disk applications, you'll
never see optical connections inside a PC.
Compared to TosLink, TosLink supports bit rates up to 6 Mbit/second. This
signal is modulated using light. Using a red LED with a wavelength of
650nm, the signal while 'bounce' about one and a half milion times in a 1
meter cable before ariving at the end.....
A coaxial connection at 6Mbit using a 6Mhz carier, has a wavelenght of
about 50 meters..... Ie, you can use a two wire connection up to 12.5 meters
before you'll get strange artifacts in the signal due to the reflections
and termination of the signal itself! THe only reason to use coax in this
application is for the better shielding!
Cheers,
Ralph
--
=======================================================================
Ralph Smeets Functional Verification Centre Of Competence - CMG
Voice: (+33) (0)4 76 58 44 46 STMicroelectronics
Fax: (+33) (0)4 76 58 40 11 5, chem de la Dhuy
Mobile: (+33) (0)6 82 66 62 70 38240 MEYLAN
E-Mail: [EMAIL PROTECTED] FRANCE
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"For many years, mankind lived just like the animals. And then
something happened that unleashed the powers of our imagination:
We learned to talk."
-- Stephen Hawking, later used by Pink Floyd --
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