Analog audio vs. modulated digital bit streams.  Crosstalk does affect
telephone, your eardrum is more capable of dealing with it than an
ethernet phy tends to be.

Same reason dsl tends to suck vs. cable - you can only do so much with
unshielded, possibly untwisted phone wires.  Legacy 2-wire pots was
never originally designed with data transmissions in mind.  Cat3 was
really built more as the first utp alternative to thick/thinnet shielded
coax.  Each cat variety is rated for a certain mhz, meaning that you can
modulate greater bitstreams across the medium, providing more
throughput.

cat3 - 16mhz (analog mostly, otherwise 10base ready)
cat5 - 100mhz (100 base)
cat5e - 100mhz (100base, but sorta gigabit ready)
cat6 - 250mhz (gigabit)
cat6e - 500mhz (gigabit, 10g ready)
cat7 - 600mhz (10g)
cat7a - 1000mhz (10g, 40g ready)

-mb


On Wed, 2009-07-22 at 13:37 -0400, mike havens wrote:
> all I need it for is patch cables... and telephone cables. Why doesn't
> crosstalk affect the telephone signal?
> 
> On Wed, Jul 22, 2009 at 12:50 PM, Technomage
> <technomage.hawke@gmail.com> wrote:
>         
>         mike havens wrote:
>         > I got some phone cable (green & red/yellow & black). Could I
>         use it for
>         > ethernet cable (blue, green, orange, brown)? Which pins
>         would I connect it
>         > to if so? I would think red would go to dark blue and and
>         green to
>         > light/striped blue. then bablesxlack would  go to dark
>         green  and yellow to to
>         > light/striped green. I'm hoping that it is like a phone
>         where two of the
>         > lines are used and the other two are useless. Let me know!
>          Thanks
>         >
>         
>         A: no. Phone cable is typically cat-3 quality. the windings
>         are
>         different and bandwidth far less.
>         you might get away with using it as a 3 foot patch cord, but
>         the
>         creosstalk you'd get would
>         cut throughput enormously.
>         
>         
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> 
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