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Re: Re: Bargains(tm)
CCA wire should not actually be a problem for 100/1000 networking
because o=
f something called the skin effect which=20
causes signals to flow only the in the outermost 'skin' of a wire at high
f=
requency's. This skin depth in copper @=20
100Mhz is only 6.6=B5m and @1Ghz is 2.2=B5m, so along as the copper
plating=
is more than 10=B5m thick all the signal will flow=20
in the copper! For d.c. curents i.e. PoE the slightly higher resistance of
=
the aluminium may have an effect on long runs..
HTH
Stephen
<http://en.wikipedia.org/wiki/Skin_effect#Examples>
for details
On 05/02/13 09:54, severnsource wrote:
>
>
>
> --- In ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>,
"Tim" wr=
ote:
> >
> > Hi,
> > I have been looking at buying some cat5e too. I found this
> >
> >=20
> http://www.ebay.co.uk/itm/BRAND-NEW-ROLL-OF-305M-CAT5E-ETHERNET-NETWORK-C=
ABLE-UK-/260727061942?pt=3DUK_Computing_NetworkingCables_RL&hash=3Ditem3cb4=
8b3db6
> >
> > =A330 a box delivered. Didn't buy it, but worth considering!
> >
> > No connection etc.
> >
> > Tim.
> >
> It's cheap because it isn't copper. CCA is the weasel expression -
copper=
coated aluminium. It may well be perfectly=20
> OK for most purposes, but I'd be wary of it myself.
>
> There's lots of dodgy cat 5 on ebay. I got caught with some that was
so t=
hin there's no way it would meet the spec.
>
>=20
[Non-text portions of this message have been removed]
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