On Sep 7, 14:02, Mike Ford wrote:
> >It would have helped if the installers (before my time)
> >hadn't wire-tied the cat 5 runs to the nearest 110v A/C
> >lines... three-foot parallel runs, in fact...
>
> My house is done is untwisted bellwire, any kind of cat5 sounds like
> nirvana to me.
>
> CAT5 is shielded twisted pairs isn't it? Why would proximity to 60 hz ac
be
> a problem, or are the network cards just REALLY poorly designed
(rejection
> of common mode noise)?
Nope, Cat 5 is UTP -- UNshielded twisted pair. It has reasonable
common-mode rejection, but nothing is perfect. In long runs, such as you'd
find in a typical commercial building infrastructure, you'd notice quite a
difference if the UTP was too close to power cables. They're notoriously
noisy.
--
Pete Peter Turnbull
Network Manager
University of York
Received on Fri Sep 07 2001 - 18:32:32 BST