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James Knott wrote:
> John Andersen wrote:
>> On Thursday 07 June 2007, James Knott wrote:
>>
>>>> If I remember correctly shielding is a two way thing, basically you are
>>>> running a potential 40ft radio aerial in the latter case. If you have a
^^^^^^^^^
>>>> lot of cables or have anything which is sensitive to radio emissions
^^^
>>>> close by, Cat 6 starts making sense.
^^^^^^
>>>>
>>> ????
>>>
Clarifications
'potential' not actual, I have come across scenarios with old battered
bits of wire holding things together, and the more the thing twists,
turns and gets squeezed the worse the issue becomes. Of course the odd
nail through the wire makes life more interesting... :-)
By a lot, I mean bundles of wires not loads of single wires (apparently
cabling spaghetti is a good thing and neatly parallel bundles are not).
I remember a report in institution I worked for, of a rather expensive
bit of research kit which after installation started apparently randomly
recalibrating itself. It was only when someone had the bright idea of
checking the local train timetable, it was realised recalibration
coincided with certain electric diesel services on a train line about
100m from the location of the equipment. Electrical interference can be
an issue in all sorts of odd ways.
The CAT6 does have a significantly better crosstalk specification. NEXT
spec of 44.3db as against 35.3db, as this is a logarithmic measure, in
this case I think this means that CAT 6 should be approx. twice as
effective as CAT 5 in this area. The spec seems to be aimed at GigaByte
ethernet and is rated at 250MHz (I assumed this indicates use of all
eight wires for this purpose).
CAT 5e is apparently (a not really defined) standard, with some
additional specs on the crosstalk department defined.
For home use CAT5 would probably be adequate in most cases, though when
one starts talking lots of longish cable runs WiFi makes more sense.
> Yep, up to 100M or about 330'.
>
>
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