Re: Cable

[Chris Hunter <cjhunter@xxxxxxxxxxxx>]

'checked to see what my patch cables are, for connecting our Macs :

3 off 1 metre ETL-verified TIA/EIA 568A-5 Cat5e UTP patch cable - made=20
by CTL

all of which is Double Dutch to me, I'm afraid !

'haven't used them yet, but 'am about to - to replace the cross cable=20
between the two desk-tops, and to link them  to the laptop & Airport=20
base station, all via a Bufalo hub ... need to load teh software first,=20
which I must get around to !

Chris



Alan Ainslie wrote:

> Cheap CAT5 is a problem in many respects I am afraid.  It often will
not
> support network speeds due to erratic impedance etc even when properly
> terminated and left in a coil.  You need to use a high-end Fluke or=20
> Wavetek
> analyser to see this but it is amazing that the stuff ever gets to=20
> market:
> the distributors clearly do not ever make any QA checks.
>
> When you put the cable into a real situation with bends etc problem is
> worse: think about 4 twisted pairs going round a bend, you can visual
ise
> either unwinding or tightening up of one or all of the twists if
the=20
> pairs
> are not securely supported: this is what gives impedance and crosstalk
> issues along the cable length.
>
> I assisted an installer recently who had a 5m run of CAT5.  Three=20
> pairs were
> electrically 5m: good news.  The fourth pair (and this was one of
the=20
> data
> pairs unfortunately) measured over 7m long electrically on the
Wavetek=20
> -bad
> news - and it did not work!
>
> Very safe bet everytime is Belden.  And if you are able to justify
over
> =A3100a box (still only 35p a metre!!) then I strongly recommend the
> 'nanotwist' cables as being not only very high performance and they
have
> very low differential skew so ideal for KAT5 etc etc, BUT they have=20
> bonded
> pairs which means that any cretin can take liberties with pulling
the=20
> cable
> and it still measures fine as the pairs cannot untwist on a bend.  So
not
> only works well, but physically easy to pull, and if it dies get=20
> snagged the
> performance holds up. Type number 7987R is typical of this class of=20
> cables
> and is probably the one to specify.
>
> PS  Simple but effective network tester available here if you don't=20
> fancy a
> mortgage for a Wavetek.  (Also does the buzzer tracers that were
posted
> about recently)
> http://www.the-max.co.uk/products/product_info.php?manufacturers_id=3D20&=
products_id=3D926&osCsid=3D2daa05b4f28dde5ed9ad6f2c1059daeeAlan=20
> <http://www.the-max.co.uk/products/product_info.php?manufacturers_id=3D20=
&products_id=3D926&osCsid=3D2daa05b4f28dde5ed9ad6f2c1059daeeAlan>=20
> Ainslie----- Original Message -----From: "Chris Hunter"=20
> <cjhunter@xxxxxxx>To: <ukha_d@xxxxxxx>Sent: Sunday,=20
> January 08, 2006 2:38 AMSubject: Re: [ukha_d] Cable> It was just
that=20
> I'd assumed I'd be going for the lowest price ... then> I saw
the=20
> price range was large, and the differences in attenuation were>
huge=20
> ... 20db & 200db at 100MHz ... they'd not be selling the
more>=20
> expensive types if it didn't matter ... but which should I choose ?=20
> ...> and now the snagging factor, too.>>
>
>
>
>
>
>
>
>
>
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