sheilded Cat-5
colin rasor
" linuxnet"@home.com
Sun, 02 Jul 2000 03:41:01 -0700
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Gene Holmerud wrote:
> A little more clarification:
>
> 1) Token ring cable can be twisted-pair or shielded. The sheilded
> form is two pairs of wires, each pair is wrapped in foil to prevent
> crosstalk to the other pair. It's actually a current loop scheme,
> hence the realitively heavy conductor (#20 comes to mind).
>
> 2) Cat-5 is unshelded, four pairs of wires twisted. Each pair has a
> different number of twists per foot, which helps minimize the
> crosstalk problem. And there are standards as to which connector (RJ-
> 45) pin number each wire connects to, so that the pairing comes out
> right. Cat-5 can be used for Ethernet. Unshielded twisted pair can
> also be used for Token-ring, but this T-R must be supplied a small
> amount of power at hubs since it's current carrying ability is
> ziltch. Mike mentioned CAT-4 UTP was for T-R and that's a new nerdle
> of wisdom for me.
>
> Gene
>
> From: "Mike Sheldon" <msheldon@desertraven.com>
> To: <plug-discuss@lists.plug.phoenix.az.us>
> Subject: RE: sheilded Cat-5
> Date sent: Thu, 29 Jun 2000 21:49:34 -0700
> Send reply to: plug-discuss@lists.plug.phoenix.az.us
>
> > >>When I say twisted, the cables are definently twisted around each other.
> >
> > Ahh, you're talking about stranded wire vs. solid core. Either one can be
> > certified CAT-5, but be sure that the connectors are for stranded wire. Most
> > are for solid wire, and there is a difference.
> >
> > I've still never seen shielded CAT-5 before. I'm not saying it doesn't
> > exist, but be sure that the wire actually is CAT-5, and not CAT-3 or CAT-4.
> >
> > Michael J. Sheldon
> > Internet Applications Developer
> > Phone: 480.699.1084
> > http://www.desertraven.com/
> > PGP Key Available on Request
> > -----Original Message-----
> > From: plug-discuss-admin@lists.PLUG.phoenix.az.us
> > [mailto:plug-discuss-admin@lists.PLUG.phoenix.az.us]On Behalf Of colin rasor
> > Sent: Wednesday, June 28, 2000 20:00
> > To: plug-discuss@lists.PLUG.phoenix.az.us
> > Subject: Re: sheilded Cat-5
> >
> >
> > Thanks Mike
> > The wire is going in a machine shop.
> > Mike I might be a little confused, (please correct me if I am wrong.) When
> > I say twisted, the cables are definently twisted around each other. The
> > copper wire inside is not twisted and is solid, is this Cat4? Also the Wire
> > that I have seen that claims to be shielded is coated in a foil type
> > substance with a bare wire running on the outside of it. Of course this is
> > all incased in you typical blue (or color of choice).
> > The reason we worry about using "shielded" is that that we don't want to be
> > losing any data do to RF while it is running through the shop.
> > Conduit would be about the same price to run with labor. As the so called
> > shielded wire.
> > Thank you again for you input.
> > Colin Ansel Rasor
> >
> > Mike Sheldon wrote:
> > Cat-5 isn't Cat-5 unless it's twisted, the twists are what prevents
> > interference between the pairs, as well as from outside sources.
> > As far as shielded Cat-5? I've never seen such a thing. There was a shielded
> > twisted pair that IBM used for token-ring, but that's Cat-4. Cat-4 is NOT
> > rated for 100mbps
> > Shielded Pros: Less outside interference in extremely noisy (electrical)
> > areas.
> > Unshielded Pros: 100mbps, much cheaper, resistant to electrical noise in all
> > but the worst environments when properly installed.
> > Use Cat-5 unless you're wiring a machine shop. If you're wiring a machine
> > shop, run Cat-5 in metal conduit.
> > Michael J. Sheldon
> > Internet Applications Developer
> > Phone: 480.699.1084
> > http://www.desertraven.com/
> > PGP Key Available on Request
> > -----Original Message-----
> > From: plug-discuss-admin@lists.PLUG.phoenix.az.us
> > [mailto:plug-discuss-admin@lists.PLUG.phoenix.az.us]On Behalf Of colin
> > rasor
> > Sent: Wednesday, June 28, 2000 17:03
> > To: plug-discuss@lists.PLUG.phoenix.az.us
> > Subject: sheilded Cat-5
> > Hello everybody,
> > I was wondering the best place to buy shielded cat5 non twisted. I am
> > looking for around 2000ft.
> > What are the pros to using shielded compared to non shielded?
> > Colin Ansel Rasor
> > _______________________________________________
> > Plug-discuss mailing list - Plug-discuss@lists.PLUG.phoenix.az.us
> > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discussthanks
> >
> >
> > _______________________________________________
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>
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Gene,
Thank you for the information.
Colin Ansel Rasor
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