[SI-LIST] Re: Why shielded twisted-pair is still twisted?
- From: Neo <neoflash2008@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Mon, 10 May 2010 16:07:04 -0700 (PDT)
Steve,
I agree that twisting will make the cable more balance if the shielding is
ideal. However, I think twist will make the shielding more difficult to be
uniform along the cable. Therefore, impact impedance's consistency.
Is it true?
Neo
--- On Mon, 5/10/10, steve weir <weirsi@xxxxxxxxxx> wrote:
From: steve weir <weirsi@xxxxxxxxxx>
Subject: [SI-LIST] Re: Why shielded twisted-pair is still twisted?
To: "Neo" <neoflash2008@xxxxxxxxx>
Cc: "List Si" <si-list@xxxxxxxxxxxxx>
Date: Monday, May 10, 2010, 10:53 PM
STP is not twin ax. STP do not have individual shields. Twisting makes
the parasitics more isotropic.
Steve
Neo wrote:
> Hi,
> I'm thinking about why shielded twisted-pair is still twisted?
> Pair is twisted for controlled distance/impedance (due to twist) and for
> x-talk reduction. If a pair is already shielded together, it is not necessary
> to twist them any more.
> Without twist, it will be equivalent to twin-ax cable, isn't that better?
> Thanks,Neo
>
>
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Steve Weir
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