[SI-LIST] Re: Floating Cable Shield

Hello Ivor,

Is it possible for you to send us a pic or the link of manufacturer for
this cable?  I am curious to see how it looks.

Regards,

Shawn Nikoukary                 Cadence Design Systems
Sales Technical Lead            2655 Seely Ave, MS 9B2 =20
Silicon Package Board Division  San Jose, CA 95134 =20
Office (408) 944-7328           Cell (408) 712-1073 =20
Email: shawnn@xxxxxxxxxxx       Fax (408) 944-7772

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ivor Bowden
Sent: Wednesday, October 11, 2006 8:29 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Floating Cable Shield

Hi,

I ran into what I thought was an interesting cable and am looking for=20
comments. This is an IDE cable on a new PC I got. The construction is=20
twisted pair ribbon cable (flat spots for IDCs between the twisted=20
sections), about 20" long, IDC both ends, a 3rd IDC about 7" from one=20
end. What makes the cable interesting to me is there are two braided=20
shields covering the bundled twisted pair sections, one about 8", the=20
other about 3.5". These shields have no connections, not to a drain=20
wire, not to each other and to to any circuit or frame ground, they are=20
entirely floating. My question is, how effective is this type of=20
"floating" shield, in terms of SI and EMI?

This also brings up the general question of cable shield termination,=20
circuit/chassis ground at both ends v.s. one end only v.s. floating;=20
what characteristics to expect in each case?

And that brings up the specific question of shield return treatment in=20
the connector area, single drain wire v.s. complete enclosure?

Thanks,

Ivor Bowden
Hardware Engineer
Curtiss-Wright Controls Embedded Computing
Video and Graphics
San Diego, CA 92121


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