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 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu