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