Hi all, Normally, we are advised to have horizontal, vertical and diagonal traces in PCB not any angle. Even grater than 135 degree corners in traces are asked to avoid. Is this due to trace boundary line smoothness issue in manufacturing (say aperture control) or something else? Thanks, Sengo ----- Original Message ---- From: agathon <hreidmarkailen@xxxxxxxxx> To: si-list <si-list@xxxxxxxxxxxxx> Sent: Thursday, August 30, 2007 5:30:25 AM Subject: [SI-LIST] fiber-weave effect alive and well? * I've reviewed DesignCon 05,07 material on fiber-weave effect. * A 10G (802.3ap) PHY vendor claims their demo setup used FR408 (Dk/Df = 3.77/0.012) for backplane sections and a total channel of 1meter. * FR408, as far as I know, still has the basic weave/resin construction, though perhaps less Dk delta. Q: 1. Huh? What happened? Did the PHY vendor call in the wizard kids from Hogworts? What is the current reality? 2. Any knowledge of Rogers4350? Ie: a different construction? Weave effect? 3. Up to date publications on this? (Besides references in the above DCon material.) Also, I see no mention of the weave effect on authoritative things from 802.3ap people on commsdesign or elsewhere, from 2004 on. --- ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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 ____________________________________________________________________________________ Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase. http://farechase.yahoo.com/ ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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