I would be interested in reading a paper that demonstrates measured jitter hit from fiber weave, i.e. apples-to-apples comparison for a specific application with and without the fiber-trace alignment. Anyone have a good reference? Greg Edlund Senior Engineer Signal Integrity IBM Global Engineering Solutions 3605 Hwy. 52 N, Dept. HDC Rochester, MN 55901 gedlund@xxxxxxxxxx > [Original Message] > From: agathon <hreidmarkailen@xxxxxxxxx> > To: si-list <si-list@xxxxxxxxxxxxx> > Date: 8/29/2007 5:47:36 PM > 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