Hi All, I've been reading a couple of these papers published on laminate induced skew of trace pairs. I know that several contributors to this forum are the authors of those papers and I would like to dig into this problem a little bit more. I am getting ready to build a backplane for a customer that has 40" of trace and mulitple pairs running between two connectors. They would like to reach 6.5Gbps on these traces but when I look at some of these published figures for just p-to-n skew I am worried about being able to have a reasonable eye opening at the receiver (without EQ or pre-emphasis). Can I take a poll from the community and ask who else has measured data for laminate skew? What did you see? How many people out there are running 40" or more at greater than 3.125 Gbps using FR4 (or similar material) with success? Did you compensate for laminate skew? Lastly, how much does a Rogers 4350 dielectric exhibit this tendency? Thanks, Bill ------------------------------------------------------------------ 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