Just to clarify, We did have different trace widths for 50 SE (9 mils wide) and 100 Ohm Diff (7 mil Trace, 7 mil space). We asked for +/- 10% on each. I am not particularly worried about the single ended traces since that was not based on any real requirement, just general design practice. I am concerned about the LVDS video. We do not have time to re-spin the boards right now, so we are going to use them to prove the design and replace them when the logical design is confirmed. Customer is throwing BIG rocks at us because of schedule. I am very concerned about the quality of the board houses, especially when they told me that they have trouble with 10% impedance specs. I am trying to get a new quick-turn board house qualified, but I seem to have stepped right in the middle of a political mine field. Oh well, I did go from a tine company to a larger one to gain this kind of experience, however uncomfortable it is. I have turned it over to quality to deal with but that isn't a near term fix. My real question was how to determine what the impact would be. A number of people have recommended free/open source tools. This is a new area for me. Anyone got a collection of tools and/or methodology for a person just starting in SI? Clayton Wrobel __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.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 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