Hi, All, Sorry for my careless on the estimation. In my case, the estimated saturation length is about 180inch. (instead of 18in). Simulation solvers have verified the results. The far-end crosstalk keeps increasing with length if the coupled length is less than the saturation condiction, and keeping attenuation with length if greater than saturation length. Thanks for Istvan, Craig, Zhiping and Zhangkun's comment. BRs, Sogo Hsu, Foxconn ------------------------------------------------------------------ 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