Does anyone know of any studies detailing justification for using high performance PCB materials on boards other than back planes? I am concerned with thermal stability and group delay issues with using FR4 on boards implementing data rates up to and beyond 2 Gb/s. Regards, -- Chris Mesibov Sr. Hardware Engineer Fujitsu Network Communications, Inc. Phone:(845)731-2037 2 Blue Hill Plaza, 6th Floor Fax: (845)731-2011 Pearl River, NY 10965 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list Old list archives are viewable at: http://www.qsl.net/wb6tpu