I use BCM8011 and BCM5690 . When BCM5690 is in phy remote lootback = mode, I send 10G through 8011 to BCM5690 and get data from BCM5690 to = 8011 . When I send 1 million data packages ,I find 200 packages have = frame crc error in received datas. XAUI track length is about 15mm on = PCB.=20 Could anyone tell me some reasons and how to solve this problem ? =20 Thanks=20 ------------------------------------------------------------------ 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