Has anyone had experience using Z0 of 51 ohms for PCI. Many devices only spec. max capacitance. 4.4.3.3. Impedance The unloaded characteristic impedance (Z0) of the shared PCI signal traces on the add-in card shall be controlled to be in the 60 . - 100 . range if the device input capacitance (Cin) exceeds 8 pF. If Cin is 8 pF or less, the range for Z0 is 51 . - 100 .. The trace velocity must be between 150 ps/inch and 190 ps/inch. Regards, Gary Levin MangoDSP 972 2 532 8706 ext. 219 fax: 972 2 532 8705 ------------------------------------------------------------------ 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 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