Thanks to all who replied :-) All replies confirm this should be OK, I expected as much, but it is good to have consensus! Ivor on 11/14/2007 7:43 AM PDT Ivor Bowden wrote: > Any reason why not to locate the PCI Express coupling caps at the > receiver on a system board implementation? I know PCI Express Base > Specification section 4.3.1.2 calls out "The requirement for the > inclusion of AC coupling capacitors on the interconnect media is > specified at the Transmitter", but there are no specific placement rules > except the specifications for separate host / card module require that > physical division. Based on the recent "AC Coupled Signals" thread, it > would seem reasonable to place the capacitors at the receiver on a > system board, allowing the advantage that the mounting pads could be > used for probing - eliminating the necessity of separate test points at > the RX end. > Thanks, > Ivor Bowden > Hardware Engineer > Curtiss-Wright Controls Embedded Computing > ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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