Hi All, I have to set up a full channel simulation model for optimization purposes. What I did in the past was to simulate each part of the channel (traces, connectors, footprints...) and then I measured every single part to verify the quality of the simulation model. If every part is ok, I combine them in a circuit simulator. This works great for measurement channels, meaning an SMA-to-SMA type of channel (acsessible end points). Now I have to do the same for an existing Rack mount high speed backplane based system (one that I didn't design). My big problem is, that I can not access the endpoints, because of the BGAs that are soldered to the board, thus I'm not sure how to measure the modules to verify the simulation. Does anyone have good ideas? I was already thinking about taking the BGA of the PCB and measure with probes, but I don't hav e good rework station to do so. Mit freundlichen Grüßen / Kind regards. Gert Havermann Signal Integrity Engineer > SI & CAE > HARTING Electronics GmbH & Co. KG > Marienwerderstraße 3 > D-32339 Espelkamp > > Phone +49 5772 47 857 > Fax +49 5772 47 179 > mailto:gert.havermann@xxxxxxxxxxx > http://www.HARTING.com > > > > -------------------------------------------------------------------------- Absender ist HARTING Electronics GmbH & Co. KG; Sitz der Gesellschaft: Espelkamp; Registergericht: Bad Oeynhausen; Register-Nr.: HRA 5596; persönlich haftende Gesellschafterin: HARTING Electronics Management GmbH; Sitz der Komplementär-GmbH: Espelkamp; Registergericht der Komplementär-GmbH: Bad Oeynhausen; Register-Nr. der Komplementär-GmbH: HRB 8808; Geschäftsführer: Torsten Ratzmann ------------------------------------------------------------------ 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