My guess is that someone is trying to provide you a via model suitable for typical simulations that have a single victim with 2 aggressors. The model may or may not have significant coupling between the aggressors and victim - the "aggressors" may simply be copies of the 2-port model. The way to check is to shoot a signal into one of the ports and check the amplitude on the other ports. If they're all approximately the same (and equal to the input amplitude), you have the via configuration described below. If only one is approximately equal to the input amplitude, and the other 4 are significantly less (or zero), you have the scenario I'm describing. Just guessing though... If it's truly someone providing a via model for a star configuration, I would question their wisdom/sanity - the via effects are going to be trivial compared to running 5 T-lines out of a single point. Obligatory Disclaimer: The content of this message is my personal opinion only and although I am an employee of Intel, the statements I make here in no way represent Intel's position on the issue, nor am I authorized to speak on behalf of Intel on this matter. Jeff Loyer -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Ihsan Erdin Sent: Wednesday, August 30, 2006 5:58 PM To: dsaras68@xxxxxxxxx Cc: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: 6 port via Dharmendra, If the signal has a star configuration distributed from a through-hole via -possibly on different signal layers- a multiport via makes sense to me. Regards Ihsan On 8/30/06, dharmendra saraswat <dsaras68@xxxxxxxxx> wrote: > > I always thought that a via is a two-port device, till I encountered the > term '6 port multilayer via'. Can somebody throw light on how could a via be > made to have more than 2 ports. > Thanks > > Dharmendra > > > --------------------------------- > Do you Yahoo!? > Everyone is raving about the all-new Yahoo! Mail. > > ------------------------------------------------------------------ > 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 > > > ------------------------------------------------------------------ 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: =20 //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 =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