Myan- I think this is one of those questions that isn't going to be answered to your satisfaction on si-list. There are probably hundreds or thousands of things that _could_ be wrong. Open ended inquiries like you have posed without a whole lot more data on exactly what is going on are difficult to answer with any real degree of accuracy. If the problem seems to be beyond your area of expertise perhaps hiring a consultant who is an expert in the field would be a cost and time efficient solution to your problem. You could get your immediate problem resolved and probably learn a whole lot about the topic in the process. Regarding the transformer question, have you looked at the Pulse catalog or datasheet? -Ray Anderson myan@xxxxxxxxxxxxxx wrote: > I design a board . There are 6 Gigabit ports (1000base-T) on it. And = >there is no problem to send packets to smartbits . But when smartbit = >sends packets to these Gigabit ports, there are a lot of error packets = >received by these ports . Could anyone give me some help ? =20 > > And I want to know if Pulse transformer 5054 is for 10/100/1000 base-T = >? =20 > =20 > Thanks! > > > ------------------------------------------------------------------ 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