There are entire books written on magnetics design. The oldest well known volume is probably Lyman. Steve. karthick.murugan wrote: > what are the parameters desires these functionalities, > how can we focus on the individual functionality improvement, > for example if I need to improve the galvanic isolation alone what are the > changes we could do with that. > Is it any possible way there to be isolated improvement of these > functionalities. > > Karthick.M > > ----- Original Message ----- > From: "steve weir" <weirsi@xxxxxxxxxx> > To: "karthick.murugan" <karthick.murugan@xxxxxxxxxxxxxxxxxx> > Cc: <si-list@xxxxxxxxxxxxx> > Sent: Saturday, December 26, 2009 9:42 PM > Subject: Re: [SI-LIST] Regarding: Usage of Magnetics... > > > >> Ethernet magnetics serve five functions: >> >> Galvanic isolation >> Common mode suppression >> Level matching >> Transient energy transfer limiting >> Power feed ( PoE only ) >> >> If you do not need one or more of those functions, then you may find you >> meet your needs with simpler magnetics or no magnetics at all. You can >> for example obtain galvanic isolation and level matching with one properly >> chosen transformer. You will have to do homework with the chips you are >> using now and anticipate what you might use in the future to determine >> what the minimum is that you can get away with. >> >> Steve. >> >> karthick.murugan wrote: >> >>> Hi All, >>> I just need to clarify a small doubt on the usage of magnetics, >>> Whenever we are using Ethernet switch IC we should provide the magnetics >>> to the ports at the chip side. >>> Due to some reason like signal balancing, common-mode rejection, >>> impedance matching, and EMC improvement. >>> Consider, I am using one processor board and the respective rear board, >>> In that the magnetics outputs (twisted pair) are coming from the >>> processor board, and it could be connected with the Ethernet switch IC >>> that one I used in rear board through the rear connectors, >>> In Ethernet switch datasheet they mentioned all the ports should connect >>> with primary side of the magnetics. >>> My doubt is whether we could provide one more magnetics (because already >>> magnetics was given in processor board, that output is coming from the >>> processor board to rear board side) to the ports of Ethernet switch IC, >>> then connect to the processor side magnectics output, or there is no need >>> of magnetics, if the magnetics is not need for that case tell me reason. >>> >>> Best Regards, >>> Karthick.M >>> >>> >>> >>> **************** CAUTION - Disclaimer *****************This email may >>> contain confidential and privileged material for the >>> sole use of the intended recipient(s). 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