[SI-LIST] Re: Integrated vs. discrete magnetics for Ethernet

Well I suppose this is another case where "it depends".
We have a system with an Ethernet integrated magnetics that
passed with >10dB of margin to ClassB with the ENet running
at full bore.

Now - we only use one connector...anyone from Cisco and
involved in EMC on this list care to comment??

Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Jai Shanker
Sent: Monday, February 27, 2006 10:34 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Integrated vs. discrete magnetics for Ethernet


Its probably LXT PHYs from Level One that Intel has
used in its previous chips and not Marvell.

I think the jacks come in different versions with
1:1.25 or 1:1 ratios as required for different PHYs.
We used the integrated jack in a prototype but didnt
go for any EMC compliance tests so I have no further
info on this.

regards,
Jai

--- "Chauhan, Prakash" <pchauhan@xxxxxxxxxxx> wrote:

> This is an Intel PCI Express based Gigabit Ethernet
> Controller.  The Phy
> is integrated.  I think Intel had integrated
> Marvell's Phy on some chips
> in the past, but I don't know whether this device is
> different. =3D20
>=20
> Thanks,
> Prakash.=3D20
>=20
> -----Original Message-----
> From: Chris Padilla (cpad)
> [mailto:cpad@xxxxxxxxx]=3D20
> Sent: Monday, February 27, 2006 1:20 PM
> To: Chauhan, Prakash; si-list@xxxxxxxxxxxxx
> Subject: RE: [SI-LIST] Integrated vs. discrete
> magnetics for Ethernet
>=20
> Tell us what Phy vendor you are planning to use:
> Marvell or Broadcom or
> ???
>=20
> Chris Padilla
> Cisco Systems
> San Jose, CA=3D20
>=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Chauhan, Prakash
> Sent: Monday, February 27, 2006 10:00 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Integrated vs. discrete magnetics
> for Ethernet
>=20
> Hi All,
>       I was wondering if anyone has comments regarding
> the use of
> integrated magnetics (In the RJ-45) versus a
> discrete implementation
> (for 10/100/1000 Base-T).  I have been advised that
> integrated magnetics
> have poorer shielding (between diff pairs) and can
> be problematic from
> an EMC compliance standpoint.  I would much prefer
> to use integrated
> Magnetics for space conservation and to have less
> component count and
> simplify layout.  If anyone has had problems with
> the Integrated
> Magnetics I would love to hear about it. (I am
> planning on using Belfuse
> Magjack family part:  0826-1X1T-23-F).  Any appnotes
> that can help
> implement this from a compliance standpoint would be
> greatly
> appreciated.
>=20
> Thanks,
> Prakash.
>
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