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

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. =20

Thanks,
Prakash.=20

-----Original Message-----
From: Chris Padilla (cpad) [mailto:cpad@xxxxxxxxx]=20
Sent: Monday, February 27, 2006 1:20 PM
To: Chauhan, Prakash; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Integrated vs. discrete magnetics for Ethernet

Tell us what Phy vendor you are planning to use: Marvell or Broadcom or
???

Chris Padilla
Cisco Systems
San Jose, CA=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

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.

Thanks,
Prakash.
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