Ryan,
Proper layout is the fix, the transformer has the straddle signal
ground and
chassis ground planes. These planes should never overlap.
Another trick I found is to stitch a 2kV/0.001micro farad SMD capacitor
across sig gnd and chassis gnd.
Hi Jim – Yes that is a typical Ethernet frequency! BTW I’d be interested
in the fix!
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Knighten, Jim L
Sent: Friday, November 21, 2008 2:17 PM
To: emc-p...@ieee.org
Subject: 375MHz from 10/100Base-T
frequency! BTW I’d be interested
in the fix!
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Knighten, Jim L
Sent: Friday, November 21, 2008 2:17 PM
To: emc-p...@ieee.org
Subject: 375MHz from 10/100Base-T
I am experiencing a robust radiated emission
AM
To: Grasso, Charles; Knighten, Jim L; emc-p...@ieee.org
Subject: Re: 375MHz from 10/100Base-T
Jim - Interesting topic!
Have you looked into the various sub circuits?
Does the hardware have separate MAC and Net Phys? (common configuration)
If yes then what is the interface? Plain vanila MII
...@honeywell.com
Subject: RE: 375MHz from 10/100Base-T
To: Knighten, Jim L jim.knigh...@teradata.com, emc-p...@ieee.org
Date: Friday, November 21, 2008, 4:35 PM
375 MHz is a third harmonic for 100BaseTX.
The primary frequency for 100BaseTX
I am experiencing a robust radiated emission at 375 MHz from a rack containing
various computing hardware. This seems to come from Ethernet 10/100Base-T
switches, cables, etc. Have others experienced this frequency with Ethernet
hookups?
Jim
__
James L. Knighten, Ph.D.
To: emc-p...@ieee.org
Subject: 375MHz from 10/100Base-T
I am experiencing a robust radiated emission at 375 MHz from a rack
containing various computing hardware. This seems to come from Ethernet
10/100Base-T switches, cables, etc. Have others experienced this
frequency with Ethernet hookups?
Jim
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