Hi Bob, Is it broadband noise? Maybe a DC-DC converter on the board? Or do you have a peak at 62.5MHz? The 8B/10B encoding gets you to 125MB/s, and an 0101 idle pattern effectively gives you 62.5MHz. Best regards, Dave Bob Patel wrote: Hi! I had a question regarding meeting EMI on my board for CISPR. I have a Fast Ethernet card and the 125MHz Fast Ehternet fails the CISPR in the 30Mhz to 100Mhz limit. In the layout care has been taken to isolate the chassis or quiet ground from Digital ground by isolating the ground from the secondary of the magnetics to the connector where the cable gets connected. Does anybody have recommendations as to how should I improve the board to meet CISPR in 30Mhz to 100Mhz. Thanks Bob
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