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Diff Pair Impedance discontinuity qn - which is worse - one or two?

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mav1234

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I have a 1G ethernet link which goes through three boards (Board1, Board2, and Board3).

Board1 has to have diff impedance of 100ohm, Board 3 has to have diff impedance of 85 Ohm. (existing boards)

Question: Is it better for Board2 to have 85 Ohm diff impedance??? or something in the middle like 92.5Ohm???
 

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