I use Protel's  SI tools for controlled impedance calculations.   My results
have been within +/- 5 %  of any of the same  analysis we have performed by
TYCO,  KCA, or other board houses using top of the line Polar Instruments
tools.    I have a great degree of confidence with the tools, you just have
to set it up and walk away from it for a few hours.   Thats the  only
drawback .  We have finally obtained some actual measured data for crosstalk
on our  backplanes which I am attempting to verify against Protels crosstalk
tools.  It is taking a while to verify due to my lack of time for this side
project.


Mike Reagan
EDSI

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