[BP] proposed channel model change

[Charles Moore <charles_moore@xxxxxxxxxxx>]

guys,

   Rich Mellitz and i have been discussing changing the channel model,
to use a fit to Amax, as we are now doing for the interference tolerance
test channel (see moore_03_1105.pdf), instead of a fit to a straight line.

   This would have several advantages:

   1.  It would use a common method for both the test channel and the
       working channel
   2.  It would allow us to replace three graphical tests:
       i.   That the linear fit is better than Amax
       ii.  That the insertion loss is always better than Amax + something
       iii. That the ripple is better than something
       with one numeric test, that mc < 1.0, and the graphical ripple
       test.  We may need an additional limit on bc.
    3. Since the fit to Amax will be substantially better than the fit
       to a straight line, the ripple will be smaller and more meaningful.
       This will reduce the number of false fails.  We should be able
       to shrink the ripple bounds (Rich:  will you figure out by how
       much?) which may also  reduce false passes.
    4. Since the fit will be especially improved at low frequency, we
       will be able to reduce f1, especially for 10GBASE-KR, which
       actually uses low frequencies more than either 1000BASE-KX or
       10GBASE-KX4.

    Does anyone see any problems with this proposal?

                     charles

-- 
|--------------------------------------------------------------------|
|       Charles Moore 
|       Agilent Technologies
|       ASIC Products Division
|       charles_moore@agilent.com
|       (970) 288-4561
|--------------------------------------------------------------------|