[BP] proposed channel model change
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
|--------------------------------------------------------------------|