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Shannon, For my initial comment I was referring only to the Tyco cases.
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Shannon, Technically speaking only Cases 1,2,and 3 fail the 20dB spec at Nyquist.
You need to be careful in making a statement like going to a 20dB channel. As you pointed out many channels failed that number, but I believe those are all the 1m channels or stub limited channels that are failing it. The channels that are meeting that the number in general are the 0.75m. The potential ramifications could be that to meet the 20dB channel we consider changing our reach objective to 0.75m.
John
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Charles,
The difference (no pun intended) shows up in the differential vs single ended S-Parameters. I plotted SDD21 and S21 for modITTC23withCoupler.s4p, and there is 1.428dB difference at 5.160GHz. See attached.
Sorry I had to be at another meeting at noon, but I like the idea of going to a 20dB channel. In my opinion that’s the lever big enough to get a real system working. Unfortunately several (8 Molex, 4 Tyco, 3 Intel) channels violate that SDD21 up to 5GHz. See attached.
-Shannon
From: Charles Moore [mailto:charles.moore@avagotech.com]
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