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A few questions regarding measurement method, data, and HP sampling scope,
1. I assume the noise is sampled at the speed of 1GHz. According to a quick check of HP54720D (HP sampling scope you used), bandwidth is 2G with 8bit accuracy. Just want to confirm that the sampling speed.
2. Are the numbers along time axis (for example in page 11), from 1, 244, 3889 sampling points?
3. Common to differential. How good is the setup including the transformer in terms of common to differential? I assume you found 1000BASE-T operational errors when these noises pulses occur. Is that correct?
It is a very difficult measurement. In order to make accurate ones, I think we better measure mixed mode “S” parameters with careful calibrations so that we can calculate all those effects. However, there is a hope we can simplify and get a rough idea of PAM8 and 12 comparisons without exhausting measurements. Is there any possibility that you or anyone can measure the data once more and get us EXCEL format? That probably give us frequency shape (not necessary the absolute values) and enable us to proceed.
Although not very clear from PDF file but judging from the plots, the upper frequency (3dB point) of the noise energy seems ranging from 300 to 500MHz.
Keyeye Communications, Inc.
stds-802-3-10gbt@IEEE.ORG [mailto:stds-802-3-10gbt@IEEE.ORG] On Behalf Of Dove, Dan
I have dug and dug on my computer for the original data and can't find it. I was an unfortunate victim of a computer virus a few years ago that ate all of my MS application data, but I still have the PDF file of my presentation. I believe the original data was captured in EXCEL and is thus lost to an e-vandal.
I am attaching the PDF.