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PHILLIP.MCGEE
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PHILLIP.MCGEE   9/4/2013 10:35:17 AM
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I figured I'd post something on this since, there hasn't been a response yet.

Based upon the fact that the patent number is in English, I took the chance that it was probaby originally from an English speaking country.  The British patent for number 4615 is dated 1821 and references a method to destroying smoke in a chimney.  The US patent is dated 1826 and is labeled as a machine for making hubs for wheels for carriages.  I would speculate that it is the latter as opposed to the former, assuming that either one has any relation to the item shown.  The timeframes for both patents would be consitent with the manufacturing appearance and apparent age of the device. 

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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