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Max The Magnificent
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re: Running around in ever-decreasing circles…
Max The Magnificent   6/24/2011 3:26:38 PM
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Oh, I see, you're suggesting building a simple one of these -- that would be cool -- I have a pile of un-punched cards in my office :-)

KarlS
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re: Running around in ever-decreasing circles…
KarlS   6/24/2011 2:59:54 PM
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Read the last line of the email, Magnificent One.

Max The Magnificent
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re: Running around in ever-decreasing circles…
Max The Magnificent   6/24/2011 1:56:42 PM
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Thanks for your reply -- but the actual question was whether there were any posters or educational games that could be used to explain this stuff to kids...

KarlS
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re: Running around in ever-decreasing circles…
KarlS   6/24/2011 1:54:11 PM
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"how punched cards were used" The first use was in tabulating the census of 1910, I think that was the year. They were invented by James(?) Hollerith. I am looking at a punched card right now. The card was divided into rows and columns. There were 80 columns and I think 12 rows, the top 3 rows were called zones and indicated how the remaining rows were encoded. Each column could be a letter(A - Z) or decimal number/(0 - 9). There are 26 letters so each zone punch along with one of the lower 9 was one of 9 letters -- 3 zones times one of 9 lower rows covered the 26 letters. I think this is accurate, no punch was zero and a punch in a lower row was 1 - 8. The cards were read by having a spring loaded contact that would fall through the hole so that whichever made contact that would be the meaning of the punched hole.



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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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