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posted in October 1997
Modulation Schemes: Moving Digital Data With Analog Signals
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10/4/1997   Post a comment
If modulation makes you sick, don't read Andrew Davis' overview of modulation schemes, and how to stuff a fire hose worth of data down a soda straw pipe. Modulations are in the news these days because they are the subject of many skirmishes in the broadband wars. Both the cable modem vendors and the xDSL vendors are duking it out over modulations and standards. Read why.


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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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