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fundamental frequency of NRZ signal

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senmeis

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Hi,

a 28 Gbps NRZ signal has the fundamental frequency of 14 GHz. Does it mean the digital data is evaluated at every rising and falling edge?
 

Rising and falling edge of which clock? If you imagine a 14 GHz clock, yes. The term "fundamental" refers to the spectral content of the data stream, not specifically a clock.
 

The clock at such speeds is almost certainly "recovered" from the data stream by local PLL and to make that reliable, a "transition density" is made a spec (like 8b/10b or Manchester) for data stream formatting.

28GBPS wants a 28Ghz clock.
 

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