Time-Domain Reflectometry works by generating a signal and then sending that signal down the wireline and examining the reflected signal to ascertain wire faults. Noise-domain reflectometry does not introduce an external signal to test the wire, but examines the existing signals already on the wire to locate those faults.
Wikipedia has a number of good descriptions on TDR and variaions of TDR. See the links below.
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What is the difference between Florida and California What is the difference between Florida and California
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Difference between paging and what?
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The difference between a shogun and a samurai is like the difference between a king and a knight.
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Difference between it and what?
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Directly. Their difference IS the difference between them.