High Quality Content by WIKIPEDIA articles! Time-domain reflectometry or TDR is a measurement technique used to determine the characteristics of electrical lines by observing reflected waveforms. Time-domain transmissometry (TDT) is an analogous technique that measures the transmitted (rather than reflected) impulse. Together, they provide a powerful means of analysing electrical or optical transmission media such as coaxial cables and optical fibers. The term Coherent optical time domain reflectometry (COTDR) is also used in this regard.

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