Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym OTDR is...

OTDR is

Optical Time Domain Reflectometry
A Optical Time Delay Response
Optical Time Domain Reflectometers

More Meanings For OTDR:

Optical Time Domain Reflectometer
Optical Time Domain Reflectometry
A Optical Time Delay Response
Optical Time Domain Reflectometers

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