OTDR stands for
∙ a. Optical Time Domain Reflectometer
∙ b. Optical Transmit Direction Return
∙ c. Optical Time Domain Time Regeneration
∙ d. Overtime Direct Reference
∙ a. Optical Time Domain Reflectometer
∙ b. Optical Transmit Direction Return
∙ c. Optical Time Domain Time Regeneration
∙ d. Overtime Direct Reference