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Which of the following options are true about OTDRs? (Choose two )
They can be used to test any kind of network cable: coaxial, telephony or fiber-optic.
It conducts physical cable testing by injecting a series of optical pulses.
They can only be used to test fiber-optic cables.
It can be used to test the functionality of electricity outlets.
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber. The scattered or reflected light that is gathered back is used to characterize the optical fiber. https://en.wikipedia.org/wiki/Opticaltime-domainreflectometer
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