NCTI Fiber Testing & Maintenance Questions and answers

NCTI Fiber Testing & Maintenance
Questions and answers.



What type of interface is common on new-generation optical meters? - (correct answer) - USB
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Optical power meters used for testing FTTx installations operating downstream from the headend shou
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ld be calibrated for which
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wavelengths? - (correct answer) - 1490, 1550, and 1577 hg hg hg hg hghg hg hg hg




Besides a stabilized light source, an enhanced optical power meter, and an optical talk set, what else d
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o optical loss test sets include in their combined features? - (correct answer) - An ORL meter
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What do most optical power meters require when measuring transmit and receive power? -
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(correct answer) - Annual calibration that is traceable to the NIST
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What must be done first when measuring end-to-end attenuation using the optical power meter? -
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(correct answer) -
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The light source and optical power meter must be referenced together before taking measurements
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What do most models of laser light sources use as operational status indicators? - (correct answer) -
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Controls for turning the light source on and off, selecting the laser wavelength for testing, and selecti
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ng the modulation signals; display indicators for the selected wavelength, mode of operation, battery s
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What occurs when a laser light source is used with an optical fiber identifier to test fibers? -
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(correct answer) - A 2-
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kHz modulation provides a test signal allowing the fiber under test to be detected by the optical fiber i
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dentifier.

Besides determining whether the light is on fiber and the light is modulated and carrying traffic, what
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does is the third function the optical fiber identifiers determine? - (correct answer) -
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The direction from which the light is coming.
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, Which of the following statements is accurate regarding laser light source specifications? -
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(correct answer) -
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Standard environmental specifications for laser light sources range from 13°F to 130°F for operating t
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emperatures and - 19°F to 158°F for storage temperatures. hg hg hg hg hg hg hg hg




What visually represents the optical fiber's attenuation characteristics and the OTDR setup? -
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(correct answer) - The waveform
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What are the most common single-mode wavelengths used by OTDR? - (correct answer) -
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1310 and 1550
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Which class of optical transmitters is the safest for the human eye? - (correct answer) - Class 1
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What is unique to a fiber break locator? - (correct answer) - It is the least expensive type of OTDR.
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Which of the following is an additional option for a full-feature OTDR: - (correct answer) - DWDM
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Which of the following is true regarding reflections in an optical fiber? - (correct answer) -
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Microscopic density fluctuations, impurities, and structural imperfections in the fiber cause Rayleigh s
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cattering.

What is an RTU characteristic? - (correct answer) -
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It monitors optical fiber from the headend or other key points in a network.
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What do OTDR displays and controls encompass? - (correct answer) -
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Task options, which include range, pulse width, wavelength, measuring mode, backscatter coefficient,
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and index of refraction.
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What happens if the OTDR pulse width is set too long? - (correct answer) -
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Events can be missed or combined
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The refractive index is calculated by what formula? - (correct answer) -
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Divide the speed of light in a vacuum by the speed of light through an optical fiber.
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What is ORL? - (correct answer) -
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The sum of all Fresnel reflections and the fiber's Rayleigh backscatter
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Which wavelength is the most sensitive to macrobends and microbends and has been specified by stan
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dards groups for testing and monitoring fiber-optic spans? - (correct answer) - The 1625-
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nm wavelength is the most sensitive for microbend and macrobend detection.
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Which type of fiber-optic cable has a connector on both ends? - (correct answer) - Jumper
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Which of the following is true when programming an OTDR? - (correct answer) -
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Configuration settings include refraction index, pulse width, range, wavelength, dead zone, event dea
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d zone, masking, noise floor, and loss variables.
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