NCTI Fiber Testing & Maintenance Exam
Questions and answers 2025
What .type .of .interface .is .common .on .new-generation .optical .meters? .- .ANS✓✓
-USB
Optical .power .meters .used .for .testing .FTTx .installations .operating .downstream
.from .the .headend .should .be .calibrated .for .which
wavelengths? .- .ANS✓✓-1490, .1550, .and .1577
Besides .a .stabilized .light .source, .an .enhanced .optical .power .meter, .and .an
.optical .talk .set, .what .else .do .optical .loss .test .sets .include .in .their .combined
.features? .- .ANS✓✓-An .ORL .meter
What .do .most .optical .power .meters .require .when .measuring .transmit .and
.receive .power? .- .ANS✓✓-Annual .calibration .that .is .traceable .to .the .NIST
What .must .be .done .first .when .measuring .end-to-end .attenuation .using .the
.optical .power .meter? .- .ANS✓✓-The .light .source .and .optical .power .meter .must
.be .referenced .together .before .taking .measurements
What .do .most .models .of .laser .light .sources .use .as .operational .status
.indicators? .- .ANS✓✓-Controls .for .turning .the .light .source .on .and .off,
.selecting .the .laser .wavelength .for .testing, .and .selecting .the .modulation
.signals; .display .indicators .for .the .selected .wavelength, .mode .of .operation,
.battery .status, .and .power .source.
What .occurs .when .a .laser .light .source .is .used .with .an .optical .fiber .identifier .to
.test .fibers? .- .ANS✓✓-A .2-kHz .modulation .provides .a .test .signal .allowing .the
.fiber .under .test .to .be .detected .by .the .optical .fiber .identifier.
Besides .determining .whether .the .light .is .on .fiber .and .the .light .is .modulated
.and .carrying .traffic, .what .does .is .the .third .function .the .optical .fiber .identifiers
.determine? .- .ANS✓✓-The .direction .from .which .the .light .is .coming.
Which .of .the .following .statements .is .accurate .regarding .laser .light .source
.specifications? .- .ANS✓✓-Standard .environmental .specifications .for .laser .light
.sources .range .from .13°F .to .130°F .for .operating .temperatures .and .- .19°F .to
.158°F .for .storage .temperatures.
, What .visually .represents .the .optical .fiber's .attenuation .characteristics .and .the
.OTDR .setup? .- .ANS✓✓-The .waveform
What .are .the .most .common .single-mode .wavelengths .used .by .OTDR? .- .ANS✓
✓-1310 .and .1550
Which .class .of .optical .transmitters .is .the .safest .for .the .human .eye? .- .ANS✓✓-
Class .1
What .is .unique .to .a .fiber .break .locator? .- .ANS✓✓-It .is .the .least .expensive .type
.of .OTDR.
Which .of .the .following .is .an .additional .option .for .a .full-feature .OTDR: .- .ANS✓
✓-DWDM
Which .of .the .following .is .true .regarding .reflections .in .an .optical .fiber? .- .ANS✓
✓-Microscopic .density .fluctuations, .impurities, .and .structural .imperfections .in
.the .fiber .cause .Rayleigh .scattering.
What .is .an .RTU .characteristic? .- .ANS✓✓-It .monitors .optical .fiber .from .the
.headend .or .other .key .points .in .a .network.
What .do .OTDR .displays .and .controls .encompass? .- .ANS✓✓-Task .options,
.which .include .range, .pulse .width, .wavelength, .measuring .mode, .backscatter
.coefficient, .and .index .of .refraction.
What .happens .if .the .OTDR .pulse .width .is .set .too .long? .- .ANS✓✓-Events .can
.be .missed .or .combined
The .refractive .index .is .calculated .by .what .formula? .- .ANS✓✓-Divide .the .speed
.of .light .in .a .vacuum .by .the .speed .of .light .through .an .optical .fiber.
What .is .ORL? .- .ANS✓✓-The .sum .of .all .Fresnel .reflections .and .the .fiber's
.Rayleigh .backscatter
Which .wavelength .is .the .most .sensitive .to .macrobends .and .microbends .and
.has .been .specified .by .standards .groups .for .testing .and .monitoring .fiber-optic
.spans? .- .ANS✓✓-The .1625-nm .wavelength .is .the .most .sensitive .for .microbend
.and .macrobend .detection.
Which .type .of .fiber-optic .cable .has .a .connector .on .both .ends? .- .ANS✓✓-
Jumper
Which .of .the .following .is .true .when .programming .an .OTDR? .- .ANS✓✓-
Configuration .settings .include .refraction .index, .pulse .width, .range, .wavelength,
.dead .zone, .event .dead .zone, .masking, .noise .floor, .and .loss .variables.
Questions and answers 2025
What .type .of .interface .is .common .on .new-generation .optical .meters? .- .ANS✓✓
-USB
Optical .power .meters .used .for .testing .FTTx .installations .operating .downstream
.from .the .headend .should .be .calibrated .for .which
wavelengths? .- .ANS✓✓-1490, .1550, .and .1577
Besides .a .stabilized .light .source, .an .enhanced .optical .power .meter, .and .an
.optical .talk .set, .what .else .do .optical .loss .test .sets .include .in .their .combined
.features? .- .ANS✓✓-An .ORL .meter
What .do .most .optical .power .meters .require .when .measuring .transmit .and
.receive .power? .- .ANS✓✓-Annual .calibration .that .is .traceable .to .the .NIST
What .must .be .done .first .when .measuring .end-to-end .attenuation .using .the
.optical .power .meter? .- .ANS✓✓-The .light .source .and .optical .power .meter .must
.be .referenced .together .before .taking .measurements
What .do .most .models .of .laser .light .sources .use .as .operational .status
.indicators? .- .ANS✓✓-Controls .for .turning .the .light .source .on .and .off,
.selecting .the .laser .wavelength .for .testing, .and .selecting .the .modulation
.signals; .display .indicators .for .the .selected .wavelength, .mode .of .operation,
.battery .status, .and .power .source.
What .occurs .when .a .laser .light .source .is .used .with .an .optical .fiber .identifier .to
.test .fibers? .- .ANS✓✓-A .2-kHz .modulation .provides .a .test .signal .allowing .the
.fiber .under .test .to .be .detected .by .the .optical .fiber .identifier.
Besides .determining .whether .the .light .is .on .fiber .and .the .light .is .modulated
.and .carrying .traffic, .what .does .is .the .third .function .the .optical .fiber .identifiers
.determine? .- .ANS✓✓-The .direction .from .which .the .light .is .coming.
Which .of .the .following .statements .is .accurate .regarding .laser .light .source
.specifications? .- .ANS✓✓-Standard .environmental .specifications .for .laser .light
.sources .range .from .13°F .to .130°F .for .operating .temperatures .and .- .19°F .to
.158°F .for .storage .temperatures.
, What .visually .represents .the .optical .fiber's .attenuation .characteristics .and .the
.OTDR .setup? .- .ANS✓✓-The .waveform
What .are .the .most .common .single-mode .wavelengths .used .by .OTDR? .- .ANS✓
✓-1310 .and .1550
Which .class .of .optical .transmitters .is .the .safest .for .the .human .eye? .- .ANS✓✓-
Class .1
What .is .unique .to .a .fiber .break .locator? .- .ANS✓✓-It .is .the .least .expensive .type
.of .OTDR.
Which .of .the .following .is .an .additional .option .for .a .full-feature .OTDR: .- .ANS✓
✓-DWDM
Which .of .the .following .is .true .regarding .reflections .in .an .optical .fiber? .- .ANS✓
✓-Microscopic .density .fluctuations, .impurities, .and .structural .imperfections .in
.the .fiber .cause .Rayleigh .scattering.
What .is .an .RTU .characteristic? .- .ANS✓✓-It .monitors .optical .fiber .from .the
.headend .or .other .key .points .in .a .network.
What .do .OTDR .displays .and .controls .encompass? .- .ANS✓✓-Task .options,
.which .include .range, .pulse .width, .wavelength, .measuring .mode, .backscatter
.coefficient, .and .index .of .refraction.
What .happens .if .the .OTDR .pulse .width .is .set .too .long? .- .ANS✓✓-Events .can
.be .missed .or .combined
The .refractive .index .is .calculated .by .what .formula? .- .ANS✓✓-Divide .the .speed
.of .light .in .a .vacuum .by .the .speed .of .light .through .an .optical .fiber.
What .is .ORL? .- .ANS✓✓-The .sum .of .all .Fresnel .reflections .and .the .fiber's
.Rayleigh .backscatter
Which .wavelength .is .the .most .sensitive .to .macrobends .and .microbends .and
.has .been .specified .by .standards .groups .for .testing .and .monitoring .fiber-optic
.spans? .- .ANS✓✓-The .1625-nm .wavelength .is .the .most .sensitive .for .microbend
.and .macrobend .detection.
Which .type .of .fiber-optic .cable .has .a .connector .on .both .ends? .- .ANS✓✓-
Jumper
Which .of .the .following .is .true .when .programming .an .OTDR? .- .ANS✓✓-
Configuration .settings .include .refraction .index, .pulse .width, .range, .wavelength,
.dead .zone, .event .dead .zone, .masking, .noise .floor, .and .loss .variables.
