Fiber Testing and Maintenance
Exam 2025/2026 COMPLETE QUESTIONS
WITH VERIFIED CORRECT SOLUTIONS ||
100% GUARANTEED PASS
<LATEST VERSION>
1. The troubleshooting process - ANSWER ✓ Should include steps that
identify, analyze, and locate the problem as well as diagnose its source,
repair the problem, and test to ensure the problem is resolved.
2. When testing the fiber-optic plant, - ANSWER ✓ An optical power meter is
used to measure the strength of light signals anywhere in a fiber system
where a connection can be made.
3. As changes are introduced to a fiber-optic network, - ANSWER ✓
Documentation must be updated to reflect the new configuration and
performance data.
4. Besides RS-232 ports, what type of interface is common on an optical power
meter? - ANSWER ✓ A USB interface can provide easy download of
information to a PC
5. Optical power meters used for testing fiber-to-the-user (FTTx) installations
operating downstream from the headend should be calibrated for which
wavelengths? - ANSWER ✓ 1,490 nm, 1,550 nm, and 1,577nm
6. A wavelength-isolating power meter is most commonly used in - ANSWER
✓ Point-to-multipoint FTTx installations
,7. Optical loss test sets perform multiple functions because they include the
features of multiple pieces of test sets. The features of which other test sets
are combined into an optical loss test set? - ANSWER ✓ A stabilized light
source, an optical return loss meter, an enhanced optical power meter, and an
optical talk set.
8. When using mechanical splices and other connection techniques on bare
optical fibers, - ANSWER ✓ In some cases, the bare optical fiber can be
indirectly connected to the optical time domain reflectometer (OTDR) using
a system jumper, interconnection sleeve, and a bare fiber adapter.
9. When programming an optical time domain reflectometer (OTDR) -
ANSWER ✓ Configuration settings include index of refraction (IOR), pulse
width, range, wavelength, dead zone, event dead zone, masking, noise floor,
and loss variables.
10.Which of the following is true regarding maintenance of the optical
network? choose all that apply. - ANSWER ✓ ITU-T designation
encompasses all things voice, data, and video.
FTTx networks incorporate a point-to-multipoint (P2MP) optical topology
that requires greater fiber color code management.
11.What is the purpose of good maintenance practices? - ANSWER ✓ Good
maintenance practices minimize failures that might have otherwise occurred
with ongoing neglect and identify potential performance issues before they
become problems.
12.What is an RTU characteristic? - ANSWER ✓ It monitors optical fiber from
the headend or other key points in a network.
13.What do OTDR displays and controls encompass? - ANSWER ✓ Task
options, which include range, pulse width, wavelength, measuring mode,
backscatter coefficient, and index of refraction.
14.What happens if the OTDR pulse width is set too long? - ANSWER ✓
Events can be missed or combined
,15.The refractive index is calculated by what formula? - ANSWER ✓ Divide
the speed of light in a vacuum by the speed of light through an optical fiber.
16.What is ORL? - ANSWER ✓ The sum of all Fresnel reflections and the
fiber's Rayleigh backscatter
17.Which wavelength is the most sensitive to macrobends and microbends and
has been specified by standards groups for testing and monitoring fiber-optic
spans? - ANSWER ✓ The 1625-nm wavelength is the most sensitive for
microbend and macrobend detection.
18.regarding various optical power meter types, - ANSWER ✓ Enhanced
power meters evolved for roles where measurements need to be easily
stored, recalled, transmitted, and downloaded.
19.When measuring transmit and receive power with an optical power meter, -
ANSWER ✓ The meter's calibration must be traceable to the National
Institute of Standards Technology.
20.When measuring end-to-end attenuation, - ANSWER ✓ The light source and
optical power meter must be referenced together prior to making any field
measurement.
21.A light source - ANSWER ✓ Is crucial for accurately measuring optical
fiber power and attenuation.
22.When a laser light source is used to test fibers, - ANSWER ✓ A 2 kHz
modulation provides a test signal that allows the fiber under test to be
detected by an optical fiber identifier.
23.Optical fiber indentifiers - ANSWER ✓ Detect live traffic signals or
modulated test signals on an individual optical fiber.
24.Which of the following describe optical time domain reflectometer (OTDR)
nonreflective signatures? - ANSWER ✓ Fusion splices, macrobends, and
microbends.
, 25.The most common single-mode wavelengths used by OTDRs are -
ANSWER ✓ 1,310 nm and 1,550 nm
26.Which class of optical tranmitter is the safest to the human eye? - ANSWER
✓ Class 1
27.What is unique to a fiber break locator? - ANSWER ✓ It is the least
expensive type of OTDR.
28.Full-feature OTDRs, also known as platform OTDRs, have these as options:
- ANSWER ✓ Chromatic dispersion and polarization mode dispersion
(PMD) module interfaces.
29.Regarding reflections in an optical fiber, - ANSWER ✓ Rayleigh scattering
is caused by compositional fluctuations or core imperfections in the fiber.
30.What is true of mainframe optical time domain reflectometers (OTDR) -
ANSWER ✓ They are used mainly in the fiber manufacturing industry.
31.What do OTDR displays and controls encompass? - ANSWER ✓ Task
options, which include range, pulse width, wavelength, measuring mode,
backscatter coefficient, and index of refraction.
32.What is the probable if an OTDR trace shows one optical splice but it is a
known fact that there are two? - ANSWER ✓ The pulse width is set too
long.
33.index of refraction (IOR) is calculated by what formula? - ANSWER ✓
Divide the speed of light in a vacuum by the speed of light through an
optical fiber.
34.Optical return loss (ORL) is used to define the amount of reflection from -
ANSWER ✓ The sum of all Fresnel reflections and the fiber's Rayleigh
backscatter.
35.Which wavelength is the most sensitive to macrobends and microbends and
has been specified by standards groups for testing and monitoring of fiber-
Exam 2025/2026 COMPLETE QUESTIONS
WITH VERIFIED CORRECT SOLUTIONS ||
100% GUARANTEED PASS
<LATEST VERSION>
1. The troubleshooting process - ANSWER ✓ Should include steps that
identify, analyze, and locate the problem as well as diagnose its source,
repair the problem, and test to ensure the problem is resolved.
2. When testing the fiber-optic plant, - ANSWER ✓ An optical power meter is
used to measure the strength of light signals anywhere in a fiber system
where a connection can be made.
3. As changes are introduced to a fiber-optic network, - ANSWER ✓
Documentation must be updated to reflect the new configuration and
performance data.
4. Besides RS-232 ports, what type of interface is common on an optical power
meter? - ANSWER ✓ A USB interface can provide easy download of
information to a PC
5. Optical power meters used for testing fiber-to-the-user (FTTx) installations
operating downstream from the headend should be calibrated for which
wavelengths? - ANSWER ✓ 1,490 nm, 1,550 nm, and 1,577nm
6. A wavelength-isolating power meter is most commonly used in - ANSWER
✓ Point-to-multipoint FTTx installations
,7. Optical loss test sets perform multiple functions because they include the
features of multiple pieces of test sets. The features of which other test sets
are combined into an optical loss test set? - ANSWER ✓ A stabilized light
source, an optical return loss meter, an enhanced optical power meter, and an
optical talk set.
8. When using mechanical splices and other connection techniques on bare
optical fibers, - ANSWER ✓ In some cases, the bare optical fiber can be
indirectly connected to the optical time domain reflectometer (OTDR) using
a system jumper, interconnection sleeve, and a bare fiber adapter.
9. When programming an optical time domain reflectometer (OTDR) -
ANSWER ✓ Configuration settings include index of refraction (IOR), pulse
width, range, wavelength, dead zone, event dead zone, masking, noise floor,
and loss variables.
10.Which of the following is true regarding maintenance of the optical
network? choose all that apply. - ANSWER ✓ ITU-T designation
encompasses all things voice, data, and video.
FTTx networks incorporate a point-to-multipoint (P2MP) optical topology
that requires greater fiber color code management.
11.What is the purpose of good maintenance practices? - ANSWER ✓ Good
maintenance practices minimize failures that might have otherwise occurred
with ongoing neglect and identify potential performance issues before they
become problems.
12.What is an RTU characteristic? - ANSWER ✓ It monitors optical fiber from
the headend or other key points in a network.
13.What do OTDR displays and controls encompass? - ANSWER ✓ Task
options, which include range, pulse width, wavelength, measuring mode,
backscatter coefficient, and index of refraction.
14.What happens if the OTDR pulse width is set too long? - ANSWER ✓
Events can be missed or combined
,15.The refractive index is calculated by what formula? - ANSWER ✓ Divide
the speed of light in a vacuum by the speed of light through an optical fiber.
16.What is ORL? - ANSWER ✓ The sum of all Fresnel reflections and the
fiber's Rayleigh backscatter
17.Which wavelength is the most sensitive to macrobends and microbends and
has been specified by standards groups for testing and monitoring fiber-optic
spans? - ANSWER ✓ The 1625-nm wavelength is the most sensitive for
microbend and macrobend detection.
18.regarding various optical power meter types, - ANSWER ✓ Enhanced
power meters evolved for roles where measurements need to be easily
stored, recalled, transmitted, and downloaded.
19.When measuring transmit and receive power with an optical power meter, -
ANSWER ✓ The meter's calibration must be traceable to the National
Institute of Standards Technology.
20.When measuring end-to-end attenuation, - ANSWER ✓ The light source and
optical power meter must be referenced together prior to making any field
measurement.
21.A light source - ANSWER ✓ Is crucial for accurately measuring optical
fiber power and attenuation.
22.When a laser light source is used to test fibers, - ANSWER ✓ A 2 kHz
modulation provides a test signal that allows the fiber under test to be
detected by an optical fiber identifier.
23.Optical fiber indentifiers - ANSWER ✓ Detect live traffic signals or
modulated test signals on an individual optical fiber.
24.Which of the following describe optical time domain reflectometer (OTDR)
nonreflective signatures? - ANSWER ✓ Fusion splices, macrobends, and
microbends.
, 25.The most common single-mode wavelengths used by OTDRs are -
ANSWER ✓ 1,310 nm and 1,550 nm
26.Which class of optical tranmitter is the safest to the human eye? - ANSWER
✓ Class 1
27.What is unique to a fiber break locator? - ANSWER ✓ It is the least
expensive type of OTDR.
28.Full-feature OTDRs, also known as platform OTDRs, have these as options:
- ANSWER ✓ Chromatic dispersion and polarization mode dispersion
(PMD) module interfaces.
29.Regarding reflections in an optical fiber, - ANSWER ✓ Rayleigh scattering
is caused by compositional fluctuations or core imperfections in the fiber.
30.What is true of mainframe optical time domain reflectometers (OTDR) -
ANSWER ✓ They are used mainly in the fiber manufacturing industry.
31.What do OTDR displays and controls encompass? - ANSWER ✓ Task
options, which include range, pulse width, wavelength, measuring mode,
backscatter coefficient, and index of refraction.
32.What is the probable if an OTDR trace shows one optical splice but it is a
known fact that there are two? - ANSWER ✓ The pulse width is set too
long.
33.index of refraction (IOR) is calculated by what formula? - ANSWER ✓
Divide the speed of light in a vacuum by the speed of light through an
optical fiber.
34.Optical return loss (ORL) is used to define the amount of reflection from -
ANSWER ✓ The sum of all Fresnel reflections and the fiber's Rayleigh
backscatter.
35.Which wavelength is the most sensitive to macrobends and microbends and
has been specified by standards groups for testing and monitoring of fiber-
