Maintaining Optical Networks Exam Spring 2023 with
complete solution
What topology do most fiber-to-the-user (FTTx) networks use, which requires
greater fiber color code management in its documentation?
Point to multipoint (P2MP).
Improper use of nylon tie wraps can induce this problem
Microbends
What are potential sources of problems in aerial installations?
Falling branches, pole attachment problems, and improper sag and loading
considerations.
During installation of fiber-optic cable, what does damage to the cable jacket
cause?
Moisture migration into the cable.
In a fiber-optic network,
The role of maintenance is to proactively maintain network tolerances and recognize,
locate, and remedy potential problems.
A fiber-optic network maintenance plan should be developed with which of the
following in mind?
The task of compiling the physical document must become the responsibility of an
identifiable position or organization.
What is the best way to prevent problems in outside fiber-optic splice
enclosures?
The outer jacket and the internal cable structures must be secured individually to protect
the closure and splice trays from the effects of expansion and contraction.
The troubleshooting process
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.
When testing the fiber-optic plant,
An optical power meter is used to measure the strength of light signals anywhere in a
fiber system where a connection can be made.
As changes are introduced to a fiber-optic network,
Documentation must be updated to reflect the new configuration and performance data.
Besides RS-232 ports, what type of interface is common on an optical power
meter?
A USB interface can provide easy download of information to a PC.
Optical power meters used for testing fiber-to-the-user (FTTx) installations
operating downstream from the headend should be calibrated for which
wavelengths?
490 nm, 1,550 nm, and 1,577 nm.
A wavelength-isolating power meter is most commonly used in
Point-to-multipoint FTTx installations.
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?
, A stabilized light source, an optical return loss meter, an enhanced optical power meter,
and an optical talk set.
Regarding various optical power meter types,
Enhanced power meters evolved for roles where measurements need to be easily
stored, recalled, transmitted, and downloaded.
When measuring transmit and receive power with an optical power meter,
The meter's calibration must be traceable to the National Institute of Standards
Technology (NIST).
When measuring end-to-end attenuation,
The light source and optical power meter must be referenced together prior to making
any field measurement.
A light source
Is crucial for accurately measuring optical fiber power and attenuation.
When a laser light source is used to test fibers,
A 2 kHz modulation provides a test signal that allows the fiber under test to be detected
by an optical fiber identifier.
Optical fiber identifiers
Detect live traffic signals or modulated test signals on an individual optical fiber.
Which of the following describe optical time domain reflectometer (OTDR)
nonreflective signatures?
Fusion splices, macrobends, and microbends.
The most common single-mode wavelengths used by OTDRs are:
1,310 nm and 1,550 nm.
Which class of optical transmitter is the safest to the human eye?
Class 1
What is unique to a fiber break locator?
It is the least expensive type of OTDR.
Full-feature OTDRs, also known as platform OTDRs, have these as options:
Chromatic dispersion and polarization mode dispersion (PMD) module interfaces.
Regarding reflections in an optical fiber,
Rayleigh scattering is caused by compositional fluctuations or core imperfections in the
fiber.
What is true of mainframe optical time domain reflectometers (OTDR)?
They are used mainly in the fiber manufacturing industry.
What do OTDR displays and controls encompass?
Task options, which include range, pulse width, wavelength, measuring mode,
backscatter coefficient, and index of refraction.
What is the probable cause if an OTDR trace shows one optical splice but it is a
known fact that there are two?
The pulse width is set too long.
Index of refraction (IOR) is calculated by what formula?
Divide the speed of light in a vacuum by the speed of light through an optical fiber.
Optical return loss (ORL) is used to define the amount of reflection from
The sum of all Fresnel reflections and the fiber's Rayleigh backscatter.
complete solution
What topology do most fiber-to-the-user (FTTx) networks use, which requires
greater fiber color code management in its documentation?
Point to multipoint (P2MP).
Improper use of nylon tie wraps can induce this problem
Microbends
What are potential sources of problems in aerial installations?
Falling branches, pole attachment problems, and improper sag and loading
considerations.
During installation of fiber-optic cable, what does damage to the cable jacket
cause?
Moisture migration into the cable.
In a fiber-optic network,
The role of maintenance is to proactively maintain network tolerances and recognize,
locate, and remedy potential problems.
A fiber-optic network maintenance plan should be developed with which of the
following in mind?
The task of compiling the physical document must become the responsibility of an
identifiable position or organization.
What is the best way to prevent problems in outside fiber-optic splice
enclosures?
The outer jacket and the internal cable structures must be secured individually to protect
the closure and splice trays from the effects of expansion and contraction.
The troubleshooting process
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.
When testing the fiber-optic plant,
An optical power meter is used to measure the strength of light signals anywhere in a
fiber system where a connection can be made.
As changes are introduced to a fiber-optic network,
Documentation must be updated to reflect the new configuration and performance data.
Besides RS-232 ports, what type of interface is common on an optical power
meter?
A USB interface can provide easy download of information to a PC.
Optical power meters used for testing fiber-to-the-user (FTTx) installations
operating downstream from the headend should be calibrated for which
wavelengths?
490 nm, 1,550 nm, and 1,577 nm.
A wavelength-isolating power meter is most commonly used in
Point-to-multipoint FTTx installations.
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?
, A stabilized light source, an optical return loss meter, an enhanced optical power meter,
and an optical talk set.
Regarding various optical power meter types,
Enhanced power meters evolved for roles where measurements need to be easily
stored, recalled, transmitted, and downloaded.
When measuring transmit and receive power with an optical power meter,
The meter's calibration must be traceable to the National Institute of Standards
Technology (NIST).
When measuring end-to-end attenuation,
The light source and optical power meter must be referenced together prior to making
any field measurement.
A light source
Is crucial for accurately measuring optical fiber power and attenuation.
When a laser light source is used to test fibers,
A 2 kHz modulation provides a test signal that allows the fiber under test to be detected
by an optical fiber identifier.
Optical fiber identifiers
Detect live traffic signals or modulated test signals on an individual optical fiber.
Which of the following describe optical time domain reflectometer (OTDR)
nonreflective signatures?
Fusion splices, macrobends, and microbends.
The most common single-mode wavelengths used by OTDRs are:
1,310 nm and 1,550 nm.
Which class of optical transmitter is the safest to the human eye?
Class 1
What is unique to a fiber break locator?
It is the least expensive type of OTDR.
Full-feature OTDRs, also known as platform OTDRs, have these as options:
Chromatic dispersion and polarization mode dispersion (PMD) module interfaces.
Regarding reflections in an optical fiber,
Rayleigh scattering is caused by compositional fluctuations or core imperfections in the
fiber.
What is true of mainframe optical time domain reflectometers (OTDR)?
They are used mainly in the fiber manufacturing industry.
What do OTDR displays and controls encompass?
Task options, which include range, pulse width, wavelength, measuring mode,
backscatter coefficient, and index of refraction.
What is the probable cause if an OTDR trace shows one optical splice but it is a
known fact that there are two?
The pulse width is set too long.
Index of refraction (IOR) is calculated by what formula?
Divide the speed of light in a vacuum by the speed of light through an optical fiber.
Optical return loss (ORL) is used to define the amount of reflection from
The sum of all Fresnel reflections and the fiber's Rayleigh backscatter.
