NCTI Exam Fiber III UPDATED ACTUAL
Exam Questions and CORRECT Answers
The National Electrical Safety Code (NESC) provides guidelines concerning which portion of
the fiber-optic cable network? - CORRECT ANSWER - (NOT) Safety and health standards
that apply to the work conditions, practices, and installations performed at telecommunications
field installations.
What is a safety concern when aerial fiber-optic cable is installed between poles, even though
there are no high-voltage power lines? - CORRECT ANSWER - The buildup of lethal
amounts of static electricity on the fiber-optic cable that can discharge through a person on a
ladder or some other conductor connected to ground.
What is used in outside plant fiber-optic cable to protect and isolate the optical fibers from
stress? - CORRECT ANSWER - Strength members and buffer tubes.
What is the purpose of grounding to earth? - CORRECT ANSWER - To protect against the
adverse effects of lightning and reduction of static.
What is the minimum amount of slack that must be provided for splicing fiber-optic cable in
underground installations? - CORRECT ANSWER - 15 meters on both the inbound and
outbound span.
What information is documented at fiber-optic slack and splice locations? - CORRECT
ANSWER - Incoming and outgoing sequential markings showing the cable's physical length.
What can be attached to the pulling line to prevent the fiber-optic cable from twisting during
installation? - CORRECT ANSWER - A break-away swivel.
What are two critical factors for a successful installation of fiber-optic cable? - CORRECT
ANSWER - Cable pulling tension and cable bend radius.
, What should be done to prevent the buildup of lethal amounts of static electricity on long lengths
of aerial fiber-optic cable? - CORRECT ANSWER - Install grounding clamps, which connect
the cable exterior and metallic messengers to a good solid ground at each pole site.
When working on a ladder, which rungs are forbidden for standing? - CORRECT ANSWER -
The top two rungs of any ladder.
Which component of an optical modulation system contains an optical detector and a
demodulator? - CORRECT ANSWER - Optical receiver.
What is digital modulation? - CORRECT ANSWER - It is the interruption of light waves in a
coded sequence.
Select the answer that best completes this sentence: In analog modulation, the _____ of the light
wave changes in _____ proportion to the _____ analog signal. - CORRECT ANSWER -
Intensity; direct; incoming.
Which type of optical detection involves a photodiode that converts the light waves to an
electrical signal that varies in proportion to intensity changes in the light waves? - CORRECT
ANSWER - Direct.
Which layer of a synchronous optical network (SONET) maps the signals into a synchronous
payload envelope (SPE)? - CORRECT ANSWER - Path.
The frame structure of a synchronous transport signal (STS) is divided into two parts. What are
they? - CORRECT ANSWER - Transport overhead - contains section + line layers
Synchronous payload envelope - contains path overhead + payload data
What occurs in the wavelength division multiplexing (WDM) process? - CORRECT
ANSWER - The optical output from multiple lasers operating at different wavelengths is
combined and transported over a single, common optical fiber.
Exam Questions and CORRECT Answers
The National Electrical Safety Code (NESC) provides guidelines concerning which portion of
the fiber-optic cable network? - CORRECT ANSWER - (NOT) Safety and health standards
that apply to the work conditions, practices, and installations performed at telecommunications
field installations.
What is a safety concern when aerial fiber-optic cable is installed between poles, even though
there are no high-voltage power lines? - CORRECT ANSWER - The buildup of lethal
amounts of static electricity on the fiber-optic cable that can discharge through a person on a
ladder or some other conductor connected to ground.
What is used in outside plant fiber-optic cable to protect and isolate the optical fibers from
stress? - CORRECT ANSWER - Strength members and buffer tubes.
What is the purpose of grounding to earth? - CORRECT ANSWER - To protect against the
adverse effects of lightning and reduction of static.
What is the minimum amount of slack that must be provided for splicing fiber-optic cable in
underground installations? - CORRECT ANSWER - 15 meters on both the inbound and
outbound span.
What information is documented at fiber-optic slack and splice locations? - CORRECT
ANSWER - Incoming and outgoing sequential markings showing the cable's physical length.
What can be attached to the pulling line to prevent the fiber-optic cable from twisting during
installation? - CORRECT ANSWER - A break-away swivel.
What are two critical factors for a successful installation of fiber-optic cable? - CORRECT
ANSWER - Cable pulling tension and cable bend radius.
, What should be done to prevent the buildup of lethal amounts of static electricity on long lengths
of aerial fiber-optic cable? - CORRECT ANSWER - Install grounding clamps, which connect
the cable exterior and metallic messengers to a good solid ground at each pole site.
When working on a ladder, which rungs are forbidden for standing? - CORRECT ANSWER -
The top two rungs of any ladder.
Which component of an optical modulation system contains an optical detector and a
demodulator? - CORRECT ANSWER - Optical receiver.
What is digital modulation? - CORRECT ANSWER - It is the interruption of light waves in a
coded sequence.
Select the answer that best completes this sentence: In analog modulation, the _____ of the light
wave changes in _____ proportion to the _____ analog signal. - CORRECT ANSWER -
Intensity; direct; incoming.
Which type of optical detection involves a photodiode that converts the light waves to an
electrical signal that varies in proportion to intensity changes in the light waves? - CORRECT
ANSWER - Direct.
Which layer of a synchronous optical network (SONET) maps the signals into a synchronous
payload envelope (SPE)? - CORRECT ANSWER - Path.
The frame structure of a synchronous transport signal (STS) is divided into two parts. What are
they? - CORRECT ANSWER - Transport overhead - contains section + line layers
Synchronous payload envelope - contains path overhead + payload data
What occurs in the wavelength division multiplexing (WDM) process? - CORRECT
ANSWER - The optical output from multiple lasers operating at different wavelengths is
combined and transported over a single, common optical fiber.
