UPDATED NCTI FIBER II EXAMINATION 2026
QUESTIONS WITH 100% CORRECT ANSWERS
◉ What is a safety concern when aerial fiber-optic cable is installed
between poles, even though there are no high-voltage power lines?
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? Answer: Strength members
and buffer tubes.
◉ What is the purpose of grounding to earth? 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? Answer: 15
meters on both the inbound and outbound span.
,◉ What information is documented at fiber-optic slack and splice
locations? 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? Answer: A break-away
swivel.
◉ What are two critical factors for a successful installation of fiber-
optic cable? 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? 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? Answer: The top two rungs of any ladder.
◉ Which component of an optical modulation system contains an
optical detector and a demodulator? Answer: Optical receiver.
◉ What is digital modulation? 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. 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? Answer: Direct.
◉ Which layer of a synchronous optical network (SONET) maps the
signals into a synchronous payload envelope (SPE)? Answer: Path.
◉ The frame structure of a synchronous transport signal (STS) is
divided into two parts. What are they? Answer: Transport overhead -
contains section + line layers
Synchronous payload envelope - contains path overhead + payload
data
◉ What occurs in the wavelength division multiplexing (WDM)
process? Answer: The optical output from multiple lasers operating
at different wavelengths is combined and transported over a single,
common optical fiber.
QUESTIONS WITH 100% CORRECT ANSWERS
◉ What is a safety concern when aerial fiber-optic cable is installed
between poles, even though there are no high-voltage power lines?
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? Answer: Strength members
and buffer tubes.
◉ What is the purpose of grounding to earth? 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? Answer: 15
meters on both the inbound and outbound span.
,◉ What information is documented at fiber-optic slack and splice
locations? 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? Answer: A break-away
swivel.
◉ What are two critical factors for a successful installation of fiber-
optic cable? 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? 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? Answer: The top two rungs of any ladder.
◉ Which component of an optical modulation system contains an
optical detector and a demodulator? Answer: Optical receiver.
◉ What is digital modulation? 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. 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? Answer: Direct.
◉ Which layer of a synchronous optical network (SONET) maps the
signals into a synchronous payload envelope (SPE)? Answer: Path.
◉ The frame structure of a synchronous transport signal (STS) is
divided into two parts. What are they? Answer: Transport overhead -
contains section + line layers
Synchronous payload envelope - contains path overhead + payload
data
◉ What occurs in the wavelength division multiplexing (WDM)
process? Answer: The optical output from multiple lasers operating
at different wavelengths is combined and transported over a single,
common optical fiber.
