NCTI FIBER INSTALLATION AND
ACTIVATION 2026 EXAM WITH ACTUAL
EXAM QUESTIONS AND CORRECT
ANSWERS
Which standards organization is considered the creator of
the world's most recognized communications standards,
known as recommendations?
The International Telecommunications Union (ITU)
In which component in a fiber-optics communication system
do changes to the intensity of the optical signal occur?
The optical transmitter
What is one drawback of using Fabry-Perot (F-P) lasers in
high-speed data (HSD) networks?
The emission of several discrete wavelengths or side modes
Why are laser diodes most effective when coupled to single-
mode fiber (SMF)?
The laser diode has a small spectral width, efficient coupling, and
fast modulation speeds
What is the main factor in determining the sensitivity of an
optical receiver?
Noise
,Which diode is most commonly used in optical receivers
because it is inexpensive and can be operated from a
standard power supply?
Positive-intrinsic-negative (PIN) diode
What does the multiplication process, which amplifies the
electrical signal in an APD, introduce into the electrical
output of an optical detector?
Noise
Which type of diode requires a higher voltage power supply
and more complex circuitry than PIN diodes?
APD
Which of the following is the ratio of electrical output power
from the detector to the optical input power, expressed by
amperes or volts per watt of optical input power?
Responsivity
What type of LED has relatively narrow spectral widths, high
output power levels, and performs at high modulation rates?
Edge-emitting LED
Why was the zero-dispersion point in SMF moved to 1,550
nm?
To take advantage of SMF's low intrinsic absorption and lower
attenuation at 1550 nm
What type of SMF is ideal for FTTH installations
The ITU-T G.657 bend-insensitive fiber (BIF)
What are the primary causes of intrinsic loss in SMF
,Material absorption and Rayleigh scattering
Light is guided along the core of a fiber because of this
difference between the core and cladding
Refractive indexes
Where would you expect Fresnel reflections to occur in a
fiber-optic network?
At connections and mechanical splices where the signal source is
entering or exiting the cable
Chromatic dispersion is a combination of which two
dispersions?
Material and waveguide dispersion
When defining the optical transport region of SMF, specifying
which of the following is more accurate, technically correct
and critical to use?
Mode field diameter (MFD)
What is the current standardization outside diameter (OD) of
the cladding of SMF?
125 µm, with an accuracy of ±1 µm
What do diameter differences between spliced fibers look
like on an OTDR?
A gain in one direction and a high loss in the opposite direction
Besides protection, what else must the coating on an optical
fiber do?
Function over a wide temperature range
, What is involved when monitoring the status of optical
nodes?
The use of a node transponder that continuously monitors several
critical functions
What is an advantage of a digital return system?
The amount of fiber required in the network can be greatly
reduced by using dense wavelength division multiplexing
(DWDM) digital return transmitters in hub-to-headend
architectures
Broadband cable operators provide customers with HSD
connections to the Internet through their HFC networks
using what standard?
DOCSIS
What is MPEG?
A universally accepted standard for digital television, first released
in 1992.
Which of the following is true about optical nodes?
They contain four main sections: the optical receiver, the RF
amplifier module, the reverse optical transmitter, and the DC
power supply?
What product based on the DOCSIS defines the protocols for
IP telephony over HFC networks?
PacketCable
How does a centralized server VOD architecture simplify
server management compared to distributed server
architecture?
ACTIVATION 2026 EXAM WITH ACTUAL
EXAM QUESTIONS AND CORRECT
ANSWERS
Which standards organization is considered the creator of
the world's most recognized communications standards,
known as recommendations?
The International Telecommunications Union (ITU)
In which component in a fiber-optics communication system
do changes to the intensity of the optical signal occur?
The optical transmitter
What is one drawback of using Fabry-Perot (F-P) lasers in
high-speed data (HSD) networks?
The emission of several discrete wavelengths or side modes
Why are laser diodes most effective when coupled to single-
mode fiber (SMF)?
The laser diode has a small spectral width, efficient coupling, and
fast modulation speeds
What is the main factor in determining the sensitivity of an
optical receiver?
Noise
,Which diode is most commonly used in optical receivers
because it is inexpensive and can be operated from a
standard power supply?
Positive-intrinsic-negative (PIN) diode
What does the multiplication process, which amplifies the
electrical signal in an APD, introduce into the electrical
output of an optical detector?
Noise
Which type of diode requires a higher voltage power supply
and more complex circuitry than PIN diodes?
APD
Which of the following is the ratio of electrical output power
from the detector to the optical input power, expressed by
amperes or volts per watt of optical input power?
Responsivity
What type of LED has relatively narrow spectral widths, high
output power levels, and performs at high modulation rates?
Edge-emitting LED
Why was the zero-dispersion point in SMF moved to 1,550
nm?
To take advantage of SMF's low intrinsic absorption and lower
attenuation at 1550 nm
What type of SMF is ideal for FTTH installations
The ITU-T G.657 bend-insensitive fiber (BIF)
What are the primary causes of intrinsic loss in SMF
,Material absorption and Rayleigh scattering
Light is guided along the core of a fiber because of this
difference between the core and cladding
Refractive indexes
Where would you expect Fresnel reflections to occur in a
fiber-optic network?
At connections and mechanical splices where the signal source is
entering or exiting the cable
Chromatic dispersion is a combination of which two
dispersions?
Material and waveguide dispersion
When defining the optical transport region of SMF, specifying
which of the following is more accurate, technically correct
and critical to use?
Mode field diameter (MFD)
What is the current standardization outside diameter (OD) of
the cladding of SMF?
125 µm, with an accuracy of ±1 µm
What do diameter differences between spliced fibers look
like on an OTDR?
A gain in one direction and a high loss in the opposite direction
Besides protection, what else must the coating on an optical
fiber do?
Function over a wide temperature range
, What is involved when monitoring the status of optical
nodes?
The use of a node transponder that continuously monitors several
critical functions
What is an advantage of a digital return system?
The amount of fiber required in the network can be greatly
reduced by using dense wavelength division multiplexing
(DWDM) digital return transmitters in hub-to-headend
architectures
Broadband cable operators provide customers with HSD
connections to the Internet through their HFC networks
using what standard?
DOCSIS
What is MPEG?
A universally accepted standard for digital television, first released
in 1992.
Which of the following is true about optical nodes?
They contain four main sections: the optical receiver, the RF
amplifier module, the reverse optical transmitter, and the DC
power supply?
What product based on the DOCSIS defines the protocols for
IP telephony over HFC networks?
PacketCable
How does a centralized server VOD architecture simplify
server management compared to distributed server
architecture?
