construction coordinator 3 NCTI Questions With Complete
Solutions
Why is -48 VDC (volts of direct current) with a positive ground
used by the telecommunications industry?
This reverse polarity is a means of mitigating electrolytic
corrosion on the outside plant.
Which of the following is true of a centralized power node?
It can provide sufficient power for a fiber-optic node, including
outside plant amplifiers and customer premises network
interface devices (NID) for telephony service.
What is an option available on most optical nodes for connecting
to the power supply?
Through a power cable that is connected from the power supply
directly to the power port of the node.
Why do many optical nodes accept two independent power
supplies?
For redundant powering of the node.
In a hybrid fiber/coax (HFC) fiber optic node, what are common
voltages produced by DC power supplies?
Common voltages produced by DC power supplies include +5,
+12, and +24 VDC.
Which type of passive optical network (PON) access
architecture replaced asynchronous PON (APON)?
,Gigabit-capable PON (GPON).
Which type of passive optical network (PON) architecture was
formed to develop a cost-effective, high-bandwidth, easy-to-
provision solution for connecting businesses, schools, libraries,
and customer local area networks to the public Internet?
Ethernet PON (EPON).
What is the wavelength allocation for video distribution (RF
overlay) in broadband PON (BPON) access systems?
Between 1,550 and 1,560 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.
Which of the following is true 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.
The National Electrical Safety Code (NESC) requires drop
cables to be placed at what minimum depth?
18 inches.
When troubleshooting radio frequency over glass (RFoG) and
passive optical network (PON) FTTx systems that use longer
wavelengths, what is the common cause of higher losses that
should be addressed?
Macro-bends and micro-bends caused by improper bending and
pinching of cables and patch cords.
Which of the following is true about fiber network restoration
planning,
Responsibility for update and control of the restoration plan
document must be defined or it will quickly become obsolete
and useless.
Solutions
Why is -48 VDC (volts of direct current) with a positive ground
used by the telecommunications industry?
This reverse polarity is a means of mitigating electrolytic
corrosion on the outside plant.
Which of the following is true of a centralized power node?
It can provide sufficient power for a fiber-optic node, including
outside plant amplifiers and customer premises network
interface devices (NID) for telephony service.
What is an option available on most optical nodes for connecting
to the power supply?
Through a power cable that is connected from the power supply
directly to the power port of the node.
Why do many optical nodes accept two independent power
supplies?
For redundant powering of the node.
In a hybrid fiber/coax (HFC) fiber optic node, what are common
voltages produced by DC power supplies?
Common voltages produced by DC power supplies include +5,
+12, and +24 VDC.
Which type of passive optical network (PON) access
architecture replaced asynchronous PON (APON)?
,Gigabit-capable PON (GPON).
Which type of passive optical network (PON) architecture was
formed to develop a cost-effective, high-bandwidth, easy-to-
provision solution for connecting businesses, schools, libraries,
and customer local area networks to the public Internet?
Ethernet PON (EPON).
What is the wavelength allocation for video distribution (RF
overlay) in broadband PON (BPON) access systems?
Between 1,550 and 1,560 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.
Which of the following is true 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.
The National Electrical Safety Code (NESC) requires drop
cables to be placed at what minimum depth?
18 inches.
When troubleshooting radio frequency over glass (RFoG) and
passive optical network (PON) FTTx systems that use longer
wavelengths, what is the common cause of higher losses that
should be addressed?
Macro-bends and micro-bends caused by improper bending and
pinching of cables and patch cords.
Which of the following is true about fiber network restoration
planning,
Responsibility for update and control of the restoration plan
document must be defined or it will quickly become obsolete
and useless.
