NCTI MT1-MT2: QUESTIONS AND ANSWERS
According to SCTE- and NCTA- recommended trunk system map symbols,
fiber-optic cable is represented by Correct Ans - Double arrows within
a small circle on a solid line.
The forward path signal in a traditional tree-and-branch architecture
Correct Ans - originates at the headend and is transmitted downstream
through coaxial trunk cable and trunk amplifier.
In a HFC network, Correct Ans - Processing equipment in the headend
converts the forward RF signal to a light signal.
During aerial plant construction, Correct Ans - The strand is tensioned
so its sag profile matches that of the overhead utility power lines.
With underground plant construction, Correct Ans - The fiber-optic
and coaxial cables are often places underground with other utility lines to
jointly share construction costs.
Standby power supplies Correct Ans - continue providing an output
voltage even during a utility power outage by using a back up power source.
Centralized power configurations Correct Ans - provide the advantage
of increased reliability through sharing of expensive backup generators and
sophisticated monitoring equipment among different power realms.
When transmitting broadband signals Correct Ans - In a two way
hybrid fiber/coax (HFC) network, two or more individual optical fibers are
required for each optical node location.
RF trunk amplifiers Correct Ans - Have attenuator pads, equalizers,
and duplex filters that control and route the RF signals.
Verifying plant reliability includes Correct Ans - Frequency response
sweeping, which is adjusting RF amplifier circuits to amplify all frequencies in
the bandpass spectrum as equally as possible
, Which of the following is a requirement in the process for measuring leakage
using a dipole antenna, as required by the FCC? Correct Ans - The
antenna must be placed 3 meters from the system components and 3 meters
from the ground.
Many cable companies require which type of leaks to be fixed? Correct
Ans - All types of leaks must be fixed.
According to the FCC, the leakage log should contain which of the following?
Correct Ans - The probable cause of the leakage.
Which of the following FCC required information must a cable system keep on
file for two years? Correct Ans - Annual CLI calculations, regular
(quarterly) monitoring programs, and a list of all channels used in the
aeronautical bands.
If your leakage detector indicates there is a leak and displays a reading of 14
microvolts per meter (uV/m) when you are 80 feet from a possible leak
source, what is the approximate calculated level of the leak from 10 feet?
Correct Ans - 112 uV/m.
If a large signal leak is found in the aerial plant, what is a good first step in
locating the leak? Correct Ans - Drive around until an absolute peak is
found.
Which of the following best describes demand maintenance procedures with
regard to signal leakage? Correct Ans - The demand maintenance
procedures can improve the CLI measurement results by identifying and
correcting the largest leaks first.
When troubleshooting signal leakage in the drop system, what is indicated if
all signs of signal leakage disappear when the ground block is disconnected
and terminated on the side connected to the customer premises? Correct
Ans - The backward route from the ground block to the tap can be
eliminated as a source of The backward route from the ground block to the
tap can be eliminated as source of leakage.
According to SCTE- and NCTA- recommended trunk system map symbols,
fiber-optic cable is represented by Correct Ans - Double arrows within
a small circle on a solid line.
The forward path signal in a traditional tree-and-branch architecture
Correct Ans - originates at the headend and is transmitted downstream
through coaxial trunk cable and trunk amplifier.
In a HFC network, Correct Ans - Processing equipment in the headend
converts the forward RF signal to a light signal.
During aerial plant construction, Correct Ans - The strand is tensioned
so its sag profile matches that of the overhead utility power lines.
With underground plant construction, Correct Ans - The fiber-optic
and coaxial cables are often places underground with other utility lines to
jointly share construction costs.
Standby power supplies Correct Ans - continue providing an output
voltage even during a utility power outage by using a back up power source.
Centralized power configurations Correct Ans - provide the advantage
of increased reliability through sharing of expensive backup generators and
sophisticated monitoring equipment among different power realms.
When transmitting broadband signals Correct Ans - In a two way
hybrid fiber/coax (HFC) network, two or more individual optical fibers are
required for each optical node location.
RF trunk amplifiers Correct Ans - Have attenuator pads, equalizers,
and duplex filters that control and route the RF signals.
Verifying plant reliability includes Correct Ans - Frequency response
sweeping, which is adjusting RF amplifier circuits to amplify all frequencies in
the bandpass spectrum as equally as possible
, Which of the following is a requirement in the process for measuring leakage
using a dipole antenna, as required by the FCC? Correct Ans - The
antenna must be placed 3 meters from the system components and 3 meters
from the ground.
Many cable companies require which type of leaks to be fixed? Correct
Ans - All types of leaks must be fixed.
According to the FCC, the leakage log should contain which of the following?
Correct Ans - The probable cause of the leakage.
Which of the following FCC required information must a cable system keep on
file for two years? Correct Ans - Annual CLI calculations, regular
(quarterly) monitoring programs, and a list of all channels used in the
aeronautical bands.
If your leakage detector indicates there is a leak and displays a reading of 14
microvolts per meter (uV/m) when you are 80 feet from a possible leak
source, what is the approximate calculated level of the leak from 10 feet?
Correct Ans - 112 uV/m.
If a large signal leak is found in the aerial plant, what is a good first step in
locating the leak? Correct Ans - Drive around until an absolute peak is
found.
Which of the following best describes demand maintenance procedures with
regard to signal leakage? Correct Ans - The demand maintenance
procedures can improve the CLI measurement results by identifying and
correcting the largest leaks first.
When troubleshooting signal leakage in the drop system, what is indicated if
all signs of signal leakage disappear when the ground block is disconnected
and terminated on the side connected to the customer premises? Correct
Ans - The backward route from the ground block to the tap can be
eliminated as a source of The backward route from the ground block to the
tap can be eliminated as source of leakage.
