NCTI 2020 Progression: Maintenance Tech I - II
Conventional Questions And Answers
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NCTI 2020 Progression: Maintenance Tech I - II Conventional Questions
And Answers
- According to SCTE- and NCTA-recommended trunk system map symbols,
fiber-optic cable is represented by: Double arrows within a small circle on a solid line.
2. The forward path signal in a traditional tree-and-branch architecture: Orig-
inates at the headend and is transmitted downstream through coaxial trunk cable and trunk amplifiers.
3. In an HFC network,: Processing equipment in the headend converts the forward
RF signal to a light signal.
- During aerial plant construction,: The strand is tensioned so its sag profile
matches that of the overhead utility power lines.
5. With underground plant construction,: The fiber-optic and coaxial cables are
often placed underground with other utility lines to jointly share construction costs.
6. Standby power supplies: Continue providing an output voltage even during a
utility power outage by using a backup power source.
- Centralized power configurations: Provide the advantage of increased reliabil-
ity through sharing of expensive backup generators and sophisticated monitoring equipment among different power realms.
8. When transmitting broadband signals: 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: Have attenuator pads, equalizers, and diplex filters that
control and route the RF signals.
10. Verifying plant reliability includes: Frequency response sweeping, which is
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NCTI 2020 Progression: Maintenance Tech I - II Conventional Questions
And Answers
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?: The antenna must
be placed 3 meters from the system components and 3 meters from the ground.
12. Many cable companies require which type of leaks to be fixed?: All types
of leaks must be fixed.
- According to the FCC, the leakage log should contain which of the follow-
ing?: The probable cause of the leakage.
- Which of the following FCC required information must a cable system
- If your leakage detector indicates there is a leak and displays a reading
keep on file for two years?: Annual CLI calculations, regular (quarterly) monitoring programs, and a list of all channels used in the aeronautical bands.
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?: 112
uV/m.
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NCTI 2020 Progression: Maintenance Tech I - II Conventional Questions
And Answers
- If a large signal leak is found in the aerial plant, what is a good first step in
locating the leak?: Drive around until an absolute peak is found.
- Which of the following best describes demand maintenance procedures
with regard to signal leakage?: The demand maintenance procedures can im-
prove 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?: The back-
ward 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.
- Which typical over-the-air signal sources can cause a false alarm with a
- When adjusting or selecting the elements of a dipole antenna for measur-
signal leakage detector?: Typical sources include aircraft communication signals and ham, mobile, and government radio broadcasts.
ing signal leakage, what is the approximate length of each element relative to
the wavelength of the signal being measured?: One-quarter wavelength.
21. Which of the following problem(s) are caused by egress?: Interference with
aeronautical navigation and communication, amateur radio, public service, and cellular communications.
- What cumulative leakage index (CLI) meets Federal Communications Com-
mission (FCC) requirements?: 64 or less.
- What is the maximum allowable signal detectable in the airspace during a
