Progression: Maintenance Tech I - II Conventional Exam with 100% Correct Answers 2023

According to SCTE- and NCTA-recommended trunk system map symbols, fiber-optic cable is represented by - Correct answer-Double arrows within a small circle on a solid line. The forward path signal in a traditional tree-and-branch architecture - Correct answerOriginates at the headend and is transmitted downstream through coaxial trunk cable and trunk amplifiers. In an HFC network, - Correct answer-Processing equipment in the headend converts the forward RF signal to a light signal. During aerial plant construction, - Correct answer-The strand is tensioned so its sag profile matches that of the overhead utility power lines. With underground plant construction, - Correct answer-The fiber-optic and coaxial cables are often placed underground with other utility lines to jointly share construction costs. Standby power supplies - Correct answer-Continue providing an output voltage even during a utility power outage by using a backup power source. Centralized power configurations - Correct answer-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 answer-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 answer-Have attenuator pads, equalizers, and diplex filters that control and route the RF signals. Verifying plant reliability includes - Correct answer-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 answer-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 answer-All types of leaks must be fixed. According to the FCC, the leakage log should contain which of the following? - Correct answer-The probable cause of the leakage. Which of the following FCC required information must a cable system keep on file for two years? - Correct answer-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 answer-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 answer-Drive around until an absolute peak is found. Which of the following best describes demand maintenance procedures with regard to signal leakage? - Correct answer-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 answer-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. Which typical over-the-air signal sources can cause a false alarm with a signal leakage detector? - Correct answer-Typical sources include aircraft communication signals and ham, mobile, and government radio broadcasts. When adjusting or selecting the elements of a dipole antenna for measuring signal leakage, what is the approximate length of each element relative to the wavelength of the signal being measured? - Correct answer-One-quarter wavelength. Which of the following problem(s) are caused by egress? - Correct answer-Interference with aeronautical navigation and communication, amateur radio, public service, and cellular communications. What cumulative leakage index (CLI) meets Federal Communications Commission (FCC) requirements? - Correct answer-64 or less. What is the maximum allowable signal detectable in the airspace during a flyover? - Correct answer-10 µv/m. CLI calculations do not include leakage below: - Correct answer-50 µv/m. Which of the following is a repair order specification when measuring leakage levels? - Correct answer-The location of the leak. What is the FCC specification regarding repair of leakage of the 20 µv/m level?. - Correct answer-There is no FCC specified time. A dipole antenna is used for FCC tests because: - Correct answer-Its performance is well characterized. What are the disadvantages of using an SLM for leakage detection? - Correct answerLess sensitive than a leakage detector and doesn't have an alarm. How long must the leakage log be kept on file? - Correct answer-2 years. What leakage level must be entered in the leakage log? - Correct answer-Leaks 20 µv/m or higher measured 10 feet from the cable. In modern sweep systems, what type of nonintrusive and noninterfering test signal is inserted into the downstream? - Correct answer-Narrow-band continuous wave (CW) test carriers, called pulses, at frequencies between channels. Across 6 MHz, what is the maximum in-channel frequency response (ICFR) defined in the Data Over Cable Service Interface Specification (DOCSIS)? - Correct answer-3.0 dB peak-to-valley (P/V). When sweeping the upstream return path in a hybrid fiber coax (HFC) network, where are the upstream levels and sweep responses measured? - Correct answer-The headend. Even though the downstream sweep test pulses are intended to fit in the narrow frequency band between channels, what parameter can cause interference if set too high? - Correct answer-Sweep test pulse amplitude. What does a normalized reference trace from a fiber-node test point eliminate from the sweep process? - Correct answer-Slope and response variations of the headend and optical transport. How must a directional test point be installed in an amplifier to enable insertion of upstream sweep pulses and view the downstream sweep? - Correct answer-In a path common to the downstream and upstream. What could cause low-frequency roll-off of the downstream spectrum discovered when sweeping an amplifier? - Correct answer-A loose seizure screw in the downstream path. When standing waves are displayed in the sweep response, what does the frequency separation between response peaks indicate? - Correct answer-The approximate distance from the test point to the fault. What do normalized reference traces taken at a fiber-node test point establish? - Correct answer-Baseline sweep responses that are used to balance and sweep all the amplifiers serviced by that fiber-node.