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Progression: Maintenance Tech I - II Conventional: Exam Review Answered.

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Progression: Maintenance Tech I - II Conventional: Exam In the tree-and-branch architecture, how is the downstream signal from the trunk fed to the distribution branches? What is a common solution when congestion from modem activity and traffic becomes unacceptable in a hybrid fiber/coax (HFC) network? What technologies are defined in DOCSIS 4.0 to help sustain the hybrid fiber/coax (HFC) network infrastructure for several more years? How can a less-experienced technician identify what non-standard symbols on the network design maps represent? What is the RF distribution tap value indicated on the tap face plate by a sticker or number stamped into the housing? How can a distribution amplifier be identified in the network or on a network design map? - What is spliced into the hardline coaxial cable to combine the AC power with the transported RF signal in a hybrid fiber/coax (HFC) network? What test instrument sends out a test signal and displays any reflections caused by impedance mismatches in the cable that are characteristic of cable faults? What should you be looking for when analyzing the network design maps to troubleshoot a problem? What is required for checking the physical network integrity when maintaining the coaxial cable network? Which of the following problem(s) are caused by egress from a hybrid fiber/coax (HFC) network? What leakage level must be entered in the leakage log? Which is a benefit of an aggressive signal leakage policy? What is done for leak measuring 1.25 microvolts per meter (μV/m) from about 160 feet away from the coaxial cable network? If the leakage detector indicates there is a leak and displays a reading of 14 microvolts per meter (uV/m) measured at 80 feet from a possible leak source, what is the approximate calculated level of the leak from 10 feet? When using the triangulation technique to find the source of a leak, why is a dipole antenna used? When trying to find the source of a very strong leakage signal, what should be done? When troubleshooting signal leakage in the drop system, what does it mean if all signs of signal leakage disappear when the ground block is disconnected and terminated on the side connected to the customer premises? According to the Federal Communications Commission (FCC) leakage regulations, what distance must an antenna be from the network for leakage level measurements? When calculating the network cumulative leakage index (CLI), what is done with leaks that are equal to or greater than 50 microvolts per meter (µVm) measured 10 feet from the network? - In modern sweep systems, what type of nonintrusive and noninterfering test signal is inserted into the downstream? Across 6 MHz, what is the maximum in-channel frequency response (ICFR) defined in the Data Over Cable Service Interface Specification (DOCSIS)? When sweeping the upstream return path in a hybrid fiber coax (HFC) network, where are the upstream levels and sweep responses measured? 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? What does a normalized reference trace from a fiber-node test point eliminate from the sweep process? How must a directional test point be installed in an amplifier to enable insertion of upstream sweep pulses and view the downstream sweep? What could cause low-frequency roll-off of the downstream spectrum discovered when sweeping an amplifier? When standing waves are displayed in the sweep response, what does the frequency separation between response peaks indicate? What do normalized reference traces taken at a fiber-node test point establish? Why is the main downstream output/upstream input port of a distribution amplifier typically the first to be swept in the downstream direction? What advantage is realized by increasing the voltage in a broadband cable network from 60 volts alternating current (VAC) to 90 volts? How does surge protection at the input and output of a ferroresonant power supply defend against voltage surges? Which part of a ferroresonant transformer regulates the load on the secondary winding? In a standby network power supply, what comes online to convert the battery voltage to alternating current (AC), which then goes to the ferroresonant transformer? In a power inserter with three filtering networks, what is the purpose of the high-pass filter? What inserts alternating current (AC) into the network with a direct connection to an amplifier rather than using a power inserter? - What is the advantage for supplying alternating current (AC) to multiple amplifiers from one network power supply? - Where is a clamp-on ammeter attached to measure the output current from a network power supply? - What is a priority in any standby power supply maintenance program? What is the voltage into the second amplifier in cascade, if each amplifier draws 1.5 amps of current, the loop resistance of each section of cable is 1.38 ohms, and the alternating current (AC) source is a 90 volts AC (VAC) network power supply? What enables set-top boxes (STB) and Data Over Cable Service Interface Specification (DOCSIS) modems to operate as completely separate systems that operate independent of each other? - What did the 1.1 version of the Data Over Cable Service Interface Specification (DOCSIS) introduce, incorporating solutions for transporting real-time data applications (such as voice traffic) over the cable operator's managed IP network, and doing so with quality comparable to that of the telephone company? Why is 38 MHz typically the highest frequency in the sub-band frequency that is used for upstream modem transmissions? What enables the set-top box (STB) upstream carrier to be located below 20 MHz and still be reliably received? What system is a byproduct of the "funneling effect"? House amplifiers with a passive return path are used for what type of situation? Why does the output level from customer premises equipment (CPE) vary? When calculating return path attenuation in the drop system, what is the attenuation loss through the hot-leg of an unbalanced three-way splitter at sub-split frequencies? What purpose do diplex filters fulfill when installed at the input and output of a two-way amplifier module? How does the signal attenuation through coaxial cable in the sub-band frequency spectrum compare to the attenuation at forward path frequencies? - What recourse do broadband cable operators have if citizens band (CB) and ham radio signals ingress into their network? How is impulse noise characterized when viewed on a spectrum analyzer? How can the amount of thermal noise added to a network be minimized? - What location in the network is common path distortion (CPD) most severe? - What distinguishes a micro-reflection from other types of signal reflections? - What are the symptoms of hum on an upstream digital modulation channel? Why is it imperative to keep all ingress and impulse noise, even that outside the frequency range of the RF return carriers, to a minimum? When looking at a cable modem's PreEqualization Tap response, what do you know if the ninth bar is less than 10 dB below the eighth bar?. What practice can uncover potential return path problems in the drop system that can be mitigated before entering the network? Why is installing high-pass filters (HPF) at the tap on drops without two-way services considered a short-term solution to ingress and impulse noise migrating into the hybrid fiber/coax (HFC) network? Main Menu2of12 What should be done before diagnosing a return path problem in the drop system? What spectrum analyzer function is particularly useful as it captures and holds ingress, impulse noise, and other impairments on its display so that they can be viewed and analyzed? What should be done when the location of electrical interference in the power network is identified? - What can be used with a signal level meter (SLM) to check the drop system for RF continuity at sub-band frequencies? What information can be gathered by a return path monitoring system that captures the quadrature amplitude modulation (QAM) return channel from a DOCSIS modem? What feature of DOCSIS proactive network maintenance (PNM) can save the technician hours of troubleshooting? When should a preamplifier be used to measure impairments with a spectrum analyzer? What does the spectrum analyzer Zero Span function do? How is laser clipping in the return path characterized on a spectrum analyzer? If a return path impairment appears to be caused by impulse noise, why is it a good idea to begin troubleshooting at distribution taps of 17 dB or lower? What amplitude level should the output of return amplifiers be adjusted? - What should be checked if a large percentage of set-top boxes (STB) transmit above 55 dBmV, the upper end of the STB transmission level range? What type of measurement removes any errors attributable to bandwidth and provides an "apples-to-apples" comparison between carriers of differing bandwidths? Why are RF return channel carriers unusable for aligning return path equipment? Why are 6 MHz and 41 MHz good choices for test carriers when injecting test carriers into a return path spectrum of 5 MHz to 42 MHz? Where should the injected sweep pulses be placed to avoid interference with active return carriers when sweeping the return path? What is reported when the signal level meter (SLM) in a return path alignment system displays the return test carriers as a delta measurement? When is the return path considered to be properly balanced with unity gain? What should be done about injected test carriers at the node appearing at the transceiver in the headend with frequency response variations of less than 1 dB? The return path alignment system transceiver is specified to have 0 dBmV from 5 MHz to 42 MHz. With injected test carriers that are flat across the return spectrum and the input to a line extender at the correct level, what value equalizer and attenuator pad should be installed if the transceiver reports 3.2 dBmV at 6 MHz and 2.5 dBmV at 41 MHz? Equalizers come in 2 dB increments and attenuator pads in 1 dB increments? Which type of digital modulation contains four symbols with 2 bits in each symbol? How many decimal values can eight bits of data represent? What is a characteristic of orthogonal frequency division multiplexing (OFDM) channel subcarriers? What media access control (MAC) protocols are specified for digital set-top boxes (STB)? - Which advanced Physical Layer (PHY) technology developed and added to DOCSIS 2.0 includes byte interleaving? Chipsets with ingress cancellation algorithms are most effective for removing impairments in what portion of the RF return frequency spectrum? The code words and spreading algorithm of synchronous code division multiple access (S-CDMA) enable simultaneous transmission of up to how many modems on the same RF return channel? What happens to the data throughput when transitioning from quadrature phase shift keying (QPSK) to 16-QAM (quadrature amplitude modulation) in a channel of the same bandwidth? - What access schemes were introduced with advanced Physical (PHY) Layer technologies in DOCSIS 2.0? - In a DOCSIS 3.1 orthogonal frequency division multiple access (OFDMA) upstream channel, the average power of the subcarriers are normalized to what bandwidth? Which optical band is used for optical amplifiers due to the attenuation loss and availability of economical optical amplifiers? What is one limitation of Fabry-Perot (FP) lasers that is eliminated in distributed feedback (DFB) lasers? In what applications are avalanche photodiodes (APD) most likely to be used? Why is the E band undefined for fiber-optics communications? In the traditional analog return path, what is critical about the upstream optical transmitter? - In a traditional analog return, the optical detectors are responsive to the power of the received signal. How does the signal level at the output of the upstream receiver relate to changes to its input power? -. Why is using dBmV, a voltage measurement, acceptable to express the power per Hz power allocation across the channel bandwidth? When aligning the optical return path, what are the ideal characteristics of the test signal injected into the upstream optical transmitter? What evolved after the introduction of switched digital video (SDV) illustrated some limitations of legacy hybrid fiber coax (HFC) networks? What is it necessary in the optical return path to get the most performance from the DOCSIS 3.1 specification? The proper calibration of test equipment is necessary to ensure accurate measurements. Calibration must be performed using test equipment and signals whose accuracy is validated and traceable to what agency? Specific test equipment is necessary to complete proof-of-performance (POP) tests in the headend. Which piece of test equipment is used for headend POP measurements? Which calibration is acceptable for FCC proof-of-performance (POP) testing? Why is the use of spreadsheets to detail proof-of-performance test procedures recommended? What must occur in a video signal in order to observe the composite triple beat (CBT) on a spectrum analyzer? The number of field test points for proof-of-performance tests depends on: To minimize the burden on small cable operators, FCC proof-of-performance (POP) testing is required in systems having a minimum of how many customers? Where should at least one proof-of-performance test point be located? What guidelines does the FCC specify for how the proof-of-performance (POP) tests are performed? When performing proof-of-performance (POP) testing, why should a bandpass filter be used during the video signal to coherent beats test? Besides RS-232 ports, what type of interface is common on an optical power meter? Optical power meters used for testing fiber-to-the-user (FTTx) installations operating downstream from the headend should be calibrated for which wavelengths? A wavelength-isolating power meter is most commonly used in Optical loss test sets perform multiple functions because they include the features of multiple pieces of test sets. The features of which other test sets are combined into an optical loss test set? How has the optical power meter changed? What must the technician be aware of when measuring transmit and receive power with an optical power meter? - What must the technician be aware of when measuring end-to-end attenuation? What do most models of laser light sources use as operational status indicators? What occurs when a laser light source is used to test fibers? Which of the following is true regarding optical fiber identifiers?

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Progression: Maintenance Tech I - II Conventional
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Progression: Maintenance Tech I - II Conventional
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Progression: Maintenance Tech I - II Conventional

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February 22, 2023
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  • progression maintenance tech i ii conventional exam
  • progression maintenance tech i ii conventional test
  • in the tree and branch architecture
  • how is the downstream signal from the trunk fed

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Progression: Maintenance Tech I - II Conventional: Exam In the tree-and-branch architecture, how is the downstream signal from the trunk fed to the distribution branches? -ANSWER-: Within each trunk amplifier, a portion of the downstream is fed to a bridger amplifier to boost the signal before being split and routed to the distribution branches.
What is a common solution when congestion from modem activity and traffic becomes unacceptable in a hybrid fiber/coax (HFC) network? -ANSWER-: Node splitting, the subdividing of serving areas into two or more smaller serving areas.
What technologies are defined in DOCSIS 4.0 to help sustain the hybrid fiber/coax (HFC) network infrastructure for several more years? -ANSWER-: Full Duplex DOCSIS (FDX) and Extended Spectrum DOCSIS (ESD).
How can a less-experienced technician identify what non-standard symbols on the network design maps represent? -ANSWER-: The legend at the bottom of the network design map that defines the map symbols,
cable types, and amplifier data .
What is the RF distribution tap value indicated on the tap face plate by a sticker or number stamped into the housing? -ANSWER-: The signal loss between the tap downstream input port and the tap ports.
How can a distribution amplifier be identified in the network or on a network design map? -
ANSWER-: The distribution amplifier has multiple downstream outputs.
What is spliced into the hardline coaxial cable to combine the AC power with the transported RF signal in a hybrid fiber/coax (HFC) network? -ANSWER-: A power inserter.
What test instrument sends out a test signal and displays any reflections caused by impedance mismatches in the cable that are characteristic of cable faults? -ANSWER-: Time domain reflectometer (TDR)
What should you be looking for when analyzing the network design maps to troubleshoot a problem? -ANSWER-: The device common to those customers affected before traveling to make signal status checks. What is required for checking the physical network integrity when maintaining the coaxial cable
network? -ANSWER-: Being observant and performing some minor tasks while engaged in regularly scheduled activities.
Which of the following problem(s) are caused by egress from a hybrid fiber/coax (HFC) network? -ANSWER-: Interference with aeronautical navigation and communication, amateur radio, public service, and cellular communications.
What leakage level must be entered in the leakage log? -ANSWER-: Leaks 20 microvolts per meter (μV/m) or higher measured 10 feet from the cable.
Which is a benefit of an aggressive signal leakage policy? -ANSWER-: Decreased ingress-related service calls.
What is done for leak measuring 1.25 microvolts per meter (μV/m) from about 160 feet away from the coaxial cable network? -ANSWER-: The leak level is likely 20 μV/m or higher when measured 10 feet from the cable and must be fixed and recorded in the leakage log.
If the leakage detector indicates there is a leak and displays a reading of 14 microvolts per meter (uV/m) measured at 80 feet from a possible leak source, what is the approximate calculated level of the leak from 10 feet? -ANSWER-: 112 uV/m.
When using the triangulation technique to find the source of a leak, why is a dipole antenna used? -ANSWER-: The dipole antenna is directional and picks up the strongest signal that is at a right angle, or perpendicular to the antenna elements.
When trying to find the source of a very strong leakage signal, what should be done? -ANSWER-: Reduce the sensitivity of the leakage detector or even remove the antenna and allow the connector alone to pick up the leakage signal.
When troubleshooting signal leakage in the drop system, what does it mean if all signs of signal leakage disappear when the ground block is disconnected and terminated on the side connected to the customer premises? -ANSWER-: Something in the customer premises is the leakage source .
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