Progression: Maintenance Tech I - II Conventional - LATEST EXAM GUIDE

Progression: Maintenance Tech I - II Conventional - LATEST EXAM GUIDE 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 a byproduct of the "funneling effect"? CONTINUED....DOWNLOAD FOR BEST SCORES