Progression: Maintenance Tech I - II Conventional: Exam Review Answered. In the tree-and-branch architecture, how is the downstream signal from the trunk fed to the distribution branches? 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? 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? 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? 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? 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? 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? 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? Time domain reflectometer (TDR) What should you be looking for when analyzing the network design maps to troubleshoot a problem? 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? 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? Interference with aeronautical navigation and communication, amateur rio, public service, and cellular communications. What leakage level must be entered in the leakage log? 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? 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? 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 reing 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? 112 uV/m. When using the triangulation technique to find the source of a leak, why is a dipole antenna used? 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? Reduce the sensitivity of the leakage detector or even remove the antenna and allow the connector alone to pick up the leakage signal.