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 ...
Progression: Maintenance Tech I - II
Conventional Question and Answers
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
radio, 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 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? - ✔ 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.
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? - ✔ Something in the customer premises
is the leakage source.
According to the Federal Communications Commission (FCC) leakage regulations,
what distance must an antenna be from the network for leakage level measurements? -
✔ The antenna must be 3 meters (10 feet) from the network elements and 3 meters (10
feet) above the ground.
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? - ✔ The leakage values are squared and then added together, then
multiplied times a factor based on how much of the network was tested in 90 days.
In modern sweep systems, what type of nonintrusive and noninterfering test signal is
inserted into the downstream? - ✔ Narrow-band continuous wave (CW) test carriers,
called pulses, at frequencies between channels.
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