NCTI Troubleshooting Advanced
Services | Questions and Answers
Graded A+
To resolve where the source of a digital video problem lies, a
technician uses - Correct Answer - C) The divide-and-conquer
method for troubleshooting, which can begin with measurements
on customer premise equipment that offer easier access for
testing.
In addition to being accurate and detailed, a successful
troubleshooter knows that - Correct Answer - B) A critical step in
troubleshooting is verifying the signal levels and signal quality at
the tap to establish the baseline performance for the installation.
In troubleshooting a digital-to-analog converter, try the suspect
converter in a different, working outlet to - Correct Answer - B)
Determine if the original outlet needs to be repaired.
Digital set-top box diagnostics can aid a technician with which of
the following parameters while troubleshooting? - Correct
Answer - A) Service authorization, received signal quality, and
return path operations.
,If a digital video service customer reports that the set-top box
does not respond to the remote control, what is the quickest and
easiest thing to do first? - Correct Answer - C) Check the line of
sight between the remote control and the set-top box.
When a communications issue is suspected in an HDMI device,
the technician should - Correct Answer - A) Try an alternate
HDMI port on the device, if one is available.
When equipment is connected via the component video output, -
Correct Answer - C) Format settings for vertical resolution, scan
method, and aspect ratio may need to be adjusted manually.
To eliminate possible causes of audio issues, a technician can -
Correct Answer - A) Check the set-top box (STB) and the
television set to ensure audio connections have been made
correctly.
Which of the following are among the reasons why a customer
may not be able to order video-on-demand (VOD)? - Correct
Answer - C) VOD or pay-per-view (PPV) credit limits might have
been reached, indicating that purchases have not been collected
due to a return path problem.
, If a digital video service customer calls with an issue related to not
being able to delete a recorded program, it could be caused by -
Correct Answer - C) The program is being played on a second
set-top box in a whole house or multi-room digital video recording
(DVR) configuration.
Quality of service (QoS), as measured by availability, describes
the - Correct Answer - B) Ratio of time that a system or service
is available for use to total time.
To determine if objective network data measured by quality of
service (QoS) parameters match a customer's overall satisfaction
level, - Correct Answer - B) Cable operators use a quality of
experience (QoE) measurement based on mean opinion score
(MOS) and perceptual quality metrics (PQM).
Perceptual quality metrics (PQM) provide cable operators with -
Correct Answer - B) An objective measurement of human visual
perception based on a statistical analysis of quality of service
(QoS) measurements and MPEG encoding data.
Chrominance subsampling, which usually takes place in the
studio environment, is the process of - Correct Answer - D)
Compressing a raw digital video file so that each pixel retains its
own luminance information, but the chrominance is averaged from
the original pixel pairs to a 4:2:2 profile.
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