NCTI jones ROC II NCTI 2 Course 1 Actual

NTCI Troubleshooting Advanced Services NCTI jones ROC II NCTI 2 Course 1 Actual Exam Latest Update Questions and Correct Answers Rated A+

To resolve where the source of a digital video problem lies, a technician uses -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 -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 -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? -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? -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 -ANSWER-A) Try an alternate HDMI port on the device, if one is available.

When equipment is connected via the component video output, - 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 - 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)? -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 - 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 - 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, - 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 - 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 -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.

In intraframe coding, data for redundant pixel arrays are -ANSWER-B) Transmitted once with data that tells the decoder where, on the single frame, the array is displayed.

Interframe coding, a form of temporal compression, uses -ANSWER-

• An intra-coded frame to compare picture information between

consecutive frames, using motion vectors, which results in predicted frames (P-frames).

Rate shaping, a possible point of failure for digital video in the headend, describes -ANSWER-B) The process of managing the data rates of multiplexed individual channels on a quadrature amplitude modulation (QAM) carrier.

Some of the common causes of digital video impairments in a distribution network include -ANSWER-D) Incorrect signal levels, common path distortion caused by corroded connections, and impedance mismatches due to unterminated taps.

Regarding digital video quality at the customer premises, -ANSWER-

• Quality of service (QoS) metrics are important to help identify

potential problems before they can affect a customer's more subjective quality of experience (QoE).

Although off-network programming is not the responsibility of a cable operator, -ANSWER-A) A technician needs to understand that customers viewing video through the Internet may report problems with a video program that has not been scrutinized by the cable operator.

The digital artifacts referred to as blockiness, blurring, mosquito noise, and contour represent -ANSWER-B) Digital video artifacts originating in the cable distribution network, which may be resolved by replacing faulty coax.

Tiling, missing audio, and frozen picture are examples of artifacts that -ANSWER- Are likely under the control of the technician in the hybrid fiber/coax (HFC) network or at the customer premises.

The poor quality of analog programming displayed on a digital TV set, a common complaint of customers, can be caused by -ANSWER- Image rescaling that standard definition TV (SDTV) analog programs require to be displayed on a 1080p resolution display.

The digital video artifacts of loss of lip sync and smearing are associated with -ANSWER- The types of artifacts generally found at the customer premises due to timing delay and frame rate, respectively.

One of the first things a technician needs to address in troubleshooting issues with digital video quality is -ANSWER- Identify