(186-20-4) Troubleshooting Digital Video Service
It narrows the scope of likely problem sources.
After a digital TV (DTV) service problem has been analyzed and possible causes considered, what is accomplished by isolating the various network elements?
Operate the analog TV channels at higher amplitude level than the QAM channels.
Because the spectral density of a quadrature amplitude modulation (QAM) channel is much higher than that of an analog TV channel, what is done to ensure equal power in all channels in a network with analog and digital modulation channels?
Service authorization, received signal quality, and return path operations.
Digital set-top box diagnostics can aid a technician with which of the following parameters while troubleshooting?
Diagnosing symptoms.
During which step of the six-step troubleshooting process for a digital TV (DTV) service problem are quadrature amplitude modulation (QAM) channel measurements typically taken?
The divide-and-conquer method for troubleshooting, which can begin with measurements on customer premise equipment that offer easier access for testing.
To resolve where the source of a digital video problem lies, a technician uses
STB reception of authorization message data.
When troubleshooting a digital TV (DTV) authorization issue, what can be verified using the set-top box (STB) diagnostic page?
VOD order requests are unable to be received at the headend due to poor or nonexistent return path connectivity
Which of the following ae among the reasons why a customer may not be able to order video-on-demand (VOD)
Someone with an inquisitive and relentless desire to solve and fix problems.
Which of the following characterizes the successful troubleshooter?
The digital set-top box (STB) overheats.
Which of the following digital TV (DTV) trouble calls could have been avoided with customer education about the product?
STB with DOCSIS Set-top Gateway (DSG) client software and embedded DOCSIS modems.
Which type of set-top box (STB) operates more like Data Over Cable Service Interface Specification (DOCSIS) cable modems with return channels on the same frequencies used for cable modems?
Check the line of sight between the remote control and the set-top box
If a digital video serice customer reports that the set-top box does not respond to the remote control, what is the quickest and easiest thing to do first?
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 addition to being accurate and detailed, a successful troubleshooter knows that
The QAM channel quality is on the edge for reliable reception, and the source of the problem is likely in the distribution network or customer premises.
What does a set-top box (STB) diagnostic page of a quadrature amplitude modulation (QAM) channel showing signal-to-noise ratio (SNR) near or below 30 dB indicate?
There is frequently more than one contributor to a specific DTV service problem.
What must a technician be aware of when analyzing a digital TV (DTV) problem?
Confirmation reinforces the technician's confidence that the problem will be resolved by replacing the splitter.
When replacing a splitter to resolve a digital TV (DTV) service problem, what does confirming the splitter output levels before attaching the output connectors do?