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NCTI BDI Final Review
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NCTI BDI Final Review
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NCTI BDI Final ReviewWhat functionality is integrated in all modern signal level meters (SLM) to
measure specific parameters of a digital modulation carrier containing digital
television (DTV) and Data Over Cable Service Interface Specification (DOCSIS)
signals? Correct Ans - Digital signal analyzer functionality
What is a risk of performing automated measurements on a sample of
channels instead of all channels? Correct Ans - Problems in
unmeasured channels may go undetected.
Using a digital signal analyzer, what measurements are typically taken to
troubleshoot and diagnose a digital television (DTV) signal? Correct Ans -
Average power level, modulation error ratio (MER), and bit error ratio (BER).
How do cable operators ensure that only paying customers are receiving
digital television (DTV) service? Correct Ans - Cable operators prevent
unauthorized reception of DTV services by scrambling or encrypting the
services.
Why were digital terminal adapters (DTA) originally installed in the customer
premises? Correct Ans - Because the customer wanted service to their
analog TV and subscribed to basic-only service.
What determines the amount of content that can be stored on a digital video
recorder (DVR)? Correct Ans - The hard drive capacity and the format
of the stored content.
A cable gateway can replace which broadband cable operator supplied
devices? Correct Ans - A cable modem and a wireless telephone base
What forced customers to choose between the integrated entertainment
system furniture cabinet and upgraded system components? Correct Ans
- Advances in technology such as color TV, upgraded turntables, etc.
What functionality do many Blu-ray players have, besides playing back discs?
Correct Ans - Many have built in media streaming capabilities through a
wired or wireless connection.
, Entertainment cabinets with doors made of green glass block which of the
following from electronic components? Correct Ans - Infrared (IR)
Remote sensors
The first version of DOCSIS was approved as an international standard by
what organization? Correct Ans - The International
Telecommunication Union (ITU)
What layers of the OSI model are applied between DOCSIS modems and the
CMTS? Correct Ans - Layers 1 through 4 - Physical, Data Link,
Network, and Transport
What criteria does the DOCSIS certification process ensure? Correct Ans -
Compliance with the DOCSIS standard and interoperability between suppliers.
What access technology does the first version of the DOCSIS use to send data
upstream over the network's RF return path? Correct Ans - Time
division multiple access (TDMA)
What was added to the first DOCSIS that enabled broadband cable operators
to provide telephone service with quality and reliability that rivaled the
products of the traditional telephone companies? Correct Ans - Quality
of Service (QoS) controls, enhanced security, adaptive equalization in the
upstream path.
What features were introduced with the 3.1 version of DOCSIS to increase the
downstream and upstream data throughput? Correct Ans - Orthogonal
frequency division multiplexing (OFDM) and low-density parity-check (LDPC).
Which DOCSIS version was the first to provide an option for raising the top
frequency of the upstream spectrum to 85 MHz in order to create enough
bandwidth for upstream carriers from modems running on previous DOCSIS
versions? Correct Ans - DOCSIS 3.0
Why are the data throughput rates for both downstream and upstream in
DOCSIS networks asymmetrical? Correct Ans - Because the narrower
bandwidths and lower orders of modulation for the return path carriers cause
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