NCTI BDI Actual Exam Update

NCTI BDI Actual Exam Update Latest Questions and Correct Answers Rated A+

What 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? -ANSWER-Digital signal analyzer functionality

What is a risk of performing automated measurements on a sample of channels instead of all channels? -ANSWER-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? - ANSWER-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? -ANSWER-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? -ANSWER-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)? -ANSWER-The hard drive capacity and the format of the stored content.

A cable gateway can replace which broadband cable operator supplied devices? -ANSWER-A cable modem and a wireless telephone base

What forced customers to choose between the integrated entertainment system furniture cabinet and upgraded system components? -ANSWER-Advances in technology such as color TV, upgraded turntables, etc.

What functionality do many Blu-ray players have, besides playing back discs? -ANSWER-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? -ANSWER-Infrared (IR) Remote sensors

The first version of DOCSIS was approved as an international standard by what organization? -ANSWER-The International Telecommunication Union (ITU)

What layers of the OSI model are applied between DOCSIS modems and the CMTS? -ANSWER-Layers 1 through 4 - Physical, Data Link, Network, and Transport

What criteria does the DOCSIS certification process ensure? - ANSWER-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? -ANSWER- 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? - ANSWER-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? -ANSWER- 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? -ANSWER-DOCSIS 3.0

Why are the data throughput rates for both downstream and upstream in DOCSIS networks asymmetrical? -ANSWER-Because the narrower bandwidths and lower orders of modulation for the return path carriers cause the DOCSIS downstream and upstream data rates to be unequal or asymmetrical.

Which OSI reference model layers does the MAC Layer in the DOCSIS overlap? -ANSWER-Physical and Data link layers

From where do DOCSIS modems receive their configuration files, billing system messages, and access control messages? -ANSWER-

From the CMTS acting as a "proxy" or messenger that transfers messages and files between the modems and the respective servers.

If a customer already has cable television service and is adding high- speed data service, what should be checked on the digital television channels? -ANSWER-Intermittent operation, which is a symptom of noise or interference in the downstream.

Installing a cable modem and router in a closet or utility room is simplified by having what items in the room? -ANSWER-Easy access to coax, a power outlet for the modem and router, and a twisted-pair network cable that is tagged and has connectors installed using standard wiring configurations.

Which version of the DOCSIS included the option to increase the top frequency of the upstream to 85 MHz? -ANSWER-DOCSIS 3.0

Where should the customer be encouraged to go for info and questions before calling customer service? -ANSWER-Online -- FAQ

What device can be installed with a cable modem to enable Internet access to two or more devices in the customer premises? -ANSWER- A router with a built-in multi-jack Ethernet switch

Why is it a good practice to review the service work order with the customer before beginning a high-speed data service installation? - ANSWER-To verify account information and to confirm the high-speed data service order.

Some cable operators charge an additional fee when the amount of downloaded data during a billing cycle exceeds a prescribed limit.How might a customer unknowingly approach these limits? -