Broadband Digital Installer Questions with 100% Correct Answers

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? Correct Answer Digital signal analyzer functionality What is a risk of performing automated measurements on a sample of channels instead of all channels? Correct 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? Correct Answer Carrier 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 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? Correct 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)? Correct Answer WRONG. The amount of available set-top box (STB) memory, the number of program channels, and the amplitude of the out-of-band (OOB) carrier. A cable gateway can replace which broadband cable operator supplied devices? Correct Answer WRONG The cable gateway could replace a console TV and digital set-top box (STB). What forced customers to choose between the integrated entertainment system furniture cabinet and upgraded system components? Correct Answer Advances in technology, such as color television, upgraded turntables, etc. What functionality do many Blu-ray players have, besides playing back discs? Correct Answer Many Blu-ray players have built-in media streaming capabilities through a wired or wireless network connection. Entertainment cabinets with doors made of green glass block which of the following from electronic components? Correct Answer Infrared (IR) remote sensors. Main Menu2of12 The first version of the DOCSIS was approved as an international standard by what organization? Correct Answer The ITU What criteria does the DOCSIS certification process ensure Correct Answer Compliance with the DOCSIS standard and interoperability between suppliers. Which layers of the OSIOpen Systems Interconnection reference model are specific to cable networks and are present only between DOCSIS modems and the CMTSCable modem termination system? Correct Answer WRONG Layers 4 through 7 (Transport Layer, Session Layer, Presentation Layer, and Application Layer) are applied between the DOCSIS modem and CMTS. What communications access technology does the first version of the DOCSIS 1.0 use to send data upstream over the network's RFRadio frequency return path? Correct Answer TDMA What requirements were needed for PacketCable to deliver a quality and reliable telephone service over a DOCSIS access network? Correct Answer QoS Quality of service controls, enhanced security, and adaptive equalization in the upstream path. Main Menu7of12 What features were introduced with the 3.1 version of the DOCSIS 3.1 to increase the downstream and upstream data throughput? Correct Answer OFDM Orthogonal frequency division multiplexing and LDPC Low-density parity-check . Which DOCSIS version was the first to provide an option for raising the top frequency of the upstream spectrum to 85 MHzMegahertz in order to create enough bandwidth for upstream carriers from modems running on previous DOCSIS versions? Correct Answer DOCSIS 3.0. Main Menu9of12 Why are the data throughput rates for both downstream and upstream in DOCSIS networks asymmetrical? Correct 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 OSIOpen Systems Interconnection reference model layers does the MACMedia Access Control Layer in the DOCSIS overlap so that the MAC can be used by the CMTSCable modem termination system to differentiate between cable modems? Correct Answer The Physical and Data Link Layers