Comcast Tech Training Test Bank 2024 Questions 100% Solved

What is a radio wave? - A radio wave is an electromagnetic wave that has been produced by a transmitter. Which analog TV channels are adjacent to each other by channel name but not in frequency? - Channels 4 and 5, and channels 6 and 7 What is attenuation and insertion loss? - Attenuation is the difference in RF energy between two points. It is measured in decibels. Insertion loss is a drop in signal level that occurs when a passive device is inserted into the coax. Name some factors that cause cable attenuation. - Factors that affect coax attenuation: i. Devices spliced into the drop ii. Frequency of the carrier iii. Temperature iv. Length and gauge of the coax Identify the devices that significantly increase passive loss, if they are faulty, or have been inserted incorrectly. - Devices that significantly increase passive loss, if they are faulty, or have been inserted incorrectly, are: i. Splitters ii. Directional couplers iii. Drop taps iv. POE filter v. Barrel splice What is the difference between dB and dBmV? - dB is a relative logarithmic unit. It often refers to a change, such as "the level increased by 3 dB." dBmV however is an absolute measurement of signal level. An absolute signal is something that can be measured with your meter. List some of the uses of coaxial cable. - Uses of coaxial cable: i. Used in transporting radio signals ii. Used in data, voice, and television communication, where RF energy is used as the transport medium What is the preferred method of coax cable routing? Why? - The best method of coax cable routing is the home run. It is dedicated to each outlet, allowing greater flexibility and management of RF. It provides greater reliability as a fault in any one run will not impact other outlets. How can ingress affect Comcast? - Ingress can: i. Affect the quality of our services; it may even cause a major disruption ii. Cause an excessive number of customer complaints The root cause of the ingress may also be a source of egress or signal leakage. What are the sources of signal leakage? - The sources of signal leakage are: i. Poorly constructed or loose F-connectors in the drop ii. Staples or sharp objects piercing the cable jacket iii. Abrasion from mortar, brick, or metal structures iv. Poor quality or inferior coax installed into the drop by a third party v. Cable that has been chewed on by rodents or dogs vi. Loose POE filter, or an improperly installed terminator vii. Antenna cable accidentally connected at the Comcast splitter The features offered by XFINITY On Demand are: - i. Watch favorite movies and TV shows anytime and anywhere on TV and online, on the tablet or smartphone ii. Select from a wide selection of movies and TV series iii. Stop a TV show or movie and watch it later iv. On-screen guide search capabilities v. Parental controls vi. AnyRoom DVR and On Demand The benefits of the XFINITY TV HD service are: - i. More HD Choices than Satellite ii. More than 8,000 HD choices available On Demand iii. Access to STARZ® HD movies On Demand, before their network premieres iv. No additional HD programming fees The benefits of XFINITY Internet are: - i. Fast speeds even with the whole family online ii. Share music and upload photos in the blink of an eye iii. Play games online with less latency iv. Constant Guard and XFINITY Connect provided Some of the features of XFINITY Voice are: - i. 3-Way Calling ii. Anonymous Call Rejection iii. Call Forwarding, Call Forwarding Selective iv. Call Return v. Call Screening vi. Call Waiting vii. Caller ID and Caller ID with Call Waiting viii. Caller ID Blocking Per Call and Blocking Per Line ix. Repeat Dialing x. Speed Dial