System Design Module Test

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Rio Salado Community College *

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Electrical Engineering

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Feb 20, 2024

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System Design Module Test Question 1 Incorrect What is the C/N ratio at the output of a single amplifier with a noise figure (F) of 9 dB and an input power level of 12dBmV? Assume termination noise of minus 59.2dB. Answer: Question 2 Correct Name a modulation scheme typically used in the forward path or downstream. Select one: a. QPSK b. 16 QAM c. 64 QAM d. 256 QAM Question 3 Correct Strand maps show: (Choose 3) Select one or more: a. streets b. tap locations c. strand d. trench routes Question 4 Correct The difference between the most positive signal amplitude and the most negative signal amplitude levels of an electrical signal such as RF is called: Select one: a. carrier to noise b. peak to valley (trough) c. signal to noise d. wave to floor 68.2dB

Question 5 Correct Systems maps provide signal flow and are an important troubleshooting tool, so it is important to keep all maps: Select one: a. only used by back office engineering b. changed as often as possible c. stored in the supervisor office d. up-to-date to avoid misinformation Question 6 Correct True or False: The noise figure (F) is the degradation of the S/N or C/N ratio and the amount of noise that an amplifier will contribute to total system S/N or C/N ratio as the signal passes through the HFC. Select one: True False Question 7 Correct Name a cable design philosophy for amplifier spacing in the forward and return path, where the total loss of the amount of coax cable and passive device loss in the network before an amplifier will equal the gain of the amplifier. Select one: a. amplifier gain b. frequency gain c. loss / gain design d. unity gain Question 8 Incorrect CSO changes ___ dB for every 1 dB change in RF output levels. Answer: Question 9 Incorrect A chart used to display various information about a node, amplifier or a line extender at the time it was deployed in the HFC is called a: 2dB

Answer: Question 10 Correct What design map symbol is shown in the diagram? Select one: a. Line Extender b. Optical Node c. Headend transmitter d. Power Supply Started on Monday, May 14, 2018, 10:03 AM State Finished Completed on Monday, May 14, 2018, 10:32 AM Time taken 28 mins 15 secs Grade 80.00 out of a maximum of 100.00 Feedback Congratulations on successfully completing the System Design module test. Question 1 Correct The C/N improves from every 1 dB that is added to the input of the amplifier above the noise figure (F); however, the CTB and XMOD get worse by ___ dB. Answer: Question 2 Correct The difference between the RF carrier and average level of the noise floor is called: Select one: a. carrier to noise Tombstones or Data Boxes 2

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b. bit error rate c. modulation error ratio d. signal to valley Question 3 Correct What design map symbol is shown in the diagram? Select one: a. 4 way directional tap plate b. 2 way directional tap plate c. 8 way directional tap plate d. directional coupler Question 4 Incorrect If the number of identical amplifiers in a cascade is increased from 2 to 4 amplifiers and the original 2 amplifiers produced a total C/N ratio of 51 dB, what would the total C/N ratio be at the end of the 4 amplifier cascade? Select one: a. 49 dB b. 45 dB c. 47 dB d. 48 dB Question 5 Correct According to the diagram, what is the dB gain of amplifiers 1, 2 and 3? Answer: Question 6 Correct True or False: The noise figure (F) is the degradation of the S/N or C/N ratio and the amount of noise that an amplifier will contribute to total system S/N or C/N ratio as the signal passes through the HFC. Select one: 14.5

True False Question 7 Incorrect The difference between the most positive signal amplitude and the most negative signal amplitude levels of an electrical signal such as RF is called: Select one: a. carrier to noise b. wave to floor c. signal to noise d. peak to valley (trough) Question 8 Correct Match the following system maps. as- bui lt Answer 1 str an d Answer 2 des ign Answer 3 Question 9 Correct Strand maps show: (Choose 3) Select one or more: a. tap locations b. trench routes c. strand d. streets maps of the completed and current system plant, show ing any changes or revisions that were made during construction and ongoing operatio maps of the aerial and underground routing of the various cables throughout the system, showing poles, strand, trench routes, footages, and maps of the system as the designer has engineered it. They are the blueprints for constructing the plant.

Question 10 Correct An amplifier tombstone or data block on an RF design map includes which of the following information? (Choose 3) Select one or more: a. Reverse Diplex Filter b. Footage to Previous Amplifier c. Forward Equalizer d. Amplifier Cascade e. DC voltage

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