# What is the main difference between Packet switching Virtual Circuit and CircuitSwitching?

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Assignment No 11. Using the layer models in Figure, describe the ordering and delivery of a pizza, indicatingthe interactions at each level.Figure 12. The French and Chinese prime ministers need to come to an agreement by telephone,but neither speaks the other’s language. Further, neither has on hand a translator thatcan translate to the language of the other. However, both prime ministers have Englishtranslators on their staffs. Draw a diagram similar to Figure 1 to depict the situation, anddescribe the interaction and each level.3. From the following figures, compute the maximum amplitude, frequency, time periodand phase for each of the wave. The x-axis represents the time in sec and y-axisrepresents the amplitude.4. Compute the amplitude, frequency, time period and phase for each of the followingequations and also draw their respective waveforms.a. 10??????(2??(100)??)b. 20??????(2??(30)?? + 90)c. 5??????(500???? + 180)d. 8??????(400???? + 270)5. Suppose that a digitized TV picture is to be transmitted from a source that uses a matrixof 480× 500 picture elements (pixels), where each pixel can take on one of 32 intensityvalues. Assume that 30 pictures are sent per second. (This digital source is roughlyequivalent to broadcast TV standards that have been adopted.).a. Find the source rate R (bps).b. Assume that the TV picture is to be transmitted over a channel with 4.5-MHzbandwidth and a 35-dB signal-to-noise ratio. Find the capacity of the channel(bps).Hint: Use Shannon’s Criteria.6. Determine the isotropic free space loss at 4 GHz for the shortest path to a synchronoussatellite from earth (35,863 km).7. Given a signal as follows, compute the fundamental frequency, spectrum andbandwidth. Also calculate the channel capacity using Nyquest criteria using M= 2, 4, 8,where M is the number of levels.??(??) = 5 sin(200????) + sin(600????)8. Explain how the data rate over a channel can be increased, without increasing thebandwidth? What is the disadvantage of this approach?Hint: Nyquist Theorem9. What is the main difference between Packet switching Virtual Circuit and CircuitSwitching? Also discuss the advantages of Packet switching Virtual Circuit over CircuitSwitching.10. In a LOS communication, consider d = 40km, the requirement is to make two antennas(transmitter and receiver) such that the height of one antenna should be twice of theother. Considering this, find the appropriate heights of these two antennas.

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