3 Using the network that is being redesigned will certainly speed data

# 3 using the network that is being redesigned will

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3. Using the network that is being redesigned will certainly speed data transfers considerably. President Coone is amazed to see that an email message with a large attachment can be sent in a matter of seconds. He reflects back on the time when data was primarily transmitted via modems: a. Compute each office’s number of bits sent per day (origin to destination) on the basis of the data provided in Case Figure 3–1. Use 10 bits per character to keep computations simple and assume all transmissions are error free. Hint: Bits per day = Packages × 750 × 10×2. Atlanta: 63,150,000 Chicago: 37,800,000 Dallas: 73,500,000 Denver: 17,250,000 Houston: 30,150,000 Jackson: 22,200,000 Jacksonville: 21,150,000 Los Angeles: 11,550,000 Memphis: 28,050,000 Miami: 42,150,000 Montgomery: 6,750,000 New Orleans: 31,800,000 Orlando: 41,250,000 St. Louis: 41,850,000 Tampa: 47,850,000 Washington: 7,350,000 b. How many minutes will it take for each city’s modem to transmit its invoices? Use the bits per day calculated in question 2 and assume that the V.34 modems transmit at an average rate of 28,800 bps. Atlanta: 36.55 Chicago: 21.88 Dallas: 42.53 Denver: 9.98 Houston:17.45 Jackson: 12.67 Jacksonville: 12.24 Los Angeles: 6.68 Memphis: 16.23
Miami: 24.39 Montgomery: 3.91 New Orleans: 18.40 Orlando: 23.87 St. Louis: 8.59 Tampa: 27.69 Washington:4.25 c. Previously, you calculated the transmission time in minutes per day, based on a 28,800-bps modem and 10 bits per character. Now calculate the file transfer time for Atlanta to transmit all of its invoices to Tampa at the end of the workday. Why is this answer different from the time calculated for Atlanta previously? 1906.354/60=18.27 When looking at that time, it is about half of the average. It is half of the average because it is being transmitted twice. It is going to the destination and back to Tampa while this is only being transmitted one time. d. Could all the NDAS offices transmit their invoices to Tampa between 5:00 P.M. and 6:00 P.M. each evening? How would they achieve this goal? With the modem that they currently have they could do this. If you look at the data from the questions above the 28800 modem is to slow. If they would want to achieve their target goa they would have to get a faster modem. 4. Would it be better to transmit all invoice information from the origin to Tampa and for Tampa to send the information to the destination? Why?