Homework Assignment 1

Due Sept 17 at Midnight

For each problem create a spread sheet that contains labeled fields for the inputs, and for any important constanst, and then computes the output. Each calculated cell should be labeled both with the name of the value AND the equation used to compute it. (See Example.xls)

1. Suppose that a certain communications protocol involves a per-packet overhead of 50 bytes for headers and framing. We

send 1 million bytes of data using this protocol; however, one data byte is corrupted and the entire packet containing it is thus
lost. Give the total number of overhead + loss bytes for packet data sizes of 1000, 10,000, and 20,000 bytes. Which size is optimal?

2. For the following, assume that no data compression is done, although in practice this would almost never be the case. For (a) to (c), calculate the bandwidth necessary for transmitting in real time:

  • (a) Video at a resolution of 640 480, 3 bytes/pixel, 30 frames/second.
  • (b) Video at a resolution of 160 120, 1 byte/pixel, 5 frames/second.
  • (c) CD-ROM music, assuming one CD holds 75 minutes’ worth and takes 650 MB.
  • (d) Assume a fax transmits an 8 10-inch black-and-white image at a resolution of 72 pixels per inch. How long would this take over a 14.4-kbps modem?
Solutions
Topic attachments
I Attachment Action Size Date Who Comment
Xlsxls Example.xls manage 6.5 K 2015-09-15 - 12:29 JimSkon  
Topic revision: r4 - 2015-10-01 - JimSkon
 
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