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Data Communication CS601 - Assignment No. 02 Solution and discussion Semester: Fall 2013 Due Date: 6/12/2013

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Question 1:   (10 Marks)

You are required to represent the data stream 1001101001 using the following encoding schemes on different graphs separately.

• NRZ-L
• NRZ-I

Question 2:   (5 Marks)

a) A periodic signal has a bandwidth of 700 Hz and its lowest frequency is 200 Hz; find out its highest frequency with all necessary steps.

b) Consider the following sine wave, and calculate its time period and frequency.

Question 3:   (5 Marks)

Suppose a message travels from device A to B in OSI model. Headers and trailers are added to the message before it reaches the destination B. Considering the given scenario, you are required to identify:

• The sequence of OSI layers in which headers and trailers are added at device A.
• The sequence of OSI layers in which headers and trailers are removed at device B.

NOTE: Every student should provide his/her own work, exact copying of the assignment (or some portion of the assignment) from the internet or other students will lead to copy case and zero marks will be awarded. Do not put any query on MDB about this assignment, if you have any query then email at cs601@vu.edu.pk.

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