Assignment No. 02 SEMESTER Fall 2009 CS601- Data Communication Total Marks: 15 Due Date: 13/11/2009 Please read the following instructions carefully before solving & submitting assignment: Due Date: Your assignment must be uploaded/submitted before or on 13th November, 2009. Uploading instructions Please view the Assignment Submission Process document provided to you by the Virtual University for uploading assignments. o Assignment should be in .doc format. o Save your assignment with your ID (e.g. bx020200786.doc). o Assignment submission through email is highly discouraged. o No extended day for submission of the assignment by LMS will be given. Rules for Marking: It should be clear that your assignment will not get any credit if: o The assignment is submitted after due date. o The submitted assignment file is corrupted. o The assignment is copied. Note: Your answer must follow the below given specifications. You will be assigned zero marks if you do not follow these instructions. • Font style: “Times New Roman” • Font color: “Black” • Font size: “12” • Bold for heading only. • Font in Italic is not allowed at all. • No formatting or bullets are allowed to use. For any query about the assignment, contact at cs601@vu.edu.pk GOOD LUCK Marks: 15 Question 1 Why OSI is called Open System? [5 marks] Question 2 Draw the diagram for the signal 011110100 using NRZ-I and NRZ-L encoding schemes? [5+5] NRZ (not return to zero), I (inversion) and L (Level). Note: Use following signal state for first digit encoding as given while remaining part is on you to complete. Lectures Covered: This assignment covers Lecture # 7-14 Deadline Your assignment must be uploaded/submitted at or before 13-11-2009. Amplitude Time NRZ-L Time NRZ-I 0 1 1 1 1 0 1 0 0
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