CS601 Data Communication Assignment No.4 Solution Fall Semester 2013

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CS601 Data Communication Assignment No.4 Solution Fall Semester 2013



Assignment No. 4
Semester Fall 2012
Data Communication - CS601
Total Marks: 30
Due Date: 29-01-2013
Objective: Understanding the T & E lines and Error detection method.
Instructions:
Please read the following instructions carefully before solving & submitting assignment:

Assignment should be in your own wordings not copied from net, handouts or books.

It should be clear that your assignment will not get any credit (marks) if:
The assignment is submitted after due date.
The submitted assignment does not open or file is corrupt.
The assignment is copied (from other student or copied from handouts or internet).
For any query about the assignment, contact at
GOOD LUCK

Q. 1. Telephone Companies use a hierarchy of Digital Signals Service (DS) which have different levels as DS-0, DS-1, DS-2, DS-3 and DS-4. All these levels have different data rates and are implemented through different types of T lines (from T-1 to T-4) or E lines (from E-1 to E-4) on the basis of data rate in each level.
Now you are required to fill the columns of the given table according to following instructions:
Calculate the corresponding data rate against each number of given voice channels.
Write the best suitable type of line (form T-1 to T-4 or from E-1 to E-4 line) with total number of T or E lines corresponding to calculated data rate. [15 Marks]

Note: Type of line (form T-1 to T-4 or from E-1 to E-4 line) and total number of T or E lines must be selected on the basis of calculated data rate having minimum wastage of capacity of the line. Only optimal solution is required for these columns.
No. of Voice Channels

Data Rate in Mbps

Type of T/E line used

Total No. of T/E lines

50

90

140

195

600

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Q. 2. Using Modulo-2 Division and Polynomial x4 + x3 + x + 1, perform the complete process of Cyclic Redundancy Check (CRC) on the given message by writing all steps for both sender and receiver end.

Assume that the message has been received by the receiver without any error. [15 Marks]