CS601 Data Communication Assignment No. 03 SEMESTER Fall December 2011

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Assignment No. 03 SEMESTER Fall 2011

CS601- Data Communication
Total Marks: 15

Due Date: 29/12/2011

Instructions

Please read the following instructions carefully before solving & submitting assignment:

It should be clear that your assignment will not get any credit (zero marks) if:

• The assignment is submitted after due date.

• The submitted assignment does not open or file corrupt.

• The assignment is copied (from other student or ditto copy from handouts or internet).

• Student ID is not mentioned in the assignment File or name of file is other than student ID.


Question 1: [5]

Suppose data is sent from user A to B which has been passed through several intermediate nodes. Give your recommendation based on the cases mentioned below:

a. If there are three nodes between A & B then which layer will be responsible for node to node delivery?

b. Which layer will be responsible for Line coding?

Question 2: [5]

Calculate the baud rate and corresponding bit rate for a telephone line having QAM-16 and bandwidth 2400HZ?

Question 3: [5]

Horizon Electronics Company has a small network of 30 computers for communication with each other, which transmission medium among STP and UTP will be preferred and why? Justify your answer with solid reasons at least five points.

Lectures Covered: This assignment covers Lecture # 22-27

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Solution:

Assignment # 3

CS601 – Data Communication

Question# 1:-

Suppose data is sent from user A to B which has been passed through several intermediate nodes. Give your recommendation based on the cases mentioned below:

If there are three nodes between A & B then which layer will be responsible for node to node delivery?
Which layer will be responsible for Line coding?

Answer:-

Layer 3
Layer 1



Question# 2:-

Calculate the baud rate and corresponding bit rate for a telephone line having QAM-16 and bandwidth 2400HZ?

Answer:-

Baud Rate = 2400

For QAM 16 bit rate is 4N

Bit rate = 2400 * 4 = 9600b/s



Question# 3:-

Horizon Electronics Company has a small network of 30 computers for communication with each other, which transmission medium among STP and UTP will be preferred and why? Justify your answer with solid reasons at least five points.

Answer:-

STP stands for shielded twisted pair. When you look inside a networking cable there are six different wires are “paired” and these pairs are twisted. The purpose of this is to prevent something known as cross talk. Cross talk is where the signal along the wire experiences an electromagnetic interference induced by Eddie currents by twisting the tow wires this phenomena, is cancelled out and the data can then be transmitted without interference.