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Reg No.:_. Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EX AMINATION(S), MAY 2019
Course Code: CS 307
Course Name: DATA COMMUNICATION

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries3 marks. Marks
1 Describe simplex, half-duplex and full-duplex transmission modes (3)

with suitable examples.

2 Identify the significance of Nyquist bandwidth and Shannon capacity (3)
formula in determining the performance ofcommunication in a
network.

3 Discuss time domain and frequency domain concept of a signal. Draw (3)

the frequency domain plot of a periodic signal.

4 How the twisting affects performance in twisted pair cable 7 (3)
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PART B
Answer any two full questions, each carries9 marks.
5 a) What are the various transmission impairments and explain how they (9)
affect performance of a communication link?
6 a) Define Channel Capacity. Calculate the appropriate bit rate and signal (5)

levels for a channel with 100 Mhz bandwidth and SNR of 255.
b) Compare terrestrial and satellite microwave transmission. (4)
7 a) Explain the working principle of parabolic reflective antenna with (5)
suitable diagrams.

b) Fora parabolic reflective antenna with a diameter of 4 m, (4)
operating at 13 GHz, what is the effective area and theantenna gain?
PART ட்‌
Answer all questions, each carries3 marks.

8 Name any two line coding schemes which provide self- (3)
synchronization. Explain with reasoning. Draw the pattern for any one
of such scheme for the following data: 10101111.

9 Explain how Statistical TDM utilizes channel bandwidth better than (3)
Synchronous TDM.

10 How interference is avoided in frequency division multiplexing? (3)

Explain with suitable figures.

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