D 06000CS307122001 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Course Code: CS307
Course Name: DATA COMMUNICATION

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 3 marks. Marks
1 Consider a noiseless channel with a bandwidth of 3000 Hz transmitting a signal (3)

with two signal levels. Calculate the maximum bit rate.

2 What are the important characteristics of a periodic analog signal? If a periodic (3)
signal is decomposed into five sine waves with frequencies of 250, 300, 600, 700,
and 950 Hz, what is its bandwidth?

What are the advantages of optical fibre communication? (3)
4 Explain Line of Sight propagation with sufficient diagram. (3)
PART छ
Answer any two full questions, each carries 9 marks.
5 9) _ Determine the maximum data rate for a channel having a bandwidth of 2MHz if (6)

1) SNRgg is 0 dB
ii) SNRag 15 1008

b) How can we say that a signal is periodic or non-periodic if its frequency domain (3)
plot is given?

6 ച Explain the various transmission impairments that can affect a communication (6)

system.
b) What is the function of twisting in a twisted pair cable? (3)
7 ഒ) Explain terrestrial microwave and satellite microwave transmission. (6)

b) An ideal isotropic antenna is propagating microwave signals at a frequency of 500 (3)
MHz. Calculate the free space loss in dB if the receiving antenna is located 20 km
away from the transmitting antenna.
PART C
Answer all questions, each carries 3 marks.
8 We have an available bandwidth of 100 kHz which spans from 200 to 300 kHz. (3)
What are the carrier frequency and the bit rate if we modulated our data by using

ASK with d =1?

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