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PROGRAM -
BCA(REVISED FALL 2012)
SEMESTER - 3
SUBJECT CODE &
NAME
BCA 3040 – DATA
COMMUNICATION
BK ID - B1644
CREDITS - 4
MAXIMUM MARKS – 60
Q1. What is
Communication System? Briefly explain the important elements of communication
system. [4+6] = 10
Ans: Communication: Basically, communication is the
process of conveying a message from one person to other or from one
place to another place. It is the exchange of ideas, thoughts and
feelings between two persons, places or points.
Communication Systems: Communication System is a system
or facility capable of providing
information transfer between
Q2. What is
modulation? Explain why modulation is required? [5+5] = 10
Ans:
Modulation: Modulation is the process of varying one of characteristics
(either
amplitude or frequency or phase)
of a high-frequency periodic waveform, called the carrier signal,
with a modulating signal which typically contains information to
be transmitted. If we look at a general function for a
Q3. Write a note
on: [5+5] 10
·
Ground Wave Propagation
·
Sky Wave Propagation
Ans:
Ground Wave Propagation: Ground wave propagation follows the curvature of the
Earth. Ground waves have carrier frequencies up to 2 MHz. AM radio is an
example of ground wave propagation. Figure shows the concept of
Q4. Briefly explain
Nyquist theorem with mathematical representation. [10]
Ans:
Nyquist theorem: The Nyquist theorem states that “a
signal must be sampled at least twice as fast as the bandwidth of
the signal to accurately reconstruct the waveform” In other words,
the sampling frequency should be at least twice the highest frequency
contained in the signal. It is mathematically represented
Q5. What is
Channelization? Briefly explain three channelization techniques. [2+8] = 10
Ans:
Channelization: Channelization is a
multiple-access method in which the available
bandwidth of a link is shared in
time, frequency,
Q6. What are the
advantages of packet switching over circuit switching? [10]
Ans:
Packet switching: In
packet switching message is divided into blocks of data called packets.
Each packet is associated with a
header before they are transmitted individually through the network. The path
taken by each packet to reach their respective destination is depending on the
status of links used by switching equipment. The packet-switching network is a
distributed
collection of packet-
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