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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
Why is received signal not as same as transmitted signal? Explain
in
brief.
ANSWER
- When a signal is transmitted over a
communication channel, it is subjected to different types of impairments
because of imperfect characteristics of the channel. As a consequence, the
received and the transmitted signals are not the same. Outcome of the impairments
are manifested in two different ways in analog and digital signals. These
impairments
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 sinusoid
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 What is Guided Transmission Media? List different types of
guided media.
Answer –
Transmission media is the physical path
between the transmitter and receiver. Physical media used for the actual data
transmission are grouped into two groups. They are:
a)
Q5 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-switching
nodes. The long-haul circuit-switching telecommunications network was
originally designed to handle voice traffic, and the majority of traffic on
these networks continues to be voice.
Answer
- Congestion control is
concerned with controlling traffic entry into a
network, so as to avoid congestive collapse by attempting to avoid
oversubscription of any of the processing or link capabilities of
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