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PROGRAM
BCA
SEMESTER - 3
SUBJECT CODE &
NAME
BCA 3040 – DATA
COMMUNICATION
BK ID - B1644
CREDITS - 4
MAXIMUM MARKS – 60
Q1. Draw the block
diagram of communication system and briefly explain about each block. 10
Answer:
Block Diagram of Communication System: This section explains to you the
functions of various blocks of communication system block diagram. The
basic or the general block diagram of a communication system is as shown
in
Q2. Briefly explain
the communication channel with an example. 10
Answer:
Communication channel: Communication channel means a
medium through which electrical signals can be transmitted. A communication
channel (or simply channel), refers either to a physical
transmission medium such as a wire, or to a logical connection over a multiplexed
medium such as a radio channel. A channel is used to convey an
information signal, for example a digital bit stream, from one or
several
Q3. What is
modulation? Explain why modulation is required? 10
Answer:
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
Q4. What is Coaxial
cable? Briefly explain the structure of Coaxial cable with a supported diagram.
10
Answer:
Coaxial cable: Coaxial cable has traditionally
been an important part of the long distance telephone network. Using
frequency-division multiplexing (FDM), a coaxial cable can carry over
10,000 voice channels simultaneously. Coaxial Cable consists of 2
conductors. The inner conductor is held inside an insulator with the
other conductor woven around it providing a shield. An insulating
protective coating called a jack
Q5.
Briefly explain Nyquist theorem with mathematical representation. 10
Answer:
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
Q6. What are the
advantages of packet switching over circuit switching? 10
Answer:
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. In
circuitswitching networks,
Get fully solved assignment. Buy online from website
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125/subject and rs 625/semester only.
if urgent then call us on 08791490301, 08273413412
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