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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
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Assignment
PROGRAM BCA(REVISED FALL 2012)
SEMESTER 3
SUBJECT CODE & NAME BCA 3040– DATA COMMUNICATION
CREDIT 4
BK ID B1644
MAX.MARKS 60
Q.1 Draw the block diagram of communication system and briefly explain each block.
Answer: Communication is a process to exchange your ideas between two objects. There are
number of factors used in block diagram are Transmitter, Encoder, Noisy Channel, Decoder etc
Transmitter: Transmitter is the first component in this block diagram. Using this system we can
generate the messages which are to be sent through this system.
Encoder: Encoderis the secondelementinthe communication system. It performs the encoding of
the given data, which means that this system converts the messages in the form of symbols for
transmissionpurpose.Inthissystem,asequence of charactersare created in a special format for an
effective transmission. This encoding system is used fo
Q2. Briefly explain the communication channel with an example.
Answer:A medium through which a message is transmitted to its intended audience, such as print
media or broadcast (electronic) media.

2. CommunicationChannels:Inan organization,information flows forward, backwards and sideways.
This flow of information is called communication. Communication channels refer to the way this
information flows within the organization.
In this web known as communication, a manager
Q3. What is modulation? Explain why modulation is required.
Answer:Modulationisthe additionof informationtoan electronic or optical carrier signal. A carrier
signal isone witha steadywaveform -- constantheight(amplitude) and frequency. Information can
be addedto the carrier by varyingitsamplitude,frequency,phase, polarization (for optical signals),
and even quantum-level phenomena like spin. Modulation is usually applied to electromagnetic
signals -- radio, lasers/optics and computer networks. Modulation can even be applied to direct
current (which can be treated as a degenerate carrier wave with amplitude 0 and frequency 0)
mainly by turning it on and off (as in Morse
Q4. What isCoaxial cable?Briefly explain the structure of Coaxial cable with a supported diagram.
Answer: Coaxial cables are the guided media that carnes the signal of higher frequency range
compared to twisted pair cable. Coaxial cables are also called coax. (short form). Two types of
coaxial cables are widely used: 50 ohm cable and 75 ohm cable. 50 ohm cable is used for digital
transmission and 75 ohm cable is used for analog
Q5. Briefly explain Nyquist theorem with mathematical representation.
Answer: The Nyquist–Shannon sampling theorem, which has been named after Harry Nyquist and
Claude Shannon, is a fundamental result in the field of information theory, in particular
telecommunications and signal processing. Sampling is the process of converting a signal (for
example, a function of continuous time or space) into a numeric sequence (a function of discrete
time or space). Shannon's version of the theorem states:[1]
If a functionx(t) containsnofrequencies higher than B hertz, it is completely determined by givi ng
its ordinates at a series of points spaced 1/(2B)
Q. 6 What are the advantages of packet switching over the circuit switching?
Answer: TCP/IPnetworksroute databetweenhostsin packets and packets and packets from many
hosts are interspersed on a link, This is called packet switching.

3. Packetswitchingcanbe contrastedto circuitswitchinginwhichacircuit isexclusivelydedicated to a
sessionforitsduration.The telephone networkisafamiliarexample of circuitswitching.A dedicated
physical circuit is established between two points from the time a call begins until it ends.
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