BCA 3040 – DATA COMMUNICATION

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FALL 2015, ASSIGNMENT

PROGRAM	BCA(REVISED FALL 2012)
SEMESTER	3
SUBJECT CODE & NAME	BCA 3040 – DATA COMMUNICATION
BK ID	B1644
CREDITS	4
MAXIMUM MARKS	60

ANSWER ALL THE QUESTIONS

Question.1. What is Communication System? Briefly explain the importantelements of communication system.

Answer:In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole. The components of a communications system serve a common purpose, are technically compatible, use common procedures, respond to controls, and operate in union. Telecommunications is a method of communication (e.g., for sports broadcasting, mass media, journalism, etc.). A communications subsystem is a functional unit or operational assembly that is smaller than the larger assembly under consideration...

Question.2. What is modulation? Explain why modulation is required?

Answer: Modulation is a term that is going to be used very frequently in this book. So much in fact, that we could almost have renamed this book "Principals of Modulation", without having to delete too many chapters. So, the logical question arises: What exactly is modulation?

Modulation is a process of mixing a signal with a sinusoid to produce a new signal. This new signal, conceivably, will have certain benefits over an un-modulated signal.

Question.3. Write a note on:

1. Ground Wave Propagation

Answer:Ground Wave propagation is a method of radio frequency propagation that uses the area between the surface of the earth and the ionosphere for transmission. The ground wave can propagate a considerable distance over the earth's surface particularly in the low frequency and medium frequency portion of the radio spectrum.

A radio wave can leave the antenna in a

2. Sky Wave Propagation

Answer:Sky wave propagation: The sky waves have frequency range between 2MHz to 30MHz. These radio waves have the ability to pass through earth’s atmosphere. The ionosphere of our earth reflects these rays very efficiently. When these rays move along the atmosphere then their movement is from transmitter towards the receiver antenna. This is called as sky wave propagation of the waves. In the above figure, b is the name assigned to the path of the sky wave propagation. These waves can have medium as well as high

Question.4. 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:

If a function x(t) contains no frequencies

Question.6. What are the advantages of packet switching over circuitswitching?

Answer:TCP/IP networks route data between hosts in packets and packets and packets from many hosts are interspersed on a link, This is called packet switching.

Packet switching can be contrasted to circuit

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