LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – COMPUTER SCIENCE
FIFTH SEMESTER – APRIL 2011
CS 5506 – INTRODUCTION TO DATA COMMUNICATION
Date : 19-04-2011 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
PART – A
ANSWER ALL THE QUESTIONS: (10 x 2 = 20 marks)
- What are the fundamental characteristics for effectiveness of a data communication?
- Define multipoint network.
- What is meant by peer-to-peer processes?
- Define Frequency.
- What are the five broad categories of line coding schemes?
- Write a note on Bipolar with 8-zero substitution(B8ZS).
- What are the use of twisted –pair cables?
- List out the advantages of Optical Fiber.
- Define Channel.
- What is meant by burst error?
PART – B
ANSWER ALL THE QUESTIONS: (5 x 8=40 marks )
- a) What is the difference between half-duplex and full duplex transmission modes?
(Or)
- b) List out the five components of a data communication system and Explain it.
- a) Discuss about peer-to-peer processes in OSI with necessary figure.
(Or)
- b) Explain the services of the session layer .
- a) Differentiate between Manchester and differential Manchester schemes.
(Or)
b)What are the functions of pins in EIA-232 DB-25?
- a) Write down the specifications of the major Bell Modems.
(Or)
- b) Explain the advantages and disadvantages of optical fiber.
- a) Discuss in detail about the Time-Division Multiplexing.
(Or)
- b) Explain the following types of redundancy checks used in data communication.
- a) Vertical Redundancy Check b) Longitudinal Redundancy Check
PART – C
ANSWER ANY TWO QUESTIONS (2×20=40 marks)
- a) Explain the topologies with an example.
- i) Bus ii) Ring
- b) Discuss in detail about the services offered by Data link layer and Transport layer.
- a) Describe the types of polar encoding used in digital – to – digital conversion.
- b) What are the three types of digital services available to telephone customers?
- a) Explain error correction in detail.
- b) Explain the Types of Computer Networks with Examples.
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