LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

NA 08

   B.Sc. DEGREE EXAMINATION – COMPUTER SCIENCE

FIFTH SEMESTER – November 2008

CS 5506 – INTRODUCTION TO DATA COMMUNICATION

 

 

 

Date : 07-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

Answer all the questions.                                                      (2 x 10 = 20 marks)

 

1. Define Topology.
2. What is a network?
3. List the various protocol standards.
4. List the OSI layers.
5. What is analog and digital signal?
6. What is encoding?
7. Define interface.
8. What is modem?
9. Write down the Transmission characteristics of coaxial cable.
10. Write down the components of Telephone system.

 

PART – B

Answer all the questions.                                                      (5 x 8 = 40 marks)

 

11. (a) Explain about the categories of networks.

(or)

(b) Discuss about standards of organization.

12. (a) Explain the various Digital signal encoding formats with neat diagrams.

(or)

(b) With an aid of a diagram explain the difference between phase modulation and frequency

modulation.

13. (a) Describe in detail DTE-DCE interface.

(or)

(b) Describe about digital transmission of data.

14. (a) List and explain the categories of guided medium and discuss the merits and demerits of

each.

(or)

(b) Explain about the MODEM standards.

15. (a) Explain in detail about Hamming Code in error correction.

(or)

(b) Explain CRC for error detection.

PART – C

Answer any TWO.                                                                (2 x 20 = 40 marks)

 

16. (a) Discuss about line configuration.

(b) Explain the functionalities of network layer

17. (a) Explain encoding techniques in Transmission.

(b) Differentiate periodic and aperiodic signals.

18. (a) Explain the types of multiplexing

(b) What are the types of errors and specify the techniques to identify those errors.

 

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