University of Rajasthan 2008 B.C.A Computer Application ELECTRONIC COMMUNICATION AND DATA COMMUNICATION - Question Paper

D
537
B.C.A. (Pt. II)
19-D 219 Pt.II
Bachelor of Computer Applications (Part II)
EXAMINATION, 2008

(Faculty of Science)

(Three-Year Scheme of 10+2+3 Pattern)

Paper 219

ELECTRONIC COMMUNICATION AND DATA COMMUNICATION

Time allowed: 2 hours

Maximum marks: 30

DESCRIPTIVE PART-II

Attempt 4 descriptive kind of ques. out
of six. All ques. carry 7.5 marks every.

1. (a) What is the need of modulation in long distance communication? [Marks 1.5]

(b) What is M-array pulse modulation? define giving suitable examples. [Marks 6]

2. (a) What do you mean by the term redundancy with respect to fault control techniques? [Marks 1.5]

(b) Using Cycling Redundancy Check (CRC) fault detection method, obtain the sequence of redundant bits i.e. CRC for the data unit 100100 when the CRC generator (divisor) used is 1101.
[Marks 6]

3. (a) What is electromagnetic radiation spectrum? Which parts of this spectrum are currently in use for long distance communication?
[Marks 1.5]

(b) What do you mean by the term propagation modes with respect to optical fiber communication? explain and define different propagation modes, used in optical fiber communication. [Marks 6]

4. (a) What is ISDN? List different ISDN channels available for subscriber access to ISDN (List only). [Marks 1.5]

(b) What do you mean by an orbit of a satellite? elaborate Geo-synchronous satellites? explain different advantages and disadvantages of using Geo-synchronous satellites. [Marks 6]

5. (a) What do you mean by digital-to-analog encoding? [Marks 1.5]

(b) define ASK, FSK, PSK and QAM digital-to-analog encoding techniques using suitable bit sequence and diagrams. [Marks 6]

6. Write short notes on the following:

(i) Duo-binary signaling
(ii) PCM waveforms(digital-to-digital encoding)
[Marks 3.5+4]

Earning:   Approval pending.