Rar05321701-data-and-computer-communications-set1

RA

Code No: RAR05321701

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 DATA AND COMPUTER COMMUNICATIONS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Discuss in details the significant transmission impairment. (b) What is the channel capacity of a teleprinter channel with a 300 MHz Bandwidth and a signal to noise ratio of 3dB. [8+8] 2. (a) Explain how analog data is digitized with diagram. (b) Discuss Angle modulation.

[8+8]

3. Write short notes on: (a) Characteristics of TCP (b) Comparison between synchronous TDM and statistical TDM.

[8+8]

4. (a) What is Multiplexing? Explain the importance of Multiplexing? (b) Explain the characteristics of FDM.

[8+8]

5. Would it be possible to provide a Circuit switched rather than a packet switched implementation of SS7? What would be the relative merits of such an approach? [16] 6. (a) Distinguish between the active tap and passive tap categories of optical fibre taps followed in bus LANs. (b) What is meant by timing jitter in ring LANs?

[10+6]

7. (a) Distinguish between N-ISDN and B-ISDN. (b) What are the various B-ISDN access methods and compare them? (c) What are the various functions of ISDN physical layer?

[6+5+5]

8. (a) List different approaches for frame relay congestion control. (b) What is commited information rate (CIR)? What is its significance in congestion control? [6+10] ?????

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