Maharashi Dayanand University (MDU) 2010 B.Tech Information Technology (Branch-VI) - Question Paper

B.Tech.3rd Semester info Technology (Branch-VI)
Examination-December,2010
DIGITAL ANALOG COMMUNICATION
Paper:EE-217-F
Time:Three hours] [Maximum marks:100
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Before answering the question, candidate should ensure that they have been supplied the accurate and complete ques. paper. No complaint in the regard, will be entertained after exam.
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Note: Attempt 5 ques..All ques. carry equal marks.
1.(a) Effect of limited Band Width on Digital Signal.Explain. 5
(b) discuss Shannon limit. 5
(c) discuss various Communication nodes. 5
(d) Difference ranging from Secret Key Cryptography and Public Key Cryptography. 5

2.(a)Explain with diagram various components of a communication system. 10
(b)State and discuss different properties of 'Fourier Transform'. 10

3.(a)If f(t)-f(w) is Fourier transform pair obtain the Fourier Transform(F.T) of the following:
(i) f(t)coswot
(ii)f^2(t)
(iii) f(-2t) 10
(b)State and prove Rayleigh's energy theorem. 10

4.(a)Explain the 2 physical layer interfaces i.e.
Rs. 232 and X.21. 10
(b)Explain with diagrams, what is binary encoding (NRZ)Manchester encoding and differential
Manchester encoding. 10

5.(a)Explain 2 various transmission media:
(i) Twisted pair
(ii)Co-axial cables 10

(b)Explain subsequent terms:
(i) Nyquist rate
(ii) Shannon limit 10

6.(a) Differentiate ranging from TDM and WDM. 10
(b) discuss the telephone system 'ISDN'. 10

7.(a) Differeniate ranging from circuit switching and packet switching systems. 10
(b) discuss sliding window protocol in detail. 10

8.(a)Explain Huffman encoding using suitable example. 10
(b)Discuss parity check and the kind of errors it can detect and it cann't detect. 10

9.Explain the following:
(i) Cyclic Redundancy Check 10
(ii) Hamming Codes 10

Earning:   Approval pending.