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Posted by Er. AMIT DWIVEDI , , , ,
Rajiv Gandhi Technical University Bhopal 
Data Communication
B.E. (5th Semester) Examination
Note : Attempt any Five questions.
Q.1.(a)Differentiate between synchronous and asynchronous communication with suitable. ?
       (b)Assuming a synchronous transmission control scheme,explain how character & frame synchronization are achieved :-
  1. with character-oriented transmission
  2. with bit-oriented transmission
Q.2.(a) Explain Shannon-fano encoding and Huffman coding theorem with suitable examples. ?
       (b) a message comprising of different characters which are transmitted over a data link. The relative frequency of occurrence of each character is : A = 0.1, B = 0.25, C = 0.05, D =0.32, E = 0.01, F = 0.07, G =0.2 Derive the entropy of the message and derive the suitable set of code words using Shannon-Fano coding.

 Q.3.(a) Explain under what condition circuit switching is better than packet switching.?
       (b) Derive the following terms as they apply to packet switching routing algorithm : 
  1. Directory
  2. Random
  3. Flooding
Q.4. (a) Explain the various line disciplines used for data transmission between two stations with their timing calculations. Give suitable applications of each.
        (b) Define the following : 
  1. Data rate 
  2. Topology 
  3. Duplexity.
Q.5. (a) Describe a conceptual view of ISDN.
        (b) What are the advantages of digital technology over analog technology ?
        (c) Define Shannon and Nyquist on channel capacity.
        (d) what do you mean by digital access ?

 Q.6. (a) Explain the TCP protocol with their frame structure.Describe each field frame in brief.
         (b) Define the following
  1. Piggybacking 
  2. code converters 
  3. Protocol converters
Q.7. (a) Describe the principle of operation of CDMA/CD in LAN.
        (b) Explain the working of token ringchannel allocation in LAN.

 Q.8. Write short notes on any two of the following :
  1. Multiplexing
  2. RS-449
  3. Data compression
  4. High speed modems 
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