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Posted by Er. AMIT DWIVEDI , , , , , ,
R.G.P.V. Bhopal (MP)
B.E. (5th Semester) Examination 
VOICE COMMUNICATION [ EC-501(N) ]
Time:3 Hrs     Max Marks:100     Min Marks:35
Note:- Attempt any five question .All questions carry equal marks.
UNIT-I
Q.1 (a) Draw the block diagram of a telephone system.Also explain the function of standard telephone set?  10
       (b) Explain DTMF and Multi-frequency ? Also differentiate between both?  10
OR
Q.2 (a) Write short notes on: (Any 4)       16
                 (i) Cordless Telephone
                 (ii) Caller ID
                (iii) Electronics Telephone
                (iv) Crosstalk
                 (v) Transmission Level Point, Transmission Level and Data Level Point
       (b) Determine :  04
                (i) The Power level in dBm for signal level of 10 mW and 0.5 mW;
               (ii) The difference between the two power levels in dB .
UNIT-II
Q.3 (a) Write Short notes on : (any 2)   10
                  (i)  Frequency-Division-Multifrequency.
                  (ii)  Time-Division-Multifrequency.
                 (iii) Hierarchy of Switching offices. 
       (b) Describe Arrival Time Distribution and Holding Time Distribution for traffic?10
OR
Q.4 (a) What is Common-Channel-Signaling System-7(SS7)?Also give its network function ? 10
       (b) Write short notes on Loss System ?Describe the three model of loss system?10 
UNIT-III
Q.5 (a)Write down the advantages of digital voice network?  10
       (b) Explain the term quantization? 10
OR
Q.6 (a) Draw the block diagram of  PCM system and explain its working? 10
       (b)What is a Codec and Combo chip?  10  
UNIT-IV
Q.7 (a)Explain Pulse transmission in detail? 10
       (b) Explain synchronous and asynchronous transmission in brief? 10
OR
Q.8 (a)Compare the various asynchronous and synchronous transmission techniques? 10
        (b) What is line coding?give some examples of line codes and explain in brief? 10
UNIT-V
Q.9 (a) Explain Time-Slot-Interchanging(TSI)  and Combinational switching? 10
       (b) Write short notes on:  (Any 2)  10
                  (i) Switching Matrix,
                 (ii) Multi-stage Switching.
                (iii) Digital-Cross-Connect system(DCS)
Q.10 (a) Explain Step-By-Step Switching?  10
         (b) Write down the concept of TDM ? 10

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