North Maharashtra University 2009 B.E Computer Science and Engineering DATA COMMUNICATION, S.E/ - Question Paper
DATA COMMUNICATION NOV - DEC 2009
Tlm* :Thr* Hour*_ &o._Mix. Mirk; 100
Instruction* to Csndidstta:
1. Do not write anything on question paper except Seat No
2. Anawenheet should be written with blue ink only Graph or dttgram should be drawn with the same pen being ueed for writing paper or black MB
pencil.
3. Student should note, no supplement will be provided
4 Attempt any two questions from each unit
5. Figure* to the right indicate fuUmailu
0 Draw neat diagrams whenever necessary 7. Assume suitable data if required
UNIT-I
1. a) Define following with example 10
0 Throughput
* II) Propagation speed.
Ill) Wavelength
Iv) Transmission impairment
v) Propagation time.
b) 0 A signal of 100w power, going into the channel wtth notae of 10w In
order to send 10.000 bttW sec How much Bandwidth needed 7 I
U) What are different types of signala used m data communication 7
Compare them. f
c) Explain with diagram 081 reference model 10
UNIT. II
2. ) Whet is sampling 7 State and explain Nyquist * theorem 10
to) Whal af* different digital modulation techniques 7 Explain any one in detail. 10
I
6
Ii) Define with comparison of bit rat* and band rata.
UNIT. Ill
a. a) Define twitching ? Compare different twitching technique*
10
10
10
b) Explain with neat diagram FDM
c) Explain the following with neat diagram
i) Time alot and frame*.
P
ii) Interleaving
UNIT - IV
4. a) 0 Calculate CRC check *um for the mtetaot pohrnomtal Gd)-**-*3
with generator polynomial. P(x)x3-fx2*1
il) Explain CRC and check um *
b) What do you mean by ftow control ? What are technique* ueed tor flow control ? Explain any one in detail
c) What are the different type* of error* ? How error ocrrecdon can be done 7 10
UNIT-V
10
f. a) What do you mean by control ecce** ? Explein FDMA m detail
b) Explain CSMA/CD with neat diegram
Cf vVhat are different network connect** dev.ce. u*ed ? Slate functoon of eedv 10
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| Earning: Approval pending. |
