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# Assignment No 3 Data communication (CS601) Solution and Discussion Spring 2014 Due Date: July 14, 2014

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Assignment

Question 1: (5 Marks)
When a signal travels from source to destination, it may b affected by different external factors that cause the loss of energy, due to which the signal may differs from its actual shape. In the given table you are required to identify the type of noise with respect to noise source.

Noise Source                                                             Noise Type

Telephone Wire
Water Pump
Earthquake
Extra Signal generated by Motion of Electron
Grinder

Question 2: (5 Marks)
Suppose a signal is generated from a source with initial power of 1000W but due to attenuation it is received at destination (80 Km away from source) with power of 100W. Find the total power loss in decibels by writing formula with all calculation steps.

Question 3: (5 Marks)
Suppose you need to have simultaneous transmission of signals through a single medium, then which technique will be used to fulfill this requirement? Also describe, how does that technique work at sender and receiver end?

NOTE: Do not put any query on MDB about this assignment, if you have any query then email at cs601@vu.edu.pk.

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### Replies to This Discussion

bewakoof dost se akalmand dushman behtar he

wo dost lagta ha pagal ha

dekh lia

• L(dB) = P power source (dB) -P power receive(dB)
• Here L is light power lose P(dB) = 10*log(power/1kW)
• P power source(dBk)=10*log(1/1) = 100dBk
• P power receive(dB)=10*log(0.1/1) = 12.5Dk
• L = 100dBk-12.5dBk=87.5dBk

yahan se explain akr den plz

yahan se kuch smj ni aaya

10 log or power ki value kahan se aaa gai???

yahan tu minus ho rha tha formula me  = me ap ne multiply kar dia

plz thora explain kar den

yahan

• attenuation= 10log10(100/1000)= 10(-1) = -10db

ap ne galt solve ki hoi yahan 10(-1) ni balke 10 (.1) aati hy or minus kahan se aaya ye b bta den plz

yr log (0.1)=-1

yes its true log(.1)=-1 he hai 10db tk solution thek hai but agy kesy kerna hai.and some solution about Q3 please

Q 1:

Telephone Wire  = crosstalk

Water Pump = induced

Earthquake

Extra Signal generated by Motion of Electron   = thermal

Grinder  = impulse

please tell me am i ryt bcz according to lectures i think its ryt ....

Q3 KA ANS KIA HY

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