# www.vustudents.ning.com

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Question:                                                                                                                                   Marks 15

Question. 1                                                                                                                      (5 Marks)

Consider an extremely noisy channel in which the value of the signal-to-noise ratio is 2000 and bandwidth is equal to 6000 Hz. Calculate channel capacity, according to Shannon Capacity formula. Provide your answer with full calculation, correct formula and correct units.

 Formula Calculation Unit

Question. 2                                                                                                                        (5 Marks)

Suppose a signal travels through a transmission medium with initial power 1000dB but due to some impairments it is received at the destination (about 100 Km away from the source) with power 10dB. You are required to calculate the total power loss, by following all steps in the formula with the correct unit.

 Formula Calculation Unit

Question. 3                                                                                                                         (5 Marks)

Assume a well reputable company that manufactures the electronic equipments, wants to establish a small and reliable network of 40 computers for communication with each other. According to you, which transmission medium between STP and UTP will be preferred and why? Justify your answer with solid reason.

Q1

 Formula Calculation Unit C = B log2 (1 + S/N) Bandwidth is 3 KHz S/N ratio is 3162 C = B log2 (1 + S/N) C = 6000 log2 (1 + 2000) C = 65.799 bps

Q2

 Formula Calculation Unit dB = 10 log10 (P2/P1) P1 is Intial Power P2 is Final Power dB = 10 log10 (P2/P1) dB = 10 log10 (100/1000) dB= -10 dB

isnt the answer suppose to be -20 as p2 is 10 not 100

I don't think that answer of first question would come out in decimal point (C = 65.799) It is straight 65,799 bps I also want you to emphasis  on its unit which is bps so ....

i was 65,799

what is 3162? in first question? I didn't  get the point of 3162. you are saying 1+S/N in formula you are also defining S/N= 3162 and again in formula you are putting 2000 instead of 3162... please elaborate it I really didn't get the point.

3162 just FOR EXAMPLE in handout not relate to this question

Bro why we treat p2 is -20 cause its mention in question is 100db?? So can u explain for my confusion

Suppose a signal travels through a transmission medium with initial power 1000dB but due to some impairments it is received at the destination (about 100 Km away from the source) with power 10dB. You are required to calculate the total power loss, by following all steps in the formula with the correct unit

so p2 is 10dB not 100dB

oops little mistake by the thanks :) (Y)