Question

QUESTION 9

1. Determine the maximum theoretical data rate possible given a frequency bandwidth of 4 kHz and SNR=99 dB.

   		a. 26 kbps
   		b. 100 kbps
   		c. 72E6 bps
   		d. 240 Mbps

10 points   

QUESTION 10

1. For guided mediums, insertion loss is dependent upon which of the following?

   		a. number of connectors and splices
   		b. wire diameter
   		c.   signal frequency
   		d. all of the above

10 points   

QUESTION 11

1. Signals on UTP guided medium are in a balanced configuration, which is how it handles RF noise. This differs from coaxial cables, which are in an unbalanced configuration.

   True

   False

10 points   

QUESTION 12

1. Select the correct statement(s) regarding UTP guided medium.

   		a. each UTP pair within a bundle (e.g., Cat5e) has a different twist ratio; thus causing delay skew
   		b. UTP cables use balanced signaling to handle external noise products
   		c. UTP wire diameters are smaller than typical coaxial cables. As such, the data capacity supported by a UTP cable is much less than with a coaxial cable.
   		d. all statements are correct

10 points   

QUESTION 13

1. What are ways to increase the data capacity within an UTP cable?

   		a. increase the diameter of the wires within the UTP cables
   		b. place RF shielding around each twisted pair and/or around the entire cable bundle
   		c. both a and b
   		d. neither a nor b

10 points   

QUESTION 14

1. Communications conducted over UTP pair or pairs, can operate in a full-duplex, half-duplex, or simplex manner.

   True

   False

10 points   

QUESTION 15

1. How do coaxial cables prevent RF interference?

   		a. by adopting a balanced signal configuration
   		b. by use of a properly grounded conductive shielding surrounding the signal wire
   		c. by implementing noise cancellation techniques
   		d. all of the above

10 points   

QUESTION 16

1. Due to the poor quality and high costs of coaxial cables, UTP is typically selected over coaxial cables when large data capacity is required in a noisy environment.

   True

   False

Answer 1

9) a) 26kbps

10) d) all of the above

11) True

12) d)

13 c)

14) True

15) a)

16) True

-----------explanation-------------

9) for a noisy channel, Capacity = bandwidth * log2(1 + SNR). plugging values will give 26kbps

10) no explanation needed.

11) in UTP, all the wires use the same type of medium, hence it is balanced, while it is not true for coaxial

12) all options are factual, hence no explanation needed.

13) from the formula given in (9), the capacity depends upon noise and the bandwidth. Increasing the diameter will increase the bandwidth and reducing the noise will also increase the SNR.

14) no explanation needed.

15) balanced configuration is less prone to noise

16) coaxial is extremely prone to noise, hence it should be avoided in a noisy environment.