IT 300 HW 4 | Questions and Answers
2. signal-to-noise ratio (SNR): a representation of the signal intensity compared to the background noise intensity calculated by subtracting the intensity of the noise from the intensity of the signal (in decibels)
SNR represents the ratio of receive power to ...
1. Select the correct statement(s) regarding transmission systems and RFI (radio frequency
interference).: UTP medium relies upon balanced signaling to cancel noise interference
products
2. signal-to-noise ratio (SNR): a representation of the signal intensity compared to the
background noise intensity calculated by subtracting the intensity of the noise from the
intensity of the signal (in decibels)
SNR represents the ratio of receive power to noise floor power
3. the establishment of a successful communications link.
a. signal power received must be of sufficient strength to meet manufacturers receive sensitivity
specifications for the receiver model
b. noise floor is comprised of wideband noise products that directly impacts receive signal strength
c. narrowband noise products that appear sporadically such as lightning or manmade interference,
are not included as part of the noise floor, but are dealt with by adding link margin
d. all statements are correct: d. all statements are correct
4. Although SNR is a unitless ratio, the units of signal power (e.g., mW, W, kW, etc.) must match the
units of noise power, otherwise large calculation errors will occur.
t/f: true
5. Determine the decibel values of thermal noise power (N) and thermal noise power density (No)
given the following: T=292 degrees Kelvin, B = 40MHz. (note: brackets "[ ]" represent decibel values):
b. [N] = -128 dBW, [No] = -204 dBW
6. Determine the decibel values of thermal noise power (N) and thermal noise power density (No)
referenced to 1W given the following: T=300 degrees Kelvin, B = 40MHz.: . [N] = -127.81 dBW, [No]
= -203.83 dBW
7. Given a receive power of 80E-6 mW and a noise power in decibels of [N]=
-125dBm, determine the decibel SNR value.: [SNR] = -40.97 dBm - (-125 dBm)
= +84.03 dB
8. Given a receive power of 7E-5 mW and a noise power in decibels of N= 144E-13 W, determine
the decibel SNR value.: [SNR] = +36.87 dB
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, IT 300 HW 4 | Questions and Answers
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9. Determine the thermal noise power density [No] in decibels and watts, given the following
information: T=291oK, signal bandwidth of 32kHz.: -203.96 dBW,
+4.02E-21 W
10.Given the following information, determine the [SNR] in decibel form: [Pr]
= [S] = -110dBm, T=297oKelvin, B=4 kHz: 27.85 dB
11.When determining the non-decibel value of S/N, mixing units (i.e., mW and W) between S and N is
permissible (e.g., S(mW)/N(W)) since S/N is a unitless ratio.
t/f: false
12.The noise floor, also known as additive white Gaussian noise (AWGN), is a continuous noise
level that appears over a wide spectrum when viewed in the frequency domain.
t/f: true
13. is noise caused when the frequency bandwidth of adjacent channels overlaps
with one another, thus causing distortion on each chan- nel.: Intermodulation noise
14.Select the correct statement(s) regarding the Shannon-Hartley Capacity Theorem.
a. the theorem identifies the theoretical maximum bit rate that is achievable based upon signal
bandwidth and SNR
b. according to the theorem, an increase in signal bandwidth accompanies an increase in bit rate
capacity
c. by increasing signal power, the theorem states that an increase in bit rate can be achieved
d. all of the above are correct statements: d. all of the above are correct state- ments
15.Determine the maximum theoretical data rate possible given a frequency bandwidth of 18MHz,
SNR=99, and M=32.: 119 Mbps
16.For guided mediums, insertion loss is dependent upon which of the follow- ing?
number of connectors and splices
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