hw18 _________ is noise caused when the frequency bandwidth of adjacent channels

Question

hw18

_________ is noise caused when the frequency bandwidth of adjacent channels overlap with one another, thus causing distortion on each channel.

a. Thermal noise

b. Intermodulation noise

c. Cochannel interference

d. Impulse noise

hw19

A receive system temperature is found to be 290 Kelvin over a frequency bandwidth of 4000 Hz. Determine the thermal noise in decibels.

a. -137.96 dBW

b. 167.96 dBW 4

c. -167.96 dBW

d. 137.96 dBW

hw20

Determine the SNR in decibels given a receive signal of 10E-6 watts, and [N]=-128 dBW.

a. 128dB

b. 48.41 dB

c. 78.41 dB

d. -98.41dB

hw21

Determine the maximum theoretical data rate possible given a frequency bandwidth of 36 MHz and SNR=100.

a. 36 Mbps

b. 100 Mbps

c. 72E6 bps

d. 240 Mbps

hw22

A BER (bit error rate) of 1E-5 means that the probability of experiencing a bit error is one bit for every 100,000 bits sent.

a. True

b. False

hw23

Select the way(s) in which the data rate capacity of a link can be increased.

a. Increase the number of levels (M) allowed per symbol

b. Increase signal frequency

c. Increase frequency bandwidth

d. All of the above hw24

Select the correct statement(s) regarding carrier and signal frequencies.

a. increasing frequency increase data rate capacity

b. increasing frequency bandwidth increases data capacity

c. increasing frequency increases signal attenuation

d. All of the above are correct statements

hw25

For guided conductive mediums such as UTP (unshielded twisted pair) and coaxial cable, thicker conductors (i.e., lower AWG numbers) result in higher data rate capacities being supported.

a. True

b. False

hw26

Select the correct statement(s) regarding UTP.

a. UTP signals are balanced, meaning that one wire transmits the signal, while the other wire is connected to ground 5

b. All UTP wire pairs within a cable (e.g., Cat 5e) are twisted at exactly the same twist ratio

c. UTP signals are balance, which means that each wire within a pair carries the same signal, but with opposite polarities

d. Crosstalk is never a problem with UTP

hw27

Coaxial conductors use unbalanced signals, which means that it is less capable than UTP balanced conductors with regards to data rate capacity and attenuation.

a. True

b. False

hw28

Select the correct statement(s) regarding fiber optic cable.

a. The core and cladding within a fiber optic cable must have the same refractive index in order to achieve TIR (Total Internal Reflection)

b. Only single mode fiber (SMF) can be constructed with either a “step” or “graded index” core

c. Mulimode optical fibers (MMF) are vulnerable to modal dispersion

d. All statements are correct

hw29 When considering the quality of laser light sources, a narrower spectral width is preferred.

a. True

b. False

hw30 Select the difference(s) between optical LED and LD light sources.

a. LED light sources are slower than LDs

b. LEDs produce incoherent light, compared to LDs which produce coherent light

c. LDs have a more narrow spectral width compared to LEDs

d. All of the above are differences between LEDs and LDs

hw31

APD (Avalanche Photo Diode) light detectors amplify optical signals during the optical-to-electron (OEO) conversion. PIN (Positive Intrinsic Negative) light detectors do not amplify the optical signal during the OEO process.

a. True

b. False

hw32

The use of optical amplifiers, such as the EDFA (Erbium-Doped Fiber Amplifier) and Raman Amplification, do not require conversion from optical to electrical signals during the amplification process.

a. True

b. False 6

hw33

Optical amplifiers and switches do not require conversion between optical and electrical signals (i.e., OEO process).

a. True

b. False

hw34

Signal reflection within an unguided medium such as the atmosphere is never beneficial for signal transmission.

a. True b. False

hw35

________ describes the bending of a signal wave caused by changes in the refractive index of the unguided medium.

a. Reflection

b. Refraction

c. Absorption

d. Scattering

Explanation / Answer

35. The answer is C. the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density is called refraction.

34. The answer is True. Because due to reflection in unguided media in atmosphere signal may be lost energy with which it carries. So this results in loss of information from it.

I just answered what I know. If any queries comment plz..

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