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Exam 3: Data Transmission

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Question 21

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Thermal noise is also referred to as ________ noise.

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Question 22

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A reduction in strength is ________.

A) delay distortion
B) attenuation
C) pulsing
D) interlacing

E) B) and D)
F) B) and C)

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Question 23

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Only digital signals can be used to convey information in the communications environment.

An example of digital data is ________ or character strings.

The advantages of digital signaling are that it is generally cheaper than analog signaling and is less susceptible to noise interference.

The ________ of a signal is the distance occupied by a single cycle.

Twisted pair,coaxial cable and optical fiber are examples of ________ media.

There is not a direct relationship between data rate and bandwidth.

The ________ of a signal is the range of frequencies that it contains.

A familiar example of analog data is audio,which,in the form of acoustic sound waves,can be perceived directly by human beings.

The greater the bandwidth of the signal the greater its information carrying capacity.

The sine wave is the fundamental aperiodic signal.

________ noise is due to thermal agitation of electrons.It is present in all electronic devices and transmission media and is a function of temperature.

When signals at different frequencies share the same transmission medium the result may be ________ noise.

A major problem in designing a communications facility is transmission impairment.

Analog signals suffer more from attenuation than do digital signals.

________ noise is noncontinuous,consisting of irregular pulses or noise spikes of short duration and of relatively high amplitude.It is generated from a variety of causes such as lightning and faults and flaws in the communications system.

Guided media,also called wireless,provide a physical means for guiding electromagnetic waves through seawater.

The communication of data by the propagation and processing of signals is ________.

The term ________ is used to refer to the transmission path between two devices in which signals propagate directly from transmitter to receiver with no intermediate devices other than amplifiers or repeaters used to increase signal strength.