Exam 3: Data Transmission

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

A reduction in strength is ________.

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

Analog signals suffer more from attenuation than do digital signals.

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

Thermal noise is also referred to as ________ noise.

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

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

________ 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.

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

The sine wave is the fundamental aperiodic signal.

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

An example of digital data is ________ or character strings.

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

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 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.

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

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

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