Chapter 3 Assessment
ASCII is the least popular code for data communications. TRUE/FALSE
False
Frequency division multiplexing divides the circuit into a set of different time slots. TRUE/FALSE
False
Frequency modulation refers to the changing of the height of the sound wave. TRUE/FALSE
False
Of all the media available, fiber optic provides the highest transmission speeds. TRUE/FALSE
True
Signal bandwidth is the difference between the highest and lowest frequencies in a band. TRUE/FALSE
True
___________ is the basic physical layout of the circuit. configuration circuit plan circuit configuration circuit design point-to-point configuration
circuit configuration
Which of the following media has the lowest error rates and the highest transmission speeds? infrared unshielded twisted pair coaxial cable fiber optic cable shielded twisted pair
fiber optic cable
The two basic types of media are: guided and wireless (radiated) attenuator and Gaussian statistical and frequency duplexed and non-duplexed local and wide area
guided and wireless (radiated)
The ability to transmit in both directions, but only in one direction at a time is an example of ___________ transmission. full-duplex analog simplex half-duplex digital
half-duplex
With respect to converting digital data into analog signals, AM stands for: Analog Multimode Analytical Mosaic Amplitude Modulation Asynchronous Manchester Anomaly Multiplexing
Amplitude Modulation
Which of the following would be considered a type of wireless media? microwave fiber optics coaxial cable unshielded twisted pair shielded twisted pair
microwave
__________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0. modulation sampling digitizing shaping demodulation
modulation
Which of the following is NOT a key advantage of digital transmission? It is more efficient. It is simpler to integrate voice, video, and data on the same circuit. It produces fewer errors. It is more secure. It permits only low transmission rates.
It permits only low transmission rates.
A walkie-talkie is an example of half-duplex transmission. TRUE/FALSE
True
Amplitude, frequency and phase are all characteristics of a sound wave. TRUE/FALSE
True
The height of a sound wave is called its : bandwidth phase frequency amplitude furlong
amplitude
Another term for the weakening of a signal over distance is: attenuation propagation delay insulation turnaround time dispersion
attenuation
__________ refers to the spreading of the signal that different parts of the signal arrive at different times at the destination. attenuation insulation turnaround time propagation delay dispersion
dispersion
Data is physically transmitted from one computer or terminal to another in the ________ layer. data link terminal application transport physical
physical
______________ is NOT a form of modulation used to transform digital data into analog signals. amplitude modulation phase modulation amplitude shift keying frequency modulation synchronous time division
synchronous time division
