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INSY 3303 | Exam 2 | Koshy Spring 2020 > CH 3 > Flashcards

CH 3 Flashcards

1
Q

____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.

A

adaptive differential pulse code modulation

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2
Q

Frequency modulation refers to the changing of the height of the sound wave.
T
F

A

False

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3
Q

Time (non-statistical) division multiplexing differs from frequency division multiplexing because it:

A) does not share a communication circuit

B) splits the communication circuit vertically (with time slots) instead of horizontally

C) increases the wavelength and phase angles of the baseband frequency used for transmission

D) moves the baseband of a circuit by shifting it to a higher frequency

E) reduces baseband signal velocity more than frequency division multiplexing

A

B) splits the communication circuit vertically (with time slots) instead of horizontally

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4
Q

Digital transmission produces more errors than analog transmission.
t or f

A

False

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5
Q

Digital transmission permits higher maximum transmission rates when compared to analog.
t or f

A

True

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6
Q

Multimode fiber is capable of longer transmission distances than single mode fiber.
t or f

A

False

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7
Q

_____________ can be thought of as dividing the circuit horizontally.

Frequency division multiplexing
Statistical frequency division multiplexing
Statistical time division multiplexing
Time division multiplexing
Wavelength division multiplexing
A

Frequency division multiplexing

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8
Q

Data is physically transmitted from one computer or terminal to another in the ________ layer.

A

physical

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9
Q

With modem communications, the receiving modem converts the incoming digital signal from the telephone line into an analog signal that can be understood by the computer.
T or F

A

F

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10
Q

A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.

transponder
multiplexer
inverse multiplexer
codec
intelligent terminal
A

multiplexer

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11
Q

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals?

phase
attenuation
bipolar
bandwidth
codec
A

phase

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12
Q

_____________ is not a form of modulation used to transform digital data into analog signals.

synchronous time division
amplitude shift keying
amplitude modulation
frequency modulation
phase modulation
A

synchronous time division

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13
Q

In general, networks designed to transmit primarily computer data are likely to be ________.

international
level 1
numeric
analog
digital
A

digital

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14
Q

Which type of digital signaling would experience fewer errors because it has more distinct signals?

unipolar
serial
bipolar
attenuation
Huffman encoding signal
A

bipolar

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15
Q

A _________ is an FDM device that splits the physical circuit into three logical circuits (phone, upstream data, downstream data).

DSL modem
cable modem
wireless router
V.44 modem
Serial modem
A

DSL modem

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16
Q

The representation of the character A by the group of 8 bits, 01000001, is an example of:

digital coding
phase modulation
binary modulation
analog transmission
pitch variation
A

digital coding

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17
Q

Based on the TIA/EIA 568-B structured cabling standard, the cabling that runs from the telecommunications closet to each work area is called backbone cabling.

True or False

A

F

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18
Q

In general, older networks and local loops designed to transmit voice data are likely to be ________.

international
level 2
numeric
digital
analog
A

analog

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19
Q

Microwave transmissions require a line of sight between any two points.

T or F

A

T

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20
Q

Which of the following statements is correct?

A) Parallel transmission is most often used for sending data on a circuit that is made up of one wire.

B) Parallel transmission is distinguished from serial transmission by the fact that the transmitting device sends a single bit, then a second bit, and so on, until all the bits are transmitted.

C) Parallel transmission is only used for analog data.

D) Serial transmission is slower than parallel transmission.

E) Parallel transmission is the same as serial transmission.

A

D) Serial transmission is slower than parallel transmission.

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21
Q

Signal bandwidth is the difference between the highest and lowest frequencies in a band.

T or F

A

T

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22
Q

Fiber optic cable can only be used on LANs.

T or F

A

F

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23
Q

______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission).

Line-of-sight effect
Multimode index
Saturation effect
Raindrop attenuation
Propagation delay
A

Propagation delay

24
Q

Radio data transmission requires that each device has a radio receiver/transmitter and uses a specific frequency.
T or F

A

T

25
Q

In a multipoint circuit configuration, each computer can use the circuit at the same time.

T or F

A

F

26
Q

Equipment used to transform analog voice signals to digital signals and digital signals to analog signals.

voice converter
modem
codec
multiplexer
demodulator
A

codec ?

27
Q

Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.

t or f

A

F

28
Q

A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.

transponder
multiplexer
inverse multiplexer
codec
intelligent terminal
A

multiplexer

29
Q

A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters.
Group of answer choices

256
20
200
512
1024
A

1024

30
Q

The medium is the physical matter or substance that carries the voice or data transmission.

True
False

A

T

31
Q

In full-duplex transmission, two stations can send and receive simultaneously.
T or F

A

T

32
Q

ASCII is the least popular code for data communications.

T or F

A

F

33
Q

___________ refers to the spreading of the signal that different parts of the signal arrive at different times at the destination.

turnaround time
propagation delay
dispersion
insulation
attenuation
A

dispersion

34
Q

Having a conversation with someone using a cellular phone is an example of _________ transmission.

simplex
full-duplex
half-duplex
analog
digital
A

full-duplex

35
Q

______ is a modem standard that uses Lempel-Ziv encoding to compress data.

V.22
V.44
V.32bis
V.34
RS 232
A

V.44

36
Q

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:

wavelength division multiplexer
time division multiplexer
statistical time division multiplexer
frequency division multiplexer
statistical frequency division multiplexer
A

wavelength division multiplexer

37
Q

Of all the media available, fiber optic provides the highest transmission speeds.
T or F

A

T

38
Q

Two fundamentally different types of data are:

DSL and ADSL
asymmetric and symmetric
Microsoft and IBM
digital and analog
local area and wide area
A

digital and analog

39
Q

WDM is a version of FDM used in fiber-optic cables.

T or F

A

T

40
Q

One way to reduce quantizing errors is to increase the sampling rate of the analog signal.
T or F

A

T

41
Q

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?

bandwidth modulation
amplitude modulation
frequency modulation
phase modulation
codec modulation
A

phase modulation

42
Q

_____________ refers to the difference between the original analog data and the approximation of that data using the techniques for translating from analog data to digital signals.
Group of answer choices

quantizing error
handshaking phase
modulating frequency
POTS anomaly
amplitude Trellis effect
A

quantizing error

43
Q

Another term for the weakening of a signal over distance is:

turnaround time
propagation delay
dispersion
insulation
attenuation
A

attenuation

44
Q

Frequency is the number of cycles per second and is expressed in Hertz.
T or F

A

T

45
Q

Data compression can increase the throughput of a communication link.
T or F

A

T

46
Q

Manchester encoding is a special type of bipolar signaling in which the signal is changed from high to low or from low to high in the middle of the signal.

T or F

A

T

47
Q

The room that contains the cable termination points and the distribution frames is referred to as

telecommunications closet
equipment room
building entrance
backbone room
work area
A

Telecommunications Closet

48
Q

Computers produce digital data whose values are binary: 0 or 1.
T or F

A

T

49
Q

The direction in which the sound wave begins is known as:

amplitude, which our ears detect as loudness
frequency, which our ears detect as pitch
phase
bandwidth
furlong

A

phase

50
Q

With respect to converting digital data into analog signals, AM stands for:
Group of answer choices

Asynchronous Manchester
Analog Multimode
Amplitude Modulation
Anomaly Multiplexing
Analytical Mosaic
A

Amplitude Modulation

51
Q

When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would be _______.
Group of answer choices

24
16
2
8
4
A

16

52
Q

The typical range of human hearing is:
Group of answer choices

0 to 4,000 Hz
0 to 1,200 Hz
20 to 14,000 Hz
0 to 300 Hz
0 to 56,000 Hz
A

20 to 14,000 Hz

53
Q

One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain.
T or F

A

T

54
Q

____________ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.

quadrature amplitude modulation
time division multiplexing
synchronous digital line control
pulse code modulation
baseband signaling
A

quadrature amplitude modulation

55
Q

When all bits of a character are transferred one after another, the bits are transferred in ___________ mode.

serial
frequency division
multiplexing
parallel
full complex
A

serial

INSY 3303 | Exam 2 | Koshy Spring 2020 (2 decks)

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