WIRED COMMUNICATIONS (prelim) Flashcards
1
Q
The transmission of data over a wire-based communication technology.
A
Wired Communications
2
Q
It allows more than one signal to be transmitted in a single medium
A
Multiplexing
3
Q
Wired line used for high-power applications
A
Waveguides
4
Q
The three basic components of the optical transmission system
A
Light source
Transmission media
Detector
5
Q
A type of medium that transmits information in the form of light
A
Fiber Optic
6
Q
This signal is a continuous signal that varies in amplitude or frequency over time and represents information.
A
Analog Signal
7
Q
This signal is a discrete signal, typically represented by binary values (0s and 1s), used for representing information.
A
Discrete Signal
8
Q
An electronic device that converts information into a signal suitable for transmission over a medium.
A
Transmitter
9
Q
An electronic device that detects and interprets the transmitted signal to retrieve the original information.
A
Receiver
10
Q
Another term for the demodulation process
A
Detection
11
Q
A type of medium that is immune to Electromagnetic interference
A
Fiber Optic
12
Q
Type of medium that transmits signals or data in the form of electronic signals
A
Copper Wire
13
Q
This type of medium has a high bandwidth
A
Fiber Optic
14
Q
This type of medium is prone to corrosion
A
Copper wire
15
Q
One of the disadvantages of this medium is its limited bandwidth
A
Copper Wire
16
Q
This type of medium has high attenuation
A
Copper wire
17
Q
It is the term for information, audio and voice signals
A
Intelligence
18
Q
The physical path over which a signal can travel
A
Communication Circuit
19
Q
The actual path for the signal to travel
A
Communication Channel
20
Q
This circuit uses AD and DC to carry signal
A
Electric Circuit
21
Q
This uses rapidly varying current to carry signal
A
Electromagnetic Circuit
22
Q
This uses light as the data carrier on a transparent media
A
Photonic Circuits
23
Q
It is used for types of remote control electrical equipment and in some LANs
A
Power Line Communication
24
Q
It is when electronic signals are added to power line voltages
A
Power Line Communications
25
It is the unwanted coupling between the signal path
Crosstalk
26
When the signal from one cable leaks with another pair
Crosstalk
27
This avoids crosstalk
Twisting cables
28
This type of cable is commonly used as an Ethernet cable
Unshielded Twisted Pair
28
It is the radiation of one signal to another
crosstalk
28
This type of cable is best suited in high interference environment
Shielded Twisted Pair
29
This cable has an individual pair of wires wrapped in foil and then are wrapped again for double protection
Shielded Twisted Pair
30
This cable has each pair of ire twisted together and then wrapped in tubing without any other protection
Unshielded Twisted Pair
30
Which part of the coaxial cable is shielded?
Ground
30
The bandwidth for coaxial cable
300MHZ, 500MHZ, 750MHZ
30
This type of wire is commonly used in telephone system
Twisted Pair
31
This cable is used in Ethernet networks
Twisted Pair
31
This technique reduces electromagnetic interference from external sources
Twisting of wires
32
This wire provides varying levels of protection against signal degradation and interference.
Twisted Pair
33
two types of Twisted pair wire
Shielded Twisted Pair
Unshielded Twisted Pair
34
It is the reduction of the signal as it travels in the medium
Attenuation
35
This helps the signal to keep a constant level as it travels through the medium
amplifiers
36
This cable has the greatest bandwidth among the three types of cable
Fiber Optic Cable
37
This cable is made up of very small one-way glass strands.
Fiber Optic Cable
38
This cable is commonly used in highspeed backbones
Fiber Optic Cable
39
This cable uses light rather than electricity
Fiber Optic Cable
40
The process of making the information more suitable for the medium
Modulation
41
This process allows more than one signal to be transmitted over a single medium
Multiplexing
42
The device which converts signals from Analog to Digital and back again
Modem
43
The high-frequency signal is added to the original signal to allow transmission over long distances
Carrier
44
A fiber optic technique that employs multiple light wavelengths to transmit data
Dense Wave Division Multiplexing
45
Frequency range used in power lines
ELF
46
The frequency range known as subcarriers is mostly used in aeronautical and marine communications
LF
47
range for infrared
100 to 0.7 micrometers
48
range for ultraviolet
4 to 400 nanometers
49
Type of wireless transmission media that distribute signals through air over long distances
Broadcast Radio
50
Type of wireless transmission media used in mobile communications
Cellular Radio
51
Type of wireless transmission media that uses HF range to transmit voice or data
Cellular Radio
52
This type of wireless transmission media provides highspeed transmission
Microwave
53
Wireless transmission media that uses infrared to transmit data
Infrared
54
Type of twisted pair cable that has a 10 Mbps transfer rate
10-BaseT (Ethernet)
55
Type of twisted pair cable that has a 100 Mbps transfer rate
100-BaseT (Fast Ethernet)
56
Type of twisted pair cable that has a 1000 Mbps transfer rate
1000-BaseT (Gigabit Ethernet)
57
Type of twisted pair cable that has a 4-16 Mbps transfer rate
Token Ring
58
Two types of coaxial cable that have 10Mbps transfer rate
10-Base2 (Ethernet)
10-Base5 (Fast Ethernet)
59
Type of fiber optic that has a 10Mbps transfer rate
10-BaseF (Ethernet)
60
Type of fiber optic that has a 100Mbps transfer rate
10-BaseFX (Fast Ethernet)
61
what does FDDI mean?
Fiber Distributed Data Interface
62
A one-way electronic communication
Simplex
63
Radio Broadcasting is what type of communication?
Simplex
64
A two-way communication in which both parties can transmit and receive simultaneously
Full Duplex
65
A two-way communication in which both parties can transmit and receive signals one at a time
Half Duplex
66
How many times an event occur at a time
Frequency
67
The distance between two points of a similar periodic wave
Wavelength
68
The distance travelled by an electromagnetic wave in one cycle
wavelength
69
The portion of the electromagnetic spectrum that is occupied by a signal
bandwidth
70
The range of frequencies in which signals are transmitted
bandwidth
71
Also known as myriametric signal
VLF
72
Also known as kilometric signal
LFA
73
known as hectometric signal
MF
74
High frequencies are also known as
decametric signal
75
other term for very high frequencies
metric signals
76
other term for ultrahigh frequencies
decimetric signals
77
widely used in satellite communications
EHF
78
What is the other term for SHF
centimetric signal
79
also known as EHF
millimetric signals
80
commonly used in satellite and radar communications
EHF
81
indicates the relationship between two power
decibel
82
The oldest form of communication recorded in history. It is used during war
Smoke signals
83
The greek word "helios" means
sun
84
It is a type of early communication in which it uses mirror, sun, and morse code to transfer messages wirelessly
Heliograph
85
The Greek word for write is
Graphien
86
who invented the semaphore?
Mr. Claude Chappe
87
When did Chappe invent the semaphore?
1794
88
This early communication system used a flag-based alphabet
semaphore
89
who discovered the effect of electrolytic decomposition to
devise an electric telegraph.
Samuel Soemmerring
90
A type of device used for communication over long distances in which the message can be read by the amount of gases the electrolysis caused
Electromechanical telegraph
91
He discovered the effect of electrolytic decomposition to
devise an electric telegraph.
Samuel Soemmering
92
It is the first successful electric telecommunication device
Needle telegraph
93
Who patented the needle telegraph?
Charles Wheatstone and William Fothergill
94
It is the first successful and practical data communication code to transmit info
Morse's Telegraph
95
A type of telegraph that alphabets and numbers are placed at the edge of a circular plate
Dial Telegraph
96
He developed the automatic telegraph
Thomas Edison
97
A device that uses messages encoded on perforated paper
Automatic Telegraph
98
A 28-key piano-like device that transmits information by pressing the key corresponding to the letter.
Printing Telegraph
99
who invented the printing telegraph?
Royal Earl House
100
He invented the string telephone
Robert Hooke
101
A communication device in which it transmits data in long wires through mechanical vibrations.
String Telephone
102
what are the two other terms for string telephone?
Acoustic telephone and Mechanical telephone
103
He developed the speaking telegraph
Innocenzo Manzetti
104
when did Innocenzo Manzetti invent the speaking telegraph?
1843
105
He suggested that sound could be transmitted electrically
Charles Boursel (1854)
106
He developed a voice communication in his house and called it "telettrofoni"
Antonio Meucci
107
When did Meucci develop telettrofoni in his house?
1857
108
He developed a device that could transmit electrical notes
Johann Philipp Reis (1860)
109
He described his device "Telephon"
Johann Philipp Reis (1860)
110
He designed a voice transmitter consisting of a cavity filled with
granules of carbonized anthracite coal.
Thomas Alva Edison
111
when did the concept of mounting the transmitter and receiver in the same handle?
1878
112
When was the first commercial telephone available?
1877
113
The year AT&T produced the wall magneto telephone
1907
114
the year desk telephones are available
1897
115
The year AT&T introduced the E1A Headset
1927
116
The year when the first telephone that has all components in a single apparatus
1937
117
The year push-button telephones are available
1963
118
VoIP meaning
Voice over Internet Protocol
119
The first combined telephone and personal digital assistant
IBM Simon
