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ITEC45 > P-Exam > Flashcards

P-Exam Flashcards

(98 cards)

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1
Q

Includes telephony, telegraphy, and television, means communication.

A

Telecommunication

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2
Q

tele is Greek for?

A

Far

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3
Q

Refers to information presented in whatever form is agreed upon.

A

Data

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4
Q

The exchange of data between two devices via some form of transmission medium such as a wire cable.

A

Data Communication

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5
Q

4 Fundamental Characteristics of Data Communication

A
  1. Delivery
  2. Accuracy
  3. Timeliness
  4. Jitter
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6
Q

Refers to the variation in the packet arrival time. It is the uneven delay in the delivery of audio or video packets.

A

Jitter

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7
Q

It is a mode of communication where the communication is encoded digitally as discrete signals and electronically transferred.

A

Digital Communication

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8
Q

Digital Communication Techniques

A
  1. Digital Transmission
  2. Digital Radio
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9
Q

Is the transmission of digital pulses between two or more points in a communication system.

A

Digital Transmission

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10
Q

Is the transmission of digital modulated analog carriers between two or more points in a communication system.

A

Digital Radio

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11
Q

Elements of Digital Communication

A
  1. Information source and input transducer
  2. Source encoder
  3. Channel encoder
  4. Digital modulator
  5. Channel
  6. Digital demodulator
  7. Channel decoder
  8. Source decoder
  9. Output transducer
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12
Q

A transducer that takes physical input and converts it to an electrical signal.

A

Information source or input transducer

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13
Q

The process of efficiently converting the output of whether analog or digital source into a sequence of binary digits.

A

Source Encoding

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14
Q

Does the coding for error correction.

A

Channel Encoder

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15
Q

Physical medium that is used for transmitting signals from transmitter to receiver.

A

Channel

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16
Q

Demodulator that processes the channel corrupted transmitted waveform and reduces the waveform to the sequence of numbers.

A

Digital Demodulator

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17
Q

Attempts to reconstruct the original information sequence from the knowledge of the code used by the channel encoder.

A

Channel Decoder

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18
Q

Components of Digital Communication

A
  1. Message
  2. Sender
  3. Receiver
  4. Transmission Medium
  5. Protocol
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19
Q

The physical path which by a message travels from sender to receiver.

A

Transmission Medium

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20
Q

Set of rules that govern data communications.

A

Protocol

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21
Q

It is an electromagnetic current that is used for carrying data from one device to another.

A

Signal

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22
Q

Types of Signals

A
  1. Analog Signal
  2. Digital Signal
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23
Q

Signal that is in continuous waveform in nature and represented by continuous electromagnetic waves.

A

Analog Signal

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24
Q
A
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25
Signal that is discrete in nature and represent sequence of voltage pulses. Also used for circuitry of computer.
Digital Signal
26
Communication path through which data or information can be send from one node to another.
Channel
27
Maximum rate at which data can be transmitted over a communication path or channel.
Channel Capacity
28
The physical means by which data is transmitted from one geographic or electronic location.
Transmission Media
29
The higher the ______ of a signal, the higher data rate that can be achieved.
Bandwidth
30
Impairments such as attenuation limits the distance.
Transmission Impairments
31
Competing signals in overlapping frequency bands can distort or wipeout signal.
Interference
32
Types of Transmission Media
1. Unguided Media 2. Guided Media
33
Guided Media Examples
1. Twisted Pair Cable 2. Coaxial Cable 3. Optical Fibre Cable
34
Unguided Media Examples
1. Infrared 2. Radiowaves 3. Microwaves
35
Signals being transmitted are directed and confined in a narrow pathway.
Guided Media or Bounded
36
Made up of an external conductor (usually copper) wrapped in a jacket made of non-conductive material.
Guided Media or Bounded
37
Is named after the two conductors that run parallel to each other.
Coaxial Cable
38
Two Modes Transmission of Coaxial Cable
1. Baseband Mode 2. Broadband Mode
39
Use digital signaling over a single wire. Also a bidirectional, allowing computers to both send and receive data.
Baseband Mode
40
41
Uses digital signaling, for signals to be both received the transmission media must be split into two channels.
Broadband Mode
42
Consists of two separately insulated conductor wires wound about each other.
Twisted Pair
43
The unintentional transfer of signal from one channel to another channel, creating interference.
Crosstalk
44
Type of cable that has the ability to block interference and does not depend on a physical shield.
Unshielded Twisted Pair (UTP)
45
Type of cable consists of a special jacket to block external interference.
Shielded Twisted Pair (STP)
46
It uses the concept of "reflection of light" through a core and made up of glass or plastic.
Optical Fibre
47
A less dense glass or plastic covering is called?
Cladding
48
Cable that is used for transmission of large volumes of data.
Optical Fibre
49
Types of Fibre Cable
1. Single Mode Cable 2. Multi Mode Cable
50
Uses of Fibre Optic Cable
1. Internet 2. Telephone 3. Computer and Networking 4. Automotive Industry 5. Surgery and Dentistry
51
No physical medium is required for the transmission of electromagnetic signals.
Unguided Media or Unbounded
52
These are easy to generate and can penetrate through buildings.
Radio Waves
53
Majorly used for mobile phone communication and television distribution.
Microwaves
54
Very short distance communication. They cannot penetrate through obstacles.
Infrared
55
Refers to the communication or transmission of information over a distance without requiring wires, cables, or any electrical conductors.
Wireless Media
56
Types of Wireless Media
1. Satellite Communication 2. Infrared Communication 3. Microwave Communication 4. WiFi 5. Bluetooth Technology
57
2 Types of USB (Universal Serial Bus)
1. Series A 2. Series B
58
59
Is the transfer of data or information between a source and a receiver.
Data Communication
60
Criteria of Data Communication Network (5)
1. Performance 2. Consistency 3. Reliability 4. Recovery 5. Security
61
Is defined as the rate of transference of error free data.
Performance
62
The elapsed time between the end of an inquiry and the beginning of a response.
Response Time
63
Factors that can affect response time
1. Number of users 2. Transmission speed 3. Media type 4. Hardware type 5. Software program
64
The more users on a network, the slower the network will run.
Number of Users
65
The speed that the data will be transmitted at measured in bits per second (bps).
Transmission Speed
66
The type of physical connection used to connect nodes together.
Media Type
67
Slow computers such as XT or Pentiums.
Hardware Type
68
How well is the network operating system (NOS) written.
Software Program
69
The predictability of response time and accuracy of data.
Consistency
70
Is the measure of how often a network is usable.
Reliability
71
Is a measure of the average time a component is expected to operate between failures, and is normally provided by manufacturer.
MTBF (Mean Time Between Failures)
72
Is the network's ability to return to a prescribed level of operation after a network failure.
Recovery
73
Is the protection of hardware, software and data from unauthorized access.
Security
74
Basic Components of Communication
1. Source 2. Medium 3. Receiver
75
The transmitter of data.
Source
76
The communication stream through which the data is being transmitted.
Medium
77
The receiver of the data transmitted.
Receiver
78
The interface between the source and the medium, and the medium and the receiver.
Data Communication Equipment (DCE)
79
Refers to the computer hardware devices use to establish, maintain and terminate communication network sessions between a data source and its destination.
Data Communication Equipment (DCE)
80
Is used primarily to preform signal exchange.
DCE
81
Works as a translator of digital and analog signals.
DCE
82
Is the telecommunications name given to the source and receiver's equipment.
Data Terminal Equipment (DTE)
83
Also called as tail circuits.
DTE
84
It is an end instrument that converts user information into signals or reconverts received signals.
DTE
85
Uses of Computer Network
1. Business 2. Scientific Uses
86
Defines the direction of a signal flow between two connected devices.
Transmission Modes
87
Also know as communication mode.
Transmission Mode
88
Types of Communication Modes
1. Serial Communication 2. Parallel Communication
89
Is the process of sending data one bit a time, sequentially, over a communication channel or computer bus.
Serial Communication
90
Bit serial communication is normally called ________.
Serial Transmission
91
Is a method of sending several data signals simultaneously over a transmission link one at a time.
Parallel Communication
92
Data Transmission Modes
1. Simplex Mode 2. Half Duplex Mode 3. Full Duplex Mode
93
The communication is unidirectional, as one-way street.
Simplex Mode
94
Is used in cases where there is no need for communication in both direction at the same time.
Half Duplex Mode
95
Both stations can transmit and receive simultaneously. Signals going in one direction share the capacity of the link with signals going in other direction.
Full Duplex Mode
96
These used motors driving cams which actuated solenoids which sampled the signal at specific time intervals.
Asynchronous Serial Transmission
97
Is used to synchronize the receiver to the sender.
Synchronous Serial Transmission
98
Two Main Types of Synchronous Protocols
1. Character Oriented (Bisync) 2. Bit Orientated (HDLC)

ITEC45 (2 decks)

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