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ITEC45 > P-Exam > Flashcards

P-Exam Flashcards

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
Q

Signal that is discrete in nature and represent sequence of voltage pulses. Also used for circuitry of computer.

A

Digital Signal

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26
Q

Communication path through which data or information can be send from one node to another.

A

Channel

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27
Q

Maximum rate at which data can be transmitted over a communication path or channel.

A

Channel Capacity

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28
Q

The physical means by which data is transmitted from one geographic or electronic location.

A

Transmission Media

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29
Q

The higher the ______ of a signal, the higher data rate that can be achieved.

A

Bandwidth

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30
Q

Impairments such as attenuation limits the distance.

A

Transmission Impairments

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31
Q

Competing signals in overlapping frequency bands can distort or wipeout signal.

A

Interference

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32
Q

Types of Transmission Media

A
  1. Unguided Media
  2. Guided Media
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33
Q

Guided Media Examples

A
  1. Twisted Pair Cable
  2. Coaxial Cable
  3. Optical Fibre Cable
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34
Q

Unguided Media Examples

A
  1. Infrared
  2. Radiowaves
  3. Microwaves
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35
Q

Signals being transmitted are directed and confined in a narrow pathway.

A

Guided Media or Bounded

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36
Q

Made up of an external conductor (usually copper) wrapped in a jacket made of non-conductive material.

A

Guided Media or Bounded

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37
Q

Is named after the two conductors that run parallel to each other.

A

Coaxial Cable

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38
Q

Two Modes Transmission of Coaxial Cable

A
  1. Baseband Mode
  2. Broadband Mode
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39
Q

Use digital signaling over a single wire. Also a bidirectional, allowing computers to both send and receive data.

A

Baseband Mode

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41
Q

Uses digital signaling, for signals to be both received the transmission media must be split into two channels.

A

Broadband Mode

42
Q

Consists of two separately insulated conductor wires wound about each other.

A

Twisted Pair

43
Q

The unintentional transfer of signal from one channel to another channel, creating interference.

44
Q

Type of cable that has the ability to block interference and does not depend on a physical shield.

A

Unshielded Twisted Pair (UTP)

45
Q

Type of cable consists of a special jacket to block external interference.

A

Shielded Twisted Pair (STP)

46
Q

It uses the concept of “reflection of light” through a core and made up of glass or plastic.

A

Optical Fibre

47
Q

A less dense glass or plastic covering is called?

48
Q

Cable that is used for transmission of large volumes of data.

A

Optical Fibre

49
Q

Types of Fibre Cable

A
  1. Single Mode Cable
  2. Multi Mode Cable
50
Q

Uses of Fibre Optic Cable

A
  1. Internet
  2. Telephone
  3. Computer and Networking
  4. Automotive Industry
  5. Surgery and Dentistry
51
Q

No physical medium is required for the transmission of electromagnetic signals.

A

Unguided Media or Unbounded

52
Q

These are easy to generate and can penetrate through buildings.

A

Radio Waves

53
Q

Majorly used for mobile phone communication and television distribution.

A

Microwaves

54
Q

Very short distance communication. They cannot penetrate through obstacles.

55
Q

Refers to the communication or transmission of information over a distance without requiring wires, cables, or any electrical conductors.

A

Wireless Media

56
Q

Types of Wireless Media

A
  1. Satellite Communication
  2. Infrared Communication
  3. Microwave Communication
  4. WiFi
  5. Bluetooth Technology
57
Q

2 Types of USB (Universal Serial Bus)

A
  1. Series A
  2. Series B
59
Q

Is the transfer of data or information between a source and a receiver.

A

Data Communication

60
Q

Criteria of Data Communication Network (5)

A
  1. Performance
  2. Consistency
  3. Reliability
  4. Recovery
  5. Security
61
Q

Is defined as the rate of transference of error free data.

A

Performance

62
Q

The elapsed time between the end of an inquiry and the beginning of a response.

A

Response Time

63
Q

Factors that can affect response time

A
  1. Number of users
  2. Transmission speed
  3. Media type
  4. Hardware type
  5. Software program
64
Q

The more users on a network, the slower the network will run.

A

Number of Users

65
Q

The speed that the data will be transmitted at measured in bits per second (bps).

A

Transmission Speed

66
Q

The type of physical connection used to connect nodes together.

A

Media Type

67
Q

Slow computers such as XT or Pentiums.

A

Hardware Type

68
Q

How well is the network operating system (NOS) written.

A

Software Program

69
Q

The predictability of response time and accuracy of data.

A

Consistency

70
Q

Is the measure of how often a network is usable.

A

Reliability

71
Q

Is a measure of the average time a component is expected to operate between failures, and is normally provided by manufacturer.

A

MTBF (Mean Time Between Failures)

72
Q

Is the network’s ability to return to a prescribed level of operation after a network failure.

73
Q

Is the protection of hardware, software and data from unauthorized access.

74
Q

Basic Components of Communication

A
  1. Source
  2. Medium
  3. Receiver
75
Q

The transmitter of data.

76
Q

The communication stream through which the data is being transmitted.

77
Q

The receiver of the data transmitted.

78
Q

The interface between the source and the medium, and the medium and the receiver.

A

Data Communication Equipment (DCE)

79
Q

Refers to the computer hardware devices use to establish, maintain and terminate communication network sessions between a data source and its destination.

A

Data Communication Equipment (DCE)

80
Q

Is used primarily to preform signal exchange.

81
Q

Works as a translator of digital and analog signals.

82
Q

Is the telecommunications name given to the source and receiver’s equipment.

A

Data Terminal Equipment (DTE)

83
Q

Also called as tail circuits.

84
Q

It is an end instrument that converts user information into signals or reconverts received signals.

85
Q

Uses of Computer Network

A
  1. Business
  2. Scientific Uses
86
Q

Defines the direction of a signal flow between two connected devices.

A

Transmission Modes

87
Q

Also know as communication mode.

A

Transmission Mode

88
Q

Types of Communication Modes

A
  1. Serial Communication
  2. Parallel Communication
89
Q

Is the process of sending data one bit a time, sequentially, over a communication channel or computer bus.

A

Serial Communication

90
Q

Bit serial communication is normally called ________.

A

Serial Transmission

91
Q

Is a method of sending several data signals simultaneously over a transmission link one at a time.

A

Parallel Communication

92
Q

Data Transmission Modes

A
  1. Simplex Mode
  2. Half Duplex Mode
  3. Full Duplex Mode
93
Q

The communication is unidirectional, as one-way street.

A

Simplex Mode

94
Q

Is used in cases where there is no need for communication in both direction at the same time.

A

Half Duplex Mode

95
Q

Both stations can transmit and receive simultaneously. Signals going in one direction share the capacity of the link with signals going in other direction.

A

Full Duplex Mode

96
Q

These used motors driving cams which actuated solenoids which sampled the signal at specific time intervals.

A

Asynchronous Serial Transmission

97
Q

Is used to synchronize the receiver to the sender.

A

Synchronous Serial Transmission

98
Q

Two Main Types of Synchronous Protocols

A
  1. Character Oriented (Bisync)
  2. Bit Orientated (HDLC)

ITEC45 (4 decks)

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