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Prelim > ITEC45 > Flashcards

ITEC45 Flashcards

1
Q

It includes telephony, telegraphy, and television, means communication at a distance.

A

Telecommunication

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2
Q

Tele is greek word for _____

A

Far

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3
Q

It refers to information presented in whatever form is agreed upon by the parties creating and using the data.

A

Data

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4
Q

These are 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

Four Fundamental Characteristic of DC

A
  • Delivery
  • Accuracy
  • Timeliness
  • Jitter
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6
Q

The system must deliver data to the correct destination.

A

Delivery

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7
Q

The system must deliver the data accurately.

A

Accuracy

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8
Q

The system must deliver data in a timely manner.

A

Timeliness

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9
Q

It refers to the variation in the packet arrival time.

A

Jitter

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10
Q

It is one of the most commonly used modes of communication now a days.

A

Data Communication

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11
Q

Data Communication Techniques

A
  • Digital Transmission
  • Digital Radio
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12
Q

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

A

Digital Transmission

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13
Q

It is the transmitted of digital modulated analog carries between two or more points in communication system.

A

Digital Radio

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14
Q

Elements of Digital Communication

A

a. Information Source and Input Transducer
b. Source Encoder
c. Channel Encoder
d. Digital Modulator
e. Channel
f. Digital Demodulator
g. Channel Decoder
h. Source Decoder
i. Output Transducer

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15
Q

The source of information can be analog or digital.

A

Information Source and Input Transducer

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16
Q

The signal produced by source is converted into digital signal consists of 0’s and 1’s.

A

Source Encoder

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17
Q

This sequence of binary digits is called _____ ______.

A

Information Sequence

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18
Q

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

A

Source Encoding or Data Compression

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19
Q

The information sequence is passed through the channel encoder.

A

Channel Encoder

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20
Q

The binary sequence is passed to digital modulator which in turns convert the sequence into electric signals so we can transmit them on channel.

A

Digital Modulator

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21
Q

The communication channel is the physical medium that is used for transmitting signals from transmitter to receiver.

A

Channel

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22
Q

It processes the channel corrupted transmitted waveform to the sequence of numbers that represents estimates of the transmitted data symbols.

A

Digital Demodulator

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23
Q

The sequence of numbers then passed through the channel decoder which attempts to reconstruct the original information sequence.

A

Channel Decoder

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24
Q

If an analog signal is desired then source decoder tries to decode the knowledge of the encoding algorithm.

A

Source Decoder

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25
Q

Finally we get the desired signal in desired format analog or digital.

A

Output Transducer

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26
Q

Components of Digital Communication

A
  1. Message
  2. Sender
  3. Reciever
  4. Transmission Medium
  5. Protocol
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27
Q

Popular forms of information include text, numbers, pictures, audio and video.

A

Message

28
Q

It is the device that sends data message.

A

Sender

29
Q

It is the device that recieves the message.

A

Reciever

30
Q

It is the physical path by which a message travels from sender to receiver.

A

Transmission Medium

31
Q

It is a set of rules that govern data communication.

A

Protocol

32
Q

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

A

Signal

33
Q

Types of Signals

A
  • Analog Signals
  • Digital Signals
34
Q

These are in continues wave form in nature and representes by continues electromagnetic waves.

A

Analog Signal

35
Q

These are discrete in nature and represents sequence of voltage pulses.

A

Digital Signal

36
Q

It is communication path through which data or information can be send from one node to another node.

A

Channel

37
Q

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

A

Channel Capacity

38
Q

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

A

Transmission Media

39
Q

It is a
physical path between the transmitter and the receiver.

A

Transmission medium

40
Q

All other factors remaining constant, the greater the bandwidth of a signal, the higher the data rate that
can be achieved.

A

Bandwidth

41
Q

For guided media, twisted pair generally suffers more impairment than coaxial cable, which in turn suffers more than optical fiber.

A

Transmission Impairments

42
Q

Interference from competing signals in overlapping
frequency bands can distort or wipe out a signal.

A

Interference

43
Q

A guided medium can be used to construct a point to-point link or a shared link with multiple attachments.

A

Number of receivers

44
Q

Types of Transmission Media

A
  • Guided Media or Bounded
  • Unguided Media or Unbounded
45
Q

Signals being transmitted are directed and confined in a narrow pathway by using physical links.

A

Guided Media or Bounded

46
Q

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

A

Coaxial Cable

47
Q

The transmissions themselves take the form of either electrical pulses or light.

A

Baseband Mode

48
Q

Uses analog signals in the form of optical or electromagnetic waves over multiple transmission frequencies.

A

Broadband Mode

49
Q

Most common coaxial standards

A
  • 50-Ohm RG-7 or RG-11 - Thicknet
  • 50-Ohm RG-58 - Cheapernet
  • 75-Ohm RG-59 - Television
  • 93-Ohm RG-62 - ARCNET
50
Q

It is made of pairs of solid or stranded copper twisted along each other.

A

Twisted Pair Cable

51
Q

is the unintentional transfer of signals from one channel to another channel, creating interference.

A

Crosswalk

52
Q

Type of cable has the ability to block
interference and does not depend on a physical shield for this purpose

A

Unshielded Twisted-pair

53
Q

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

A

Twisted Pair

54
Q

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

A

Optical Fibre Cable

55
Q

The core is surrounded by a less dense glass or plastic covering called the ________.

A

Cladding

56
Q

Optical Fibre

A
  • Speed
  • Distance
  • Bandwidth
  • Maintenance
  • Resistance
57
Q

It is a single stand (most applications use 2 fibers) of glass fiber with a diameter of 8.3 to 10 microns that has one mode of transmission.

A

Single Mode Cables

58
Q

Has a larger core diameter that lets multiple modes of light propagate.

A

Multi-Mode Cables

59
Q

Uses of Fibre Optic Cable

A

➢ Internet
➢ Cable Television
➢ Telephone
➢ Computer Networking
➢ Surgery and Dentistry
➢ Mechanical Inspections
➢ Military and Space Applications
➢ Automotive Industry

60
Q

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

A

Unguided Media or Unbounded

61
Q

Types of Unguided media

A
  • Radio waves
  • Microwaves
  • Infrared
62
Q

These are easy to generate and can penetrate through buildings. The sendingnand receiving antennas need not be aligned. Frequency Range:3KHz
– 1GHz

A

Radio waves

63
Q

These are majorly used for mobile phone communication and television distribution.

A

Microwaves

64
Q

It is used for very short distance communication. They cannot penetrate through obstacles.
This prevents interference between systems.

A

Infrared

65
Q

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

A

Wireless Media

66
Q

Types of wireless media

A

a) Satellite communication
b) Infrared Communication
c) Broadcast Radio
d) Microwave Communication
e) Wi-Fi
f) Mobile Communication Systems
g) Bluetooth Technology

Prelim (3 decks)

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