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ITEC45 Flashcards

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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
Finally we get the desired signal in desired format analog or digital.
Output Transducer
26
Components of Digital Communication
1. Message 2. Sender 3. Reciever 4. Transmission Medium 5. Protocol
27
Popular forms of information include text, numbers, pictures, audio and video.
Message
28
It is the device that sends data message.
Sender
29
It is the device that recieves the message.
Reciever
30
It is the physical path by which a message travels from sender to receiver.
Transmission Medium
31
It is a set of rules that govern data communication.
Protocol
32
It is an electrical or electromagnetic current that is used for carrying data from device to another.
Signal
33
Types of Signals
- Analog Signals - Digital Signals
34
These are in continues wave form in nature and representes by continues electromagnetic waves.
Analog Signal
35
These are discrete in nature and represents sequence of voltage pulses.
Digital Signal
36
It is communication path through which data or information can be send from one node to another node.
Channel
37
Maximum rate at which data can be transmitted over a communication path or channel.
Channel Capacity
38
The physical means by which data is transmitted from one geographic or electronic location to another is called.
Transmission Media
39
It is a physical path between the transmitter and the receiver.
Transmission medium
40
All other factors remaining constant, the greater the bandwidth of a signal, the higher the data rate that can be achieved.
Bandwidth
41
For guided media, twisted pair generally suffers more impairment than coaxial cable, which in turn suffers more than optical fiber.
Transmission Impairments
42
Interference from competing signals in overlapping frequency bands can distort or wipe out a signal.
Interference
43
A guided medium can be used to construct a point to-point link or a shared link with multiple attachments.
Number of receivers
44
Types of Transmission Media
- Guided Media or Bounded - Unguided Media or Unbounded
45
Signals being transmitted are directed and confined in a narrow pathway by using physical links.
Guided Media or Bounded
46
Is named after the two conductors that run parallel to each other.
Coaxial Cable
47
The transmissions themselves take the form of either electrical pulses or light.
Baseband Mode
48
Uses analog signals in the form of optical or electromagnetic waves over multiple transmission frequencies.
Broadband Mode
49
Most common coaxial standards
- 50-Ohm RG-7 or RG-11 - Thicknet - 50-Ohm RG-58 - Cheapernet - 75-Ohm RG-59 - Television - 93-Ohm RG-62 - ARCNET
50
It is made of pairs of solid or stranded copper twisted along each other.
Twisted Pair Cable
51
is the unintentional transfer of signals from one channel to another channel, creating interference.
Crosswalk
52
Type of cable has the ability to block interference and does not depend on a physical shield for this purpose
Unshielded Twisted-pair
53
Type of cable consists of a special jacket to block external interference.
Twisted Pair
54
It uses the concept of reflection of light through a core made up of glass or plastic.
Optical Fibre Cable
55
The core is surrounded by a less dense glass or plastic covering called the ________.
Cladding
56
Optical Fibre
- Speed - Distance - Bandwidth - Maintenance - Resistance
57
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.
Single Mode Cables
58
Has a larger core diameter that lets multiple modes of light propagate.
Multi-Mode Cables
59
Uses of Fibre Optic Cable
➢ Internet ➢ Cable Television ➢ Telephone ➢ Computer Networking ➢ Surgery and Dentistry ➢ Mechanical Inspections ➢ Military and Space Applications ➢ Automotive Industry
60
No physical medium is required for the transmission of electromagnetic signals.
Unguided Media or Unbounded
61
Types of Unguided media
- Radio waves - Microwaves - Infrared
62
These are easy to generate and can penetrate through buildings. The sendingnand receiving antennas need not be aligned. Frequency Range:3KHz – 1GHz
Radio waves
63
These are majorly used for mobile phone communication and television distribution.
Microwaves
64
It is used for very short distance communication. They cannot penetrate through obstacles. This prevents interference between systems.
Infrared
65
It refers to the communication or transmission of information over a distance without requiring wires, cables or any other electrical conductors.
Wireless Media
66
Types of wireless media
a) Satellite communication b) Infrared Communication c) Broadcast Radio d) Microwave Communication e) Wi-Fi f) Mobile Communication Systems g) Bluetooth Technology

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