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Data Communication Flashcards

(77 cards)

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1
Q

What is meant by data communication?

A

Data communication is a transmission of data from one place to another using electronic means.

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2
Q

How is data transferred in data communication?

A

Data is transferred through transmission medium such as cable wireless system micro system satellite system etc.

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3
Q

Data communication system may consist of __________ and ______________.

A

Hardware and software

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4
Q

How is data transmitted from one system to another system

A

Data is transmitted electronicly.

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5
Q

Data communication between computer to the internet?

A

Tere communication between computer and internet would be computer connecting to the internet using a dam in which uses establish a communication between a pc and hundreds of computers on the internet

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6
Q

How is data transmitted in telecommunications ?

A

In telecommunication there is a mix of both data (digital) and voice (analogue)

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7
Q

Define data

A

Raw fox and figures given to the computer as an input is called data.

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8
Q

What is information?

A

Process to form of data.

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9
Q

In what forms does data exist?

A

Data can be in the form of text numbers graphics sounds and videos.

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10
Q

By what method data is more convenient to move out process in data communication?

A

By translating into a form that is convenient

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11
Q

Define data transmission?

A

Process of transporic data between two or more devices

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12
Q

What is the signal?

A

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

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13
Q

What is the other name of data transmission?

A

Digital transmission

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14
Q

What are transmission media

A

Mediums through which data send or received such as cables or wireless media like microwave infrared and satellite

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15
Q

Name types of waves

A

Mechanical waves (sound) requires medium
Electromagnetic waves require no medium (light)

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16
Q

What are analogue signals

A

Continue signals that vary overtime

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17
Q

What is analogue data transmission

A

Transfer of data from one place to another in the form of analogue signals that transfer voice data over telephone line.

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18
Q

What is used in analogue signal instead of on and off

A

Variations between the Waves

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19
Q

Examples of analog signals

A

Light waves, sound waves, radio waves

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20
Q

In continuous way there is a _______ and _______ values

A

High and low

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21
Q

What exist between high and low values

A

Variety your values in continuous wave

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22
Q

Disadvantage of analogue signals

A

They are prone to impairments over a distance

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23
Q

What are digital signals

A

I discrete signals that used binary values to represent data and are discontinuous

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24
Q

What does one and zero mean

A

One means on why zero means off

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25
What does digital signal transmit
It transmits binary data based on 2 digits
26
How does computer except and process data
In digital form
27
How does duster signal perceive information
It passes information as a string of impulses
28
What is low pulse and high pulse
Low pulse or no pulse indicate zero while high pulse it detects 1
29
What does a modem do
Madam converts analogue signals to digital signals and vice versa
30
On a destal image what are pixels represented as
Pixels are represented as on and off and combined together to create this till images
31
List components of a communication system
Sender Receiver Message Protocol Transmission medium
32
What is the sender
Device or person that sends data
33
Other names of sender
Transmitter or source
34
What is the receiver
It is a device that receives data
35
Other names of receiver
Sink or destination
36
What is message
The actual data being transmitted
37
What is the protocol
Sarproof that govern data communication
38
What does protocol represent
Agreement between communicate and devices
39
What will happen without a proper protocol
Devices maybe connected but they cannot communicate with each other
40
What does protocol include
Error detection synchronization signaling and authentication in communication system.
41
Define transmission medium
Path through Which message is transmitted
42
What is feedback
Important components of communication system that help centre to analyse and confirm the correct interpretation of message by the receiver
43
List properties of a good communication system
Delivery accuracy and timelines
44
What is meant by delivery
It means that the send data should be delivered to the receiver
45
What is meant by accuracy
Receive data must be exact to the send data
46
What happens to altered data
Alter data in transmission and left uncorrected are unusable
47
What must happen if there is any error during data transmission
Data must be retransmitted
48
Explain timelines
It means that the data sent must be delivered in time
49
What happens if data is late
If the data is transmitted late then the data become useless
50
What is jitter
Property of the communication system that refers to the variation in the packet arrival time
51
Name modes of data communication
Synchronous and asynchronous
52
What is synchronous data transmission
Transmission of data as a continuous stream typically in blocks all frames without any gaps
53
Define asynchronous transmission
Method by data is sent bite by bite and each bite is sent individually with intervals
54
How is data transmitted in synchronous data transmission
Data is transmitted block by block or word by word
55
What special device is used in synchronous transmission
Synchronised clock is required to schedule the transmission of information
56
In what way is data transmitted with synchronous transmission
Large blocks of piles are transmitted at regular interval without any start stop signals
57
What is the requirement of synchronous transmission
The sending and receiving devices must be synchronised
58
Compare cost of synchronous and asynchronous transmission
Synchronous transmission requires expensive equipment while a synchronous transmission maybe cheaper
59
List advantages of synchronous transmission
It was greatest speed and accuracy
60
Other name of asynchronous transmission
Start stop transmission
61
Why is it called start / stop transmission
Because communication can start anytime and stop anytime
62
How is data sent in asynchronous transmission
Did a sentence small independent chunks
63
What is parity
Additional bed included at the end of each by two allow error checking
64
How is a receiver alerted
To alert the receiver about arrival of new bite and extra bit zero called start with is added at the beginning of each group of bits and one cold stop bit is appended at the end of each byte
65
Can timing be used in acrony transmission
Tere Siva cannot use the timing as it has no knowledge me the next bite will arrive
66
What is the speed of asynchronous transmission
It is lower and in efficient than synchronous
67
Advantage of a synchronous transmission
Simple to implement and is ideal for scenarios were data is regularly transmitted
68
List properties of asynchronous transmission
Start and stop bitch are used to identify when data begins and ends No synchronisation is required Lower efficiency due to start and stop bits
69
How is error checked
Asynchronous transmission and checks error bite
70
What transmission mods are used in real time data transmission where minor delay is not acceptable
Isochronous
71
Name types of transmission medium
Guided media and unguided media
72
What is guided media
Guided media uses physical path to transmit signals
73
What is unguided media
Undered media transmit signals through air without any physical path
74
Other name of guided media
Wired communication are boundary transmission media
75
What is other name of unguided media
Wireless communication or unbounded transmission media
76
Which media provides direction to the signal
Guided media
77
List different guided medias
Twisted pack cable coaxial cable and fiber optic cable

Computer (3 decks)

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