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Computer Studies - Data Transmission > Types and Methods > Flashcards

Types and Methods Flashcards

1
Q

what is data transmission?

A

centre of all digital communication

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2
Q

why is breaking down data into chunks necessary?

A

allows data to be transmitted faster from the sender to the reciever

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3
Q

what is a data packet

A

small unit of data that can be transmitted from sender to receiver through a network communication protocol

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4
Q

what is the structure of a packet

A

header, payload, trailer

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5
Q

what does the header do and what does it contain

A

information is used by routers to determine source and destination of packet. Contains: sender’s IP address, reciever’s IP address, packet number

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6
Q

what does the header do and what does it contain

A

information is used by routers to determine source and destination of packet. Contains: sender’s IP address, reciever’s IP address, packet number

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7
Q

what does the payload do and what does it contain

A

carries the actual data. contains: data/part of message

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8
Q

what does the trailer do and what does it contain

A

tells receiver that the end of the packet has been reached. contains: bits to shows end of packet

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9
Q

advantages of packet switching

A

take different routes, transmission errors can be detected

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10
Q

disadvantages of packet switching

A

packets may be dropped if they reach their TTL

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11
Q

what factors determine which method is best for transmitting each piece of data

A

number of bits, number of wires, direction of data

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12
Q

what is serial transmission

A

one single wire is used to connect, bits are transmitted one at a time

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13
Q

advantages of serial

A

more reliable over long distance. bits arrive in order so wont be mixed up, chances of bits being lost is slim

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14
Q

what is parallel transmission

A

multiple wires are used to connect the sending device and the receiving device, several bits sent at a time

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15
Q

advantages of parallel

A

faster than serial

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16
Q

disadvantages of parallel

A

bits may arrive out of order, expensive method to implement over longer distance because it requires multiple wires

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17
Q

disadvantages of series

A

slow

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18
Q

What does USB stand for

A

universal serial bus

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19
Q

what type of transmission does USB use

A

serial

20
Q

devices that use USB cables to transfer data

A

digital cameras, keyboards and printers, and most external storage devices

21
Q

why is USBC better than USB

A

because data is transferred in both direction instead of one

22
Q

what is USB

A

communication interface that has become a standard for connecting devices to their parent or host controllers

23
Q

advantages of USB

A

it is universal, transfer power too,

24
Q

disadvantages of USB

A

multiple different cables

25
Q

What method does USB implement

A

asynchronous

26
Q

how many pins is the USB composed of

A

4 (two for connecting wires that transmit data and two for connecting wires that carry the power

27
Q

step by step of connecting USB to computer

A

device is detected due to change in voltage lines, speed type and configuration are determined, computer loads driver, computer prompts user to install driver if not already available

28
Q

benefits of USB

A
  • once plugged in, device drivers install automatically (sell configuration)
  • connectors can only be connected in one way which ensure user connects it in the right manner (avoid damage)
  • transmission rates are supported
  • newer USB connectors are compatible with older USB standards
29
Q

methods for error checking

A

automatic repeat request (ARQ), echo check

30
Q

how does ARQ wrok

A

acknowledgment detects whether transmission is correct or not. If not data is resent until time out is reached

31
Q

what is acknowledgment

A

message sent by receiver to sender indicating data has come through. A positive acknowledgement suggests that transmission was completed without error, while a negative acknowledgement indicates that transmission had some errors

32
Q

timeout

A

time allowed to elapse

33
Q

how does echo check work

A

data sent from sender to reciever and data received is sent back to sender. compares sets for transmission

34
Q

error free transmition includes

A

direction, method of transmition, method of syncropnization

35
Q

direction can be

A

simplex, half duplex or full duplex

36
Q

transmission can be

A

series or parallel

37
Q

synchronization can be

A

synchronous or asynchronous

38
Q

what is simplex

A

one sending to another, onedirection

39
Q

what is half duplax

A

two diretion but only one at a time

40
Q

what is full duplex

A

two direction at the same time

41
Q

synchronous transmission

A

a continuous and consistent timed transfer of data blocks. These types of connections are used when large amounts of data must be transferred very quickly from one location to the other.

42
Q

asynchronous transmission

A

the transmission of data in which each character is a self-contained unit with its own start and stop bits and an uneven interval between them. Asynchronous transmission is also referred to as start/stop transmission

43
Q

example of simplex

A

keyboard, monitor

44
Q

example of half duplex

A

walkie talkie

45
Q

example of full duplex

A

telephone

Computer Studies - Data Transmission (3 decks)

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