Data transmission Flashcards

1
Q

Bit

A

Short for binary digit, it is the smallest unit of data in a computer.

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2
Q

Bit rate

A

The rate at which data is transferred.

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3
Q

How the data are transmitted?

A

The transfer of data occurs either wirelessly by radio waves or over a cable.

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4
Q

Serial transmission

A

Use a single wire to transfer bits of data.

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5
Q

Parallel transmission

A

Uses a multiple wires to transfer bits o data

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6
Q

Interference

A

Disturbances that can occur in the signals when sending data that may corrupt it.

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7
Q

Serial transmission properties

A
  • used over long distances
  • used a single wire
  • reduced costs
  • slower transmission as only one bit at a time
  • safer transmission as one bit is send at a time
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8
Q

Parallel transmission properties

A
  • used over a short distances
  • uses multiple of wires
  • increased cost
  • quicker transmission
  • less safe as bits are send in parallel
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9
Q

Simplex transmission

A

Sending data in one direction only at time.

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10
Q

Full duplex transmission

A

Sending data in both direction at the same time.

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11
Q

Half-duplex transmission

A

Sending data in both directions but only one direction at time.

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12
Q

Checksum

A

Method of error detection. The number of bits is counted up and the receiver can check, if same number of bits it received.

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13
Q

Parity check

A

Method for error detection. The devices that the data is being transferred between will be set to check for even parity or odd parity before the data is sent.

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14
Q

Automatic repeat request

A

Is a set of rules for error control when transmitting data. When the device detects that there is an error, it will automatically sends a request to resent the packet.

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15
Q

USB

A

Universal serial bus. Transmits data much faster than parallel transmission. It is more expensive than parallel.

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16
Q

IC

A

Integrated circuit. It uses parallel transmission. It is cheap, simple and fast. Used mainly in microprocessors.

17
Q

HTML

A

Hypertext markup language. Consists of the content to be displayed and instructions on how to interpret the content.

18
Q

Mark-ups

A

Instructions on how content is formatted, structured and displayed by the browser.

19
Q

By separating the style form the content…

A

the style can be easily changed without changing the content.

20
Q

CSS

A

Cascading style sheet, which specifies the presentation. Separated document where styling mark-up instructions are placed. This sheet can be then applied to any HTML document.