Bits, bytes and storage and Packets

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Bits, bytes and storage and Packets

• How is information stored?

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Bit

• A bit (binary digit) an electrical
  charge-similar to a light. It is either on or
  off.
• When writing this on paper 1 mean 'on' and 0
  means 'off'

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Byte

• A byte is a group 8 bits.
• Kilobyte (KB) 210 (1,000) bytes
• Megabyte (MB) 220 ( a million) bytes
• Gigabyte (GB) 230 ( a billion) bytes

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Bytes and Text

• A byte can represent one character in a text
  file.
• One light has two possible signals on or off
• Two lights have four
• on on on off
• off on off off

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Doubling of signals

• Each additional light will double the amount of
  possible signals. Suppose we know the four
  signals for 2 lights. We simple use those with
  the third light on and repeat with the third
  light off.
• 3 lights 8 signals
• on on on on on off
• on off on on off off
• off on on off on off
• off off on off off off

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Powers of 2
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ASCII Table