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Data Transfer

Data Transfer. Prelimnaries: data is not always sent in a whole chunk. Often (esp long distances, like internet) it is split up into PACKETS. ‘Information’ about the data being sent is also sent at the front – a ‘header’. Error checking methods

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Data Transfer

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  1. Data Transfer Prelimnaries: data is not always sent in a whole chunk Often (esp long distances, like internet) it is split up into PACKETS ‘Information’ about the data being sent is also sent at the front – a ‘header’

  2. Error checking methods When data is sent, checks are made on it. If the check doesn’t match up for a packet, it is re-transmitted e.g. Checksum Total = 551 551 23 14 121 56 11 5 103 72 34 112 Total = 557 551 23 14 121 56 14 8 103 72 34 112 e.g. Parity bits a 0 or a 1 to make the no of 1’s even (even parity) or odd (odd parity) 10110101110101100 1 . parity bit

  3. Protocol • This is an agreed format in which the data will be transmitted. • It will in clude aspects such as • what error correction method is used • how many byte per packet • what compression algorithm is used • what bit pattern will indicate the end of transmission • lots of other stuff!

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