| Type | Description | Example Use |
|---|---|---|
| Check Digit | The last digit of a sequence used to check all other digits are correct and in the correct order | Barcodes |
| Automatic Repeat Request (ARQ) | Used to check that data has been successfully sent by waiting for an acknowledgement of receipt | Email Account Confirmation |
| Checksum | A calculated total of other data sent used to detect changes in bits during transmission | Used for Downloading Installation File |
| Parity Check | Used to make the total number of 1s sent either even or odd | Checking Odd Paritys |
Parity Check
A parity check uses a parity bit to make sure that the data has been sent accurately. Data is sent in bytes, normally made up of 8 bits. In a parity check, the first 7 bits of the byte are the data itself, the last bit is the parity bit.
Odd Parity
01001010
11010011
Even Parity
11011011
10101010
In what situation could Parity Checks fail?
If you send two sets of data at once, the Parity Check will fail.
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