2.2 Error Detection Methods

Error Detection Methods

Ensuring Data Accuracy

Transmission can be affected by interference. We use these methods to spot errors:

  • Parity Check: Uses an extra bit (Parity Bit) to make the total number of 1s in a byte Even or Odd.
  • Checksum: A value calculated from the data. If the received checksum doesn't match the calculated one, the data is corrupt.
  • Check Digit: Specifically used for human entry (e.g., Barcodes/ISBN). It is the final digit calculated from all previous digits.
Concept Diagram
Figure 2.2.4: Error Detection Methods