Error detection and correction

1. network must be able to transfer data from one device to another device with a full
2. a system which can not guarantee the data received with data that is sent is useless
3. many factors that can cause data changed or deleted
4. system that can be in the trust (reliable system) must have menakisme to detect and correct data errors.


Type - type of error in data transmission
- Single bit
- Burst



Single bit error
Error only occurs in one bit.
Example:
In sending the letter A character
Letter A has a hex code 41 in binary code mean 0100 0001


Burst error
errors occur in more than one bit



Error detection

Error detection using the concept of redundancy is adding extra bits to detect an error when we get are geared toward.



Kinds of error detection method



VRC : vertical redundancy check (parity check)

LRC : longitudinal redundancy check

CRC : cyclical redundancy check