Transverse redundancy check
The vertical redundancy check (English vertical redundancy check, thus often VRC or vertical parity checking), a method for error detection by means of parity bit ( also referred to as parity bit ) in the case of digital data transmission.
At each data word an extra bit ( parity bit ) is added so that parity is created. That is, the cross- sum of the individual bits of the data word, an even ( even parity ) or uneven (uneven parity) must equal number. Thus, in the data transfer 1-bit error can be detected. If two bit errors at the same time, this can not be detected by parity check method. The following example shows some 8- bit data words with appended parity bit ( shown in red ) to produce the same parity:
11011101 | 0 ( sum of digits: 6) 10111001 | 1 ( cross- Total: 5) 00110011 | 0 ( cross- Total: 4) see also
- Longitudinal Redundancy Check
- Cyclic Redundancy Check
- Digital technology
- Technical computer science