Introduction to Networking

Two-Dimensional (2-D) Parity Check

A Two-Dimensional Parity Check is also known as a Longitudinal Redundancy Check (LRC). It is the improved version of the single parity bit.

According to 2-D Parity Check

  • All sending data is placed in the form of rows and columns.
  • For even Parity, bits are calculated for each column, and redundant bits are attached to that column.
  • The block of parity bits of each column acts as redundant bits.


Find the LRC for the sending data blocks 11100111  11011101  00111001 10101001 and determine the data that is transmitted.


Step 01: First, generate LRC bits as given below

Step 02: Now attach LRC with original data and transmit to sender. The block diagram of LRC is given below

Performance of 2-D Parity Check

  • It can detect the burst errors.
  • If two bits are changed in exactly the same column, then errors cannot detected.