We using crc algorithm to detect errors , and we send with our message crc code , but what happened if an error occurre when we send it ? And how we detected?
I try nothing to do , but i guess that we will not get a 0 in the reciver,
Errors in the appended CRC are detected in the same way, with the same efficacy, as errors in the message.
The combined message+CRC is a codeword, which has some minimum distance, measured in the number of flipped bits, to nearby codewords. One less than that distance is the number of erroneous bits that can be assuredly detected.