Block check character

Last updated November 19, 2025

In telecommunications, a block check character (BCC) is a character added to a transmission block to facilitate error detection.

In longitudinal redundancy checking and cyclic redundancy checking, block check characters are computed for, and added to, each message block transmitted.^[1] This block check character is compared with a second block check character computed by the receiver to determine whether the transmission is error free.

References

↑ Conard, J. (April 1980). "Character-Oriented Data Link Control Protocols". IEEE Transactions on Communications. 28 (4): 445–454. doi:10.1109/TCOM.1980.1094701. ISSN 1558-0857. Transmission of the block continues with data characters until the system defined block length is reached. At this point the station appends the end-of-block sequence ETB BCC or the end-of-message sequence ETX BCC if the block is the last block of a message. The BCC is the block check character, in this case a single LRC character.

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[1] Conard, J. (April 1980). "Character-Oriented Data Link Control Protocols". IEEE Transactions on Communications. 28 (4): 445–454. doi:10.1109/TCOM.1980.1094701. ISSN 1558-0857. Transmission of the block continues with data characters until the system defined block length is reached. At this point the station appends the end-of-block sequence ETB BCC or the end-of-message sequence ETX BCC if the block is the last block of a message. The BCC is the block check character, in this case a single LRC character.

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