Definitions for

**"Cyclic Redundancy Check"****Related Terms:**Crc, Error detection, Error detection and correction, Checksum, Hamming code, Fec, Fcs, Error correction code, Forward error correction, Error control, Redundancy, Error correction, Ecc , Error correcting code, Parity error, Febe, Error correction mode, Longitudinal redundancy check, Error checking, Reed-solomon code, Error rate, Lrc, Edc, Bch, Corrupt, Parity checking, Parity, Arq, Bler, Circ, Parity check, Lapm, Bit error rate, Ber, V.42, Esf, Block code, Error-correcting code, Bert, Check bit, Bit error ratio, Ecm, Bit stuffing, Soft error, Bcc, Mode 2, Data integrity, Mode 1, Frame

A test used to confirm that data has been delivered without error. In a data packet, the CRC character is calculated by assigning binary values to blocks of data.

a technique for using overhead bits to detect transmission errors

A type of block error detection code that is generated by a transmitter from the information bits in the digital bit stream. It is inserted into the bit stream by the transmitter so that a receiver may detect errors. 0-9 Outside Plant Outside Plant Track

A mathematical algorithm used to ensure accurate delivery based on the actual contents of the data.

An error detection scheme in which the check character is generated by taking the remainder after dividing all the serialized bits in a block of data by a predetermined binary number. Compare with: block character check, longitudinal redundancy check, and vertical redundancy check.

32-bit scheme (referred to as CRC-32) included in Ultra160 that ensures complete integrity of the transferred data. CRC is guaranteed to detect all single bit errors, any two bits in error, or any combination of errors within a single 32-bit range.

This is a byte added to the end of a data packet that is used to verify the data preceding it is valid. [Section6.3.4

an error correction code that is recorded in each sector of a magnetic disk and used to catch errors in the data

Data stored or transmitted with data to detect corruption. By calculating the CRC data and comparing it to the original data sent, the receiver can detect some types of transmission errors.

An error detecting code in which the code is the remainder resulting from dividing the bits to be checked by a predetermined binary number.

A computational means to detect errors in frames transmitted between devices. The mathematical function is computed at the originating device before a frame is transmitted. Its numerical value is computed based on the content of the frame. This value is compared with a recomputed value of the function at the destination device. Refer also to Frame Check Sequence (FCS).

A very good method of data authentication (much better than the checksum method of authentication)

An error checking technique used to ensure the accuracy of transmitting digital code over a communications channel.

An error-checking procedure for data transmission. The sending device performs a complex calculation, generating a number based upon the data being transmitted, and sends that number to the receiving device. The receiving device performs the same calculation after transmission. If the results match, the transmission succeeds. If the numbers don't match, it means the message was received in an altered state, and the data may be incorrect.

A method of checking for errors in a received packet.

A check sequence that is designed to detect packet transmission errors. The size of the check sequence affects its ability to detect different types of errors and multiple errors.

See CRC.

A calculation used to detect errors in data communications, typically performed using a linear feedback shift register. Similar calculations may be used for a variety of other purposes such as data compression.

A check to ensure that the data in a frame is not corrupted. Bridges and routers perform a CRC on incoming data, and typically discard corrupted frames.

One of the methods used within teletext for providing indication of error-free reception.

verifies that the data sent matches with the received data. CRC is more robust than the simple byte parity checks used in pre-Ultra160 SCSI. Increased data rates and longer cable lengths, among other factors, have resulted in the potential for increased error rates, necessitating the use of CRC.

An error detection scheme whereby a number is derived from a set of data before it is transmitted. Once transmitted, the receiving node recalculates the number and compares it to the value originally transmitted. If the numbers are different, some type of transmission error has occurred.

A mathematical function performed on the contents of an entity that is then included to allow a receiving system to recalculate the value and compare to the original. If the values are different, corruption of the contents has occurred.

a mathematical calculation on a frame or cell that is used for error detection. It is added to the traffic, and the receiver performs the same calculation. If the two CRCs do not match, an error has occurred.

A method of checking data stored on an RFID tag to be sure that it hasn't been corrupted or some of it lost. (See Checksum.) Back to the alphabetical list at the top.

A cyclic redundancy check (CRC) is a type of hash function used to produce a checksum â€“ a small, fixed number of bits â€“ against a block of data, such as a packet of network traffic or a block of a computer file. The checksum is used to detect errors after transmission or storage. A CRC is computed and appended before transmission or storage, and verified afterwards by the recipient to confirm that no changes occurred on transit.