Vertical Redundancy Check - ορισμός. Τι είναι το Vertical Redundancy Check
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Τι (ποιος) είναι Vertical Redundancy Check - ορισμός

TELECOMMUNICATIONS REDUNDANCY CHECK
Vertical redundancy check; Vertical redundancy checking

Vertical Redundancy Check         
<storage, communications> (VRC) An error checking method performed on one 8-bit ASCII character, where the 8th bit is used as the parity bit. The resulting parity bit is constructed by XORing the word. The result is a "1" if there is an odd number of 1s, and a "0" if there is an even number of 1s in the word. This method is unreliable because if an odd number of bits are distorted, the check will not detect the error. The Longitudinal Redundancy Check is an improvement. (2001-04-28)
Transverse redundancy check         
In telecommunications, a transverse redundancy check (TRC) or vertical redundancy check is a redundancy check for synchronized parallel bits applied once per bit time, across the bit streams. This requires additional parallel channels for the check bit or bits.
cyclic redundancy check         
TYPE OF HASH FUNCTION USED TO DETECT ERRORS IN DATA STORAGE OR TRANSMISSION
Cyclic Redundancy Check; FCS-32; Cyclic redundancy code; CRC16; Crc64; Crc32 mpeg2; Crc16; Cyclic redundancy checks; CRC-24; CRC-16; CRC-8; CRC-64; Cyclical redundancy checking; CRC-CCITT; CRC-12; Crc32c; CRC32c; CRC8; Cyclic redundancy; Cyclic redundancy checksum; CRC-32C; CRC-32K; CRC check; CRC Values; Polynomial representations of cyclic redundancy checks; Polynomial CRC representations; List of CRC polynomials
<algorithm> (CRC or "cyclic redundancy code") A number derived from, and stored or transmitted with, a block of data in order to detect corruption. By recalculating the CRC and comparing it to the value originally transmitted, the receiver can detect some types of transmission errors. A CRC is more complicated than a checksum. It is calculated using division either using shifts and exclusive ORs or table lookup (modulo 256 or 65536). The CRC is "redundant" in that it adds no information. A single corrupted bit in the data will result in a one bit change in the calculated CRC but multiple corrupted bits may cancel each other out. CRCs treat blocks of input bits as coefficient-sets for polynomials. E.g., binary 10100000 implies the polynomial: 1*x^7 + 0*x^6 + 1*x^5 + 0*x^4 + 0*x^3 + 0*x^2 + 0*x^1 + 0*x^0. This is the "message polynomial". A second polynomial, with constant coefficients, is called the "generator polynomial". This is divided into the message polynomial, giving a quotient and remainder. The coefficients of the remainder form the bits of the final CRC. So, an order-33 generator polynomial is necessary to generate a 32-bit CRC. The exact bit-set used for the generator polynomial will naturally affect the CRC that is computed. Most CRC implementations seem to operate 8 bits at a time by building a table of 256 entries, representing all 256 possible 8-bit byte combinations, and determining the effect that each byte will have. CRCs are then computed using an input byte to select a 16- or 32-bit value from the table. This value is then used to update the CRC. Ethernet packets have a 32-bit CRC. Many disk formats include a CRC at some level. (1997-08-02)

Βικιπαίδεια

Transverse redundancy check

In telecommunications, a transverse redundancy check (TRC) or vertical redundancy check is a redundancy check for synchronized parallel bits applied once per bit time, across the bit streams. This requires additional parallel channels for the check bit or bits.

The term usually applies to a single parity bit, although it could also be used to refer to a larger Hamming code.

The adjective "transverse" is most often used when it is used in combination with additional error control coding, such as a longitudinal redundancy check. Although parity alone can only detect and not correct errors, it can be part of a system for correcting errors.

An example of a TRC is the parity written to the 9th track of a 9-track tape.