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# Topic: Cyclic redundancy check

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 Cyclic redundancy check - Wikipedia, the free encyclopedia A cyclic redundancy check (CRC) is a type of hash function used to produce a checksum- which is a small, fixed number of bits - against a block of data, such as a packet of network traffic or a block of a computer file. To check the CRC, instead of calculating the CRC on the message and comparing it to the CRC, a CRC calculation may be run on the entire codeword. If the result is zero, the check passes. en.wikipedia.org /wiki/Cyclic_redundancy_check   (2117 words)

 Cyclic Redundancy Check (CRC) Cyclic Redundancy Checking is an error detection method that performs a math algorithm on a bitstream of data and calculates a finished value from it. CRC checking is very fast because it performs a mathematical calculation as opposed to a lookup or crosscheck. CRC checking is used in Telecom circuits over microwave and dedicated lines and is used in ATM, Digital Signalling, Ethernet, FDDI, Token Ring and many other protocols. www.inetdaemon.com /tutorials/theory/concepts/cyclic_redundancy_checking.shtml   (160 words)

 CRC - Cyclic Redundancy Check Cyclical Redundancy Check - A method of detecting errors in a message by performing a mathematical calculation on the bits in the message and then sending the results of the calculation along with the message. The Cyclic Redundancy Check to verify the correctness of data. The data integrity of a received frame or packet is checked via a polynominal algorithm based on the content of the frame, and then matched with the result that is performed by the sender and included in a (most often 16-bit) field appended to the frame. www.auditmypc.com /acronym/CRC.asp   (717 words)

 Command Understanding Cyclic Redundancy Check This technical note describes Cyclic Redundancy Check (CRC) in detail and shows an implementation of CRC within 4th Dimension. The advantage of a CRC is that it is virtually impossible for a random change in a block of data to still generate the same checksum. CRC arithmetic is referred to in the mathematical world as "polynomial arithmetic modulo two". www.4d.com /docs/CMU/CMU79909.HTM   (2664 words)

 cyclic redundancy checking - a Whatis.com definition - see also: CRC Cyclic redundancy checking is a method of checking for errors in data that has been transmitted on a communications link. In Europe, CRC-4 is a multiframe system of cyclic redundancy checking that is required for switches on E-1 lines. A sending device applies a 16- or 32-bit polynomial to a block of data that is to be transmitted and appends the resulting cyclic redundancy code (CRC) to the block. whatis.techtarget.com /definition/0,,sid9_gci213868,00.html   (327 words)

 CRC - Cyclic Redundancy Check To check that CRC, the received frame is divided by the divisor. CRC is used to detect errors in transmissions over Ethernet and from CDs. CRC codes are also known as polynomial codes. www.andrew.cmu.edu /user/taon/CRC.html   (183 words)

 cyclic redundancy check from FOLDOC (CRC or "cyclic redundancy code") A number derived from, and stored or transmitted with, a block of data in order to detect corruption. A CRC is more complicated than a checksum. CRCs are then computed using an input byte to select a 16- or 32-bit value from the table. www.instantweb.com /foldoc/foldoc.cgi?cyclic+redundancy+code   (301 words)

 cyclic redundancy check "cyclic redundancy check", from Dictionary of Algorithms and Data Structures, Paul E. Black, ed., NIST. Many transmission errors may be detected, and some corrected, by recalculating the CRC and comparing it with the transmitted CRC. If the CRCs match, there is a small chance that the blocks are actually different. www.nist.gov /dads/HTML/cyclicRedundancyCheck.html   (166 words)

 CRC Algorithm The remainder from this division is the CRC. When the recipient calculates the CRC for this sum, and there was no transmission error, he will get zero. First calculate the CRC for a message to which you have appended 32 zero bits. www.relisoft.com /Science/CrcMath.html   (1039 words)

 Cyclic Redundancy Checks The transmitter sends both the message string M and the check word r, and the receiver can then check the data by repeating the calculation, dividing M by the key word k, and verifying that the remainder is r. By the way, this method of checking for errors is obviously not foolproof, because there are many different message strings that give a remainder of r when divided by k. The basic idea behind CRCs is to treat the message string as a single binary word M, and divide it by a key word k that is known to both the transmitter and the receiver. www.mathpages.com /home/kmath458.htm   (2682 words)

 Cyclic Redundancy Check When the CRC is appended to the end of the data (thus eliminating the need to detect it as a separate field), and if bit-level CRC hardware is also to be supported, CRC software may need to use data in reverse bit order. If a MSb-leftmost CRC routine is to be compatible with bit-level CRC hardware, it may be necessary to reverse the bit order of every data byte (before each is processed or serialized) and also the CRC remainder bytes (after the block ends). If the CRC result is simply attached to the end of the data, the receiving CRC register will clear itself automatically if there is no error; that is, each bit of the stored or transmitted CRC value should cancel the similar bit in the CRC register. home.mweb.co.za /vt/vtondrjc/InDyn/Tech/Fmt/crcRitter.htm   (9273 words)

 Cyclic Redundancy Check - Digital Video Forums The data errror (cyclic redundancy check) is caused by a dirty disc. i get cyclic redundancy check errors all the time on my cds, and if you cant fix it by cleaning the disc then very often the cd is worthless. The "Data Error(Cyclic Redundancy Check)" this is a read error. forum.digital-digest.com /showthread.php?t=19342   (596 words)

 Cyclic Redundancy Check error - Neowin.net Cyclic Redundancy Check error with the file name in front of it... I got the Cyclic Redundancy Check error once on my computer... The CRC check you speak of is a kind of checksum check. www.neowin.net /forum/index.php?showtopic=309335   (516 words)

 Math Forum - Ask Dr. Math Date: 06/26/2002 at 19:22:41 From: S.H. Subject: Cyclic Redundancy Check I have been studying CRCs for several days now and I understand perfectly HOW they work. Date: 06/28/2002 at 04:01:25 From: Doctor Jeremiah Subject: Re: Cyclic Redundancy Check Hi there! The CRC could be just as easily computed without the zeros and even divisibility would still be preserved by adding the CRC back to the message string; in fact, it seems that appending the zeros makes for more work. mathforum.org /library/drmath/view/60915.html   (651 words)

 Cyclic Redundancy Check (CRC) The CRC is one of the most used techniques for error detection in data communications. The CRC is a very powerful but easily implemented technique to obtain data reliability. The CRC technique is used to protect blocks of data called Frames. www2.rad.com /networks/1994/err_con/crc.htm   (97 words)

 Cyclic Redundancy Check Simulation This model demonstrates sending a message using Cyclic Redundancy Check (CRC). To refer to this model in academic publications, please use: Barchet, C. and Carrigan, T. Cyclic Redundancy Check Simulation Blackburn College, Carlinville, IL. CRC is a commonly used error detection technique. www.frontiernet.net /~prof_tcarr/CRC/CRC.html   (738 words)

 Emuforums.com - Cyclic redundancy check??? Finalising the disc is nothing to do with checking disc integrity, it's for preventing anymore data being written to a multi-session disc. This means the built-in error checking noted a bad block of data. Due to the nature of CRC, if you have low-level access, you can attempt to reproduce what the CRC thinks the value should be... forums.ngemu.com /software-discussion/53866-cyclic-redundancy-check-print.html   (1163 words)

 Data error - cyclic redundancy check. What it means for your data, CD and DVD discs If something goes wrong with the data between the time it leaves the source and arrives at its destination, the CRC sent at the source will no longer match the one that is calculated when the data arrives - this is when the cyclic redundancy check error will appear. If you have lots of zip files on your system and want to check they are still valid, get a copy of CRC Checker - it's free and can validate zip or rar files in batches - which is much easier than doing it one at a time. In simple terms, a CRC is bit of mathematics used to ensure that your data is OK when being transfered. www.softwarepatch.com /tips/cyclic-redundancy.html   (590 words)

 The Cyclic Redundancy Check One widely used parity bit based error detection scheme is the cyclic redundancy check or CRC. This last fact is the basis of error checking using the CRC. Any particular use of the CRC scheme is based on selecting a generator polynomial G(x) whose coefficients are all either 0 or 1. www.cs.jhu.edu /~scheideler/courses/600.344_S02/CRC.html   (1456 words)

 Cyclic Redundancy Check - CRC Short for Cyclic Redundancy Check, CRC is a method of detecting errors in data transmission. A CRC is data that is sent with a block of data, that when received by where the information is being sent to, the CRC can be used to verify if data was all received correctly. Additional information and help with what causes a CRC error can also be found on document CH000430. www.computerhope.com /jargon/c/crc.htm   (78 words)

 LostCircuits, Tech Advice Guide Cyclic Redundancy Checking (CRC) was introduced originally with SCSI Ultra160 technology to improve data integrity. CRC allows error detection on both the protocol and the interconnect layer. Statistically, the efficacy of CRC error detection is such that at a constant 100 MB/sec a triple error would slip through the detection scheme every 4.7 * 10^18 years, about 1 million times the existence of our solar system from origin to black hole. www.lostcircuits.com /advice/sata150/9.shtml   (474 words)

 Cyclic Redundancy Check Cyclic Redundancy Check, in layman's terms, is what a computer uses for data security. When I went to copy backup files over, I got two different errors, one was a "Cyclic Redundancy Check" the other was "cant read from the source or disk". I did a google on the Cyclic Redundancy Check but none of the stuff helped. www.pro-networks.org /forum/about50016.html   (780 words)

 Cyclic Redundancy Check Error - Doom9's Forum I got this cyclic redundancy check error with the movies Hitch and XXX State of the Union, but DVD Decryter took care of them. Get a Cyclic Redundancy Check Error during the analysis phase of DVD shrink at 56% with DVD Elektra. Last time i had this error it was my poor old hard drive kicking the bucket, 1 week later i lost every piece of data on it, and recovery was impossible to the sheer low speed of the drive. forum.doom9.org /showthread.php?t=99465   (321 words)

 "cyclic redundancy check" DVD Shrink is no longer updated by the Author, and any CRC redundancy check problems I have had have been resolved by using DVD Decrypter, then DVD Shrink to fit decrypted movie on single layer DVDR. I had a "redundancy error" with my reader drive on every disc, so I ended up replacing it, it was a Lite=On drive that came with my computer, I replaced it with the same brand an it works fine, now. Used Xcopy for the single layer and DVD Decrypter for the dual layer, more than likely BrucePa your errors are caused by some imperfection in your original. forums.afterdawn.com /thread_view.cfm/209447   (940 words)

 The cyclic redundancy check This method, known as the polynomial code or, the cyclic redundancy code, treats the data as a representation of polynomial equation and uses polynomial arithmetic to detect errors In practice the a more advanced error detection mechanism is used www.cs.may.ie /~johnmcd/cs320/lecture_notes/3.DataLink/sld024.htm   (39 words)

 Obsidian Forum Community -> Cyclic Redundancy Check a cyclic redundancy check (CRC) (edit: oops, wrong definition, i'm typing ahead of my thinking)... once the last bit is stuffed into the pipe is the CRC value, attached to the end of the data stream as a word (two bytes, perhaps, for a 16-bit CRC). correct definition: a CRC is generated by sending a data stream, bitwise, through a linear feedback shift register (LFSR) configured with certain tap outputs XOR'd together. forums.obsidianent.com /index.php?showtopic=30512   (766 words)

 crc16 - Cyclic Redundancy Check (crc16) This package provides a Tcl-only implementation of the CRC algorithms based upon information provided at http://www.microconsultants.com/tips/crc/crc.txt There are a number of permutations available for calculating CRC checksums and this package can handle all of them. The first is the data to be checksummed and the second is the seed value. The CRC of the previous member can be used as the seed for calculating the CRC of the next member. www.tcl.tk /community/tcl2004/Tcl2003papers/kupries-doctools/tcllib/modules/crc/crc16.man.html   (251 words)

 Relic Forums - Cyclic redundancy check CRC is a method to check the integrity of a file, ie if it was altered in some way. Check the back for dust and scratches, or if it's downloaded, re-download. A CRC error mean that the file itself is corrupt/changed in some way. forums.relicnews.com /showthread.php?t=16107   (214 words)

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