Bcc Error Detection Method
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question
Detect Bcc In Email
x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, checksum error detection method helping each other. Join them; it only takes a minute: Sign up Block Check Character (BCC) error burst detection up vote 1 down vote favorite 1 Disclaimer: Not
Crc Error Detection Method
homework! Problem I've been reading up on BCC error detection for my networks course and have got a bit confused over one particular explanation in some of the slides. Given Information We are provided the following explanation: | r |m6 |m5 |m4 |m3 |m2 |m1 |m0 ------------------------------------ error detection method in networking w0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 w1 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 1 w2 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 w3 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 w4 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 ----------------------------------- BCC | 0 | 1 | 0 | 0 vrc error detection method | 0 | 0 | 1 | 0 Let n = row length (n=8 in this case) Remember, not all bits in a burst need be in error, just the first and last BCC copes with (n+1)-bit bursts (9-bit bursts in this case) Question Could someone please explain to me how this is the case/how it works? Example Problem (Seen in a past paper) For example given a diagram as above, how many burst bits can be reliably detected in a block? Explain your answer. Any help greatly appreciated! EDIT: Added reference slide networking error-detection parity share|improve this question edited Jun 10 '14 at 13:59 Johan 48.5k16104201 asked May 7 '12 at 13:13 Peter Hamilton 2,34441942 Peter, can you please post your reference? From your definition above, the maximum burst length is n. BCC is the summation module 2 of all the words (bytes) of your message. If you have an even number of errors in any bit position (column), BCC will not help you identifying an error condition. –guga May 7 '12 at 20:54 @guga I have added the reference slide from my notes. It is literally just this one slide I can't understand and there is nothing very related either side of it. :( –Peter Hamilton May 7 '12 at 22:41 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted Peter, the column r contains the summation module 2 of m0 ... m6, so any odd number of errors in a word is detectable (r is called parity bit). Similarly, each BCC bit is computed by the summation module 2 of the column, that's why BCC is also called longitudinal redunda
checking and cyclic redundancy checking,
Bcc Detector
block check characters are computed for, and block check character example added to, each message block transmitted. This block check character is
Bcc Checksum Calculator Online
compared with a second block check character computed by the receiver to determine whether the transmission is error free. http://stackoverflow.com/questions/10482777/block-check-character-bcc-error-burst-detection This article related to telecommunications is a stub. You can help Wikipedia by expanding it. v t e Retrieved from "https://en.wikipedia.org/w/index.php?title=Block_check_character&oldid=702610520" Categories: Control charactersTelecommunications stubsHidden categories: All stub articles Navigation menu Personal tools Not logged inTalkContributionsCreate accountLog in https://en.wikipedia.org/wiki/Block_check_character Namespaces Article Talk Variants Views Read Edit View history More Search Navigation Main pageContentsFeatured contentCurrent eventsRandom articleDonate to WikipediaWikipedia store Interaction HelpAbout WikipediaCommunity portalRecent changesContact page Tools What links hereRelated changesUpload fileSpecial pagesPermanent linkPage informationWikidata itemCite this page Print/export Create a bookDownload as PDFPrintable version Languages Add links This page was last modified on 31 January 2016, at 17:20. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. Privacy policy About Wikipedia Disclaimers Contact Wikipedia Developers Cookie statement Mobile view
detect all the single errors, double errors and burst errors up to http://gmrt.ncra.tifr.res.in/gmrt_hpage/Users/doc/WEBLF/LFRA/node236.html 16bits in length and can also detect 99% of burst errors of lengths greater than 16bits. The way this works is as follows. A cyclic code message consists of a specific number of data bits and a Block Check Character (BCC). Let equal the total number of bits error detection in the message, equal the number of data bits, i.e. is the number of bits in the BCC. The code message is derived from two polynomials which are algebraic representations of two binary words, the generator polynomial and the message polynomial . The generator polynomial is a type error detection method of code used in CRC-12, CRC-16 and CRC-CCITT. For example, bits of binary data can be represented as a message polynomial of degree . Thus, an eight-bit long message is represented as (24.3.1) The code message can be constructed as follows: Multiply the message by where is the number of bits in the BCC. Divide the resulting product by the generator polynomial . Disregard the quotient and add the remainder to the product to get the code message polynomial , which is represented as . The division is performed in binary without carries or borrows. The code message is transmitted as binary data and the receiver at the other end retrieves the message using the same generator polynomial and accepts the data if the remainder is zero. Next: Signal Modulation Up: Signal Flow in the Previous: Signal Flow in the Contents NCRA-TIFR