|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: crc-32QSanjay, Please have a look at http://www.haifa.il.ibm.com/satran/ips/draft-sheinwald-iSCSI-CRC-00.txt The reference (a paper by Jack Wolf from 1994) has this polynomial as the best performing between those explored and 4 orderds of magnitude better on bursts longer than 32 bits. Given the stature of the author and the fact the the polynomial is quoted in several papers we did not check that after division by x+1 the polynomial is irreducible. CCITT-CRC32 is x^32+x^31+x^4+1 (our previous choice) We are looking now at several other codes. IEEE802 hex 104C11DB7 - the one you quoted is among them but there are several more promising. Julo Sanjay Goyal <sanjay_goyal@ivivity.com> on 02/03/2001 03:11:55 Please respond to Sanjay Goyal <sanjay_goyal@ivivity.com> To: ips@ece.cmu.edu cc: Subject: crc-32Q Hi the generator polynomial for the crc-32Q (32 31 24 22 16 14 8 7 5 3 1 0) as given in Appendix A is reducable, as I tried it on the internet on a CRC-calculator tool. The ethernet polynomial which is (32 26 23 22 16 12 11 10 8 7 5 4 2 1 0) is not reducable. Now as per my understanding reducable polynomial is not better than the irreducable one. If reducable one is not good, why did we choose crc-32Q polynomial instead of crc-32 polynomial(used for ethernet)? Can somebody please explain it to me. Regards and Thanks Sanjay Goyal
Home Last updated: Tue Sep 04 01:05:28 2001 6315 messages in chronological order |