Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Single bit header error correction in ATM Specific TC
> you are correct in noting that i was assuming random independently > distributed bit errors. but clumps of errors should be detectable > by the crc generator polynomial if it is reasonably specified. Sorry. I should have said more... The context of the discussion was correcting errors in the header. You said that if the link had a bit error rate of 10^-7 then there wouldn't be much chance of false corrections. I was trying to say that if the errors come in clumps (which happens in many physical systems) then the probability of false corrections is no longer very low. ----- I think a good N-bit CRC will detect all error patterns where all the bit errors are within a clump of N-1 adjacent bits. (That is you could fix the packet by XORing with an N-1 bit number that was aligned correctly.) Maybe it's N rather than N-1. ----- Does anybody know of any data on the distribution of errors on real links? -- These are my opinions, not necessarily my employers.
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