The zero error capacity is defined for infinite length codes, none of which are usable in practice. Another way to see it - care to list any error code used an

The zero error capacity is defined for infinite length codes, none of which are usable in practice. Another way to see it - care to list any error code used anywhere with zero error rate? Read the paper. Shannon write about this in his 1956 paper and subsequent work analyses further, but it's theoretical, and probably not practical for any real world error codes.