This attribute counts the number of errors found by the decoder.
The errors could be any of the following:
1.Receipt of STEPUP (step up codeword size) codeword when it
would cause C2 (current code word size) to exceed N1 (maximum
code word size).
2. Receipt of a codeword, at any time, equal to C1 (next empty
dictionary entry).
3. Receipt of a codeword representing an empty dictionary entry.
4. Receipt of a reserved command code.
5. Receipt of any other error.
The counter wraps when it exceeds the maximum value.
The action taken by V.42bis on detecting any of these errors is
provisioned via TdmaCs/* V42bis.