What is the actual effect of a given bit error rate on text?
In this application, text is encoded as 7-bit ASCII characters and the resulting bit
sequence is artificially scrambled with a given bit error rate (BER).
Obviously, a BER of 0.001 (or lower) on textual information makes transmission errors acceptable to the eye.
Notice that, in practice, error correction codes can still be added to encoded bits, to detect and correct such transmission errors.