The CCITT, considering that it would be useful to have a common standard for assessing the quality of telegraph communications, that the character error rate [1] of a telegraph communication would be suitable for this purpose; that a defined error rate objective should be established; that all forms of current wideband transmission techniques have intrinsic characteristics that make some errors economically unavoidable;
ITU-T F.10 FRENCH-1993 history
1993ITU-T F.10 FRENCH-1993 CHARACTER ERROR RATE OBJECTIVE FOR TELEGRAPH COMMUNICATION USING 5 - UNIT START-STOP EQUIPMENT