Transmission-induced scan line errors are one of the important impairments perceived by customers in non-Error Correction Mode (see Recommendations T.4 and T.30) Group 3 facsimile. This proposed text develops a set of scan line related performance metrics that can help benchmark the performance of transmission networks with respect to Group 3 facsimile.
In this text, certain criteria are developed for declaring a received facsimile page Error-Free, Errored, and Severely-Errored. These criteria are based on the number and distribution of errored scan lines and were developed based on customer perception studies of facsimile images.