The Modified Read Code (MRC) is a data reduction method that reduces the transmission time forfaxes
. The MRC method dates back to the 1980s when transmission rates were still relatively low and fax modems
were used.The MRC procedure was also called Modified Modified Read (MMR) and is used in fax group 4 devices. In addition, the MRC code is also
used in the Open Document Architecture
(ODA). The compression rate is between 10 and 50 and depends on the information content of the fax page.