Brother International MFC 3420C Users Manual - English - Page 30

ECM (Error Correction Mode) The Error Correction Mode (ECM) is a way for the MFC to check a fax transmission while it is in progress. If the MFC detects errors during fax transmission, it resends the pages of the fax that had an error. ECM transmissions are only possible between fax machines that both have this feature. If they do, you may send and receive fax messages that are continuously being checked by the MFC. Your MFC must have enough memory for this feature to work. Connecting the MFC Connecting an external telephone If your MFC does not have a handset, you can connect a separate telephone (or telephone answering device) directly to your MFC as shown in the diagram below. Connect the modular plug on the telephone line cord to the jack labeled EXT. in the back of the MFC. Extension Telephone External Telephone When this phone (or TAD) is in use, the LCD shows Telephone. INTRODUCTION 1 - 9