Brother International MFC-9700 Users Manual - English - Page 28

The receiving fax responds with fax receiving tones-loud, chirping sounds. A receiving fax chirps for about 60 seconds over the phone line, and the LCD shows RECEIVING. If your MFC is set to the FAX mode, it will answer every call automatically with fax receiving tones. Even if the other party hangs up, your MFC continues to send the "chirps" for about 60 seconds, and the screen continues to show RECEIVING. The fax "handshake" is the time in which the sending machine's CNG tones and the receiving machines "chirps" overlap. This must be for at least 2 to 4 seconds, so the fax machines can understand how each is sending and receiving the fax. The handshake cannot begin until the call is answered, and the CNG tones last for only about 60 seconds after the number is dialed. Therefore, it's important for the receiving MFC to answer the call in as few rings as possible. When you have an external telephone answering device (TAD) on your fax line, your TAD will determine the number of rings before the call is answered. Pay special attention to the directions for connecting a TAD to your MFC in Chapter 2, Assembly and Connections. ECM (Error Correction Mode) ECM is a way for the MFC to check the integrity of a fax transmission while it is in progress. ECM transmissions are possible only between machines that both have the ECM feature. If they do, you may send and receive fax messages that are continuously checked for their integrity. Sufficient memory must be available in your MFC for this feature to work. 1-6 INTRODUCTION