Fax Tones and Handshake
When someone is sending a fax, the FAX/MFC sends fax calling tones (CNG tones)— soft, intermittent beeps at
The receiving fax responds with fax receiving
When your FAX/MFC answers in FAX/TEL Mode, the FAX/MFC listens for CNG tones and then responds with receiving tones.
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 machines can understand how each is sending and receiving the fax. The handshake cannot begin until the call is answered, and the CNG tones only last for about 40 seconds after the number is dialed. Therefore, it’s important for the receiving machine 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 in the Installation chapter for connecting a TAD to your FAX/MFC.
ECM (Error Correction Mode)
The Error Correction Mode (ECM) is a way for the FAX/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 FAX/MFC for this feature to work.
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