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3
INTRODUCTION
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 only last for about 40 seconds after the
number is dialled. Therefore, it is 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
MFC 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 (or answering machine) to your MFC.
ECM (Error Correction Mode)
The 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. Because of this you should send and receive
error free documents, thus avoiding the need to resend.
Sufficient memory must be available in your MFC for this feature to
work.