INTRODUCTION 1 - 7
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 60
seconds after the number is dialed. So it is important for the receiving
machine to answer the call in as few rings as possible.
ECM (Error Correction Mode)
The Error Correction Mode (ECM) is a way for the machine to check
a fax transmission while it is in progress. ECM transmissions are only
possible between machines that both have this feature. If they do,
you may send and receive fax messages that are continuously being
checked by the machine.
Your machine must have enough memory for this feature to work.
When you have an external Telephone Answering Device (TAD)
on your fax line, your TAD will decide the number of rings before
the call is answered. (See Connecting an External Telephone
Answering Device (TAD) on page 1-9.)
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