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About Fax Machines
If you are a first-time fax machine user, fax operation might seem a little mysterious. You will soon
get used to the unusual fax tones on your phone line, and be able to send and receive faxes easily.
Fax Tones and Handshake
When someone is sending a fax, the MFC sends fax calling tones, (CNG tones)—soft, intermittent
beeps at 4 -second intervals. You will hear them when you dial and press Start , and they continue
for about 40 seconds after dialling. During that time, the sending machine must begin the
"handshake" with the receiving machine. Each time you use automatic procedures to send a fax, you
are sending CNG tones over the phone line. You will soon learn to listen for these soft beeps each
time you answer a phone on your MFC line, so you can know if you are about to receive a fax
message.
The receiving fax responds with fax receiving tones—loud, chirping sounds. A receiving fax chirps
for about 40 seconds over the phone line, and the screen displays RECEIVE. 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 40 seconds, and the screen continues
to display RECEIVE. To cancel the receiving mode, press Stop.
When your MFC is in Fax/Tel mode, it answers with a short beep. After this beep, the fax machine
listens for CNG tones, and then responds with receiving tones if the CNG tones are present. If it is
a voice incoming call, the MFC makes an attention sound.
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. We suggest 2
rings as the standard setting.
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.
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Chapter 23
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