INTRODUCTION 1 - 7
About fax machines

Fax tones and handshake

When someone is sending a fax, the machine sends fax calling tones
(CNG tones). These are quiet, intermittent beeps every 4-seconds.
You’ll hear them after you dial and press Mono Start or
Colour Start and they will continue for about 60 seconds after
dialling During th at time, the sending machine must begin the
“handshake”, or conn ection, with the receiving machi ne.
Each time you use automatic procedures to send a fax, you are
sending CNG tones over the phone line. You’ll soon learn to listen for
these quiet beeps e ach time you answer a phon e on your fax line, so
you will know if you are receiving a fax message.
The receiving fax responds with fax receiving tones, which are loud,
chirping sounds. A receiving fax chirps for about 40 seconds over the
phone line, and the LCD shows Receiving.
If your machine is set to the Fax Only mode, it will answer every call
automatically with f ax receiving tones. If the ot her person hangs up,
your machine will contin ue to send the “chirps” for abo ut 40 seconds,
and the LCD conti nues to show Receiving. To cancel receiving,
press Stop/Exit.
The fax ‘handshake’ is the time in which the sending machine’s CNG
tones and the receiving machine’s “chirps” overlap. This must be for
at least 2 to 4 second s, so both machines can un derstand how each
is sending and receivi ng the fax. The handshake cannot b egin until
the call is answered, and the CNG tones only last for about 60
seconds after the num ber is dialled. So it is important f or the
receiving machine to answer the call in as few rings as possible.
When you have an extern al Telephone Answering Dev ice (TAD)
on your fax line, your TAD will decide the number of rings before
the call is answered.
Pay special attent ion to the directions for connect ing a TAD in
this chapter. (See Connecting an external telephone answering
device (TAD) on page 1-10.)