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1 - 8 INTRODUCTION
Fax tones and handshake
When someone is sending a fax, the fax machine sends fax calling
tones (CNG tones). These are quiet, intermittent beeps every
4-seconds. You’ll hear them after you dial and press
Fax Start
and
they will continue for about 60 seconds after dialing. 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’ll soon learn to listen for
these quiet beeps each time you answer a phone 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
RECEIVE
.
If the fax machine is set to the
FAX ONLY
mode, it will answer every
call automatically with fax receiving tones. If the other person hangs
up, the fax machine will continue to send the “chirps” for about 40
seconds, and the LCD continues to show
RECEIVE
. To cancel the
receiving, press
Stop/Exit
.
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 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.
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.
Pay special attention to the directions for connecting a TAD in
this chapter. (See
Connecting an external telephone answering
device (TAD)
on page 1-11.)