Brother International IntelliFax-2820 Users Manual - English - Page 31

Fax tones and handshake, ECM (Error Correction Mode), Start, Stop/Exit

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Chapter 1 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 Start and they will continue for about 60 seconds after dialing. During that time, the sending machine must begin the "handshake" or connection 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 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 Receiving. If your machine is set to the Fax Only mode, it will answer every call automatically with fax receiving tones. If the other person hangs up, your machine will continue to send the "chirps" for about 40 seconds, and the LCD continues 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 seconds, so both 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. If the machine detects errors during fax transmission, it resends the pages of the fax that had an error. ECM transmissions are only possible between fax machines that both have this feature. If they do, you may send and receive fax messages that are continuously being checked by the machine. If this feature stops working, delete your faxes from the memory. 1 - 13

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Chapter 1
1 - 13
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
Start
and they will continue for
about 60 seconds after dialing. During that
time, the sending machine must begin the
“handshake” or connection 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 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
Receiving
.
If your machine is set to the Fax Only mode,
it will answer every call automatically with fax
receiving tones. If the other person hangs up,
your machine will continue to send the
“chirps” for about 40 seconds, and the LCD
continues 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 seconds, so both
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. If the machine detects
errors during fax transmission, it resends the
pages of the fax that had an error. ECM
transmissions are only possible between fax
machines that both have this feature. If they
do, you may send and receive fax messages
that are continuously being checked by the
machine.
If this feature stops working, delete your
faxes from the memory.