Brother FAX 1170 ч.1 [12/50] Fax tones and handshake

CHAPTER ONE

About Fax Machines

If you’re a first-time fax machine user, fax operation might seem a little

mysterious. You’ll soon get used to the unusual fax tones on your phone line, and

be able send and receive faxes easily.

Fax Tones and Handshake

When someone is sending a fax, the fax machine sends fax calling tones,

(CNG tones) — soft, intermittent beeps at 4-second intervals. You’ll hear them

when you dial and press

Start

, and they continue for 30 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

soft beeps each time you answer a phone on your fax line, so you can know if you

are receiving a fax message.

The receiving fax responds with fax receiving tones — loud, chirping sounds. A

receiving fax chirps for 40 seconds over the phone line, and the screen displays

“RECEIVE.” If your machine is set to the FAX ONLY Mode, it will answer every call

automatically with fax receiving tones. Even if the other party hangs up, your fax

machine continues to send the “chirps” for 40 seconds, and the screen continues

to display “RECEIVE.” To cancel the receiving mode, press

Stop

When your fax machine is in FAX/TEL (F/T), it answers with a short beep. After

this beep, the fax machine listens for CNG tones, and then responds with receiving

tones.

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 two to four

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 30 seconds after the number is dialed. Therefore, it’s 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 determine the number of rings before the call is answered. Pay

special attention to the directions in the Installation chapter for connecting a TAD

to your fax machine.