Brother FAX 1570MC ч.1 [10/58] 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/MFC 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 about 40 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 about 40 seconds over the phone line, and the screen

displays “RECEIVE.” If your FAX/MFC 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/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 FAX/MFC is in FAX/TEL (F/T), it answers with a short beep. After this

beep, the FAX/MFC 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 machines “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 about 40 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/MFC.