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Setup & preparation before usi, What is the fax “handshake, Is this a fax call – Brother 875 MC User Manual

Page 13

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SETUP & PREPARATION BEFORE USI

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What is the Fax “Handshake^*?

The

calling

machine

sends

CNG

tones

(beeps)

and

the

receiving

machine

sends

receiving

tones

(chirps). During the handshake these tones must overlap for 2-4 seconds so the fax machines can

set up protocol. The sending machine states how it is sending the message; the receiving machine

answers

whether

it

is

capable

of

receiving

that

way.

The

sending

machine’s

CNG

tones

continue

for

only

30

seconds

after

the

number

is

dialed.

Calls

must

be

answered

within

4

rings

(20-22

seconds) or less, because the handshake can not begin until the call is answered. With 4 rings,

only

8-10

seconds

are

left

for

the

fax

machines

to

hear

their

tones

clearly

and

communicate.

Timing is crucial.

When

you

have

a

telephone

answering

device

(TAD)

on

your

fax

line,

you

can

set

the

TAD

to

answer in 4 rings as long as you record a 5 second silence as the beginning of your OGM (outgoing

message).

(See

page

7-11

for

more

information.)

This

will

prevent

the

OGM

from

covering

up

the

fax tones during the 8 seconds that are left for the handshake. As soon as your TAD answers a

call, your fax machine will listen for fax tones for 30 seconds. So you must limit your speaking to

20

seconds

(25

second

total

OGM).

Since

many

people

dial

manually

without

realizing

they

are

not sending fax tones, you should give your Remote Activation Code (*51) as the last part of your

20 second Message. For example: '‘After the beep, either leave a message or send a fax by pressing

*51.” (See page 7-11 for more information.)

What Causes the Transmission Verification Report to Print ^^Result:

During the handshake, the document(s) you are sending begin to roll through the feeder and stop

until the handshake is completed and the machines are ready to send and receive the data. If there

is noise or static on the phone line or if the machines do not agree on protocol, they drop their baud

rate to the next lower level and try again. The initial baud rate is 14400, then 12000, 9600, 7200,

4800 and finally 2400. Transmissions as low as 2400 baud can be successful. So, do not stop your

machine.

If

the

transmission

fails,

a

Transmission

Verification

Report

will

be

printed

automatically

with

“Result;

NG”.

This

usually

means

the

transmission

was

“No

Good”

because

of

temporary

noise or static on the phone line. Try to send the fax again. Also, you may try sending a fax to other

locations to see if the problem is on the phone line at your end.

Is This a Fax Call?

There are three signs that the call you answered is a fax. You will hear either soft intermittent

beeps

(Automatic

transmission),

silence

(Manual

transmission)

or

the

voice

of

someone

telling

you he/she is trying to send you a fax (Manual transmission). Do not hang up the handset. It
is very frustrating for the person who hears you repeatedly answer and hang up. People who dial

manually

are

waiting

to

hear

fax

tones

before

pressing

START.

You

must

activate

your

fax

machine to take over the call before you disconnect the line by replacing the handset.

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