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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