Chapter
6
–
Troubleshooting
●
If
the
modem
reports
BUSY,
the
other
number
might
be
busy,
in
which
case
you
should
try
again
later.
However,
it
might
indicate
that
you
have
failed
to
add
a
9,
the
prefix
to
the
phone
number
if
you
must
dial
9
for
an
outside
line.
If
you
must
dial
9
to
get
an
outside
line,
the
easiest
way
to
dial
it
automatically
is
to
include
it
in
the
modem’s
dial
prefix;
e.g.,
ATDT9
.
Note
the
comma,
which
inserts
a
pause
before
the
number
is
dialed.
By
inserting
9,
into
the
dial
prefix,
you
do
not
have
to
include
it
in
each
directory
entry.
To
change
the
dial
prefix
in
Windows
HyperTerminal,
select
Connect
from
the
Call
menu,
click
Dialing
Properties
,
and
type
9
in
the
local
and
long
distance
boxes
in
How
I
dial
from
this
location
.
●
If
the
modem
reports
NO
ANSWER
,
the
other
system
has
failed
to
go
off
‐
hook,
or
you
might
have
dialed
a
wrong
number.
Check
the
number.
●
If
the
modem
reports
NO
CARRIER
,
the
phone
was
answered
at
the
other
end,
but
no
connection
was
made.
You
might
have
dialed
a
wrong
number,
and
a
person
answered
instead
of
a
computer,
or
you
might
have
dialed
the
correct
number
but
the
other
computer
or
software
was
turned
off
or
faulty.
Check
the
number
and
try
again,
or
try
calling
another
system
to
make
sure
your
modem
is
working.
Also,
try
calling
the
number
on
your
telephone.
If
you
hear
harsh
sounds,
then
another
modem
is
answering
the
call,
and
the
modems
might
be
having
problems
negotiating
because
of
modem
incompatibilities
or
line
noise.
Try
connecting
at
a
lower
speed.
●
Poor
line
conditions
can
affect
the
connection.
When
using
V.34
or
V.32
client
‐
to
‐
client
connections
in
poor
conditions,
setting
S38=0
may
result
in
better
performance.
The
Modem
Disconnects
While
Online
●
If
you
are
not
using
Modem
on
Hold,
Call
Waiting
can
interrupt
your
connection
when
someone
tries
to
call
you.
If
you
have
Call
Waiting
service,
disable
it
before
each
call.
In
most
telephone
areas
in
North
America,
you
can
disable
Call
Waiting
by
preceding
the
telephone
number
with
*70
(but
first
check
with
your
local
telephone
company).
You
can
automatically
disable
Call
Waiting
by
including
the
disabling
code
in
the
modem’s
dial
prefix
(e.g.,
ATDT*70,
–
note
the
comma,
which
inserts
a
pause
before
the
number
is
dialed).
To
change
the
dial
prefix
in
Windows
98
HyperTerminal,
select
Connect
from
the
Call
menu,
click
Dialing
Properties
,
check
This
location
has
Call
Waiting
,
and
select
the
correct
code
for
your
phone
service.
If
you
have
extension
phones
on
the
same
line
as
your
modem,
you
or
someone
else
can
interrupt
the
connection
by
picking
up
another
phone.
If
this
is
a
frequent
problem,
disconnect
the
extension
phones
before
using
the
modem,
or
install
another
phone
line
especially
for
the
modem.
●
Check
for
loose
connections
between
the
modem
and
the
computer,
the
telephone
jack,
and
AC
power.
●
You
might
have
had
a
poor
connection
because
of
line
conditions
or
the
problem
might
have
originated
on
the
other
end
of
the
line.
Try
again.
●
Your
ISP
might
have
hung
up
on
you
because
of
lack
of
activity
on
your
part
or
because
you
exceeded
your
time
limit
for
the
day.
Try
again.
Modem
Cannot
Connect
When
Answering
●
The
default
DTR
Control
command
(
&D2
)
inhibits
autoanswer.
To
enable
autoanswer,
change
DTR
Control
to
&D0
,
and
make
sure
&Q0
,
&Q5
,
or
&Q6
is
also
set.
For
more
information,
see
the
&D
command
in
the
AT
Commands
Reference
Guide.
For
information
on
changing
the
modem’s
default
configuration,
refer
to
the
&D
command
in
the
AT
Commands
Reference
Guide.
●
Autoanswer
might
be
disabled.
Turn
on
autoanswer
in
your
communications
program
or
send
the
command
ATS0=1
(
ATS0=2
if
you
have
Caller
ID
service)
to
your
modem
in
terminal
mode.
File
Transfer
Is
Slower
Than
It
Should
Be
●
If
you
are
using
a
slow
transfer
protocol,
such
as
Xmodem,
try
Zmodem
or
Ymodem/G
instead.
26
Multi
‐
Tech
Systems,
Inc.
MT9234ZBA
‐
Series
User
Guide
