Chapter
6
–
Troubleshooting
Multi
‐
Tech
Systems,
Inc.
MT9234ZBA
‐
Series
User
Guide
27
●
Is
your
line
noisy?
If
there
is
static
on
your
line,
the
modem
has
to
resend
many
blocks
of
data
to
insure
accuracy.
You
must
have
a
clean
line
for
maximum
speed.
●
Are
you
downloading
a
compressed
file
with
MNP
5
hardware
compression
enabled?
Since
hardware
data
compression
cannot
compress
a
file
already
compressed
by
an
archiving
program,
the
transfer
can
be
marginally
slower
with
data
compression
enabled
than
with
it
disabled.
●
Does
your
Internet
service
provider
(ISP)
use
the
same
56K
protocol
as
your
modem?
The
default
setting
of
your
modem
is
to
connect
using
either
the
V.92
or
the
V.90
protocol,
depending
on
which
one
the
ISP’s
modem
is
using.
If
your
ISP
uses
the
V.90
protocol,
the
maximum
speed
you
will
be
able
to
upload
at
is
33,600
bps.
Check
with
your
ISP
to
see
which
protocols
it
supports.
●
Are
you
trying
to
send
a
file
to
another
client
modem?
If
so,
then
your
maximum
possible
connect
speed
is
33,600
bps.
You
can
upload
at
speeds
up
to
48,000
bps
only
when
connected
to
an
ISP
that
supports
the
V.92
protocol.
●
Try
entering
the
I11
command
in
online
mode
or
the
&V
command
in
command
mode
to
display
information
about
the
last
connection,
making
a
screen
of
the
connection
statistics,
and
checking
for
parameters
that
might
be
unacceptable.
Data
Is
Being
Lost
●
If
you
are
using
data
compression
and
a
high
speed
serial
port,
set
the
serial
port
baud
rate
to
two
to
six
times
the
data
rate.
●
Make
sure
the
flow
control
method
you
selected
in
software
matches
the
method
selected
in
the
modem.
●
Try
entering
the
I11
command
in
online
mode
or
the
&V
command
in
command
mode
to
display
information
about
the
last
connection,
making
a
screen
of
the
connection
statistics,
and
checking
for
parameters
that
might
be
unacceptable.
There
Are
Garbage
Characters
on
the
Monitor
●
Your
computer
and
the
remote
computer
might
be
set
to
different
word
lengths,
stop
bits,
or
parities.
If
you
have
connected
at
8
‐
N
‐
1,
try
changing
to
7
‐
E
‐
1,
or
vice
‐
versa,
using
your
communication
software.
●
You
might
be
experiencing
line
noise.
Enable
error
correction,
if
it
is
disabled,
or
hang
up
and
call
again;
you
might
get
a
better
connection
the
second
time.
●
At
speeds
above
2400
bps,
the
remote
modem
might
not
use
the
same
transmission
or
error
correction
standards
as
your
modem.
Try
connecting
at
a
slower
speed
or
disabling
error
correction.
(With
no
error
correction,
however,
line
noise
can
cause
garbage
characters.)
●
Try
entering
the
I11
command
in
online
mode
or
the
&V
command
in
command
mode
to
display
information
about
the
last
connection,
making
a
screen
of
the
connection
statistics,
and
checking
for
parameters
that
might
be
unacceptable.
The
Modem
Doesn’t
Work
with
Caller
ID
●
Caller
ID
information
is
transmitted
between
the
first
and
second
rings,
so
if
autoanswer
is
turned
off
(
S0=0
)
or
if
the
modem
is
set
to
answer
after
only
one
ring
(
S0=1
),
the
modem
will
not
receive
Caller
ID
information.
Check
your
initialization
string,
and
if
necessary
change
it
to
set
the
modem
to
answer
after
the
second
ring
(
S0=2
).
●
Make
sure
that
you
have
Caller
ID
service
from
your
telephone
company.
Fax
and
Data
Software
Can’t
Run
at
the
Same
Time
●
Communication
devices
can
be
accessed
by
only
one
application
at
a
time.
In
Windows
2000
and
higher,
you
can
have
data
and
fax
communication
applications
open
at
the
same
time,
but
they
cannot
use
the
same
modem
at
the
same
time.
