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US Robotics COURIER - Modem Connection Failures

US Robotics COURIER
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COURIER HIGH SPEED MODEMS
Both
modems
...
Exchange carrier signals, but fail
to
establish a communications link
1.
If
you
have
a fax
modem,
make
sure
it is
in
the
correct
mode,
fax
or
data,
depending
on
whether
the
connection
is to
be
made
with
a facsimile device
or
a
data
modem.
See Fax
Operations
in
Appendix
E for
information
on
switching
between
fax
and
data
modes.
2.
Asynchronous
operations:
Check
to
make
sure
the
proper
bit
rate,
word
length,
parity
and
number
of
Stop
bits
have
been
selected.
Synchronous
operations:
review
the
link
instructions
in
Chapter
7.
If
you've
set
the
modem
to
the
correct configuration,
the
problem
may
be
with
the
synchronous
adapter
or
with
the
system
you're
trying
to call.
3.
Check
to see
that
your
modem
is
at
the
correct Bn
setting
to
connect
with
either
an
HST
modem
(Bl setting)
or
V.32
modem
(BO
setting).
Type
ATI4 for a
display
of
the
Courier's
current
settings
and,
if necessary,
send
the
modem
the
correct setting.
4.
If
your
modem
is
attempting
to
answer
a V.32 call,
you
may
need
to
lengthen
the
extra V.32
answer
tones. See S28
in
Appendix
5.
5.
Depending
on
your
model,
make
sure
the
modem
at
the
other
end
of
the
line is HST compatible, V.32
bis
compatible
at
14.4K
bps,
or
V.32
compatible
at
9600
bps,
V.22
bis-
compatible
at
2400
bps,
Bell 212A-compatible
at
1200
bps,
or
Bell 103-compatible
at
300
bps.
These
are
the
common
signaling
standards
for full
duplex
dial-up
network
transmission
in
the
U.S.
6.
Make
sure
your
modem's
link
rate
setting,
&Nn
is correct for
the
call.
If
the
link
rate
is locked
at
a
speed
(&Nl-&N9)
different
from
the
calling
modem's,
the
Courier
hangs
up.
The factory
setting
of
&NO,
variable
link
operations,
allows
the
two
modems
to
negotiate
the
highest
possible
link
rate.
7.
If
none
of
the
above
corrects
the
problem,
it's likely
that
the
quality
of
the
phone
connection
is
poor
and
that
the
other
modem
is
missing
the
signals
your
modem
is
transmitting.
The
variable
quality
of
phone
line connections
may
be
due
to
any
number
of
conditions
in
the
phone
service's
equipment
Problems and Solutions D-3

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