Xon/Xoff
Modems
Some
early
modems
assume
software
flow
control
(Xon/Xoff)
between
the
computer
and
the
modem.
Modems
with
this
design
send
extra
characters
during
and
after
the
transmitted
data.
The
service
processor
cannot
accept
these
extra
characters.
If
your
configuration
includes
such
a
modem,
your
functional
results
may
be
unpredictable.
The
sample
modem
configuration
files
included
in
this
appendix
do
not
support
these
modems,
so
custom
configuration
files
are
necessary.
Anchor
Automation
2400E
is
an
example
of
such
a
modem.
If
you
experience
unexplainable
performance
problems
that
may
be
due
to
Xon/Xoff
characters,
it
is
recommended
that
you
upgrade
your
modem.
Ring
Detection
Most
modems
produce
an
interrupt
request
each
time
they
detect
a
ring
signal.
Some
modems
generate
an
interrupt
only
on
the
first
ring
signal
that
they
receive.
AT&T
DataPort
2001
is
an
example
of
such
a
modem.
The
service
processor
uses
the
ring
interrupt
request
to
count
the
number
of
rings
when
Ring
Indicate
Power-On
(RIPO)
is
enabled.
If
your
modem
produces
an
interrupt
on
only
the
first
ring,
set
Ring
Indicate
Power-On
to
start
on
the
first
ring.
Otherwise,
you
can
choose
to
start
Ring
Indicate
Power-On
on
any
ring
count.
Terminal
Emulators
The
service
processor
is
compatible
with
simple
ASCII
terminals,
and
therefore
compatible
with
most
emulators.
When
a
remote
session
is
handed
off
from
the
service
processor
to
the
operating
system,
agreement
between
terminal
emulators
becomes
important.
The
server’s
operating
system
will
have
some
built-in
terminal
emulators.
You
may
also
have
a
commercially
available
terminal
emulation.
It
is
important
that
the
local
and
host
computers
select
the
same
or
compatible
terminal
emulators
so
that
the
key
assignments
and
responses
match,
ensuring
successful
communications
and
control.
For
best
formatting,
choose
line
wrap
in
your
terminal
emulator
setup.
Recovery
Procedures
Situations
such
as
line
noises
and
power
surges
can
sometimes
cause
your
modem
to
enter
an
undefined
state.
When
it
is
being
used
for
dial-in,
dial-out
or
ring
indicate
power-on,
your
modem
is
initialized
each
time
one
of
these
actions
is
expected.
If
one
of
these
environmental
conditions
occur
after
your
modem
has
been
initialized,
it
might
be
necessary
to
recover
your
modem
to
a
known
state.
If
your
modem
communicates
correctly
with
remote
users,
it
is
probably
in
control.
It
may
be
wise
to
occasionally
change
some
of
the
functional
settings
and
then
change
them
back,
just
for
the
sense
of
security
that
the
modem
is
communicating,
and
to
ensure
it
has
been
initialized
recently.
If
your
system
is
particularly
difficult
to
access
physically,
another
strategy
is
to
protect
it
with
an
Uninterruptible
Power
Source
(UPS)
and
a
phone-line
surge
protector.
In
case
recovery
becomes
necessary,
shut
down
your
system
using
established
procedures.
Disconnect
the
power
cable
and
press
the
power
button
to
drain
capacitance
while
power
is
disconnected.
Disconnect
and
reconnect
modem
power,
and
then
reconnect
system
power
to
completely
reinitialize
your
system.
Appendix
D.
Modem
Configurations
1083
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