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Chapter
4.
Installing
modems
Note:
Throughout
this
chapter,
the
term
switch
refers
to
the
M12.
Each
CP
card
in
the
switch
contains
a
modem
serial
port
that
allows
you
to
connect
to
a
Hayes-compatible
modem.
The
modem
serial
port
is
wired
as
a
standard
DTE
port.
You
do
not
need
any
additional
software
on
the
switch
to
use
the
modems.
The
modem
serial
port
has
the
same
command,
login
capabilities,
and
operational
behavior
as
the
terminal
serial
port.
However,
asynchronous
informational
messages
and
other
unsolicited
text
are
not
sent
to
the
modem
ports.
Connecting
a
separate
modem
to
each
CP
card
and
then
connecting
both
modems
to
a
shared
telephone
line
ensures
the
high
availability
of
the
modem
connection.
This
ensures
that
one
telephone
line
is
used
to
access
the
active
CP
card
when
a
failover
occurs.
You
must
log
in
again
if
a
failover
occurs.
If
both
CP
cards
connect
to
a
shared
telephone
line,
callers
automatically
dial
into
the
active
CP
card.
The
active
CP
card
answers
on
the
first
ring.
If
the
active
CP
card
cannot
answer
for
any
reason,
the
standby
CP
card
answers
on
the
seventh
ring
and
allows
a
login
to
proceed.
Note:
The
switch
detects
modems
only
during
power
on,
restart,
or
a
CP
card
failover
sequence.
After
you
connect
the
modems,
you
can
use
a
Telco
system
to
dial
in
to
the
modems
and
verify
that
they
answer
and
dialogue
as
expected.
If
a
dial-out
modem
facility
is
not
available,
you
can
use
a
terminal
emulation
program
on
a
computer
workstation
(or
laptop)
that
has
an
attached
modem.
See
for
instructions
on
how
to
set
up
a
remote
modem
for
testing
purposes.
For
security
reasons,
the
modem
session
is
automatically
disconnected
if
the
modem
cable
is
detached
while
a
session
is
active.
shows
two
modems
that
are
connected
to
a
switch.
©
Copyright
IBM
Corp.
2004
33
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