Appendix D – Installing a Modem
under Linux
This
appendix
explains
how
to
install
a
modem
on
a
computer
operating
under
the
Red
Hat
Linux
6.2
operating
system.
Other
versions
of
Red
Hat
and
other
Linux
operating
systems
should
be
similar.
Briefly,
in
Linux,
you
do
not
need
drivers
for
most
standard
external
modems
and
most
internal
ISA
bus
modems.
Programs
in
Linux
commonly
call
upon
the
port,
rather
than
the
modem.
Standard
Linux
Serial
Port
Definitions
PC
port
Linux
port
Com1
ttyS0
Com2
ttyS1
Com3
ttyS2
Com4
ttyS3
Installation
Connect
the
external
modem
to
an
available
serial
port.
Setup
This
section
describes
how
to
make
sure
Linux
can
talk
to
the
modem
and
be
able
to
dial
up
the
Internet.
Linux
can
use
different
programs
and
desktops
depending
on
who
made
the
Linux
operating
system
and
what
version
it
is.
The
following
procedures
use
the
most
commonly
installed
components
of
Red
Hat
6.2.
More
information
can
be
found
in
your
Linux
OS
owner’s
manual.
Using
the
Terminal
Program
Minicom
to
Verify
Operation
1.
At
the
command
prompt,
type
minicom
–s
and
press
E
NTER
.
2.
Select
Serial
port
setup
and
press
E
NTER
.
3.
From
Serial
port
setup
,
use
the
A
key
to
access
Serial
Device
,
and
then
press
E
NTER
.
4.
Press
E
SC
.
5.
You
are
now
in
the
Minicom
terminal.
Type
AT
and
press
E
NTER
.
The
screen
should
display
OK
to
verify
the
operation.
Alternately,
dial
a
phone
number
to
verify
line
operation
6.
To
leave
Minicom,
press
C
TRL
+
A,
and
then
press
Z.
7.
On
the
help
menu,
press
X
to
exit.
Using
the
Modem
to
Call
the
Internet
Linux
allows
different
graphic
user
interfaces
(GUI).
In
the
following
steps,
we’ll
use
the
Gnome
Desktop
GUI
and
assume
that
your
Internet
Service
Provider
(ISP)
assigns
the
Domain
Name
Service
(DNS)
and
Internet
Protocol
(IP)
addresses.
1.
On
the
Task
Bar
at
the
bottom
of
the
screen,
select
the
Gnome
Footprint.
2.
Select
Internet
from
the
menu.
40
Multi
‐
Tech
Systems,
Inc.
MT9234ZBA
‐
Series
User
Guide
