Radio Shack TRS-80 Modem II Operation Manuals page 11

2/Setting
Up
the
Modem
II
Set
your
Modem's
POWER
Switch
to
OFF
before connecting anything!
There
are three steps to setting
up your
modem.
Each
step
is
fully
explained
in this section.
•
Connect your
Modem
II
to
your
telephone.
•
Connect your
Modem
II to
a
power
supply.
®
Connect your
Modem
II to
a
computer.
Connecting
the
Telephone
to
the
Modem
II
The way
you connect
the
Modem
II to
a
telephone
depends on
how
your
telephone
is
connected
to
the wall.
The
following three figures
illustrate
these connections.
If
you're using
your
Modem
II
outside the
USA,
you
may
need
a
Modular-to-Modular Cable
(Radio
Shack Catalog
Number 279-374) and
a
Duplex Modular Jack
(279-357).
Figure
3.
Modular Connector
If
your telephone has
this
type of connection,
attach
your
Modem
II
as
shown.
(If
you
plan
on
using
the
Modem
in
AUTOmatic Modes
only,
you
don't
need
to
use
a telephone.)