Radio Shack TRS-80 Modem II Operation Manuals page 30

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REMote
Test
If
both of
the
modems
pass the
LOCal
Test
and
data transmission
is still
inaccurate,
run
the
REMote
Test.
This
test
loops the
RS-232
data
from
the
modem
receiver
to the driver. In
doing
so,
it
checks
the
operation of
the
modems,
terminals,
and phone
connections. You'll need
the
cooperation of another person
who
is
using
a
modem.
1
Establish communication with
the other person.
2.
The
other person should
set
his/her
TEST
Switch
to
REM
(if
they are using
a
Modem
II).
3.
Set
your
TEST
Switch
to
OFF.
4.
Type some
letters
and/or
numbers on
your keyboard.
If
the characters are displayed
first
on
the other
Video
Display
and
then
on your
Display, both systems have passed
the
REMote
Test.
Repeat
the
test,
reversing
the
switches and having
the other
person
type,
just to
be
sure.
If the characters don't
appear on both
screens, both
you and
the other person should repeat
the
LOCal
test. If
the
LOCal
Test does not
detect
any problems,
but the
system
still
doesn't
pass the
REMote
Test,
you've probably
got
phone
line
problems.
If
the situation
persists,
contact
your phone company.
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