2
4. Set the
LEVEL
switch to position
3.
This setting should be
acceptable for most telephones. (See Figure 4)
5. If you are using an older type 2500 telephone that has a
carbon microphone, set the
LEVEL
switch to position
4
.
6. Set the
VOICE/MODEM
switch to
VOICE
position.
Do not use speakerphone mode if your telephone has this
feature.
1. Pick up the telephone handset and listen for dial tone.
2. The telephone handset must be left off hook for the length of
the data/fax transmission. Hanging up the handset will
terminate your call.
3. As soon as dial tone is heard, set the
VOICE/MODEM
switch
to
MODEM
position. This will disable the telephone handset.
4. Use your computer to initiate the modem dialing string. Ex-
cessive delay in completing steps 3 and 4 may result in loss
of dial tone.
5. If there is difficulty with the making or maintaining the modem
connection, set the
LEVEL
to position
2
and repeat steps 1
through 4 listed above.
6. If there is still difficulty, try setting the
LEVEL
to position
1
and repeat steps 1 through 4 listed above.
∗
The MPA-100A does not permit the reception of incoming
data or fax calls.
You can connect your computer’s modem to any telephone
having a modular handset jack.
1. Plug your data/fax modem telephone line cord into the MPA-
100A
MODEM
jack. (See Figure 3)
2. Remove the handset cord from the telephone handset jack
and plug into the MPA-100A
HANDSET
jack.
3. Plug the MPA-100A coiled cord into the telephone handset
jack.
Figure 3
Computer Modem Set-Up
Connecting to the Telephone
Modem Operation
Unpack the unit and check to make sure you have all the items
that come with your MPA-100A.
1. MPA-100A unit.
2. Mono-audio cord with a
1
/
8
inch plug at each end.
3. 120VAC to 18VDC power adapter.
During modem operation, the MPA-100A requires using either
the supplied 18VDC power adapter or two 9 volt batteries. The
power adapter can be used with or without the batteries in-
stalled.
1. If you are installing batteries, remove the battery compart-
ment cover located on the bottom of the unit. (See Figure 2)
2. Press against the latch and lift the cover upwards.
3. Follow the battery installation instructions located inside the
battery compartment.
4. Install two 1604A or equivalent 9 volt alkaline type batteries.
Use fresh batteries to assure optimum battery life.
5. Observe correct battery polarity when installing the batteries.
6. Press the
BATTERY TEST
button. The
BATTERY TEST
in-
dicator will light confirming the batteries are installed
correctly. (See Figure 1)
7. If the
BATTERY TEST
indicator does not light, either the
batteries are installed incorrectly, or at least one battery is
discharged.
Battery Installation
8. The MPA-100A draws power from the batteries only when
you are actually using the modem on line. Depending on the
modem, battery life should exceed 30 hours.
9. Re-install the battery cover.
Figure 1
Figure 2
BATTERY TEST
L E VE L
1 8 VD C R E C
1 2 3 4
Battery Test
button and
Indicator
+
9 V
O
L
T
+
9 V
O
L
T
Battery Cover Tab
Getting Started
VOICE
MODEM
HAND S E T
M O D E M
TT SYSTEMS
TT SYSTEMS
TT SYSTEMS
TT SYSTEMS
Voice/Modem switch
Computer
Not included)
Your Telephone
Modem
Jack
Handset
Jack
Handset
Plug
MPA-100A
Sold by:
http://www.TWAcomm.com
Toll Free: (877) 892-2666
