Instruction manual

ACU-1000 Operations Manual
6-3
c.) Pull the module from the ACU-1000 chassis and slide the “charge” switch into
the “ON” position. Additionally, place the “DC-INPUT” switch into the “12 VDC”
position.
d.) Reinstall the PSM-1A module, tighten the retaining screws and plug the ACU-
1000 power cable into the wall.
e.) Located on the rear panel of the ACU-1000 are DB-15 receptacles, which
correspond to the modules mounted in the front of the chassis. Receptacle P1 on the
ACU-1000 is used for extension 1, which is the first module after the CPM-4 card. The
same principle is true for the remaining 11 extensions. Plug in the other end of the
cable coming from the STU-III box into the extension (P1-P12) the user wants to use
with the STU-III phone. If the other end of the cable is plugged into P1 on the ACU-
1000, then the STU-III phone will work with the DSP-2 module in extension 01.
6.1.3.2 ACU-1000 Alignment for STU-3
1) Make a call from the local STU-III telephone; establish a voice link with the party on
the distant STU-III phone. Place the STU-III phones into the secure mode and pause
for the phone to report it is in the secure mode. For this example, it will be assumed the
STU-III phone is connected to P1, which means it will work with the DSP-2 in
extension 01. Connect the supplied handset into the HSP-2A module. Connect the
HSP-2A module to the DSP-2 connected to the STU-III phone, in this example it would
be extension 01. This connection can be made via the ACU Controller software
program or via the HSP-2A keypad. When the HSP-2A is connected to the DSP-2
associated with the STU-III phone, the STU-III handset will no longer work, and the
ACU-1000 will now be the handset. The user can now talk to the party on the distant
phone via the handset plugged into the HSP-2A module. The user must push the PTT
button on the handset to send audio to the distant user.
Note: If no audio is heard from the distant listener it may be necessary
to open the STU-III interface box and move the polarity switch to the
reverse position. Some manufacturers such as Motorola use a different
MIC polarity contrasting ATT and others. Remove the two screws on the
top of the box to remove the cover. When the boxes are mounted three
wide, it may be necessary to remove all three boxes to open the boxes.
Newer versions of the boxes have a slot cut through the box to access
the switch.
2) The user may now set up the DSP-2 levels to match the STU-III phone. The TX and
RX levels of the DSP-2 modules may be adjusted via either the ACU Controller
software program or the HSP-2A module.
a) The user should talk to the party at the distant phone and find out how the levels
are at the distant end. If the levels need to be adjusted, the user should adjust the DSP-2
TX level. If the user finds the levels coming from the distant phone are too loud or soft
the user may adjust the RX level in the DSP-2 module. Once the levels are set for each
phone, they should not need to be adjusted again unless the phone changes.