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LBI-39055
contact normally-open type. The ground connections are
common.
(TOP)
B/G PTT
INPUT
B/G PTT
GROUND
MONITOR PTT
INPUT
MONITOR PTT
GROUND
Figure 9 − − I/O Board Boom/Gooseneck PTT and
Monitor Terminal Block Pin-Out
Footswitches (if used)
Two (2) female DB-9 connectors are located on the I/O
Board for footswitch interconnections. "FOOTSWITCH 1"
keys the desk mic and "FOOTSWITCH 2" keys the headset
and boom/gooseneck mics. Footswitches used with the C3
Maestro dispatch console include single-footswitch option
CRSU3B and dual-footswitch option CRSU3C. On the dual-
footswitch, one switch keys the mic and the other switch is a
monitor switch. Each input is wired in parallel at the
following points and thus may be activated from any one of
several locations. See the schematic in the appropriate
board's maintenance manual for specific connector pin-out
details.
•
B/G PTT input is located at the "B/G PTT" &
"MON PTT" terminal block on the I/O Board, at
the "FOOTSWITCH 2" female DB-9 connector
on the I/O Board, and at the "BOOM/GOOSE
MIC" female DB-9 connector on the Audio Matrix
Board.
•
Monitor switch input is located at the "B/G PTT"
& "MON PTT" terminal block on the I/O Board, at
the "FOOTSWITCH 1" female DB-9 connector
on the I/O Board, at the "FOOTSWITCH 2"
female DB-9 connector on the I/O Board, and at
the "DESK MIC" female DB-9 connector on the
Audio Matrix Board.
•
Desk mic PTT is located at the "FOOTSWITCH
1" female DB-9 connector on the I/O Board and at
the "DESK MIC" female DB-9 connector on the
Audio Matrix Board.
All footswitch cables terminate with male DB-9
connectors. Mate the appropriate male DB-9 footswitch
connector to the respective female DB-9 connector on the
I/O Board.
14
B/G PTT
MON PTT
Volume Controller Box (if used)
If the console system is equipped with speakers, the
Volume Controller Box must be used. Typically, it is
located under the video display monitor but it may be placed
at any convenient location within cable reach of the Audio
Tower. The supplied cable is ten (10) feet in length.
The cable used with the Volume Controller Box has
male DB-15 connectors on both ends. Its part number is
P29/1030049000. Mate one end of this cable to the DB-15
connector at the back of the Volume Controller Box. Mate
the other end to the female DB-15 connector labeled
"VOLUME CONTROLLER" at the bottom of the Audio
Tower's rear panel. This connector is located on the
Spreader Board.
Each Audio PA Board installed in the Audio Tower that
has speakers connected to it must have a "jumper" cable
connected between its "VOLUME CONTROLLER" DB-9
connector and the Spreader Board. The "jumper" cable's
part number is P29/1030048000. If the second Audio PA
Board (#2) is used only for Call Director interfacing, it will
not have any speaker connections and it will therefore not
require a "jumper" cable.
Only one "jumper" cable is required for a 2-speaker
console. A 3- or 4-speaker console which is equipped with
two Audio PA Boards requires two "jumper" cables.
Connect a "jumper" cable between the first Audio PA
Board's connector labeled "VOLUME CONTROLLER"
and the connector labeled "A" on the Spreader Board. The
first Audio PA Board (#1) is located in the slot adjacent to
the Audio Matrix Board. If the console system has 3- or 4-
speakers, connect a second "jumper" cable between the
second Audio PA Board's connector labeled "VOLUME
CONTROLLER" and the connector labeled "B" on the
Spreader Board. The second Audio PA Board (#2) is
located in the Audio Tower's far right-hand slot as viewed
from the back of the Audio Tower.
Speakers (if used)
Mount the speakers in a suitable location. Connect the
leads from each speaker to the terminal block's screw
terminals on the Audio PA Board as specified in Table 8.
These terminals are not polarity sensitive. Load resistors are
not required for unused speaker outputs.
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