Ericsson LBI-39055 manual Interconnecting Equipment, Audio Matrix Board

LBI-39055

amplifiers' source audio from the Audio Matrix Board (normal) to Line A and Line B balanced inputs (test), respectively. See LBI-39064 for specific details. With this test setting, audio signals on the line inputs are applied directly to the speakers' power amplifiers without being routed through the Audio Matrix Board.

NOTE

SW2 is not present on Audio PA Board

As shown in Figure 6, Audio Matrix Boards ship from the factory with all mic audio ALC circuits enabled. This is accomplished by setting all four SW1 switch positions to "ON" or "CLOSED". Table 4 lists each switch position and its corresponding mic input. Normally, mic audio ALC should not be disabled. Disable a mic's ALC by setting the corresponding DIP switch position to "OFF" or "OPEN".

TABLE 4 − AUDIO MATRIX BOARD

MIC AUDIO ALC ENABLE/DISABLE

P29/5000055000. Audio source selection on this

earlier board (sometimes referred to as a "Phase 1"

board) is accomplished via two jumpers/plugs

identified as JP1 and JP2. During normal (non-

test) console operations, jumpers must be in

between pins "A" and "C" on both plugs. These

settings route Line A and Line B audio signals

from the Audio PA Board to the Speaker A and

Speaker B power amplifiers. See LBI-38716 for

additional details.

TABLE 3 − AUDIO PA BOARD

AUDIO SOURCE SELECTION

SW1 POSITION

1

2

3

4

MIC

Boom/Gooseneck

Desk

Operator Headset

Supervisor Headset

SW2 POSITION				2
1	2	3	4		SOURCE	OUTPUT
ON	OFF	x	x		Matrix Bd.	Speaker A
OFF	ON	x	x		Line A In	Speaker A
x	x	ON	OFF		Matrix Bd.	Speaker B
x	x	OFF ONON1			Line3B In4	Speaker B

"x" = either position

Figure 5 − Audio PA Board SW2 Factory Setting

Audio Matrix Board

SW1 − Mic Audio ALC Enable/Disable DIP Switch

DIP switch SW1 on the Audio Matrix Board is used to independently enable or disable each microphone's automatic level control (ALC) circuit. The switch has four

(4)positions, one for each mic that may be connected to the board.

Figure 6 − Audio Matrix Board SW1 Factory Setting

I/O Board

No I/O Board configuration is necessary. Simply verify the Board is fully inserted into the far left-hand slot (as viewed from front).

INTERCONNECTING THE

EQUIPMENT

A C3 Maestro dispatch console system requires the following interconnections:

∙PC-to-CEC/IMC Data Concentrator Card (via punch blocks, if employed)

∙Audio Tower-to-CEC/IMC Audio Concentrator Card (via punch blocks, if employed)

∙PC-to-Audio Tower

∙PC-to-Dispatcher Keyboard

∙PC-to-Standard Keyboard (when in use)

∙PC-to-Video Display Monitor

∙Audio Tower-to-Desk Mic (if used)

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