Installation
ACC2500 Audio Control Center
09/08 24
Microphone Sensitivity Adjustments
After connections have been made, the ACC2500 must be configured for transmit and receive audio levels.
These adjustments are made using the front panel buttons. The microphone sensitivity adjustment is used
to compensate for different user voice levels and varied acoustical conditions. Refer to the following
instructions to adjust the different microphones.
Internal Microphone Sensitivity
1.
Place the handset in the cradle.
2.
While holding down
TIME
button, momentarily press
VOLUME
Up button (
∆
) to enable microphone
sensitivity adjustment. By default, this adjustment is disabled and must be enabled after each reset.
The display will indicate the current microphone level on the display for approximately 2 seconds.
3.
Press and hold
TRANSMIT
, speak into the internal microphone, and press
VOLUME
Up or
VOLUME
Down to increase sensitivity or decrease microphone sensitivity.
N
OTE
:
The display shows the
relative TX level as a number between 1 and 5. To confirm the absolute level, measure the transmit
level across the TX line pair using an ac millivolt meter or dBm meter.
4.
After the adjustment has been made, press and hold the
IC
button, and momentarily press the
VOLUME
Down button. A single beep is heard to indicate the microphone sensitivity adjustment function has
been disabled.
Handset Microphone Sensitivity
1.
With the handset off-hook, while holding down
TIME
button, momentarily press
VOLUME
Up button
(
∆
) to enable microphone sensitivity adjustment. By default, this adjustment is disabled and must be
enabled after each reset. The display will indicate the current microphone level on the display for
approximately 2 seconds.
2.
To adjust the sensitivity level, press the handset PTT button, speak into the handset microphone, and
press
VOLUME
Up or
VOLUME
Down to increase or decrease the sensitivity level.
3.
After the adjustment has been made, press and hold the
TIME
button, and momentarily press the
VOLUME
Down button. A single beep is heard to indicate the microphone sensitivity adjustment
function has been disabled.
N
OTE
:
When an XAAB001A is used to connect other accessories, the handset microphone sensitivity
adjustment is used for those devices.
Summary of Contents for ACC2500
Page 43: ...39 09 08 Circuit Boards...
Page 44: ...Circuit Boards ACC2500 Audio Control Center 40...
Page 45: ...ACC2500 Audio Control Center Circuit Boards 41...
Page 46: ...Circuit Boards ACC2500 Audio Control Center 42...
Page 47: ...43 09 08 Schematics...
Page 48: ...ACC2500 Audio Control Center Schematics 44 Desk Set Line Interface Sheet 1...
Page 49: ...ACC2500 Audio Control Center Schematics 45 Desk Set User Audio I O Sheet 2...
Page 50: ...Schematics ACC2500 Audio Control Center 46 Desk Set Control Microprocessor I O Sheet 3...
Page 51: ...ACC2500 Audio Control Center Schematics 47 Desk Set DSP Block Sheet 4...
Page 52: ...Schematics ACC2500 Audio Control Center 48 Desk Set Tone Key Panel Sheet 5...
Page 53: ...ACC2500 Audio Control Center Schematics 49 Desk Set Power Supply Sheet 6...
Page 54: ...Schematics ACC2500 Audio Control Center 50 Schematic Sheet 7...
