NCI Technologies NCI 100 User Manual - page 4
VOX CONTROL SETTING
DIP SWITCH SETTINGS
DIP SWITCHES (1-7)
Set the DIP switches according to your particular system
installation and requirements as follows.
Note: Switch 8 is not used.
A) DIP Switches 1&2 – TEL/MIC
If connected to a phone system page port set both
switches to the ON position.
If an external mic is connected, set both switches to the
OFF position.
B) DIP Switch 3 – VOX (Voice activated switch)
Set the switch to the ON position if the VOX option for
music mute is to be enabled.
C) DIP Switches 4 & 5 – TALK-BATT. (Talk Battery)
Set both switches to the ON position to enable this
function. This option provides talk battery to the
telephone set or telephone system C.O. trunk port.
D) DIP Switch 6 – PRE-TONE
Set this switch to the ON position to enable the
Pre-tone function.
E) DIP Switch 7 – NITE RINGER-TONE
Set this switch to the ON position to provide a normal
chime tone.
Set this switch to the OFF position to provide a high
frequency chime for noisy environments.
DIP Switches
VOX Control Setting
Control setting for VOX (Voice activated switch)
This trimpot adjusts the sensitivity of the VOX threshold
of the voice (Tel/Mic) input. To adjust the VOX
threshold, the following procedure should be followed:
1) Set the VOX control fully CCW (background music
should be on).
2) Have someone, such as the receptionist, make a
page call. During the page call slowly turn the VOX
control CW until the VOX circuitry triggers, the
background music cuts off and the page is heard
over the speaker(s).
3) Turn the control an additional 1/8 turn CW and leave
at this setting.
If the VOX function has a tendency to drop out,
slightly increase (CW) the control setting.
Notes:
1) The absence of speech for more than 4 seconds
releases the VOX and the background music comes
back on.
2) This adjustment is critical and may require some
experimentation.
VOX
VOX
Control
4
1 2 3 4 5 6
ON
7
TEL
MIC
1 2 3 4 5 6
ON
7
VOX enabled
VOX disabled
1 2 3 4 5 6
ON
7
TALK-BATT enabled
TALK-BATT disabled
1 2 3 4 5 6
ON
7
PRETONE enabled
PRETONE disabled
1 2 3 4 5 6
ON
7
Normal Chime
High Frequency Chime
A
B
C
D
E
1/8
Turn
Testing
Hello
Te s t i n g