GAI-Tronics L3149B C200 Advanced Deskset - Manual (Page 51)

L3149B (C200) Advanced Tone Remote Desk Set Programming
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Accessory Mic Bias
The mic bias for the accessory connector should be enabled if an electric condenser mic is used for
transmit audio. Enabling this parameter allows approximately 4 volts of mic bias to be applied to the
accessory mic high input.
Accessory PTT Polarity
 If attached accessory uses a normally open switch for PTT with a closure to ground, this should be
set for low active.
 If attached accessory uses a normally closed switch for PTT and when PTT is asserted the switch is
opened, it should be set for high active.
 If the attacked accessory uses a normally closed switch for PTT and when PTT is asserted the switch
is opened, this parameter should be set for high active.
N OTE : The desk set contains an internal pull-up resistor. If the polarity is set for active high, and no
device is connected, the desk set keyboard may stop responding. Ensure that the type of mic and this
setting are properly set.
Accessory Monitor Polarity
If the attached accessory uses a normally open switch for monitor with a closure to ground, this
parameter should be set for low active. If the attached accessory uses a normally closed switch for
monitor and when monitor is asserted the switch is opened, this parameter should be set for high active.
N OTE : The desk set contains an internal pull-up resistor. If the polarity is set for active high and no
device is connected, the desk set keyboard may stop responding. Ensure that the type of mic and this
setting are properly set.
Parameters - Line Configuration
Number of Frequencies/Currents
Displays the number of functional transmit frequencies that can be programmed for the specified
interface type. It changes along with the type of interface selected. If the type of interface is:
E&M ( without tone) - maximum is 1.
Tone or E&M with Tone - maximum is 16.
Local - maximum is 1.
Note that any available frequency may be disabled in the frequencies/currents screen. The number of
frequencies available does not change here. However, the frequencies/currents beyond and including the
disabled frequency/current will not be available to the operator for selection. The frequencies/currents
beyond the disabled frequency/current can, however, be used for a particular Auto PTT Frequency for
paging.
For example, if F1 through F2 is set, but F3 is disabled, and F4 is set, the operator will only be able to
select F1 or F2 for dispatch. However, F4 can be selected during programming to be a page PTT
frequency. The desk set will use F4 for the page and revert or not revert back to the previous frequency
after the page. The desk set will use F4 for the page and revert or not revert back to the previous
frequency after the page.