Northern Airborne Technology PTA12-0xx - Manual (Page 11)

PTA12-000 POTS Telephone Adapter
SM55-1 Installation and Operation Manual
Section 2 Rev: 1.01
Issue 4 Page 2-4
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.5 Adjustments and Connections
The following adjustments are accessible through holes in the side of the unit.
*FL B (hook flash) on [down] flash = 600 ms ± 10%
off [up] 600ms hook flash disabled
*FL A (hook flash) on [down] flash = 90 ms
± 10%
off [up] 90ms hook flash disabled
MIC (mic bias)
on [down] mic bias supplied by PTA12
off [up] mic bias not supplied
2.5.1 Internal Trimpots
Rotating the trimpots cw will increase the level of the related output, and ccw will
decrease it.
LTS adjusts keypad backlighting level from off to max
DTMF adjusts DTMF level on POTS interface
S/T adjusts sidetone level
RX adjusts receive level on phones output
MIC adjusts mic level on POTS interface
RGR adjusts ringer level on both ringer audio and phones output
2.5.2 Internal Switches
RGR (ringer select) on [down] ringer audio available on both phones and
ringer audio outputs
off [up] ringer audio only available on ringer audio
output
* One of FL A or FL B
must be selected ‘on’ for
proper hook switch
operation