Northern Airborne Technology PTA12-1xx - Manual (Page 12)

PTA12-100 POTS Telephone Adapter with Display
SM55-2 Installation and Operation Manual
Section 2 Rev: 1.01
Issue 4 Page 2-3
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.2 Power On Checks
Notes: 1. PTA12-100 functionality is highly dependant on the airborne telephone system interface.
Check proper operation of the telephone transceiver, and check that the transceiver has
an activated telephone line.
2. Where the PTA12-100 is connected to an existing audio system, check that the PTA12-100
is properly selected when performing audio checks.
Power up the aircraft’s systems and confirm normal operation of all functions of the PTA12-100. Refer to
Section 3 (Operation) for specific operational details.
a) Initiate a call to a valid telephone number and verify the operation for HOOK, HOLD, DTMF
keys (0 – 9, *, #) and VOL. Re-initiate the call using REDIAL. Test the FLASH function (where
applicable) while in the off-hook state (active).
b) Place the PTA12-100 in the on-hook (inactive) state, and have another party call the line
connected to the PTA12. Confirm proper RINGER, HOOK and HOLD operation.
c) To verify proper operation, all functions and levels shall be checked in-flight.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.5 Adjustments and Connections
The following adjustments are accessible through holes in the side of the unit shown in Figure 1.
Figure 1: Adjustments
Rotating the trimpots cw will increase the level of the related output and ccw
will decrease it.
Internal Trimpot Adjustments
LTS
adjusts keypad backlighting level from min 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
Internal Switch Settings
RGR
on [down] ringer audio available on both phones
(ringer select) and ringer audio outputs
off [up] ringer audio only available on ringer audio
output
FLA / FLB
select FLA flash = 90 ms ±40 ms
(hook flash) select FLB flash = 600 ms ±100 ms
MIC on [down] mic bias supplied by PTA12
(mic bias) off [up] mic bias not supplied