l*lnat
PTA12-300
POTS
Telephone
Adapter with NVIS
Display
SM55-2 lnstallation
and Operation
Manual
Section 3 Operation
3,1 lntroduction
lnformation
in this section
consists of
functional
and operational
procedures
for the PTA12-300
POTS
Telephone
Adapter with NVIS Display.
3.2
General lnformation
The PTA12-300 POTS
Telephone Adapter with NVIS display is
a
keypad control and display unit for
airborne telephone
system applications. The
PTA12-300
connects to a telephone system transceiver by a
two-wire
POTS
(Plain
Old Telephone
Service) interface. The PTAI2-300 can be connected to the aircraft
audio controlle(s) or
directly to an aviation headseUhandset.
Note: The
PTA12-300 is designed to meet standard North American PSTN requirements, but it is
not
recommended
or approved for landline
applications.
The
PTAI2-300 POTS
Telephone Adapter is a compact Dzus mounted POTS telephone interface with
a
keypad
and display. Many
of the PTA12-300
functions
are controlled by a
microcontroller.
The functions
of the PTAI2-300 include:
speech audio circuits, hook switch,
ring indication, flash,
hold,
redial,
serial data communications,
backlighting,
display,
speed dial, Globalstarru satcom status,
DTMF
tone
generation
and
ringer
audio
generate.
The speech audio circuits include a mic input amplifier and
a
phones
output
amplifier
with front
panel
volume control.
Hook
switch control and indication is
provided
on
the front
panel.
The hook switch may
be controlled and
its
status
viewed
from a location remote to the PTAI2-300 front
panel.
Ring indication is also
provided
on
the front
panel
with a flashing
green
LED. A FLASH button is
provided
on the front
panel
to interrupt the
hook,
A HOLD
button on
the front
panel
mutes all audio to and from the
headset
and
is indicated
by a
green
LED.
A REDIAL button
on the front
panel
automatically redials
the last number
called.
The interface to the
satcom system transceiver is achieved by a two-wire POTS
port.
A serial
port
allows
for
data communications
to satcom systems.
The front
panel
keypad has NVIS compliant backlighting
provided.
The display is an LED dot matrix
character display with
brightness control. The display is filtered for NVIS radiance
requirement.
Speed dial
allows numbers to be stored and recalled from memory.
lndication
of Globalstarw satcom signal strength
and
system availability status is
provided
by LED lit
dead-front text
on the
front
panel.
Section 3 Rev: 1.00 lssue
4
Page
3-1
ENG-FORM: 806-0'l
1 2.DOT
CONFIDENTIAL
AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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