:*lnat
PTA12-300
POTS Telephone Adapter with NVIS Display
SM55-2 lnstallation
and Operation Manual
flashing when
an
incoming
call
activates the audible
ringing
tone on the Ringer
Audio
output, or in the
headset,
depending on the installation
setting. lf the unit
is
already
in
use
('off-hook'),
the new caller will
generally
hear a
'busy'
signal
(depending
on
the telephone
system
transceiver used).
Note: The
Ringing Detect circuit that
activates the
headset ringer,
the Ringer
Audio
output and the
flashing LED
also sends a signal to a further discrete output for a remote indicator
(light
bulb,
etc.) if required.
The hook
switch
may
also be controlled
by an external input.
The HOOK
button on the
PTA12-300
front
panel
has
master control of the hook
switch control. When the
PTA12-300 is
configured
for
remote hook
control and PTAI2-300
has been selected
by an
audio
panel
TX
selector,
pressing
the PTT for
at least
0.5 second will active the hook
switch
(like
pressing
and releasing the HOOK button). The hook
switch
may
be released
by deselecting the PTAI2-300 on the audio
panel.
The PTA12-300
may be configured
to
indicate
hook status remotely. ln this configuration, an external
annunciation
device may be used to indicate
the status of the PTAI2-300
hook
switch. This is a discrete
output that follows the hook
status
3.3.2.3
HOLD
The HOLD
button allows the operator
to
put
a call
'on
hold' by muting the microphone and
phones
audio
This feature
is only available when the
unit is active
('off-hook').
The hold status
annunciator is a
green
LED
below
the HOLD
button.
The LED illuminates to
indicate that
a call is on hold,
and switches off when the
call audio
is returned to
active
status.
3.3.2.4
FLASH
The FLASH
button is typically used in
a system where
'call
waiting' and
'call
transfer'
are supported.
When the
unit is active
('off-hook'),
the FLASH
button is used to interrupt a call and allow the user to
respond to
a second call. This feature is
only available when the unit
is
active
('off-hook')
or in Call mode
3.3,2.5
REDTAL
The REDIAL
button recalls and dials the last
number dialed
(up
to 16 digits).
This is the
number dialed
between an
off-hook and on-hook cycle. This is non-volatile
storage,
i.e.: the last dialed number
is
'stored'
when the
unit is
powered
down.
Pressing REDIAL
in Call mode recalls the last number
dialed, shows
it on the display
and dials it
immediately.
lf the unit is in Default
Power-Up mode when the
REDIAL button
is
pressed,
the last number
dialed is
shown
on the display. To dial this number, first
press
the HOOK switch
to
confirm a dial tone is
present
and then
press
the ENTR button to send the DTMF
tone on
the two-wire interface.
Note: lf
there
are
no numbers in the redial
buffer, the screen
will
display
Empty!
and no number will be
dialed.
Section 3 Rev:
1,00 lssue 4 Page
3-3
ENG-FORM:806-01
12 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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