Nat PTA12-100, Installation And Operation Manual

Page: 45 / 52

SM55 Rev.
4
.00 PTA12-100 POTS Telephone Adapter with Display Manual
The ‘hook status / ringer active’ annunciator is a green LED above the HOOK button.
The LED is off when the unit is inactive (‘on-hook’), and will illuminate continuously
when the unit is active (‘off-hook’). If the unit is inactive (‘on-hook’), this LED also acts
as a ‘Ringer Active’ annunciator by flashing when an incoming call activates the audible
ringing tone on the Ringer Audio output, or in the headset, depending on the installation
setting. If 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 external input key. The Hook key on the
PTA12-100 front panel has master control of the Hook switch control. When the
PTA12-100 is configured for remote hook control and PTA12-100 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 may be released
by de-selecting the PTA12-100 on the audio panel.
The PTA12-100 may be configured to indicate Hook status remotely. In this
configuration, an external annunciation device may be used to indicate the status of the
PTA12-100 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 mic 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 deal with a second call. This feature is only available when
the unit is active (‘off-hook’) or in Call mode.
3.3.2.5 REDIAL
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.
Sep 21, 2004 Page 3-3
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.