Northern Airborne Technology PTA12-0xx - Manual (Page 18)

PTA12-000 POTS Telephone Adapter
SM55-1 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-2
ENG-FORM: 806-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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.
3.3.1.3 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.
3.3.1.4 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.
3.3.1.5 REDIAL
The REDIAL button recalls and dials the last number dialed (up to 32 digits). Note that this is volatile
storage, i.e.: the last dialed number is ‘cleared’ when the unit is powered down.
3.3.1.6 VOL
The VOL button is a momentary digital rocker-switch used to increase and decrease the phones output
volume within a pre-set range. Press the upper portion of the switch to increase the volume and the
lower portion to decrease the volume. There are 32 ‘steps’ from minimum to maximum volume to ensure
that a suitable level can be selected. Each
‘step’ requires a separate action of the push button – holding
the button in the ‘up’ or ‘down’ position will NOT scroll through the setting range. The volume level setting
is stored in
non-volatile memory, and will therefore need minimal adjustment on power up.
Section 3 ends