PTA12-000 POTS Telephone Adapter Manual
SM55 Rev. 4.00
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 in the headset. 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.
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.
End of section 3.0
Page 3-2
Nov 12, 2003
ENG-FORM: 806-0105.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
