Northern Airborne Technology PTA12-1xx - Manual (Page 25)

PTA12-100 POTS Telephone Adapter with Display
SM55-2 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-2
3.3 Controls and Indicators
3.3.1 Display
The PTA12-100 has a 16-character LED display, with each character block consisting of a 5x7 pixel
matrix as shown in Figure 1. Display features depend on the status of the unit and are described in the
relevant sections.
Brightness = 5
Figure 1: Front View
3.3.1.1 Display Brightness
The front panel BRT button controls display brightness. Each time the BRT button is pressed, the display
brightness increases by one step. In Default Power-Up mode only, the display will show the current
brightness level (1 through 8) until the next operator action. Once the maximum brightness (8) is reached
the brightness level wraps around to the lowest setting (1).
The display is dimmed to half brightness upon activation of the front panel backlighting.
3.3.2 Keypad Controls
The keypad controls are silicone rubber tactile push-buttons backlit by amber LEDs, and are used to
manage all the operator functions of the PTA12.
3.3.2.1 Number and Symbol Buttons
The number (0 through 9) and symbol (*, #) buttons on the keypad have different uses depending on the
selected mode. Full information will be given in the relevant sections and in the keypad function table in
Section 3.6.
3.3.2.2 HOOK
The HOOK button is pressed to initiate or receive a call. This corresponds to lifting the handset of a
telephone ‘off the hook’. Each time the HOOK button is pressed, the hook switch toggles on / off.
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
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