PUMA T2
Technical Handbook
Technical description
P/N: 779-0306/01
Revision 03
OTE Proprietary information
Page 39
PRES-AL: Digital signal with indication of presence of an external power supply
available at the terminal external connector.
Coding: PRES-AL = GND/Floating == > External power supply present/absent.
ON/OFF: Digital signal to turn the terminal on or off.
Coding: ON/OFF = GND/Floating == > ON/OFF.
MIC-EP, MIC-EN: Differential analogue audio signal coming from an optional
external microphone.
The line is supplied from the base band card to connect a microphone with
impedance of 16 KOhm, and Vpp=12 mV.
VCC: +3.3 V power supply for volume control.
VOL-COM: Analogue signal for volume control from the associated MMI circuit,
with a level between 0 and +3.3 V. Such a level, quantified and codified by the µC
for discrete intervals, indicates the power at which the audio signal must be output
to the loudspeaker (internal or external).
CAN1, CAN2, CAN3, CAN4: Digital signal for Channel Command, coming from
the switch channel with 0 and +3.3 V level. By turning the selector rotary knob in
one of the 16 positions, you can change the coding in COM1, COM2, COM3,
COM4 terminals, that are read directly by the µC.
AP-IN1, AP-IN2: Analogue signals for differentially driving the loudspeaker in the
terminal, with electrical levels of between GND and VBI. The loudspeaker
impedance must be 25 Ohm.
P-AUX2: Analogue line to indicate the type of audio accessory links with external
auxiliary audio connector, with electrical level between 0 and 3.3 V. Such level, is
quantified and codified by the µC with integrated AD converter.
PTT: Digital signal controlling internal Push To Talk.
Coding: PTT= GND/Floating ==> Push To Talk control active/inactive.
PUSH: Digital signal for signalling with auxiliary button, available for particular
applications.
Coding: PUSH = GND/Floating. ==> Push To Talk command active/inactive.
ALARM: Digital signal for signalling with auxiliary button, for alarm signal.
Coding: ALARM = GND/Floating. ==> Alarm command active/inactive.
RED LED, GREEN LED: Closing red/green led supply voltage. A 1 KOhm
resistance (placed on the base band card) limits the current.
The RT connector exchanges signals between the BB and the RT board and it is
integrated. Physically, it is made up of a connector having 25 in-line pins, male
from the base band side.
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