GE Transportation Systems Global Signaling LLC GS12RII-V1 Manuel D’Utilisation
COE Communications Engineering Document
Author:
Keith Gilbertson
Rev:
A
Date:
3/08/02
Pag
e:
27
of
33
GE
TRANSPORTATION
SYSTEMS
SYSTEMS
GLOBAL SIGNALING DIVISION
Title:
12RII FCC TECHNICAL MANUAL
A standard clean cab (LC) radio uses Speaker 1 to drive the front panel speaker.
A standard AAR remote radio uses Speaker 2 output coupled through transformer T1 to drive an 8 ohm grounded speaker. The
level is fixed and volume control is external to the radio.
level is fixed and volume control is external to the radio.
A clean cab radio with optional interface uses Speaker 2 output to drive an external radio speaker. In this application the
external speaker level can be fixed where external volume control is used or it can tracks the radio volume control used for
Speaker 1 output. This is determined by settings in the radio configuration file.
external speaker level can be fixed where external volume control is used or it can tracks the radio volume control used for
Speaker 1 output. This is determined by settings in the radio configuration file.
If a second control head is used, the speaker 2 output is used to drive the speaker in the optional control head. The speaker
output level will track the volume adjustments made from control head 2 independent from the volume controls made in the
radio front panel or control head 1.
output level will track the volume adjustments made from control head 2 independent from the volume controls made in the
radio front panel or control head 1.
10.4. External I/O Interfaces
10.4.1. Handsets & PTT Inputs
The radio handset (J2) input signals are the PTT and Hook Switch. The PTT input goes low to activate the transmitter when the
handset PTT button is pressed. The Hook Switch input is connected to a cradle switch and used for various controls such a
channel monitor, Scan Start/Stop, and Channel Revert. Each of these circuits for these two signals are the same. A small value
series impedance feeds a pull up resistor and bypass capacitor. The input is then dc blocked by a series diode that only allows
current to flow out the input. This protects the digital radio processor module input that is pulled up to +5V.
The HPTT and HK inputs are monitored by the RPM and will initiate a radio transmission if HPTT goes low or provide the
necessary function assigned to HK should it go active.
handset PTT button is pressed. The Hook Switch input is connected to a cradle switch and used for various controls such a
channel monitor, Scan Start/Stop, and Channel Revert. Each of these circuits for these two signals are the same. A small value
series impedance feeds a pull up resistor and bypass capacitor. The input is then dc blocked by a series diode that only allows
current to flow out the input. This protects the digital radio processor module input that is pulled up to +5V.
The HPTT and HK inputs are monitored by the RPM and will initiate a radio transmission if HPTT goes low or provide the
necessary function assigned to HK should it go active.
The Remote PTT input is the primary PTT input used in the AAR Remote radio through connector J5 interface. This input is
also available in the clean cab version with option accessory connector J6 for interface into a remote communication panel.
This input circuit uses a comparator device (U19-A) to convert 13V logic to 5V logic. A series impedance (R67) is used to
feed the input bypass cap (C77) and pull-up resistor R4. Diode D4 is used to clip small signal transient spikes lower than
radio common or higher than B+. The input is coupled into U19-A positive input at pin 3. If this input is lower than the
reference voltage at the negative input at pin 2, the output will go low. The RPTT signal is monitored by the RPM and will
initiate radio transmit.
also available in the clean cab version with option accessory connector J6 for interface into a remote communication panel.
This input circuit uses a comparator device (U19-A) to convert 13V logic to 5V logic. A series impedance (R67) is used to
feed the input bypass cap (C77) and pull-up resistor R4. Diode D4 is used to clip small signal transient spikes lower than
radio common or higher than B+. The input is coupled into U19-A positive input at pin 3. If this input is lower than the
reference voltage at the negative input at pin 2, the output will go low. The RPTT signal is monitored by the RPM and will
initiate radio transmit.
10.4.2. Programmable I/O
IO-1, IO-2, IO-3, and IO-4 signals are provided to allow for custom input and output interfaces. The function of each of the I/O
signals is set in the radio configuration file. All four I/O signals are available in Remote connector J5 for us in an AAR
Remote radio. IO-3 and IO-4 are used in normal front panel operation for identification and enabling of the front panel
operation. IO-1 and IO-2 are used in the clean cab radio optional accessory connector interface or for the optional second
control head identification and enabling. Each of the I/O circuits is identical. IO-1 circuit operation is as follows;
signals is set in the radio configuration file. All four I/O signals are available in Remote connector J5 for us in an AAR
Remote radio. IO-3 and IO-4 are used in normal front panel operation for identification and enabling of the front panel
operation. IO-1 and IO-2 are used in the clean cab radio optional accessory connector interface or for the optional second
control head identification and enabling. Each of the I/O circuits is identical. IO-1 circuit operation is as follows;
10.4.3. AAR Channel Inputs
The AAR channel selection is done with 5 input lines. These 5 lines are separated into 4 channel select lines and a channel
return line. 12 Channel remote control is defined per AAR channel table logic.
return line. 12 Channel remote control is defined per AAR channel table logic.