COE Communications Engineering Document
Author:
Keith Gilbertson
Rev:
A
Date:
3/08/02
Pag
e:
7
of
33
GE
TRANSPORTATION
SYSTEMS
GLOBAL SIGNALING DIVISION
Title:
12RII FCC TECHNICAL MANUAL
signaling. Audio interfaces on the front panel include a front panel microphone, which is activated with the front panel PTT
button, and a radio speaker.
Optionally, the radio may have an accessory connector (J6) that is used for external controls and audio interfaces or an
interface to a serial control head (J8). J8 provides the necessary serial, audio and control lines necessary to support a front
panel assembly that is packaged in a Remote Control Head.
J6 provides a second handset or microphone input, a second speaker output, and some I/O lines that can provide control inputs
or indication output signals depending on the customer application. As inputs these control lines can be programmed to provide
functions associated with handset cradle or hang-up functions such as Mute, Quiet Line Disable, and Channel Revert.
Additionally, certain customer applications require outputs that provide indications of radio status such as Standby, Busy or
TX.
The radio can support only the Accessory J6 connector or the Optional second control head on J8, not both at the same time
without compromised performance. Audio signals are shared between the two options. However it is not likely that both
options would ever be required in a given application. The radio may have both connectors installed, but only one interface is
likely to be active at a time. This will allow for a “standard” radio to be installed in either of the identified optional
installation configurations.
The radio receives power from the locomotive or car battery. Battery input voltages are 74VDC, or 37VDC. The radio
provides 13VDC outputs to power the accessory audio circuitry if necessary and to power the Serial Remote Control Head.
A connector is provided on the radio to interface to a standard personal computer (PC). This is an RS-2323 interface used to
upload and download radio configuration files, radio status or diagnostics, and radio firmware. These functions are supported
through a special application program “12RIISETUP” program which is loaded on the PC.
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