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RTU-292 Operations Manual
3 Operation
3.1 GENERAL
This section contains information and instructions required for proper operation of the RTU-
292.
3.2 FRONT PANEL CONTROLS, INDICATORS AND CONNECTORS
3.2.1 MAIN POWER SWITCH
The Main Power switch controls the external DC power to the unit. The switch is a locking
toggle type to prevent inadvertent operation.
3.2.2 HEADPHONE JACK
This front panel jack accepts a standard 1/4 inch diameter monaural phone plug. The output
will drive low, medium, or high impedance headphones. The phones audio level is adjustable
via the PHONES VOLUME control on the right side of the panel.
3.2.3 HANDSET JACK
This front panel jack is a standard 6-pin RJ12C jack that connects the handset to the unit.
3.2.4 HANDSET
The handset allows sending and monitoring audio to and from either the telephone line, the
radio, or both, depending on the HANDSET/PHONE and HANDSET/RADIO pushbutton
selections. The handset also has a PTT (Push-To-Talk) switch to key an associated radio. The
handset PTT switch is active only when any of the following functions are selected (associated
LEDs on): TEL LINE/RADIO, HANDSET/RADIO, or SPEAKER/RADIO. The PTT switch
need not be depressed when communicating with a second party via a PSTN line. The handset
earpiece audio level is controlled by the HANDSET volume control. A convenient hanger for
the handset may be attached to the left side of the front panel (mounting screws are installed in
the front panel, remove the nuts from these screws, throw the nuts away, and use the screws to
attach the hanger). This hanger, supplied in the RTU-292's accessory kit, may also be installed
elsewhere on the equipment rack.
3.2.5 SPEAKER
The speaker allows monitoring of telephone line and/or radio audio, depending on the
selections of the SPEAKER/PHONE and SPEAKER/RADIO monitor modes. In addition, the
speaker serves as the telephone ringer for incoming calls. The speaker volume (except for the
ring signal) is controlled by the SPEAKER volume control located on the right side of the front
panel. The ring signal may be enabled or disabled by the AUDIBLE RING pushbutton. The
ring volume is controlled by an internal potentiometer R156 (see section 2.8).
JPS Communications, Inc.
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