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RTU-292C Operations Manual
3-1
3
Operation
3.1
GENERAL
This section contains information and instructions required for proper operation of the RTU-
292C.
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
HANDSET JACK
This front panel jack is a standard 6-pin RJ12C jack that connects the handset to the unit.
3.2.3
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-292C's accessory kit, may also be installed elsewhere on the
equipment rack.
3.2.4
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 0).
3.2.5
KEYPAD
The 12-key keypad is used for telephone dialing. It is active only when the TEL LINE/PHONE
path is selected. Dialing may be either via DTMF mode or pulse mode as determined by internal
dipswitch selection.
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