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RTU-292 Operations Manual
3.2.6 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.
3.2.7 SPEAKER VOLUME CONTROL
This potentiometer controls the volume of audio (except telephone ringer volume) at the front
panel speaker. Rotate clockwise to raise audio from minimum to full. Telephone ringer
volume is controlled independently by an internal adjustment, R156 (see section 2.8).
3.2.8 PHONES VOLUME CONTROL
This potentiometer controls the signal level present at the front panel headphone jack and in the
handset earpiece. Rotate clockwise to increase the audio level.
3.2.9 TEL LINE BUTTONS
These three buttons, PHONE, RADIO and OFF, determine whether the internal telephone, the
radio, both, or neither (OFF) are connected to the telephone line.
Pushing the TEL LINE/PHONE button connects the RTU-292 internal telephone to the
telephone line and allows dialing using the keypad. Pushing this button will also answer an
incoming telephone call. The associated LED will be illuminated while the telephone line to
internal phone path is selected.
Pushing the TEL LINE/RADIO button connects the telephone line to the radio through the DSP
adaptive hybrid. The unit then starts its adaptation cycle by putting a burst of white noise onto
the telephone line. When the adaptation cycle is underway, the TEL LINE/RADIO LED will
flash. After successful completion of the adaptation cycle, this LED will be on continuously,
indicating that the unit is ready for operation.
The TEL LINE/OFF pushbutton will hang up any active TEL LINE/RADIO or TEL
LINE/PHONE connection.
3.2.10 HANDSET BUTTONS
These two buttons, PHONE and RADIO, allow the handset to be connected to the internal
telephone, the radio, or both simultaneously. Each button has an associated LED that is
illuminated when the path is active.
Pushing the HANDSET/PHONE button connects the handset to the telephone audio path ad
activates the handset microphone. Note that this will not take the telephone off-hook; the TEL
LINE/PHONE LED must also be on for the handset to be used to communicate over the
telephone line.
Pushing the HANDSET/RADIO button selects the handset to the radio audio path. When this
path is selected (HANDSET/RADIO LED is on) the handset PTT switch will key the radio
transmitter.
If both paths are simultaneously selected, the audio heard in the earpiece will be the radio
receive and telephone audio mixed together, and microphone input will be sent both to the
telephone line and to the radio transmitter.
JPS Communications, Inc.
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