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RTU-292 Operations Manual
3.4 OPERATION
3.4.1 OPERATION OVERVIEW
The RTU-292 is a flexible piece of equipment that contains a telephone and a radio/telephone
interface circuit with a unique adaptive hybrid. These circuits are arranged so that they can be
used together or independently in several different ways. The unit may be used to manually
create the telephone to radio connection, or an unmanned connection can be made in the
automated mode. Here are some examples of RTU-292 operating modes:
1. The telephone may be used to place and receive calls independently of the radio interface.
2. The speaker may be used to monitor radio traffic while the handset is used with the internal
telephone to place a telephone call.
3. The handset may be used to transmit/receive from the radio.
4. The radio may be connected to the phone line through the adaptive hybrid.
5. A phone call may be patched through to a radio link, or a radio link patched into a phone
line. This can be accomplished unattended using a pair of RTU-292s in the Automated
Mode.
The following paragraphs describe the RTU-292 operating modes in detail.
3.4.2 USE OF THE RTU-292 SPEAKER TO MONITOR AUDIO
1. To monitor radio receive audio, push the SPEAKER/RADIO button. The associated LED
will light.
2. To monitor telephone audio, push the SPEAKER/PHONE button. The associated LED will
light. Either the TEL LINE/PHONE or the TEL LINE/RADIO LED must be ON,
indicating that the telephone is off-hook, or there will be no audio present.
3. Note that radio receive audio and telephone audio may be simultaneously monitored.
3.4.3 PLACING A TELEPHONE CALL
1. Ensure that telephone audio will be available at the handset (HANDSET/PHONE LED is
ON).
2. Connect the RTU-292 to the outside phone line by pressing the TEL LINE/PHONE button;
listen for the dial tone.
3. When dial tone is heard, dial the desired number using the keypad. The handset will
function like an ordinary telephone handset.
4. If desired, the phone conversation may also be monitored via the front panel speaker by
depressing the SPEAKER/PHONE switch (SPEAKER/PHONE LED ON). Prevent
feedback by controlling speaker volume and keeping the handset a sufficient distance from
the speaker.
5. To hang up, press the TEL LINE/PHONE button, or the TEL-LINE OFF button, so that the
TEL LINE/PHONE LED goes out.
JPS Communications, Inc.
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