RTU-292C Operations Manual
3-4
3.3.2
J1 TEL LINE
The RJ11C jack provides the telephone line connection to the RTU-292C.
3.3.3
J2 LOCAL PHONE CONNECTOR
This RJ-11C jack is used to connect a local phone to the unit. The Local Phone Option must be
installed for this port to be active.
[This option no longer available.]
3.3.4
P2 RS-232 CONNECTOR
This female DB-9 connector provides an interface between the RTU-292C and a radio or a
controlling terminal via standard RS-232 signal lines.
3.3.5
DC INPUT TERMINAL BLOCK
This two-position terminal strip has a pair of screw terminals, one for a ground wire and another
for the DC input of 12 or +24/+28VDC (nominal). Internal slide switch S6 is used to
select b12 and +24/+28 volt input. Refer to Section 2.7.
3.4
OPERATION
3.4.1
OPERATION OVERVIEW
The RTU-292C 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-292C 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-292Cs in the Automated Mode.
The following paragraphs describe the RTU-292C operating modes in detail.
3.4.2
USE OF THE RTU-292C 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).
Summary of Contents for RTU-292C
Page 4: ...RTU 292C Operations Manual 4 Blank Page...
Page 12: ...RTU 292C Operations Manual 12 This page intentionally left blank...
Page 35: ...RTU 292C Operations Manual 2 17 Figure 2 1 Outline Dimensions...
Page 37: ...RTU 292C Operations Manual 2 19 Figure 2 3 Location of Internal Option Settings...
Page 38: ...RTU 292C Operations Manual 2 20 Figure 2 4 Internal Option Settings Details...
Page 39: ...RTU 292C Operations Manual 2 21 Figure 2 5 Audio Interface Wiring Diagram...
Page 40: ...RTU 292C Operations Manual 2 22 Figure 2 6 Interface Details...
