Nortel Networks Operation Overview, USE of the RTU-292 Speaker to Monitor Audio

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.

3.4.2USE 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.

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