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RTU-292C Operations Manual
6-5
6.4
SQUELCH BREAK ACCESS OPTION
This option allows a radio user who does not have DTMF capability to quickly place a telephone
call via the RTU-292C. The radio user simply transmits a series of squelch breaks and is then
automatically connected to the telephone at the RTU-292C speed dial location #01. To use the
squelch break feature, the local radio’s squelch output must be connected to the RTU-292C
/External Signal Input, and the RTU-292C continuously monitors this line for the correct squelch
break timing. The RTU-292C will respond to either a positive going or negative-going squelch
signal.
NOTE
It is possible to enable this option remotely. If you have purchased an RTU-292C
without this option and want to add it, contact us.
6.4.1
Initiate Call Via Attention Signal
The radio user sends the “Attention” signal to the RTU-292C. This is a series of 3 squelch breaks
that occur within 4 seconds window.
6.4.2
RTU-292C Response to Attention Signal
The RTU-292C will respond with the voice prompt “
RTU-292C automatic phone patch”.
The
Acknowledge (ACK) Tone prompt is also given.
6.4.3
RTU-292C Prompts for Confirmation
The RTU-292C then requests confirmation with the prompt "
Please confirm with a single squelch
break
”. The caller confirms his desire to call by giving 1 additional short squelch break within
5 seconds. If the RTU-292C does not receive confirmation within that time, it will give a
"Timeout" tone prompt, terminate the attempt to call, and go back to its waiting state.
6.4.4
RTU-292C Places the Call
The RTU-292C then informs the radio user that the call is being placed. The ringback
information that is provided when placing a call via the RTU-292C front panel keypad is not sent
over the air due to FCC regulations. The RTU-292C adapts to the phone line while placing the
call.
If the number is busy, the busy tones will be broadcast for approximately 5 seconds before the
RTU-292C terminates the call attempt.
Once the RTU-292C detects ringback, the RTU-292C begins a 30 second timer and waits for the
call to be answered. If this does not happen before the timer expires, the call attempt is
terminated.
6.4.5
After the Call Begins
The call can now proceed, and the Inactivity Timer will now begin to run. If this time expires
(because no speech or other activity is heard), the RTU-292C will give a series of 3 short beeps
as a warning. The radio caller or the phone user may initiate activity within 5 seconds of the
warning beeps to reset the timer. If neither user does so, the unit will then terminate the call.
Содержание RTU-292C
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