Nortel Networks Squelch Break Access Option, RTU-292 Operations Manual, After the Call Begins

RTU-292 Operations Manual

7.6 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-292. The radio user simply transmits a series of squelch breaks and is then automatically connected to the telephone at the RTU-292 speed dial location #01. To use the squelch break feature, the local radio’s squelch output must be connected to the RTU- 292 /External Signal Input, and the RTU-292 continuously monitors this line for the correct squelch break timing. The RTU-292 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-292 without this option and want to add it, contact JPS.

7.6.1Initiate Call Via Attention Signal

The radio user sends the “Attention” signal to the RTU-292. This is a series of 3 squelch breaks that occur within 4 seconds window.

7.6.2RTU-292 Response to Attention Signal

The RTU-292 will respond with the voice prompt “RTU-292 automatic phone patch”. The Acknowledge (ACK) Tone prompt is also given.

7.6.3RTU-292 Prompts for Confirmation

The RTU-292 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-292 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.

7.6.4RTU-292 Places the Call

The RTU-292 then informs the radio user that the call is being placed. The ringback information that is provided when placing a call via the RTU-292 front panel keypad or Local Phone is not sent over the air due to FCC regulations. The RTU-292 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-292 terminates the call attempt.

Once the RTU-292 detects ringback, the RTU-292 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.

7.6.5After 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-292 will give a series of 3 short beeps

7-13 JPS Communications, Inc.