Ringdown (Radio)
Ringdown (Radio) : A radio, incorporating a selective calling capability, has an attention-getting device triggered by a dispatching center. A triggered device emits a sound alerting staff at a fire station, in an ambulance, on a vehicular radio or at a vehicular data terminal that an emergency call is pending. The act of ringing down a station may ring bells, activate a klaxon, turn off gas-fired cooking appliances, activate a volunteer alerting siren, turn on lights, and activate loudspeakers over which the call details are announced. Some systems use the voice path of a private line telephone circuit or a voice channel on a microwave radio instead of a two-way radio. Ringing down a vehicle may cause the radio or data terminal itself to beep continually until an "acknowledge" button is pressed
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