Civil defence warning system - uses telephone system to transmit signals triggering alarm stations
A nationwide warning system for alerting the civilian population uses the public telephone system to provide connection and activation of sirens. The system is based upon a centralised control point connecting through sub-stations and branch points. The alarm units that tare distributed nationally a...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | A nationwide warning system for alerting the civilian population uses the public telephone system to provide connection and activation of sirens. The system is based upon a centralised control point connecting through sub-stations and branch points. The alarm units that tare distributed nationally are activated when a coded signal is generated. The coded signal consists of frequency samples in the range 1700 to 2040 Hz. |
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