Remote control protection system for population - has network with number of stations operating on principle of selective acceptance to give warning signal

摘要

The system has a central station for remote control, from which terminal stations can be reached through a remote control network with transit nodal stations, end nodal station and local nodal stations. The principle of selective acceptance is applied from the control station and up to local nodal stations, in which calling numbers are sent to all local nodal stations and evaluated there. Only the station with the same number accepts the connection. Local nodal stations are further connected to terminal stations by selective assignation, in which the call number decides in which direction the connection is to be extended.