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Central station system including secondary communication path established through commercial telephone network

  • US 4,119,815 A
  • Filed: 05/31/1977
  • Issued: 10/10/1978
  • Est. Priority Date: 05/31/1977
  • Status: Expired due to Term
First Claim
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1. In a central station system including a central station, at least one remotely located bridging point having a plurality of output ports and serving a plurality of remote stations, each of which is connected to a respective one of the output ports, and normal telecommunication means for transmitting signals between the central station and the bridging point, apparatus for connecting the central station to selected remote stations comprising:

  • means associated with the central station for generating address signals applied to the normal telecommunication means;

    means associated with the bridging point for connecting the normal telecommunication means to the output port identified by the address signals and for isolating all other output ports form the normal telecommunication means; and

    means for establishing an alternative telecommunication path between the central station and the bridging point through the commercial telephone network to which the address signals are applied and the identified output port is connected in the event of failure of the normal telecommunication means.

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