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Domestic satellite communication system

  • US 4,616,108 A
  • Filed: 08/01/1984
  • Issued: 10/07/1986
  • Est. Priority Date: 08/04/1983
  • Status: Expired due to Fees
First Claim
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1. A domestic satellite communication system including a central earth station and a plurality of subscriber earth stations, means at said central earth station responsive to a demand for controlling a frequency assignment of voice communication satellite channels in response to an occurrence of a call which identifies a subscriber earth station-to-subscriber earth station call, a central switching system for carrying out voice switching operations, and each of said plurality of subscriber earth stations serving at least one voice communication terminal,each of said subscriber earth stations comprising:

  • indication means for indicating that a call identified at said central earth station is for a subscriber earth station-to-subscriber earth station;

    means for monitoring the continuity of a communication channel at said voice communication terminal; and

    means for periodically transmitting an out-of-band signal in a voice communication satellite channel which is assigned by said central earth station while said monitoring means detects the continuity of a communication channel and said indication means indicates the subscriber earth station-to-subscriber earth station call,said central earth station comprising;

    means for demodulating said out-of-band signal transmitted from said subscriber earth station;

    means for receiving said out-of-band signal which has been demodulated by said demodulating means;

    means for monitoring the continuity of a communication channel between said subscriber earth stations by periodically reading out the output of said receiving means; and

    means for tuning the frequency of said demodulating means to coincide with a frequency assigned to said voice communication between said subscriber earth stations,whereby said subscriber earth station-to-subscriber earth station call is connected through one satellite link.

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