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Data communication system with increased effective bandwidth

  • US 4,521,881 A
  • Filed: 11/02/1981
  • Issued: 06/04/1985
  • Est. Priority Date: 11/02/1981
  • Status: Expired due to Term
First Claim
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1. A communication system with a network for interconnecting a plurality of user devices having means for transmitting signals to and receiving signals from said communications system, said communication system having means for providing a plurality of frequency multiplexed communication channels operating on different frequency bands for concurrent communication between said user devices,wherein one or more but not all of said channels are dedicated as local service channels employing designated local frequencies,said communication system including frequency selective isolation means connected into said network intermediately between user devices, thereby subdividing said network into a plurality of local subnets, each local subnet interconnecting a plurality of said user devices,said frequency selective isolation means including means for blocking only the frequencies used by said local service channels from being transmitted from any of said local subnets to another while enabling transmission of frequencies other than those used by said local service channels between user devices connected on different subnets to isolate said subnets from one another as to the local service channels only,said communication system providing communications on a particular one of said local frequencies between two of said user devices both connected on a first of said subnets while concurrently and without interference providing communications on the same particular local frequency between two of said user devices both connected on a second of said subnets, while concurrently and without interference providing communications on a frequency other than local frequencies between user devices connected on different subnets.

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