Two-way RF communication at points of convergence of wire pairs from separate internal telephone networks

DC CAFC
  • US 5,844,596 A
  • Filed: 03/11/1997
  • Issued: 12/01/1998
  • Est. Priority Date: 07/14/1989
  • Status: Expired due to Term
First Claim
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1. A system for video signal communication between a source thereof and a plurality of units, each unit including at least one destination of said video signal, said system comprisingan interface coupled (a) to said source, (b) to two-wire telephone lines, each of said telephone lines serving at least one of said units and carrying voice signals to and from one or more telephones coupled to said line at said unit, and (c) to a telephone exchange, said interface includingcircuitry for receiving said video signal from said source,circuitry for transmitting said received video signal onto at least one of said telephone lines in a selected frequency range that is different from frequencies at which said voice signals are carried on said one telephone line to cause said video signal to be coupled to a receiver connected to said telephone line at the unit served by said line, said receiver being adapted to recover said video signal from said telephone line and apply said recovered video signal to said at least one destination of said video signal at said unit, andcircuitry for concurrently passing said voice signals between said telephone lines and said telephone exchange, and preventing transmission of said received video signal to said telephone exchange.

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