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Drop cable for a local area network

  • US 4,733,389 A
  • Filed: 07/28/1986
  • Issued: 03/22/1988
  • Est. Priority Date: 07/28/1986
  • Status: Expired due to Fees
First Claim
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1. A multipoint data communication system for transmitting data to and from a plurality of communicating devices via an interconnecting cable, comprisingtransceiver means coupled to said interconnecting cable for coupling the interconnecting cable to a communication device and a communicating device to the interconnecting cable,drop cable means for coupling said transceiver means to said communicating device, and said communicating device to said transceiver means, said drop cable comprising two twisted pairs of wires with an overall shield, andcircuit means at said communicating device for interfacing between said communicating device and said drop cable, wherein three distinct signals and power are conveyed over the two twisted wire pairs in said drop cable utilizing a phantom signal technique of signal transmission,wherein said transceiver means includes three transformer means for transmitting said three distinct signals, the outputs of one of said transformers being connected to the center taps of the other two transformers, such that a signal introduced by said one transformer is directed to and forwarded by the other two of said transformers, wherein said three distinct signals are alternating current signals while the fourth element is direct current power, and wherein said fourth element representing power is kept separate from said third signal via capacitor means between the output of the other transformer and the center tap of one of said two transformers in both said transceiver means and said circuit means.

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