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CATV network with addressable filters receiving MSK upstream signals

  • US 4,982,440 A
  • Filed: 04/21/1989
  • Issued: 01/01/1991
  • Est. Priority Date: 04/21/1988
  • Status: Expired due to Fees
First Claim
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1. A CATV network comprising a bidirectional trunk for connection to a head end and bidirectional distribution lines connected to the trunk to which subscriber drops can be connected for carrying wideband downstream CATV signals, the head end including means for receiving upstream signals, the distribution lines including means for transmitting said upstream signals in at least one narrow frequency band, bandpass filter means connected in the upstream direction in each of the distribution lines having passbands corresponding to said at least one narrow frequency band for blocking upstream noise and signals which may appear on the distribution lines outside of that contained in said at least one narrow frequency band, each filter means including a gate for blocking all upstream signals, means in each filter means for receiving an address signal carried downstream on said distribution lines and for opening said gate upon said gate receiving said address signal.

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