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Passive transmission of data over cable TV systems

  • US 4,677,686 A
  • Filed: 06/10/1983
  • Issued: 06/30/1987
  • Est. Priority Date: 06/10/1983
  • Status: Expired due to Fees
First Claim
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1. A passive data transmission system for a two-way coaxial cable system having repeaters, the repeaters having diplexers to split the transmission spectrum into a high frequency band and a low frequency band, the data transmission to take place in either direction on the low frequency band without amplification, comprising:

  • a plurality of subscriber terminals comprising means for concurrently and continuously transmitting digitally encoded data from all the subscriber terminals at different radio frequencies on the low frequency band and wherein each subscriber terminal is allocated a plurality of digital data channels, each subscriber terminal comprising;

    means for generating different data signals for each allocated digital data channel to be transmitted;

    means for encoding the data for transmission;

    means for generating a different low band carrier frequency for each subscriber terminal;

    means for connecting each subscriber terminal to the coaxial cable system so that the encoded data from each subscriber is transmitted at the different low band carrier frequencies, each subscriber terminal continuously transmitting on a different one of the carrier frequencies;

    means for receiving the encoded data transmitted on the cable system comprising;

    means for connecting the receiving means to the coaxial cable system so that the encoded data from each subscriber is continuously and concurrently received at the plurality of low band carrier frequencies;

    a plurality of modems, each receiving data from a plurality of subscribers;

    scanning means for scanning the plurality of modems;

    means for decoding the transmitted encoded data from each subscriber terminal; and

    means for directly connecting the transmitting means and the receiving means through the diplexers so that the encoded data is transmitted and received at the plurality of low band carrier frequencies without intervening amplification by the coaxial cable system repeaters.

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