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Upstream transmission using multiple transmission tags and downstream acknowledgements in conditional access packets

  • US 5,517,502 A
  • Filed: 03/02/1995
  • Issued: 05/14/1996
  • Est. Priority Date: 03/02/1995
  • Status: Expired due to Term
First Claim
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1. In a two-way communications network, a method of acknowledging an upstream data message transmitted from a subscriber terminal to a central facility comprising the steps of:

  • multiplexing a plurality of product and conditional access data packets to form a transport bitstream, said conditional access packets comprising a plurality of conditional access data bits and one or more upstream data message acknowledgment status bits;

    transmitting said transport bitstream in a downstream direction from said central facility to said terminal; and

    controlling a conditional access module and an upstream data transmission module in said terminal in response to said conditional access data bits and said upstream data message acknowledgment status bits respectively of said transmitted conditional access packets.

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