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Cable television network with upstream channel specialized for sending upstream information signals

  • US 5,794,117 A
  • Filed: 03/14/1996
  • Issued: 08/11/1998
  • Est. Priority Date: 03/15/1995
  • Status: Expired due to Fees
First Claim
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1. Process for transmitting upstream messages in a cable television network which comprises a specific tree-like path for sending messages upstream, which path comprises a plurality of branches called upstream branches, each formed by an optical fibre, which process is characterized in that, in a junction between an upstream branch and various downstream branches, which comprises a transmitter including a converter for producing a light signal transmitted up the upstream branch from a message sequence in the form of an electric signal and, for each downstream branch, a receiver which includes a converter which produces a message in the form of an electric signal from a light signal coming from the downstream branch,a message received from downstream and carrying a recognition code is recorded in a receiving memory,based on messages received by the receivers and a message, called local message, generated in the junction itself to be transmitted up the upstream branch, a send message sequence is determined which comprises first messages which repeat in a delayed version the messages received by the receivers and, in the end, the local message whose presence indicates that the sequence has ended,the same sequence is repeated indefinitely while the contents of the message are being updated, as required.

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