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CHANNEL-ALLOCATION SYSTEM FOR A CHANNEL-ADDRESSING MULTIPLE-ACCESS TELECOMMUNICATION SYSTEM

  • US 3,634,627 A
  • Filed: 07/21/1970
  • Issued: 01/11/1972
  • Est. Priority Date: 07/23/1969
  • Status: Expired due to Term
First Claim
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1. In a system for the selective establishment of two-way communication between a multiplicity of staTions over a lesser number of communication channels each adapted to carry supervisory signals along with message and address information between any two communicating stations, the improvement wherein each station comprises:

  • receiving means for retrieving address information, individual to the respective station, and supervisory signals from any channel connected thereto;

    scanning means for repetitively connecting said receiving means to each channel in succession for examining the busy/idle status of same;

    transmitting means synchronized with said receiving means for periodically gaining access to the channels concurrently examined by the latter;

    signal-generating means connected to said transmitting means for feeding either of two types of outgoing busy signals to a channel accessible thereto, said types of busy signals including a request signal and an engagement signal;

    monitoring means connected to said receiving means for ascertaining the availability of a channel under examination from the absence of corresponding types of incoming busy signals thereon, said monitoring means further being responsive to a locally generated readiness signal for arresting said scanning means and for actuating said signal-generating means to emit an outgoing request signal calling for a response from a remote station, thereby seizing such available channel;

    switch means controlled by said monitoring means upon detection of an incoming request signal originating from a remote station on a channel under examination for arresting said scanning means on said channel under examination and operating said signal-generating means to emit an outgoing engagement signal over the seized channel; and

    disconnect means controlled by said monitoring means for restarting said scanning means to release a seized channel upon nonreception of an incoming engagement signal from a remote station.

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