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ATM communication system having a physical loop form with logical start point and end point

  • US 5,604,729 A
  • Filed: 09/29/1994
  • Issued: 02/18/1997
  • Est. Priority Date: 04/19/1993
  • Status: Expired due to Fees
First Claim
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1. An ATM communication system comprising:

  • a plurality of communication nodes connected in a physical loop form by two transmission means having opposite cell transmission directions relative to each other, each of said two transmission means has a logical start point and an end point;

    buffer means disposed in each communication node to transmit and receive a cell, said buffer means being connected to said two transmission means;

    synchronizing pulse generating means connected to said each communication node to generate a timing pulse for reading out a cell from said buffer means;

    cell multiplexing means disposed in said each communication node to multiplexing a cell to said two transmission means, said cell multiplexing means having an input port and an output port which is connected to said two transmission means;

    cell transmitting means disposed in said each communication node to transmit a cell from an input line to said cell multiplexing means, said cell transmitting means being connected to said cell multiplexing means;

    cell receiving means disposed in said each communication node to receive a cell from said two transmission means and to supply said cell to an output line, said cell receiving means being connected to said cell multiplexing means at said output port;

    first storage means disposed in said each communication node to store information identifying said each communication node connected by said transmission means;

    second storage means disposed in said each communication node to store information identifying a communication node functioning as a logical start point of a physical loop; and

    direction selecting means disposed in said each communication node to select a cell transmission direction from said opposite cell transmission directions based on said information stored in said first and second storage means.

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