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Asynchronous transfer mode communication system

  • US 5,452,296 A
  • Filed: 11/12/1993
  • Issued: 09/19/1995
  • Est. Priority Date: 11/12/1992
  • Status: Expired due to Fees
First Claim
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1. A communication system performing an asynchronous transfer mode (ATM) communication employing fixed length cells, comprising:

  • an ATM switching circuit having a plurality of input ports and a plurality of output ports and providing a virtual connection mutually connecting an input port and an output port;

    a routing control means for controlling said ATM switching circuit to form a virtual connection corresponding to a virtual connection identification and a destination address set in transmitting cells applied to the input port;

    a plurality of transmitting terminals for transmitting the cells respectively coupled to said input ports;

    a plurality of receiving terminals for receiving the cells from one of the transmitting terminals respectively coupled to said output ports;

    each of said transmitting terminals including;

    a vacant virtual connection table for storing virtual connections presently unused in said ATM switching circuit;

    retrieving means for retrieving an unused virtual connection from said vacant virtual connection table in response to a transmission demand for transmitting the cells from the transmitting terminal to one of the receiving terminals;

    and transmitting means for setting the retrieved virtual connection as said virtual connection identification of said transmitting cells in each transmitting cell, and setting the destination address and a calling party address for specifying the transmitting terminal in a leading cell of the transmitting cells;

    wherein said routing control means comprises;

    management table means, including a management table, for registering the virtual connection identification, the destination address and the calling party address set in the leading cell received at the input port in said management table;

    and controlling means for switching said ATM switching circuit to form the virtual connection corresponding to the virtual connection identification and destination address set in the leading cell.

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