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System for detecting failure in dual bus user network

  • US 5,379,307 A
  • Filed: 07/06/1992
  • Issued: 01/03/1995
  • Est. Priority Date: 07/05/1991
  • Status: Expired due to Term
First Claim
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1. A system for detecting failures in a user network which transmits and receives information in cell form, said system comprising:

  • network terminal means;

    dual bus means comprising a downbus and an upbus, both connected to said network terminal means, said dual bus means adapted for transmitting a cell comprising a header field and an information field, said header field being indicative of whether a data transmission request message or information has been stored in such cell, said information field being adapted to store data therein; and

    a plurality of terminals connected to said dual bus means, said terminals comprising data transmission processing means for issuing a data transmission request, downbus processing means for bringing said cell from said downbus for processing the cell in accordance with a desired process and returning said cell to said downbus, a timer, and failure detecting means for activating said timer for counting a given time interval in response to a data transmission request being issued from said data transmission processing means and for detecting a transmission failure when the transmission of the information registered in said information field of said cell is disallowed before said timer expires.

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