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Communication system and method

  • US 7,085,960 B2
  • Filed: 10/29/2002
  • Issued: 08/01/2006
  • Est. Priority Date: 10/30/2001
  • Status: Active Grant
First Claim
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1. A method of processing a data connection for exchanging data between two communication devices within a fault tolerant apparatus having an active host and a stand-by host;

  • the active host being arranged to support a communication protocol stack comprising at least a first protocol layer, providing connection management signals, for establishing and managing the data connection between the two communication devices, including a disconnect signal for terminating the data connection, and a second protocol layer having an associated connection context;

    the first protocol layer being at a higher level within the communication protocol stack relative to the second protocol layer;

    the method comprising;

    establishing a data connection between the two communication devices using at least the connection management signals of the first protocol layer and establishing a connection context for the second protocol layer;

    replicating the connection context of the second protocol layer to the stand-by host;

    implementing the communication stack protocol on the standby host in response to detection of an event associated with the active host;

    receiving, at the standby host, from one of the two communication devices, an associated connection management signal other than a disconnect signal; and

    issuing to at least one of the two communication devices a disconnect signal in response to receipt of the associated call management signal.

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