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Arrangement for changing the destination of single link, single destination data messages

  • US 6,532,231 B1
  • Filed: 01/14/1999
  • Issued: 03/11/2003
  • Est. Priority Date: 08/29/1998
  • Status: Expired due to Term
First Claim
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1. In a system comprising a controlling unit and at least two controlled units, said controlling and controlled units being interconnected by data links operating under a single destination protocol, a method of switching transmission of data messages from a first of said controlled units to a second of said controlled units comprising the steps of:

  • responsive to detection of a request to switch transmission of messages from said first of said controlled units to said second of said controlled uints, queuing subsequently received client messages in a queue in said controlling unit;

    transmitting drain request messages to said first controlled unit;

    responsive to receipt of drain message acknowledgments, transmitting a switch command to said first controlled unit;

    said controlling unit responsive to said switch command, disconnecting itself from one of said data links;

    responsive to receipt of said switch command, copying dynamic data from said first controlled unit to said second controlled unit;

    said second controlled unit connecting itself to another one of said data links;

    said second controlled unit transmitting a switch complete message to said controlling unit; and

    said controlling unit transmitting accumulated and new client messages to said second controlled unit over said another one of said data links.

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