Communication network interface with screeners for incoming messages

  • US 5,400,331 A
  • Filed: 04/28/1993
  • Issued: 03/21/1995
  • Est. Priority Date: 04/28/1993
  • Status: Expired due to Term
First Claim
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1. A media access controller for a communication network that carries a message having at least one packet wherein each packet contains data and a tag indicating the data'"'"'s nature, said media access controller comprising:

  • a circuit for connection to the communication network in order to receive messages;

    a fixed screener coupled to said circuit and including a first memory that stores a first set of tag values for packets which carry station management data and commands, said fixed screener determines when the tag contained in said at least one packet of a message received from the network matches a member of the first set of tag values and produces a first signal when a match is found;

    an interface for receiving tag values from an external device;

    a general purpose screener coupled to said circuit and said interface and having a second memory that stores a second set of tag values which were received by said interface, a comparator which determines when the tag contained in said at least one packet of a message received from the network matches a member of the second set of tag values and produces a second signal when a match is found and a control circuit for writing a tag value received by said interface into the second memory;

    a third memory coupled to said circuit for storing the data contained in said at least one packet received from the network; and

    a router controller that receives the first and second signals and responds by erasing the data from said at least one packet stored in said third memory when neither the first signal nor the second signal indicates that a tag match was found.

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