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Duplicating digital streams for digital conferencing using switching technologies

  • US 7,921,157 B2
  • Filed: 10/16/2006
  • Issued: 04/05/2011
  • Est. Priority Date: 04/30/2001
  • Status: Active Grant
First Claim
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1. A method of transmitting data units to participants of a conference using a switch, the method comprising:

  • receiving, at the switch, a first data unit from a first conferencing participant, the first data unit addressed to the switch and including a payload portion;

    forwarding, by the switch, the first data unit to at least a second conferencing participant and a third conferencing participant by;

    generating a first and a second duplicated data unit by duplicating at least a portion of the payload portion of the first data unit and adding header information to reflect destination address information,wherein duplicating at least a portion of the payload portion of the second data unit includes;

    identifying a portion of the payload portion that is not suitable for the third conferencing participant;

    filtering the payload portion of the second data unit by removing the portion that is not suitable for the third conferencing participant;

    duplicating a remaining portion of the payload portion of the second data unit for transmission to the third conferencing participant;

    transmitting the first duplicated data unit to the second conferencing participant and transmitting the second duplicated data unit to the third conferencing participant;

    receiving, at the switch, a second data unit from the second conferencing participant; and

    forwarding, by the switch, the second data unit to at least the first conferencing participant and the third conferencing participant.

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