Multi-media virtual circuit
Patent 4905231 Issued on February 27, 1990. Estimated Expiration Date: 
May 3, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 3, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesArrangement for routing data packets through a circuit switch Virtual PBX call processing method Patent #: 4764919 InventorsApplicationNo. 189851 filed on 05/03/1988US Classes:370/400Having a plurality of nodes performing distributed switchingExaminersPrimary: Safourek, Benedict V.Assistant: Chin, Wellington Attorney, Agent or FirmInternational ClassesH04Q 011/04H04J 003/24 AbstractA packet switch arrangement in which a first plurality of user devices is connected to a packet network by a first interface unit and a second plurality of user devices is connected to the packet network by a second interface unit. A virtual circuit is established between the interface units and control information is exchanged over the virtual circuit. The control information defines virtual channels on the virtual circuit and ones of the first and second pluralities of user devices which are to be sources and destinations for data in the defined virtual channels. Data from user devices is packetized and transmitted in the virtual channels by the interface units in accordance with the exchanged control information. Further, packets received in virtual channels on the virtual circuit are distributed to user devices by the interface units in accordance with exchanged control information.Other References
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