Method for transmission of cyclic data
Patent 4998246 Issued on March 5, 1991. Estimated Expiration Date: 
July 31, 2009. 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.
July 31, 2009. 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 ReferencesTimed token ring Method of simultaneously transmitting isochronous and nonisochronous data on a local area network Token passing LAN using a plurality of tokens Method for communicating data on a communication network by token passing Loop transmission system and data transmission control method Distributed switching system Patent #: 4858232 InventorApplicationNo. 387159 filed on 07/31/1989US Classes:370/452On ring or loopExaminersPrimary: Olms, Douglas W.Assistant: Hsu, Alpus H. Attorney, Agent or FirmInternational ClassH04J 003/16Foreign Application Priority Data1988-08-05 JPAbstractA method for the transmission of cyclic data among stations in a looped transmission path which performs operations to bring the data in a shared cyclic memory up to date in a distribution control transmission system wherein a synchronous cyclic data transmission and an asynchronous event transmission are both included. In one aspect, the shortest token rotation time is first counted where synchronous cyclic data only are transmitted, and the timing of data transfer to a transmission buffer memory is thereafter selected to be such shortest token rotation time after the capture of a token by a station. In the second aspect, a dummy frame which cannot be received by any one of the stations in the loop is transmitted and synchronous data frames which have been queued in the transmission buffer memory are brought up to data by data in the cyclic memory during the transmission of the dummy frame. The transfer of synchronous data to the buffer memory is thus performed during the shortest token rotation time or during the dummy frame transmission time.Other References
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