Method of and system for implementing multiple levels of asynchronous priority in FDDI networks
Patent 5119374 Issued on June 2, 1992. Estimated Expiration Date: 
October 3, 2011. 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.
October 3, 2011. 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 with multiple priorities Timed token protocol for local area networks Industrialized token passing network Communication system with subdivided transmission cycles Network system using token-passing bus with multiple priority levels Patent #: 4930121 InventorsAssigneeApplicationNo. 769755 filed on 10/03/1991US Classes:370/455Including priority resolutionExaminersPrimary: Olms, Douglas W.Assistant: Kizou, H. Attorney, Agent or FirmInternational ClassesH04J 003/22H04J 003/02 AbstractThe standard FDDI priority algorithm is implemented by programming Token Holding Time (THT) threshold values for asynchronous service either in an increasing or decreasing order as a function of token holding time. If the thresholds are programmed in a decreasing order, all higher priority data is sent to the network before any lower priority data is sent. If the thresholds are programmed in an increasing order, highest priority data is sent first, until the unexpired token holding time falls below the threshold value for that priority; the next lower priority level data then is transmitted, and so on. Accordingly, at least some data of all priority assignments pending for transmission are sent to the medium during each token capture. | |
