Flow control mechanism for block switching nodes
Patent 4380063 Issued on April 12, 1983. Estimated Expiration Date: 
June 10, 2001. 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.
June 10, 2001. 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 ReferencesApparatus and method for switching of data Patent #: 4032899 InventorsApplicationNo. 06/272143 filed on 06/10/1981US Classes:370/235, Flow control of data transmission through a network370/400, Having a plurality of nodes performing distributed switching370/450Passing a signal identifying the idle or busy state of a channel (e.g., token passing)ExaminersPrimary: Robinson, Mark A.Attorney, Agent or FirmInternational ClassH04L 12/56 (20060101)Foreign Application Priority Data1980-06-19 EPAbstractIn a communication network comprising block switching nodes interconnected by transmission links, a flow control mechanism is provided in each switching node for regulating the flow of addressed data blocks or messages. A hardware look-ahead mechanism effective within each node tests for each data block received from a link and buffered at an input port, whether it can be accepted at the appropriate output port of the same node for further transmission. A token mechanism effective over links permits maintenance at each output port of a node of an indication whether any data block can be accepted in the input port at the other end of the respective link. By the combined operation of look-ahead mechanisms and token mechanisms the flow of addressed messages in a direction where the transmission path is already filled up is prevented. This has a positive smoothing effect on overall traffic flow where short-time or local overloads occur.Other References
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