Multiplex communications – Wide area network – Packet switching
Patent
1993-07-26
1995-07-11
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 942, 370 79, H04L 1256, H04J 316
Patent
active
054327849
ABSTRACT:
A flow control system is disclosed, for a transmitting node and a receiving node. The transmitting node and the receiving node are linked together through multiple connections or virtual circuits. The receiving node includes a connection specific pool of buffers for receiving data transmission units from the transmitting node over each specific connection, and a common pool of buffers for storing data transmission units received from the transmitting node over any of the connections between the transmitting node and the receiving node. A flow control circuit in the transmitting node limits the number of data transmission units transmitted from the transmitting station, and not yet copied out of the receive buffers in the receiving node, to the total number of receive buffers in the receiving node. The flow control circuit in the transmitting node further controls the transmission of data transmission units on the multiple connections fairly, such that all connections are provided a proportional amount of the total available receive buffers in the receiving node. In an example embodiment, a global counter is used to maintain the total number of receive buffers containing data in the receiving node, and a global limit register contains the maximum number of receive buffers containing data in the receiving node allowed for a single connection.
REFERENCES:
patent: 5199027 (1993-03-01), Barri
patent: 5285446 (1994-02-01), Yonehara
patent: 5289462 (1994-02-01), Ahmadi
"Autonet: A High-Speed, Self-Configuring Local Area Network Using Point to Point Links", by Michael Shroeder, Andrew D. Birrell, Michael Burrows, Hal Murray, Roger M. Needham, Thomas L. Rodeheffer, Edwin H. Satterwaite, and Charles P. Thacker, published in IEEE Journal on Selected Areas in Communications, vol. 9, No. 8, Oct. 1991.
"The FCVC (Flow Controlled Virtual Channels) Proposal for ATM Neworks (DRAFT)", By H. T. Kung and Alan Chapman, posted on the Internet for comments Jun. 21, 1993.
Chin Wellington
Dagg David A.
Digital Equipment Corporation
Johnston A. Sidney
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