Multiplex communications – Data flow congestion prevention or control – Flow control of data transmission through a network
Patent
1994-01-28
1997-04-01
Chin, Wellington
Multiplex communications
Data flow congestion prevention or control
Flow control of data transmission through a network
H04J 314
Patent
active
056174098
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. 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. The flow control circuit further includes logic providing fair and efficient allocation of receive buffers across all virtual circuits between a transmitting node and a destination node. The flow control circuit ensures that during steady state operation, receive buffers in the receiving node, which are used to store data transmission units received from the transmitting node, are fairly divided among all active virtual circuits in the transmitting node.
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Murray, Jr. Hallam G.
Ozveren Cuneyt M.
Simcoe Robert J.
Waters Gregory M.
Chin Wellington
Dagg David A.
Digital Equipment Corporation
Vu Huy D.
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