Data packet flow control scheme for switching networks

Details Data packet flow control scheme for switching networks Data packet flow control scheme for switching networks

1982-02-16

1984-10-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, H04J 600

Patent

active

044751923

ABSTRACT:
Flow of data packets through virtual circuits in a multinode packet switching network is controlled by authorizing packets to enter and to leave each node. When a packet entering a node does not have an authorization (credit) to leave, it is placed in a pool of buffers common to all virtual circuits to await reception of an output credit for the virtual circuit. To avoid buffer congestion, a count is maintained of packets presently stored in and being processed through the node and packets that the node anticipates it will receive. If the count exceeds a predetermined threshold, a packet cannot get an authorization to enter the node unless it has a credit to leave. If the count is below the threshold, credits are granted for packets to enter the node even though there is no authorization to leave.

REFERENCES:
patent: 4074232 (1978-02-01), Otomo et al.
patent: 4079209 (1978-03-01), Schwerdtel
patent: 4380063 (1983-04-01), Janson et al.
"Analysis of Flow-Control In Switched Data Network By a Unified Model" by Pujolle, in Evolutions In Computer Communications, pp. 123-128, 1978.
"Methods, Tools & Observations On Flow Control In Packet-Switched Data Networks" by Pouzin, in IEEE Trans. On Communications, vol. Com-29, No. 4, Apr. 1981, pp. 413-426.

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