Data packet flow control scheme for switching networks
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United States of America Patent
Stats
-
Oct 2, 1984
Grant Date -
N/A
app pub date -
Feb 16, 1982
filing date -
Feb 16, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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