Programmable data packet buffer prioritization arrangement
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United States of America Patent
Stats
-
Aug 28, 1990
Grant Date -
N/A
app pub date -
Apr 19, 1989
filing date -
Apr 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a packet network, each data packet that is transported through the network to a destination node is assigned one of 2**N priority levels based on the type of information contained in the data packet. A data packet containing system control information is assigned the highest priority level. A data packet containing, for example, user information, is assigned a lower priority level. In addition, each priority level is associated with a respective 'watermark' threshold. When a data packet arrives at a network node, the node compares the packet's associated watermark threshold with the number of data words currently stored in a common memory. The node rejects the packet if the watermark threshold is found to be less than that number to reserve space in the memory for data packets of higher priority. Otherwise, the data packet is stored in the common memory.
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