Flow control method and apparatus for ethernet packet switched hub
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United States of America Patent
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-
Jan 12, 1999
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 7, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A flow control enabled Ethernet switch that applies backpressure to input ports that attempt to transmit a data packet to a busy destination port. The backpressure is a phantom packet that activates the IEEE 802.3 collision detection system to abort transmission of the data packet. A subsequent series of phantom packets (that are invalid) provide carrier activity that inhibits retransmission of the packet. When the destination port is available, the phantom packets are stopped, permitting standard retransmission of the data packet. The switch includes prioritization mechanisms (e.g., a throttle count) to use when awarding priority to a port having backpressure applied.
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