Operation Manual

27
Flow Control:
Aconcentrationoftrafconaportdecreasesport
bandwidth and overows buffer memory causing
packet discards and frame losses. Flow Control is
used to regulate transmission of signals to match
the bandwidth of the receiving port. The Switch
uses IEEE802.3x ow control in full duplex mode
andbackpressureowcontrolinhalfduplexmode.
IEEE802.3xowcontrolisusedinfullduplexmode
to send a pause signal to the sending port, causing
it to temporarily stop sending signals when the
receivingportmemorybuffersll.
BackPressureowcontrolistypicallyusedinhalf
duplex mode to send a “collision” signal to the
sending port (mimicking a state of packet collision)
causing the sending port to temporarily stop sending
signals and resend later.
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