Allied Telesis AT-S25 - Manual (Page 68)

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If the port is on an AT-8324 switch and you select the full-duplex
or half-duplex setting rather than the default setting of auto-
negotiate, prompts are displayed for the port speed, as shown in
Figure 24. The port speed on an AT-8324 switch can be 10 Mbps
or 100 Mbps. (The 100 Mpbs port speed on an AT-8316F Series
switch cannot be changed.)
Figure 24 Port Speed Setting for an AT-8324 Switch
Backpressure enabled (half-duplex)
No backpressure
Backpressure applies only to ports operating in half-duplex mode.
Backpressure is useful when a port’s input buffer is running low on
memory resources. In the switch, outbound are packets traversing
a single uplink port. When a switch detects that a port’s input
buffer is nearly full, it simulates a collision so that sending node
will defer transmission. The sending node will retry transmissions
according to the Ethernet back-off algorithm. Once switch
resources are available again, the switch stops sending the
collision signal and the nodes can freely transmit packets.
Flow control (full-duplex)
No flow control
Flow control applies only to ports operating in full-duplex mode.
It works for full duplex ports the same way as backpressure does
for half-duplex ports except that the switch uses a special pause
packet instead of a jam signal. The pause packet notifies the other
node to stop transmitting for a specified period of time.
Discard broadcast packets
Regular forwarding of broadcasts
Use these two options to have the port either forward broadcast
packets or discard them. The default is to forward broadcast
packets
Global configuration
This option saves you from having to enter the same
configurations on every port. If you select this option, any settings
you entered on a port are copied to all the station ports on the
switch (but not ports on optional expansion modules).