Allied Telesis AT-S26 - Manual (Page 70)

Configuring the Ports
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Backpressure enabled (half-duplex)
No backpressure
Backpressure applies only to ports operating in half-duplex mode.
Backpressure is useful when the port input buffer is running low on
memory resources. In the switch, outbound packets are traversing a
single uplink port. When a switch detects that a port input buffer is
nearly full, it simulates a collision so that the 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 sending
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.
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
any optional expansion modules).
Discard broadcast packets
Regular forwarding of broadcasts
With this option, you can decide whether the switch forwards
broadcast packets or not.
Port name
The port name field is used to assign a name to the port. Naming ports
can make it easier for you to identify the various ports. A name can
have up to 20 characters. An example is Sales - cube 223.
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