
Dimension ES-4024 Ethernet Switch
Basic Setting
Table 6-7 Basic Setting: Port Setup
LABEL DESCRIPTION
Type This field displays 10/100M for an Ethernet/Fast Ethernet connection and 1000M for the uplink
ports.
Speed/Duplex Select the speed and the duplex mode of the Ethernet connection on this port. Choices are Auto,
10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full Duplex and 1000M/Full
Duplex (for gigabit ports only).
Selecting Auto (auto-negotiation) allows one Ethernet port to negotiate with a peer automatically to
obtain the connection speed and duplex mode that both ends support. When auto-negotiation is
turned on, an Ethernet port on the switch negotiates with the peer automatically to determine the
connection speed and duplex mode. If the peer Ethernet port does not support auto-negotiation or
turns off this feature, the switch determines the connection speed by detecting the signal on the
cable and using half duplex mode. When the switch’s auto-negotiation is turned off, an Ethernet port
uses the pre-configured speed and duplex mode when making a connection, thus requiring you to
make sure that the settings of the peer Ethernet port are the same in order to connect.
Flow Control A concentration of traffic on a port decreases port bandwidth and overflows 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 ES-4024 uses IEEE802.3x flow control in full duplex mode and backpressure flow control in half
duplex mode.
IEEE802.3x flow 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 fill.
Back Pressure flow 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. Select Flow Control to enable it.
802.1P
Priority
This priority value is added to incoming frames without a (802.1p) priority queue tag. See Priority
Queue Assignment in Table 6-3 for more information.
Apply Click Apply to save the settings.
Cancel Click Cancel to reset the fields to your previous configuration.
6-12
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