ZyXEL Communications XGS4700 Series, Manual

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Chapter 8 Basic Setting
XGS4700-48F User’s Guide
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The following table describes the labels in this screen.
Table 14 Basic Setting > Port Setup
LABEL DESCRIPTION
Port This is the port index number.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports.
Use this row first to set the common settings and then make adjustments
on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you
make them.
Active Select this check box to enable a port. The factory default for all ports is
enabled. A port must be enabled for data transmission to occur.
Name Type a descriptive name that identifies this port. You can enter up to 64
alpha-numerical characters.
Note: Due to space limitations, the port name may be truncated in
some web configurator screens.
Type This field displays 100/1000M for a 1000Base-T connection, and 10G for
a 10 Gigabit Ethernet connection.
Speed/
Duplex Select the speed and the duplex mode of the Ethernet connection on this
port. The choices are Auto, and 100M/Full Duplex for a 100Base-T
connection. 1000M/Full Duplex is supported by both 1000Base-T and
1000Base-X connections. 10G/Full Duplex is supported by the 10 Gigabit
Ethernet connections.
Selecting Auto (auto-negotiation) allows one port to negotiate with a peer
port automatically to obtain the connection speed and duplex mode that
both ends support. When auto-negotiation is turned on, a port on the
Switch negotiates with the peer automatically to determine the connection
speed and duplex mode. If the peer 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, a 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 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 Switch uses IEEE 802.3x flow control in full duplex mode and
backpressure flow control in half duplex mode.
IEEE 802.3x 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.