ZyXEL Communications GS3700 Series User Manual page 61

The following table describes the labels in this screen.
Table 13 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 10/100/1000M for a 1000Base-T connection, 1000M for a 1000Base-X
connection, and 10G for a 10 Gigabit connection (available only on the Switch that has a 10
Gigabit interface).
Speed/Duplex Select the speed and the duplex mode of the Ethernet connection on this port. The choices
are Auto, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex 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 on the Switch that has a 10 Gigabit interface.
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.
802.1p Priority This priority value is added to incoming frames without a (802.1p) priority queue tag. See
Priority Queue Assignment in
Chapter 6 Basic Setting
Table 11 on page 56
GS3700/XGS3700 Series User's Guide
61
for more information.