ZyXEL Communications GS1200 SERIES User Manual page 24

Table 4 System (continued)
LABEL DESCRIPTION
Port This identifies the Ethernet port on the Switch.
Link This field displays the current status or speed (either 10Mbps, 100Mbps or 1000Mbps) of
each port.
TX This field shows the number of transmitted frames on this port.
RX This field shows the number of received frames on this port.
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 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 the check box to enable it.
Loop Status This field is available only on the GS1200-8HP.
It displays Loop when the Switch detects a loop on the port. Otherwise, it displays Normal.
Loop Unlock This field is available only on the GS1200-8HP. It is configurable when you enable loop
detection in the Storm Control screen and the port is shut down to break a loop.
Select this option and click Apply to enable the port.
Refresh Click this button to update the information in this screen.
Clear Counters Click this button to return the screen to its last-saved settings.
Apply Click this button to save your changes to the Switch.
Chapter 6 System
GS1200 Series User's Guide
24