ZyXEL Communications ZyXEL Dimension GS-2024 - Manual (Page 106)

Chapter 11 Bandwidth Control
GS-2024 User’s Guide
106
The following table describes the related labels in this screen.
Table 27 Advanced Application > Bandwidth Control
LABEL DESCRIPTION
Active Select this check box to enable bandwidth control on the Switch. You may temporarily
deactivate bandwidth control without deleting the rules configured by clearing this
check box.
Port This field displays the port 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 to activate bandwidth control on the port.
Ingress Rate Select the maximum bandwidth allowed in kilobits per second (Kbps) for the incoming
traffic flow on a port.
Scheme Select Drop from the drop-down list box to discard all incoming packets that are over
the maximum allowable bandwidth on a port.
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
this option to enable flow control.
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses
these changes if it is turned off or loses power, so use the Save link on the top
navigation panel to save your changes to the non-volatile memory when you are done
configuring.
Cancel Click Cancel to begin configuring this screen afresh.