ZyXEL GS2200-8 User Guide - Page 76
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Chapter 8 Basic Setting Table 13 Basic Setting > Port Setup (continued) LABEL Speed/Duplex DESCRIPTION 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 (Gigabit connections only). Flow Control 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 autonegotiation 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 autonegotiation 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 autonegotiation 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. 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. 802.1p Priority PD 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. This priority value is added to incoming frames without a (802.1p) priority queue tag. See Priority Queue Assignment in Table 11 on page 71 for more information. Select this to provide power to a PD connected to the port. PD Priority If left unchecked, the PD connected to the port cannot receive power from the Switch. This field is only available on the model that supports PoE but not available for the Dual Personality Interfaces. When the total power requested by the PDs exceeds the total PoE power budget on the Switch, you can set the PD priority to allow the Switch to provide power to ports with higher priority. Select Critical to give the highest PD priority on the port. Select High to set the Switch to assign the remaining power to the port after all critical priority ports are served. Apply Cancel Select Low to set the Switch to assign the remaining power to the port after all critical and high priority ports are served. 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. Click Cancel to begin configuring this screen afresh. 8.8 PoE Status Note: The following screens are available for the GS2200-8HP or GS2200-24P model only. Some features are only available for the Ethernet ports (1 to 8 or 1 to 24). 76 GS2200-8/24 User's Guide